400 files changed, 42414 insertions, 13375 deletions
diff --git a/.github/ISSUE_TEMPLATE/bug_report.md b/.github/ISSUE_TEMPLATE/bug_report.md
index dddc82f80..b5160eaa3 100644
--- a/.github/ISSUE_TEMPLATE/bug_report.md
+++ b/.github/ISSUE_TEMPLATE/bug_report.md
@@ -13,12 +13,9 @@ Forum for questions: https://users.rust-lang.org/c/ide/14
 Before submitting, please make sure that you're not running into one of these known issues:
- 1. local imports (`use` statements) don't work: #1165
+ 1. on-the-fly diagnostics are mostly unimplemented (`cargo check` diagnostics will be shown when saving a file)
- 2. local items don't work: #1559
+ 2. some settings are required for procedural macro and build script support (`rust-analyzer.cargo.loadOutDirsFromCheck`, `rust-analyzer.procMacro.enable`): #6448
- 3. on-the-fly diagnostics are mostly unimplemented (`cargo check` diagnostics will be shown when saving a file)
+ 3. some platform-specific imports are not resolved: #6038
- 4. some settings are required for procedural macro and build script support (`rust-analyzer.cargo.loadOutDirsFromCheck`, `rust-analyzer.procMacro.enable`): #6448
- 5. some platform-specific imports are not resolved: #6038
- 6. the official `rust-lang.rust` VS Code extension conflicts with `rust-analyzer`: #6463
 Otherwise please try to provide information which will help us to fix the issue faster. Minimal reproducible examples with few dependencies are especially lovely <3.
 -->
diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index a97ed24ba..32c7cf7ef 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -94,6 +94,7 @@ jobs:
        toolchain: stable
        profile: minimal
        override: true
+        components: rust-src
    - name: Install Nodejs
      uses: actions/setup-node@v1
@@ -108,16 +109,46 @@ jobs:
      if: github.ref != 'refs/heads/release'
      run: cargo xtask dist --nightly --client 0.3.$GITHUB_RUN_NUMBER-nightly
-    - name: Nightly analysis-stats check
+    - name: Run analysis-stats on rust-analyzer
-      if: github.ref != 'refs/heads/release'
      run: target/${{ env.RA_TARGET }}/release/rust-analyzer analysis-stats .
+    - name: Run analysis-stats on rust std library
+      run: target/${{ env.RA_TARGET }}/release/rust-analyzer analysis-stats --with-deps $(rustc --print sysroot)/lib/rustlib/src/rust/library/std
    - name: Upload artifacts
      uses: actions/upload-artifact@v1
      with:
        name: dist-x86_64-unknown-linux-gnu
        path: ./dist
+  dist-x86_64-unknown-linux-musl:
+    name: dist (x86_64-unknown-linux-musl)
+    runs-on: ubuntu-20.04
+    env:
+      RA_TARGET: x86_64-unknown-linux-musl
+      # For some reason `-crt-static` is not working for clang without lld
+      RUSTFLAGS: "-C link-arg=-fuse-ld=lld -C target-feature=-crt-static"
+    container:
+      image: rust:alpine
+      volumes:
+      - /usr/local/cargo/registry
+    steps:
+    - name: Install dependencies
+      run: apk add --no-cache git clang lld musl-dev
+    - name: Checkout repository
+      uses: actions/checkout@v2
+    - name: Dist
+      run: cargo xtask dist
+    - name: Upload artifacts
+      uses: actions/upload-artifact@v1
+      with:
+        name: dist-x86_64-unknown-linux-musl
+        path: ./dist
  dist-aarch64-unknown-linux-gnu:
    name: dist (aarch64-unknown-linux-gnu)
    runs-on: ubuntu-16.04
@@ -154,8 +185,12 @@ jobs:
    runs-on: macos-latest
    env:
      RA_TARGET: x86_64-apple-darwin
+      SELECT_XCODE: /Applications/Xcode_12.2.app
    steps:
+    - name: Select XCode version
+      run: sudo xcode-select -s "${SELECT_XCODE}"
    - name: Checkout repository
      uses: actions/checkout@v2
@@ -180,8 +215,12 @@ jobs:
    runs-on: macos-latest
    env:
      RA_TARGET: aarch64-apple-darwin
+      SELECT_XCODE: /Applications/Xcode_12.2.app
    steps:
+    - name: Select XCode version
+      run: sudo xcode-select -s "${SELECT_XCODE}"
    - name: Checkout repository
      uses: actions/checkout@v2
@@ -205,7 +244,7 @@ jobs:
  publish:
    name: publish
    runs-on: ubuntu-16.04
-    needs: ['dist-x86_64-pc-windows-msvc', 'dist-aarch64-pc-windows-msvc', 'dist-x86_64-unknown-linux-gnu', 'dist-aarch64-unknown-linux-gnu', 'dist-x86_64-apple-darwin', 'dist-aarch64-apple-darwin']
+    needs: ['dist-x86_64-pc-windows-msvc', 'dist-aarch64-pc-windows-msvc', 'dist-x86_64-unknown-linux-gnu', 'dist-x86_64-unknown-linux-musl', 'dist-aarch64-unknown-linux-gnu', 'dist-x86_64-apple-darwin', 'dist-aarch64-apple-darwin']
    steps:
    - name: Install Nodejs
      uses: actions/setup-node@v1
@@ -238,6 +277,10 @@ jobs:
        path: dist
    - uses: actions/download-artifact@v1
      with:
+        name: dist-x86_64-unknown-linux-musl
+        path: dist
+    - uses: actions/download-artifact@v1
+      with:
        name: dist-aarch64-unknown-linux-gnu
        path: dist
    - uses: actions/download-artifact@v1
diff --git a/.vscode/launch.json b/.vscode/launch.json
index 8ca27d878..021b8f048 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -120,6 +120,12 @@
      "sourceMaps": true,
      "outFiles": [ "${workspaceFolder}/editors/code/out/tests/unit/**/*.js" ],
      "preLaunchTask": "Pretest"
+    },
+    {
+      "name": "Win Attach to Server",
+      "type": "cppvsdbg",
+      "processId":"${command:pickProcess}",
+      "request": "attach"
    }
  ]
 }
diff --git a/Cargo.lock b/Cargo.lock
index d6af5e563..ec5aecfa0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,5 +1,7 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
 [[package]]
 name = "addr2line"
 version = "0.14.1"
@@ -11,9 +13,18 @@ dependencies = [
 [[package]]
 name = "adler"
-version = "0.2.3"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+[[package]]
+name = "always-assert"
+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ee2a4ec343196209d6594e19543ae87a39f96d5534d7174822a3ad825dd6ed7e"
+checksum = "fbf688625d06217d5b1bb0ea9d9c44a1635fd0ee3534466388d18203174f4d11"
+dependencies = [
+ "log",
+]
 [[package]]
 name = "ansi_term"
@@ -21,14 +32,14 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d52a9bb7ec0cf484c551830a7ce27bd20d67eac647e1befb56b0be4ee39a55d2"
 dependencies = [
- "winapi 0.3.9",
+ "winapi",
 ]
 [[package]]
 name = "anyhow"
-version = "1.0.37"
+version = "1.0.38"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ee67c11feeac938fae061b232e38e0b6d94f97a9df10e6271319325ac4c56a86"
+checksum = "afddf7f520a80dbf76e6f50a35bca42a2331ef227a28b3b6dc5c2e2338d114b1"
 [[package]]
 name = "anymap"
@@ -43,22 +54,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "23b62fc65de8e4e7f52534fb52b0f3ed04746ae267519eef2a83941e8085068b"
 [[package]]
-name = "assists"
-version = "0.0.0"
-dependencies = [
- "either",
- "hir",
- "ide_db",
- "itertools 0.10.0",
- "profile",
- "rustc-hash",
- "stdx",
- "syntax",
- "test_utils",
- "text_edit",
-]
-[[package]]
 name = "atty"
 version = "0.2.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -66,7 +61,7 @@ checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
 dependencies = [
 "hermit-abi",
 "libc",
- "winapi 0.3.9",
+ "winapi",
 ]
 [[package]]
@@ -77,25 +72,19 @@ checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
 [[package]]
 name = "backtrace"
-version = "0.3.55"
+version = "0.3.56"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ef5140344c85b01f9bbb4d4b7288a8aa4b3287ccef913a14bcc78a1063623598"
+checksum = "9d117600f438b1707d4e4ae15d3595657288f8235a0eb593e80ecc98ab34e1bc"
 dependencies = [
 "addr2line",
- "cfg-if 1.0.0",
+ "cfg-if",
 "libc",
 "miniz_oxide",
- "object 0.22.0",
+ "object",
 "rustc-demangle",
 ]
 [[package]]
-name = "base64"
-version = "0.12.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3441f0f7b02788e948e47f457ca01f1d7e6d92c693bc132c22b087d3141c03ff"
-[[package]]
 name = "base_db"
 version = "0.0.0"
 dependencies = [
@@ -118,9 +107,18 @@ checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
 [[package]]
 name = "byteorder"
-version = "1.3.4"
+version = "1.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae44d1a3d5a19df61dd0c8beb138458ac2a53a7ac09eba97d55592540004306b"
+[[package]]
+name = "camino"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "08c48aae112d48ed9f069b33538ea9e3e90aa263cfa3d1c24309612b1f7472de"
+checksum = "9bb47ab72bdba43021afa16dc1ef4d80c980d366b17ed37ea8d2ebe2087075b9"
+dependencies = [
+ "serde",
+]
 [[package]]
 name = "cargo-platform"
@@ -133,10 +131,11 @@ dependencies = [
 [[package]]
 name = "cargo_metadata"
-version = "0.12.2"
+version = "0.13.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "11a47b6286279a9998588ef7050d1ebc2500c69892a557c90fe5d071c64415dc"
+checksum = "081e3f0755c1f380c2d010481b6fa2e02973586d5f2b24eebb7a2a1d98b143d8"
 dependencies = [
+ "camino",
 "cargo-platform",
 "semver",
 "semver-parser",
@@ -146,9 +145,9 @@ dependencies = [
 [[package]]
 name = "cc"
-version = "1.0.66"
+version = "1.0.67"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4c0496836a84f8d0495758516b8621a622beb77c0fed418570e50764093ced48"
+checksum = "e3c69b077ad434294d3ce9f1f6143a2a4b89a8a2d54ef813d85003a4fd1137fd"
 [[package]]
 name = "cfg"
@@ -163,21 +162,15 @@ dependencies = [
 [[package]]
 name = "cfg-if"
-version = "0.1.10"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
-[[package]]
-name = "cfg-if"
 version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 [[package]]
 name = "chalk-derive"
-version = "0.47.0"
+version = "0.59.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3f00f6342a387edc822002d36a381e117afcac9f744951ff75fbf4a218edea5c"
+checksum = "4b9000fbcb67353dc8973ab9fd136277d321d85b79bd36b8756bb3ae0979a94a"
 dependencies = [
 "proc-macro2",
 "quote",
@@ -187,9 +180,9 @@ dependencies = [
 [[package]]
 name = "chalk-ir"
-version = "0.47.0"
+version = "0.59.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c686e69913591ae753e5526e73cbee39db3d9b0a92cc9078ab780cabf1c70aa9"
+checksum = "b23528d61b3557c676eccf508fa0771a38453b379f0b780154eaa7f70afe8dfc"
 dependencies = [
 "bitflags",
 "chalk-derive",
@@ -198,9 +191,9 @@ dependencies = [
 [[package]]
 name = "chalk-recursive"
-version = "0.47.0"
+version = "0.59.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "310fdcac0340dab4163b766baa8067266e3b909108d1ac1b5246c033bde63975"
+checksum = "a8bdd37afc666b771de8b4429fe014363d0e74aae5cc26f320f60a3eab34d744"
 dependencies = [
 "chalk-derive",
 "chalk-ir",
@@ -211,14 +204,14 @@ dependencies = [
 [[package]]
 name = "chalk-solve"
-version = "0.47.0"
+version = "0.59.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c3c3252116111c3548f1164ab8d98c67c49848b3bde10dd11b650fd023e91c72"
+checksum = "4182c42ca319cb71c89898ebc3d2671d1fa7d928123b171b66f1797a2000b9c8"
 dependencies = [
 "chalk-derive",
 "chalk-ir",
 "ena",
- "itertools 0.9.0",
+ "itertools",
 "petgraph",
 "rustc-hash",
 "tracing",
@@ -235,8 +228,7 @@ dependencies = [
 "libc",
 "num-integer",
 "num-traits",
- "time",
+ "winapi",
- "winapi 0.3.9",
 ]
 [[package]]
@@ -249,47 +241,23 @@ dependencies = [
 ]
 [[package]]
-name = "completion"
+name = "countme"
-version = "0.0.0"
+version = "2.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "328b822bdcba4d4e402be8d9adb6eebf269f969f8eadef977a553ff3c4fbcb58"
 dependencies = [
- "base_db",
+ "dashmap",
- "either",
+ "once_cell",
- "expect-test",
- "hir",
- "ide_db",
- "itertools 0.10.0",
- "log",
- "profile",
 "rustc-hash",
- "stdx",
- "syntax",
- "test_utils",
- "text_edit",
 ]
 [[package]]
-name = "const_fn"
-version = "0.4.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cd51eab21ab4fd6a3bf889e2d0958c0a6e3a61ad04260325e919e652a2a62826"
-[[package]]
 name = "crc32fast"
 version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "81156fece84ab6a9f2afdb109ce3ae577e42b1228441eded99bd77f627953b1a"
 dependencies = [
- "cfg-if 1.0.0",
+ "cfg-if",
-]
-[[package]]
-name = "crossbeam-channel"
-version = "0.4.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b153fe7cbef478c567df0f972e02e6d736db11affe43dfc9c56a9374d1adfb87"
-dependencies = [
- "crossbeam-utils 0.7.2",
- "maybe-uninit",
 ]
 [[package]]
@@ -298,8 +266,8 @@ version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dca26ee1f8d361640700bde38b2c37d8c22b3ce2d360e1fc1c74ea4b0aa7d775"
 dependencies = [
- "cfg-if 1.0.0",
+ "cfg-if",
- "crossbeam-utils 0.8.1",
+ "crossbeam-utils",
 ]
 [[package]]
@@ -308,45 +276,43 @@ version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "94af6efb46fef72616855b036a624cf27ba656ffc9be1b9a3c931cfc7749a9a9"
 dependencies = [
- "cfg-if 1.0.0",
+ "cfg-if",
 "crossbeam-epoch",
- "crossbeam-utils 0.8.1",
+ "crossbeam-utils",
 ]
 [[package]]
 name = "crossbeam-epoch"
-version = "0.9.1"
+version = "0.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a1aaa739f95311c2c7887a76863f500026092fb1dce0161dab577e559ef3569d"
+checksum = "2584f639eb95fea8c798496315b297cf81b9b58b6d30ab066a75455333cf4b12"
 dependencies = [
- "cfg-if 1.0.0",
+ "cfg-if",
- "const_fn",
+ "crossbeam-utils",
- "crossbeam-utils 0.8.1",
 "lazy_static",
- "memoffset 0.6.1",
+ "memoffset",
 "scopeguard",
 ]
 [[package]]
 name = "crossbeam-utils"
-version = "0.7.2"
+version = "0.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c3c7c73a2d1e9fc0886a08b93e98eb643461230d5f1925e4036204d5f2e261a8"
+checksum = "e7e9d99fa91428effe99c5c6d4634cdeba32b8cf784fc428a2a687f61a952c49"
 dependencies = [
 "autocfg",
- "cfg-if 0.1.10",
+ "cfg-if",
 "lazy_static",
 ]
 [[package]]
-name = "crossbeam-utils"
+name = "dashmap"
-version = "0.8.1"
+version = "4.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "02d96d1e189ef58269ebe5b97953da3274d83a93af647c2ddd6f9dab28cedb8d"
+checksum = "e77a43b28d0668df09411cb0bc9a8c2adc40f9a048afe863e05fd43251e8e39c"
 dependencies = [
- "autocfg",
+ "cfg-if",
- "cfg-if 1.0.0",
+ "num_cpus",
- "lazy_static",
 ]
 [[package]]
@@ -378,9 +344,9 @@ dependencies = [
 [[package]]
 name = "env_logger"
-version = "0.8.2"
+version = "0.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f26ecb66b4bdca6c1409b40fb255eefc2bd4f6d135dab3c3124f80ffa2a9661e"
+checksum = "17392a012ea30ef05a610aa97dfb49496e71c9f676b27879922ea5bdf60d9d3f"
 dependencies = [
 "log",
 ]
@@ -397,14 +363,14 @@ dependencies = [
 [[package]]
 name = "filetime"
-version = "0.2.13"
+version = "0.2.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c122a393ea57648015bf06fbd3d372378992e86b9ff5a7a497b076a28c79efe"
+checksum = "1d34cfa13a63ae058bfa601fe9e313bbdb3746427c1459185464ce0fcf62e1e8"
 dependencies = [
- "cfg-if 1.0.0",
+ "cfg-if",
 "libc",
 "redox_syscall",
- "winapi 0.3.9",
+ "winapi",
 ]
 [[package]]
@@ -415,11 +381,11 @@ checksum = "37ab347416e802de484e4d03c7316c48f1ecb56574dfd4a46a80f173ce1de04d"
 [[package]]
 name = "flate2"
-version = "1.0.19"
+version = "1.0.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7411863d55df97a419aa64cb4d2f167103ea9d767e2c54a1868b7ac3f6b47129"
+checksum = "cd3aec53de10fe96d7d8c565eb17f2c687bb5518a2ec453b5b1252964526abe0"
 dependencies = [
- "cfg-if 1.0.0",
+ "cfg-if",
 "crc32fast",
 "libc",
 "miniz_oxide",
@@ -430,7 +396,7 @@ name = "flycheck"
 version = "0.0.0"
 dependencies = [
 "cargo_metadata",
- "crossbeam-channel 0.5.0",
+ "crossbeam-channel",
 "jod-thread",
 "log",
 "serde_json",
@@ -440,15 +406,21 @@ dependencies = [
 [[package]]
 name = "form_urlencoded"
-version = "1.0.0"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ece68d15c92e84fa4f19d3780f1294e5ca82a78a6d515f1efaabcc144688be00"
+checksum = "5fc25a87fa4fd2094bffb06925852034d90a17f0d1e05197d4956d3555752191"
 dependencies = [
 "matches",
 "percent-encoding",
 ]
 [[package]]
+name = "fs_extra"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2022715d62ab30faffd124d40b76f4134a550a87792276512b18d63272333394"
+[[package]]
 name = "fsevent"
 version = "2.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -474,22 +446,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d79238883cf0307100b90aba4a755d8051a3182305dfe7f649a1e9dc0517006f"
 [[package]]
-name = "fuchsia-zircon"
-version = "0.3.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2e9763c69ebaae630ba35f74888db465e49e259ba1bc0eda7d06f4a067615d82"
-dependencies = [
- "bitflags",
- "fuchsia-zircon-sys",
-]
-[[package]]
-name = "fuchsia-zircon-sys"
-version = "0.3.3"
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 "hir_expand",
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+ "itertools",
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@@ -557,7 +507,7 @@ dependencies = [
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 "hir_expand",
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- "itertools 0.10.0",
+ "itertools",
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 "hir_def",
 "hir_expand",
- "itertools 0.10.0",
+ "itertools",
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 "rustc-hash",
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+ "ide_db",
+ "itertools",
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+ "syntax",
+ "test_utils",
+ "text_edit",
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 "hir",
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+ "itertools",
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 [[package]]
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+ "cfg-if",
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+ "either",
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+ "libc",
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+ "cfg-if",
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+ "crossbeam-channel",
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 "serde",
 "serde_json",
@@ -846,11 +844,10 @@ dependencies = [
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 dependencies = [
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 "parser",
+ "profile",
 "rustc-hash",
 "smallvec",
+ "stdx",
 "syntax",
 "test_utils",
 "tt",
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- "fuchsia-zircon-sys",
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 "libc",
 "log",
 "miow",
- "net2",
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 dependencies = [
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 "fsevent",
 "fsevent-sys",
 "inotify",
 "libc",
 "mio",
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 "walkdir",
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+ "cfg-if",
 "instant",
 "libc",
 "redox_syscall",
 "smallvec",
- "winapi 0.3.9",
+ "winapi",
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+ "proc-macro-hack",
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@@ -1153,16 +1126,16 @@ dependencies = [
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+checksum = "dbf0c48bc1d91375ae5c3cd81e3722dff1abcf81a30960240640d223f59fe0e5"
 [[package]]
 name = "proc-macro2"
@@ -1178,11 +1151,12 @@ name = "proc_macro_api"
 version = "0.0.0"
 dependencies = [
 "base_db",
- "crossbeam-channel 0.5.0",
+ "crossbeam-channel",
 "jod-thread",
 "log",
 "serde",
 "serde_json",
+ "stdx",
 "tt",
 ]
@@ -1193,8 +1167,8 @@ dependencies = [
 "cargo_metadata",
 "libloading",
 "mbe",
- "memmap",
+ "memmap2",
- "object 0.23.0",
+ "object",
 "proc_macro_api",
 "proc_macro_test",
 "serde_derive",
@@ -1211,7 +1185,9 @@ version = "0.0.0"
 name = "profile"
 version = "0.0.0"
 dependencies = [
- "cfg-if 1.0.0",
+ "cfg-if",
+ "countme",
+ "jemalloc-ctl",
 "la-arena",
 "libc",
 "once_cell",
@@ -1226,7 +1202,7 @@ dependencies = [
 "base_db",
 "cargo_metadata",
 "cfg",
- "itertools 0.10.0",
+ "itertools",
 "la-arena",
 "log",
 "paths",
@@ -1261,9 +1237,9 @@ dependencies = [
 [[package]]
 name = "quote"
-version = "1.0.8"
+version = "1.0.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "991431c3519a3f36861882da93630ce66b52918dcf1b8e2fd66b397fc96f28df"
+checksum = "c3d0b9745dc2debf507c8422de05d7226cc1f0644216dfdfead988f9b1ab32a7"
 dependencies = [
 "proc-macro2",
 ]
@@ -1286,18 +1262,21 @@ version = "1.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ab346ac5921dc62ffa9f89b7a773907511cdfa5490c572ae9be1be33e8afa4a"
 dependencies = [
- "crossbeam-channel 0.5.0",
+ "crossbeam-channel",
 "crossbeam-deque",
- "crossbeam-utils 0.8.1",
+ "crossbeam-utils",
 "lazy_static",
 "num_cpus",
 ]
 [[package]]
 name = "redox_syscall"
-version = "0.1.57"
+version = "0.2.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "41cc0f7e4d5d4544e8861606a285bb08d3e70712ccc7d2b84d7c0ccfaf4b05ce"
+checksum = "94341e4e44e24f6b591b59e47a8a027df12e008d73fd5672dbea9cc22f4507d9"
+dependencies = [
+ "bitflags",
+]
 [[package]]
 name = "regex"
@@ -1326,24 +1305,25 @@ checksum = "b5eb417147ba9860a96cfe72a0b93bf88fee1744b5636ec99ab20c1aa9376581"
 [[package]]
 name = "rowan"
-version = "0.10.5"
+version = "0.12.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e1898adeafc7d3c69913b33ee1acbbb39c726a9dbe05ff77c08b52957643e8db"
+checksum = "a1b36e449f3702f3b0c821411db1cbdf30fb451726a9456dce5dabcd44420043"
 dependencies = [
- "hashbrown 0.10.0",
+ "countme",
+ "hashbrown",
+ "memoffset",
 "rustc-hash",
- "smol_str",
 "text-size",
- "triomphe",
 ]
 [[package]]
 name = "rust-analyzer"
 version = "0.0.0"
 dependencies = [
+ "always-assert",
 "anyhow",
 "cfg",
- "crossbeam-channel 0.5.0",
+ "crossbeam-channel",
 "dissimilar",
 "env_logger",
 "expect-test",
@@ -1353,7 +1333,9 @@ dependencies = [
 "hir_ty",
 "ide",
 "ide_db",
- "itertools 0.10.0",
+ "ide_ssr",
+ "itertools",
+ "jemallocator",
 "jod-thread",
 "log",
 "lsp-server",
@@ -1362,7 +1344,6 @@ dependencies = [
 "mimalloc",
 "oorandom",
 "parking_lot",
- "pico-args",
 "proc_macro_srv",
 "profile",
 "project_model",
@@ -1371,7 +1352,6 @@ dependencies = [
 "serde",
 "serde_json",
 "serde_path_to_error",
- "ssr",
 "stdx",
 "syntax",
 "test_utils",
@@ -1384,14 +1364,15 @@ dependencies = [
 "tt",
 "vfs",
 "vfs-notify",
- "winapi 0.3.9",
+ "winapi",
+ "xflags",
 ]
 [[package]]
 name = "rustc-ap-rustc_lexer"
-version = "697.0.0"
+version = "708.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "67adbe260a0a11910624d6d28c0304fcf7b063e666682111005c83b09f73429d"
+checksum = "2706fc7106c75eaea49efe9f35f719a6fdfdb95212122ec2b543659406bae7ea"
 dependencies = [
 "unicode-xid",
 ]
@@ -1420,7 +1401,7 @@ version = "0.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d8fadca2ab5de17acf66d744f4888049ca8f1bb9b8a1ab8afd9d032cc959c5dc"
 dependencies = [
- "crossbeam-utils 0.8.1",
+ "crossbeam-utils",
 "indexmap",
 "lock_api",
 "log",
@@ -1485,18 +1466,18 @@ dependencies = [
 [[package]]
 name = "serde"
-version = "1.0.118"
+version = "1.0.123"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "06c64263859d87aa2eb554587e2d23183398d617427327cf2b3d0ed8c69e4800"
+checksum = "92d5161132722baa40d802cc70b15262b98258453e85e5d1d365c757c73869ae"
 dependencies = [
 "serde_derive",
 ]
 [[package]]
 name = "serde_derive"
-version = "1.0.118"
+version = "1.0.123"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c84d3526699cd55261af4b941e4e725444df67aa4f9e6a3564f18030d12672df"
+checksum = "9391c295d64fc0abb2c556bad848f33cb8296276b1ad2677d1ae1ace4f258f31"
 dependencies = [
 "proc-macro2",
 "quote",
@@ -1505,9 +1486,9 @@ dependencies = [
 [[package]]
 name = "serde_json"
-version = "1.0.61"
+version = "1.0.64"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4fceb2595057b6891a4ee808f70054bd2d12f0e97f1cbb78689b59f676df325a"
+checksum = "799e97dc9fdae36a5c8b8f2cae9ce2ee9fdce2058c57a93e6099d919fd982f79"
 dependencies = [
 "indexmap",
 "itoa",
@@ -1545,16 +1526,10 @@ dependencies = [
 ]
 [[package]]
-name = "slab"
-version = "0.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c111b5bd5695e56cffe5129854aa230b39c93a305372fdbb2668ca2394eea9f8"
-[[package]]
 name = "smallvec"
-version = "1.6.0"
+version = "1.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1a55ca5f3b68e41c979bf8c46a6f1da892ca4db8f94023ce0bd32407573b1ac0"
+checksum = "fe0f37c9e8f3c5a4a66ad655a93c74daac4ad00c441533bf5c6e7990bb42604e"
 [[package]]
 name = "smol_str"
@@ -1566,37 +1541,29 @@ dependencies = [
 ]
 [[package]]
-name = "ssr"
+name = "socket2"
-version = "0.0.0"
+version = "0.3.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "122e570113d28d773067fab24266b66753f6ea915758651696b6e35e49f88d6e"
 dependencies = [
- "expect-test",
+ "cfg-if",
- "hir",
+ "libc",
- "ide_db",
+ "winapi",
- "itertools 0.10.0",
- "rustc-hash",
- "syntax",
- "test_utils",
- "text_edit",
 ]
 [[package]]
-name = "stable_deref_trait"
-version = "1.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a8f112729512f8e442d81f95a8a7ddf2b7c6b8a1a6f509a95864142b30cab2d3"
-[[package]]
 name = "stdx"
 version = "0.0.0"
 dependencies = [
+ "always-assert",
 "backtrace",
 ]
 [[package]]
 name = "syn"
-version = "1.0.57"
+version = "1.0.60"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4211ce9909eb971f111059df92c45640aad50a619cf55cd76476be803c4c68e6"
+checksum = "c700597eca8a5a762beb35753ef6b94df201c81cca676604f547495a0d7f0081"
 dependencies = [
 "proc-macro2",
 "quote",
@@ -1622,7 +1589,7 @@ dependencies = [
 "arrayvec",
 "expect-test",
 "indexmap",
- "itertools 0.10.0",
+ "itertools",
 "once_cell",
 "parser",
 "profile",
@@ -1652,6 +1619,7 @@ name = "test_utils"
 version = "0.0.0"
 dependencies = [
 "dissimilar",
+ "profile",
 "rustc-hash",
 "serde_json",
 "stdx",
@@ -1673,11 +1641,11 @@ dependencies = [
 [[package]]
 name = "thread_local"
-version = "1.0.1"
+version = "1.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d40c6d1b69745a6ec6fb1ca717914848da4b44ae29d9b3080cbee91d72a69b14"
+checksum = "8018d24e04c95ac8790716a5987d0fec4f8b27249ffa0f7d33f1369bdfb88cbd"
 dependencies = [
- "lazy_static",
+ "once_cell",
 ]
 [[package]]
@@ -1690,21 +1658,10 @@ dependencies = [
 ]
 [[package]]
-name = "time"
-version = "0.1.44"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6db9e6914ab8b1ae1c260a4ae7a49b6c5611b40328a735b21862567685e73255"
-dependencies = [
- "libc",
- "wasi",
- "winapi 0.3.9",
-]
-[[package]]
 name = "tinyvec"
-version = "1.1.0"
+version = "1.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ccf8dbc19eb42fba10e8feaaec282fb50e2c14b2726d6301dbfeed0f73306a6f"
+checksum = "317cca572a0e89c3ce0ca1f1bdc9369547fe318a683418e42ac8f59d14701023"
 dependencies = [
 "tinyvec_macros",
 ]
@@ -1724,11 +1681,11 @@ dependencies = [
 [[package]]
 name = "tracing"
-version = "0.1.22"
+version = "0.1.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9f47026cdc4080c07e49b37087de021820269d996f581aac150ef9e5583eefe3"
+checksum = "01ebdc2bb4498ab1ab5f5b73c5803825e60199229ccba0698170e3be0e7f959f"
 dependencies = [
- "cfg-if 1.0.0",
+ "cfg-if",
 "pin-project-lite",
 "tracing-attributes",
 "tracing-core",
@@ -1736,9 +1693,9 @@ dependencies = [
 [[package]]
 name = "tracing-attributes"
-version = "0.1.11"
+version = "0.1.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "80e0ccfc3378da0cce270c946b676a376943f5cd16aeba64568e7939806f4ada"
+checksum = "a8a9bd1db7706f2373a190b0d067146caa39350c486f3d455b0e33b431f94c07"
 dependencies = [
 "proc-macro2",
 "quote",
@@ -1756,9 +1713,9 @@ dependencies = [
 [[package]]
 name = "tracing-log"
-version = "0.1.1"
+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5e0f8c7178e13481ff6765bd169b33e8d554c5d2bbede5e32c356194be02b9b9"
+checksum = "a6923477a48e41c1951f1999ef8bb5a3023eb723ceadafe78ffb65dc366761e3"
 dependencies = [
 "lazy_static",
 "log",
@@ -1777,9 +1734,9 @@ dependencies = [
 [[package]]
 name = "tracing-subscriber"
-version = "0.2.15"
+version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a1fa8f0c8f4c594e4fc9debc1990deab13238077271ba84dd853d54902ee3401"
+checksum = "8ab8966ac3ca27126141f7999361cc97dd6fb4b71da04c02044fa9045d98bb96"
 dependencies = [
 "ansi_term",
 "chrono",
@@ -1799,13 +1756,12 @@ dependencies = [
 [[package]]
 name = "tracing-tree"
-version = "0.1.7"
+version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "023e80cdb7c8468b7aade1d756afa2acbe2ae0a6142a25ec664b5239d6ef2794"
+checksum = "1a60657cfbf397c603257a8230b3f427e6a2a4e5911a59331b9bb4dffff5b608"
 dependencies = [
 "ansi_term",
 "atty",
- "chrono",
 "termcolor",
 "tracing",
 "tracing-log",
@@ -1813,17 +1769,6 @@ dependencies = [
 ]
 [[package]]
-name = "triomphe"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6e9d872053cf9e5a833d8c1dd772cdc38ab66a908129d6f73c049c986161d07c"
-dependencies = [
- "memoffset 0.5.6",
- "serde",
- "stable_deref_trait",
-]
-[[package]]
 name = "tt"
 version = "0.0.0"
 dependencies = [
@@ -1839,9 +1784,9 @@ checksum = "56dee185309b50d1f11bfedef0fe6d036842e3fb77413abef29f8f8d1c5d4c1c"
 [[package]]
 name = "ungrammar"
-version = "1.9.2"
+version = "1.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "58a02e2041a872d56354e843e8e86e6b946fc8e7dc32982fcdc335e29eb4cc8b"
+checksum = "84c629795d377049f2a1dc5f42cf505dc5ba8b28a5df0a03f4183a24480e4a6a"
 [[package]]
 name = "unicase"
@@ -1863,9 +1808,9 @@ dependencies = [
 [[package]]
 name = "unicode-normalization"
-version = "0.1.16"
+version = "0.1.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a13e63ab62dbe32aeee58d1c5408d35c36c392bba5d9d3142287219721afe606"
+checksum = "07fbfce1c8a97d547e8b5334978438d9d6ec8c20e38f56d4a4374d181493eaef"
 dependencies = [
 "tinyvec",
 ]
@@ -1884,9 +1829,9 @@ checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
 [[package]]
 name = "url"
-version = "2.2.0"
+version = "2.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5909f2b0817350449ed73e8bcd81c8c3c8d9a7a5d8acba4b27db277f1868976e"
+checksum = "9ccd964113622c8e9322cfac19eb1004a07e636c545f325da085d5cdde6f1f8b"
 dependencies = [
 "form_urlencoded",
 "idna",
@@ -1914,7 +1859,7 @@ dependencies = [
 name = "vfs-notify"
 version = "0.0.0"
 dependencies = [
- "crossbeam-channel 0.5.0",
+ "crossbeam-channel",
 "jod-thread",
 "log",
 "notify",
@@ -1931,23 +1876,11 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "777182bc735b6424e1a57516d35ed72cb8019d85c8c9bf536dccb3445c1a2f7d"
 dependencies = [
 "same-file",
- "winapi 0.3.9",
+ "winapi",
 "winapi-util",
 ]
 [[package]]
-name = "wasi"
-version = "0.10.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1a143597ca7c7793eff794def352d41792a93c481eb1042423ff7ff72ba2c31f"
-[[package]]
-name = "winapi"
-version = "0.2.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
-[[package]]
 name = "winapi"
 version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1958,12 +1891,6 @@ dependencies = [
 ]
 [[package]]
-name = "winapi-build"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
-[[package]]
 name = "winapi-i686-pc-windows-gnu"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1975,7 +1902,7 @@ version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
 dependencies = [
- "winapi 0.3.9",
+ "winapi",
 ]
 [[package]]
@@ -1991,29 +1918,37 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "06069a848f95fceae3e5e03c0ddc8cb78452b56654ee0c8e68f938cf790fb9e3"
 [[package]]
-name = "ws2_32-sys"
+name = "xflags"
-version = "0.2.1"
+version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
+checksum = "ddb4b07c0db813f8e2b5e1b2189ef56fcddb27a6f9ef71314dbf8cc50096a5db"
 dependencies = [
- "winapi 0.2.8",
+ "xflags-macros",
- "winapi-build",
+]
+[[package]]
+name = "xflags-macros"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f8e168a99d6ce9d5dd0d0913f1bded279377843952dd8ff83f81b862a1dad0e1"
+dependencies = [
+ "proc-macro2",
 ]
 [[package]]
 name = "xshell"
-version = "0.1.8"
+version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ed373ede30cea03e8c0af22f48ee1ba80efbf06fec8b4746977e6ee703878de0"
+checksum = "6f18102278453c8f70ea5c514ac78cb4c73a0ef72a8273d17094b52f9584c0c1"
 dependencies = [
 "xshell-macros",
 ]
 [[package]]
 name = "xshell-macros"
-version = "0.1.8"
+version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7f6af9f8119104697b0105989a73c578ce33f922d9d6f3dae0e8ae3d538db321"
+checksum = "6093c460064572007f885facc70bb0ca5e40a83ea7ff8b16c1abbee56fd2e767"
 [[package]]
 name = "xtask"
@@ -2021,11 +1956,11 @@ version = "0.1.0"
 dependencies = [
 "anyhow",
 "flate2",
- "pico-args",
 "proc-macro2",
 "quote",
 "ungrammar",
 "walkdir",
 "write-json",
+ "xflags",
 "xshell",
 ]
diff --git a/README.md b/README.md
index a499a1651..74f944ae4 100644
--- a/README.md
+++ b/README.md
@@ -42,6 +42,7 @@ https://rust-lang.zulipchat.com/#narrow/stream/185405-t-compiler.2Frls-2.2E0
 * Website: https://rust-analyzer.github.io/
 * Metrics: https://rust-analyzer.github.io/metrics/
 * API docs: https://rust-analyzer.github.io/rust-analyzer/ide/
+* Changelog: https://rust-analyzer.github.io/thisweek
 ## License
diff --git a/bench_data/glorious_old_parser b/bench_data/glorious_old_parser
new file mode 100644
index 000000000..7e900dfeb
--- /dev/null
+++ b/bench_data/glorious_old_parser
@@ -0,0 +1,8562 @@
+use crate::ast::{AngleBracketedArgs, ParenthesizedArgs, AttrStyle, BareFnTy};
+use crate::ast::{GenericBound, TraitBoundModifier};
+use crate::ast::Unsafety;
+use crate::ast::{Mod, AnonConst, Arg, Arm, Guard, Attribute, BindingMode, TraitItemKind};
+use crate::ast::Block;
+use crate::ast::{BlockCheckMode, CaptureBy, Movability};
+use crate::ast::{Constness, Crate};
+use crate::ast::Defaultness;
+use crate::ast::EnumDef;
+use crate::ast::{Expr, ExprKind, RangeLimits};
+use crate::ast::{Field, FnDecl, FnHeader};
+use crate::ast::{ForeignItem, ForeignItemKind, FunctionRetTy};
+use crate::ast::{GenericParam, GenericParamKind};
+use crate::ast::GenericArg;
+use crate::ast::{Ident, ImplItem, IsAsync, IsAuto, Item, ItemKind};
+use crate::ast::{Label, Lifetime, Lit, LitKind};
+use crate::ast::Local;
+use crate::ast::MacStmtStyle;
+use crate::ast::{Mac, Mac_, MacDelimiter};
+use crate::ast::{MutTy, Mutability};
+use crate::ast::{Pat, PatKind, PathSegment};
+use crate::ast::{PolyTraitRef, QSelf};
+use crate::ast::{Stmt, StmtKind};
+use crate::ast::{VariantData, StructField};
+use crate::ast::StrStyle;
+use crate::ast::SelfKind;
+use crate::ast::{TraitItem, TraitRef, TraitObjectSyntax};
+use crate::ast::{Ty, TyKind, TypeBinding, GenericBounds};
+use crate::ast::{Visibility, VisibilityKind, WhereClause, CrateSugar};
+use crate::ast::{UseTree, UseTreeKind};
+use crate::ast::{BinOpKind, UnOp};
+use crate::ast::{RangeEnd, RangeSyntax};
+use crate::{ast, attr};
+use crate::ext::base::DummyResult;
+use crate::source_map::{self, SourceMap, Spanned, respan};
+use crate::parse::{self, SeqSep, classify, token};
+use crate::parse::lexer::{TokenAndSpan, UnmatchedBrace};
+use crate::parse::lexer::comments::{doc_comment_style, strip_doc_comment_decoration};
+use crate::parse::token::DelimToken;
+use crate::parse::{new_sub_parser_from_file, ParseSess, Directory, DirectoryOwnership};
+use crate::util::parser::{AssocOp, Fixity};
+use crate::print::pprust;
+use crate::ptr::P;
+use crate::parse::PResult;
+use crate::ThinVec;
+use crate::tokenstream::{self, DelimSpan, TokenTree, TokenStream, TreeAndJoint};
+use crate::symbol::{Symbol, keywords};
+use errors::{Applicability, DiagnosticBuilder, DiagnosticId};
+use rustc_target::spec::abi::{self, Abi};
+use syntax_pos::{Span, MultiSpan, BytePos, FileName};
+use log::{debug, trace};
+use std::borrow::Cow;
+use std::cmp;
+use std::mem;
+use std::path::{self, Path, PathBuf};
+use std::slice;
+#[derive(Debug)]
+/// Whether the type alias or associated type is a concrete type or an existential type
+pub enum AliasKind {
+    /// Just a new name for the same type
+    Weak(P<Ty>),
+    /// Only trait impls of the type will be usable, not the actual type itself
+    Existential(GenericBounds),
+}
+bitflags::bitflags! {
+    struct Restrictions: u8 {
+        const STMT_EXPR         = 1 << 0;
+        const NO_STRUCT_LITERAL = 1 << 1;
+    }
+}
+type ItemInfo = (Ident, ItemKind, Option<Vec<Attribute>>);
+/// Specifies how to parse a path.
+#[derive(Copy, Clone, PartialEq)]
+pub enum PathStyle {
+    /// In some contexts, notably in expressions, paths with generic arguments are ambiguous
+    /// with something else. For example, in expressions `segment < ....` can be interpreted
+    /// as a comparison and `segment ( ....` can be interpreted as a function call.
+    /// In all such contexts the non-path interpretation is preferred by default for practical
+    /// reasons, but the path interpretation can be forced by the disambiguator `::`, e.g.
+    /// `x<y>` - comparisons, `x::<y>` - unambiguously a path.
+    Expr,
+    /// In other contexts, notably in types, no ambiguity exists and paths can be written
+    /// without the disambiguator, e.g., `x<y>` - unambiguously a path.
+    /// Paths with disambiguators are still accepted, `x::<Y>` - unambiguously a path too.
+    Type,
+    /// A path with generic arguments disallowed, e.g., `foo::bar::Baz`, used in imports,
+    /// visibilities or attributes.
+    /// Technically, this variant is unnecessary and e.g., `Expr` can be used instead
+    /// (paths in "mod" contexts have to be checked later for absence of generic arguments
+    /// anyway, due to macros), but it is used to avoid weird suggestions about expected
+    /// tokens when something goes wrong.
+    Mod,
+}
+#[derive(Clone, Copy, PartialEq, Debug)]
+enum SemiColonMode {
+    Break,
+    Ignore,
+    Comma,
+}
+#[derive(Clone, Copy, PartialEq, Debug)]
+enum BlockMode {
+    Break,
+    Ignore,
+}
+/// Possibly accepts an `token::Interpolated` expression (a pre-parsed expression
+/// dropped into the token stream, which happens while parsing the result of
+/// macro expansion). Placement of these is not as complex as I feared it would
+/// be. The important thing is to make sure that lookahead doesn't balk at
+/// `token::Interpolated` tokens.
+macro_rules! maybe_whole_expr {
+    ($p:expr) => {
+        if let token::Interpolated(nt) = $p.token.clone() {
+            match *nt {
+                token::NtExpr(ref e) | token::NtLiteral(ref e) => {
+                    $p.bump();
+                    return Ok((*e).clone());
+                }
+                token::NtPath(ref path) => {
+                    $p.bump();
+                    let span = $p.span;
+                    let kind = ExprKind::Path(None, (*path).clone());
+                    return Ok($p.mk_expr(span, kind, ThinVec::new()));
+                }
+                token::NtBlock(ref block) => {
+                    $p.bump();
+                    let span = $p.span;
+                    let kind = ExprKind::Block((*block).clone(), None);
+                    return Ok($p.mk_expr(span, kind, ThinVec::new()));
+                }
+                _ => {},
+            };
+        }
+    }
+}
+/// As maybe_whole_expr, but for things other than expressions
+macro_rules! maybe_whole {
+    ($p:expr, $constructor:ident, |$x:ident| $e:expr) => {
+        if let token::Interpolated(nt) = $p.token.clone() {
+            if let token::$constructor($x) = (*nt).clone() {
+                $p.bump();
+                return Ok($e);
+            }
+        }
+    };
+}
+fn maybe_append(mut lhs: Vec<Attribute>, mut rhs: Option<Vec<Attribute>>) -> Vec<Attribute> {
+    if let Some(ref mut rhs) = rhs {
+        lhs.append(rhs);
+    }
+    lhs
+}
+#[derive(Debug, Clone, Copy, PartialEq)]
+enum PrevTokenKind {
+    DocComment,
+    Comma,
+    Plus,
+    Interpolated,
+    Eof,
+    Ident,
+    Other,
+}
+trait RecoverQPath: Sized {
+    const PATH_STYLE: PathStyle = PathStyle::Expr;
+    fn to_ty(&self) -> Option<P<Ty>>;
+    fn to_recovered(&self, qself: Option<QSelf>, path: ast::Path) -> Self;
+    fn to_string(&self) -> String;
+}
+impl RecoverQPath for Ty {
+    const PATH_STYLE: PathStyle = PathStyle::Type;
+    fn to_ty(&self) -> Option<P<Ty>> {
+        Some(P(self.clone()))
+    }
+    fn to_recovered(&self, qself: Option<QSelf>, path: ast::Path) -> Self {
+        Self { span: path.span, node: TyKind::Path(qself, path), id: self.id }
+    }
+    fn to_string(&self) -> String {
+        pprust::ty_to_string(self)
+    }
+}
+impl RecoverQPath for Pat {
+    fn to_ty(&self) -> Option<P<Ty>> {
+        self.to_ty()
+    }
+    fn to_recovered(&self, qself: Option<QSelf>, path: ast::Path) -> Self {
+        Self { span: path.span, node: PatKind::Path(qself, path), id: self.id }
+    }
+    fn to_string(&self) -> String {
+        pprust::pat_to_string(self)
+    }
+}
+impl RecoverQPath for Expr {
+    fn to_ty(&self) -> Option<P<Ty>> {
+        self.to_ty()
+    }
+    fn to_recovered(&self, qself: Option<QSelf>, path: ast::Path) -> Self {
+        Self { span: path.span, node: ExprKind::Path(qself, path),
+               id: self.id, attrs: self.attrs.clone() }
+    }
+    fn to_string(&self) -> String {
+        pprust::expr_to_string(self)
+    }
+}
+/* ident is handled by common.rs */
+#[derive(Clone)]
+pub struct Parser<'a> {
+    pub sess: &'a ParseSess,
+    /// the current token:
+    pub token: token::Token,
+    /// the span of the current token:
+    pub span: Span,
+    /// the span of the previous token:
+    meta_var_span: Option<Span>,
+    pub prev_span: Span,
+    /// the previous token kind
+    prev_token_kind: PrevTokenKind,
+    restrictions: Restrictions,
+    /// Used to determine the path to externally loaded source files
+    crate directory: Directory<'a>,
+    /// Whether to parse sub-modules in other files.
+    pub recurse_into_file_modules: bool,
+    /// Name of the root module this parser originated from. If `None`, then the
+    /// name is not known. This does not change while the parser is descending
+    /// into modules, and sub-parsers have new values for this name.
+    pub root_module_name: Option<String>,
+    crate expected_tokens: Vec<TokenType>,
+    token_cursor: TokenCursor,
+    desugar_doc_comments: bool,
+    /// Whether we should configure out of line modules as we parse.
+    pub cfg_mods: bool,
+    /// This field is used to keep track of how many left angle brackets we have seen. This is
+    /// required in order to detect extra leading left angle brackets (`<` characters) and error
+    /// appropriately.
+    ///
+    /// See the comments in the `parse_path_segment` function for more details.
+    crate unmatched_angle_bracket_count: u32,
+    crate max_angle_bracket_count: u32,
+    /// List of all unclosed delimiters found by the lexer. If an entry is used for error recovery
+    /// it gets removed from here. Every entry left at the end gets emitted as an independent
+    /// error.
+    crate unclosed_delims: Vec<UnmatchedBrace>,
+}
+#[derive(Clone)]
+struct TokenCursor {
+    frame: TokenCursorFrame,
+    stack: Vec<TokenCursorFrame>,
+}
+#[derive(Clone)]
+struct TokenCursorFrame {
+    delim: token::DelimToken,
+    span: DelimSpan,
+    open_delim: bool,
+    tree_cursor: tokenstream::Cursor,
+    close_delim: bool,
+    last_token: LastToken,
+}
+/// This is used in `TokenCursorFrame` above to track tokens that are consumed
+/// by the parser, and then that's transitively used to record the tokens that
+/// each parse AST item is created with.
+///
+/// Right now this has two states, either collecting tokens or not collecting
+/// tokens. If we're collecting tokens we just save everything off into a local
+/// `Vec`. This should eventually though likely save tokens from the original
+/// token stream and just use slicing of token streams to avoid creation of a
+/// whole new vector.
+///
+/// The second state is where we're passively not recording tokens, but the last
+/// token is still tracked for when we want to start recording tokens. This
+/// "last token" means that when we start recording tokens we'll want to ensure
+/// that this, the first token, is included in the output.
+///
+/// You can find some more example usage of this in the `collect_tokens` method
+/// on the parser.
+#[derive(Clone)]
+enum LastToken {
+    Collecting(Vec<TreeAndJoint>),
+    Was(Option<TreeAndJoint>),
+}
+impl TokenCursorFrame {
+    fn new(sp: DelimSpan, delim: DelimToken, tts: &TokenStream) -> Self {
+        TokenCursorFrame {
+            delim: delim,
+            span: sp,
+            open_delim: delim == token::NoDelim,
+            tree_cursor: tts.clone().into_trees(),
+            close_delim: delim == token::NoDelim,
+            last_token: LastToken::Was(None),
+        }
+    }
+}
+impl TokenCursor {
+    fn next(&mut self) -> TokenAndSpan {
+        loop {
+            let tree = if !self.frame.open_delim {
+                self.frame.open_delim = true;
+                TokenTree::open_tt(self.frame.span.open, self.frame.delim)
+            } else if let Some(tree) = self.frame.tree_cursor.next() {
+                tree
+            } else if !self.frame.close_delim {
+                self.frame.close_delim = true;
+                TokenTree::close_tt(self.frame.span.close, self.frame.delim)
+            } else if let Some(frame) = self.stack.pop() {
+                self.frame = frame;
+                continue
+            } else {
+                return TokenAndSpan { tok: token::Eof, sp: syntax_pos::DUMMY_SP }
+            };
+            match self.frame.last_token {
+                LastToken::Collecting(ref mut v) => v.push(tree.clone().into()),
+                LastToken::Was(ref mut t) => *t = Some(tree.clone().into()),
+            }
+            match tree {
+                TokenTree::Token(sp, tok) => return TokenAndSpan { tok: tok, sp: sp },
+                TokenTree::Delimited(sp, delim, tts) => {
+                    let frame = TokenCursorFrame::new(sp, delim, &tts);
+                    self.stack.push(mem::replace(&mut self.frame, frame));
+                }
+            }
+        }
+    }
+    fn next_desugared(&mut self) -> TokenAndSpan {
+        let (sp, name) = match self.next() {
+            TokenAndSpan { sp, tok: token::DocComment(name) } => (sp, name),
+            tok => return tok,
+        };
+        let stripped = strip_doc_comment_decoration(&name.as_str());
+        // Searches for the occurrences of `"#*` and returns the minimum number of `#`s
+        // required to wrap the text.
+        let mut num_of_hashes = 0;
+        let mut count = 0;
+        for ch in stripped.chars() {
+            count = match ch {
+                '"' => 1,
+                '#' if count > 0 => count + 1,
+                _ => 0,
+            };
+            num_of_hashes = cmp::max(num_of_hashes, count);
+        }
+        let delim_span = DelimSpan::from_single(sp);
+        let body = TokenTree::Delimited(
+            delim_span,
+            token::Bracket,
+            [TokenTree::Token(sp, token::Ident(ast::Ident::from_str("doc"), false)),
+             TokenTree::Token(sp, token::Eq),
+             TokenTree::Token(sp, token::Literal(
+                token::StrRaw(Symbol::intern(&stripped), num_of_hashes), None))
+            ]
+            .iter().cloned().collect::<TokenStream>().into(),
+        );
+        self.stack.push(mem::replace(&mut self.frame, TokenCursorFrame::new(
+            delim_span,
+            token::NoDelim,
+            &if doc_comment_style(&name.as_str()) == AttrStyle::Inner {
+                [TokenTree::Token(sp, token::Pound), TokenTree::Token(sp, token::Not), body]
+                    .iter().cloned().collect::<TokenStream>().into()
+            } else {
+                [TokenTree::Token(sp, token::Pound), body]
+                    .iter().cloned().collect::<TokenStream>().into()
+            },
+        )));
+        self.next()
+    }
+}
+#[derive(Clone, PartialEq)]
+crate enum TokenType {
+    Token(token::Token),
+    Keyword(keywords::Keyword),
+    Operator,
+    Lifetime,
+    Ident,
+    Path,
+    Type,
+    Const,
+}
+impl TokenType {
+    fn to_string(&self) -> String {
+        match *self {
+            TokenType::Token(ref t) => format!("`{}`", pprust::token_to_string(t)),
+            TokenType::Keyword(kw) => format!("`{}`", kw.name()),
+            TokenType::Operator => "an operator".to_string(),
+            TokenType::Lifetime => "lifetime".to_string(),
+            TokenType::Ident => "identifier".to_string(),
+            TokenType::Path => "path".to_string(),
+            TokenType::Type => "type".to_string(),
+            TokenType::Const => "const".to_string(),
+        }
+    }
+}
+/// Returns `true` if `IDENT t` can start a type -- `IDENT::a::b`, `IDENT<u8, u8>`,
+/// `IDENT<<u8 as Trait>::AssocTy>`.
+///
+/// Types can also be of the form `IDENT(u8, u8) -> u8`, however this assumes
+/// that `IDENT` is not the ident of a fn trait.
+fn can_continue_type_after_non_fn_ident(t: &token::Token) -> bool {
+    t == &token::ModSep || t == &token::Lt ||
+    t == &token::BinOp(token::Shl)
+}
+/// Information about the path to a module.
+pub struct ModulePath {
+    name: String,
+    path_exists: bool,
+    pub result: Result<ModulePathSuccess, Error>,
+}
+pub struct ModulePathSuccess {
+    pub path: PathBuf,
+    pub directory_ownership: DirectoryOwnership,
+    warn: bool,
+}
+pub enum Error {
+    FileNotFoundForModule {
+        mod_name: String,
+        default_path: String,
+        secondary_path: String,
+        dir_path: String,
+    },
+    DuplicatePaths {
+        mod_name: String,
+        default_path: String,
+        secondary_path: String,
+    },
+    UselessDocComment,
+    InclusiveRangeWithNoEnd,
+}
+impl Error {
+    fn span_err<S: Into<MultiSpan>>(self,
+                                        sp: S,
+                                        handler: &errors::Handler) -> DiagnosticBuilder<'_> {
+        match self {
+            Error::FileNotFoundForModule { ref mod_name,
+                                           ref default_path,
+                                           ref secondary_path,
+                                           ref dir_path } => {
+                let mut err = struct_span_err!(handler, sp, E0583,
+                                               "file not found for module `{}`", mod_name);
+                err.help(&format!("name the file either {} or {} inside the directory \"{}\"",
+                                  default_path,
+                                  secondary_path,
+                                  dir_path));
+                err
+            }
+            Error::DuplicatePaths { ref mod_name, ref default_path, ref secondary_path } => {
+                let mut err = struct_span_err!(handler, sp, E0584,
+                                               "file for module `{}` found at both {} and {}",
+                                               mod_name,
+                                               default_path,
+                                               secondary_path);
+                err.help("delete or rename one of them to remove the ambiguity");
+                err
+            }
+            Error::UselessDocComment => {
+                let mut err = struct_span_err!(handler, sp, E0585,
+                                  "found a documentation comment that doesn't document anything");
+                err.help("doc comments must come before what they document, maybe a comment was \
+                          intended with `//`?");
+                err
+            }
+            Error::InclusiveRangeWithNoEnd => {
+                let mut err = struct_span_err!(handler, sp, E0586,
+                                               "inclusive range with no end");
+                err.help("inclusive ranges must be bounded at the end (`..=b` or `a..=b`)");
+                err
+            }
+        }
+    }
+}
+#[derive(Debug)]
+enum LhsExpr {
+    NotYetParsed,
+    AttributesParsed(ThinVec<Attribute>),
+    AlreadyParsed(P<Expr>),
+}
+impl From<Option<ThinVec<Attribute>>> for LhsExpr {
+    fn from(o: Option<ThinVec<Attribute>>) -> Self {
+        if let Some(attrs) = o {
+            LhsExpr::AttributesParsed(attrs)
+        } else {
+            LhsExpr::NotYetParsed
+        }
+    }
+}
+impl From<P<Expr>> for LhsExpr {
+    fn from(expr: P<Expr>) -> Self {
+        LhsExpr::AlreadyParsed(expr)
+    }
+}
+/// Creates a placeholder argument.
+fn dummy_arg(span: Span) -> Arg {
+    let ident = Ident::new(keywords::Invalid.name(), span);
+    let pat = P(Pat {
+        id: ast::DUMMY_NODE_ID,
+        node: PatKind::Ident(BindingMode::ByValue(Mutability::Immutable), ident, None),
+        span,
+    });
+    let ty = Ty {
+        node: TyKind::Err,
+        span,
+        id: ast::DUMMY_NODE_ID
+    };
+    Arg { ty: P(ty), pat: pat, id: ast::DUMMY_NODE_ID }
+}
+#[derive(Copy, Clone, Debug)]
+enum TokenExpectType {
+    Expect,
+    NoExpect,
+}
+impl<'a> Parser<'a> {
+    pub fn new(sess: &'a ParseSess,
+               tokens: TokenStream,
+               directory: Option<Directory<'a>>,
+               recurse_into_file_modules: bool,
+               desugar_doc_comments: bool)
+               -> Self {
+        let mut parser = Parser {
+            sess,
+            token: token::Whitespace,
+            span: syntax_pos::DUMMY_SP,
+            prev_span: syntax_pos::DUMMY_SP,
+            meta_var_span: None,
+            prev_token_kind: PrevTokenKind::Other,
+            restrictions: Restrictions::empty(),
+            recurse_into_file_modules,
+            directory: Directory {
+                path: Cow::from(PathBuf::new()),
+                ownership: DirectoryOwnership::Owned { relative: None }
+            },
+            root_module_name: None,
+            expected_tokens: Vec::new(),
+            token_cursor: TokenCursor {
+                frame: TokenCursorFrame::new(
+                    DelimSpan::dummy(),
+                    token::NoDelim,
+                    &tokens.into(),
+                ),
+                stack: Vec::new(),
+            },
+            desugar_doc_comments,
+            cfg_mods: true,
+            unmatched_angle_bracket_count: 0,
+            max_angle_bracket_count: 0,
+            unclosed_delims: Vec::new(),
+        };
+        let tok = parser.next_tok();
+        parser.token = tok.tok;
+        parser.span = tok.sp;
+        if let Some(directory) = directory {
+            parser.directory = directory;
+        } else if !parser.span.is_dummy() {
+            if let FileName::Real(mut path) = sess.source_map().span_to_unmapped_path(parser.span) {
+                path.pop();
+                parser.directory.path = Cow::from(path);
+            }
+        }
+        parser.process_potential_macro_variable();
+        parser
+    }
+    fn next_tok(&mut self) -> TokenAndSpan {
+        let mut next = if self.desugar_doc_comments {
+            self.token_cursor.next_desugared()
+        } else {
+            self.token_cursor.next()
+        };
+        if next.sp.is_dummy() {
+            // Tweak the location for better diagnostics, but keep syntactic context intact.
+            next.sp = self.prev_span.with_ctxt(next.sp.ctxt());
+        }
+        next
+    }
+    /// Converts the current token to a string using `self`'s reader.
+    pub fn this_token_to_string(&self) -> String {
+        pprust::token_to_string(&self.token)
+    }
+    fn token_descr(&self) -> Option<&'static str> {
+        Some(match &self.token {
+            t if t.is_special_ident() => "reserved identifier",
+            t if t.is_used_keyword() => "keyword",
+            t if t.is_unused_keyword() => "reserved keyword",
+            token::DocComment(..) => "doc comment",
+            _ => return None,
+        })
+    }
+    fn this_token_descr(&self) -> String {
+        if let Some(prefix) = self.token_descr() {
+            format!("{} `{}`", prefix, self.this_token_to_string())
+        } else {
+            format!("`{}`", self.this_token_to_string())
+        }
+    }
+    fn unexpected_last<T>(&self, t: &token::Token) -> PResult<'a, T> {
+        let token_str = pprust::token_to_string(t);
+        Err(self.span_fatal(self.prev_span, &format!("unexpected token: `{}`", token_str)))
+    }
+    crate fn unexpected<T>(&mut self) -> PResult<'a, T> {
+        match self.expect_one_of(&[], &[]) {
+            Err(e) => Err(e),
+            Ok(_) => unreachable!(),
+        }
+    }
+    /// Expects and consumes the token `t`. Signals an error if the next token is not `t`.
+    pub fn expect(&mut self, t: &token::Token) -> PResult<'a,  bool /* recovered */> {
+        if self.expected_tokens.is_empty() {
+            if self.token == *t {
+                self.bump();
+                Ok(false)
+            } else {
+                let token_str = pprust::token_to_string(t);
+                let this_token_str = self.this_token_descr();
+                let mut err = self.fatal(&format!("expected `{}`, found {}",
+                                                  token_str,
+                                                  this_token_str));
+                let sp = if self.token == token::Token::Eof {
+                    // EOF, don't want to point at the following char, but rather the last token
+                    self.prev_span
+                } else {
+                    self.sess.source_map().next_point(self.prev_span)
+                };
+                let label_exp = format!("expected `{}`", token_str);
+                match self.recover_closing_delimiter(&[t.clone()], err) {
+                    Err(e) => err = e,
+                    Ok(recovered) => {
+                        return Ok(recovered);
+                    }
+                }
+                let cm = self.sess.source_map();
+                match (cm.lookup_line(self.span.lo()), cm.lookup_line(sp.lo())) {
+                    (Ok(ref a), Ok(ref b)) if a.line == b.line => {
+                        // When the spans are in the same line, it means that the only content
+                        // between them is whitespace, point only at the found token.
+                        err.span_label(self.span, label_exp);
+                    }
+                    _ => {
+                        err.span_label(sp, label_exp);
+                        err.span_label(self.span, "unexpected token");
+                    }
+                }
+                Err(err)
+            }
+        } else {
+            self.expect_one_of(slice::from_ref(t), &[])
+        }
+    }
+    fn recover_closing_delimiter(
+        &mut self,
+        tokens: &[token::Token],
+        mut err: DiagnosticBuilder<'a>,
+    ) -> PResult<'a, bool> {
+        let mut pos = None;
+        // we want to use the last closing delim that would apply
+        for (i, unmatched) in self.unclosed_delims.iter().enumerate().rev() {
+            if tokens.contains(&token::CloseDelim(unmatched.expected_delim))
+                && Some(self.span) > unmatched.unclosed_span
+            {
+                pos = Some(i);
+            }
+        }
+        match pos {
+            Some(pos) => {
+                // Recover and assume that the detected unclosed delimiter was meant for
+                // this location. Emit the diagnostic and act as if the delimiter was
+                // present for the parser's sake.
+                 // Don't attempt to recover from this unclosed delimiter more than once.
+                let unmatched = self.unclosed_delims.remove(pos);
+                let delim = TokenType::Token(token::CloseDelim(unmatched.expected_delim));
+                 // We want to suggest the inclusion of the closing delimiter where it makes
+                // the most sense, which is immediately after the last token:
+                //
+                //  {foo(bar {}}
+                //      -      ^
+                //      |      |
+                //      |      help: `)` may belong here (FIXME: #58270)
+                //      |
+                //      unclosed delimiter
+                if let Some(sp) = unmatched.unclosed_span {
+                    err.span_label(sp, "unclosed delimiter");
+                }
+                err.span_suggestion_short(
+                    self.sess.source_map().next_point(self.prev_span),
+                    &format!("{} may belong here", delim.to_string()),
+                    delim.to_string(),
+                    Applicability::MaybeIncorrect,
+                );
+                err.emit();
+                self.expected_tokens.clear();  // reduce errors
+                Ok(true)
+            }
+            _ => Err(err),
+        }
+    }
+    /// Expect next token to be edible or inedible token.  If edible,
+    /// then consume it; if inedible, then return without consuming
+    /// anything.  Signal a fatal error if next token is unexpected.
+    pub fn expect_one_of(
+        &mut self,
+        edible: &[token::Token],
+        inedible: &[token::Token],
+    ) -> PResult<'a, bool /* recovered */> {
+        fn tokens_to_string(tokens: &[TokenType]) -> String {
+            let mut i = tokens.iter();
+            // This might be a sign we need a connect method on Iterator.
+            let b = i.next()
+                     .map_or(String::new(), |t| t.to_string());
+            i.enumerate().fold(b, |mut b, (i, a)| {
+                if tokens.len() > 2 && i == tokens.len() - 2 {
+                    b.push_str(", or ");
+                } else if tokens.len() == 2 && i == tokens.len() - 2 {
+                    b.push_str(" or ");
+                } else {
+                    b.push_str(", ");
+                }
+                b.push_str(&a.to_string());
+                b
+            })
+        }
+        if edible.contains(&self.token) {
+            self.bump();
+            Ok(false)
+        } else if inedible.contains(&self.token) {
+            // leave it in the input
+            Ok(false)
+        } else {
+            let mut expected = edible.iter()
+                .map(|x| TokenType::Token(x.clone()))
+                .chain(inedible.iter().map(|x| TokenType::Token(x.clone())))
+                .chain(self.expected_tokens.iter().cloned())
+                .collect::<Vec<_>>();
+            expected.sort_by_cached_key(|x| x.to_string());
+            expected.dedup();
+            let expect = tokens_to_string(&expected[..]);
+            let actual = self.this_token_to_string();
+            let (msg_exp, (label_sp, label_exp)) = if expected.len() > 1 {
+                let short_expect = if expected.len() > 6 {
+                    format!("{} possible tokens", expected.len())
+                } else {
+                    expect.clone()
+                };
+                (format!("expected one of {}, found `{}`", expect, actual),
+                 (self.sess.source_map().next_point(self.prev_span),
+                  format!("expected one of {} here", short_expect)))
+            } else if expected.is_empty() {
+                (format!("unexpected token: `{}`", actual),
+                 (self.prev_span, "unexpected token after this".to_string()))
+            } else {
+                (format!("expected {}, found `{}`", expect, actual),
+                 (self.sess.source_map().next_point(self.prev_span),
+                  format!("expected {} here", expect)))
+            };
+            let mut err = self.fatal(&msg_exp);
+            if self.token.is_ident_named("and") {
+                err.span_suggestion_short(
+                    self.span,
+                    "use `&&` instead of `and` for the boolean operator",
+                    "&&".to_string(),
+                    Applicability::MaybeIncorrect,
+                );
+            }
+            if self.token.is_ident_named("or") {
+                err.span_suggestion_short(
+                    self.span,
+                    "use `||` instead of `or` for the boolean operator",
+                    "||".to_string(),
+                    Applicability::MaybeIncorrect,
+                );
+            }
+            let sp = if self.token == token::Token::Eof {
+                // This is EOF, don't want to point at the following char, but rather the last token
+                self.prev_span
+            } else {
+                label_sp
+            };
+            match self.recover_closing_delimiter(&expected.iter().filter_map(|tt| match tt {
+                TokenType::Token(t) => Some(t.clone()),
+                _ => None,
+            }).collect::<Vec<_>>(), err) {
+                Err(e) => err = e,
+                Ok(recovered) => {
+                    return Ok(recovered);
+                }
+            }
+            let cm = self.sess.source_map();
+            match (cm.lookup_line(self.span.lo()), cm.lookup_line(sp.lo())) {
+                (Ok(ref a), Ok(ref b)) if a.line == b.line => {
+                    // When the spans are in the same line, it means that the only content between
+                    // them is whitespace, point at the found token in that case:
+                    //
+                    // X |     () => { syntax error };
+                    //   |                    ^^^^^ expected one of 8 possible tokens here
+                    //
+                    // instead of having:
+                    //
+                    // X |     () => { syntax error };
+                    //   |                   -^^^^^ unexpected token
+                    //   |                   |
+                    //   |                   expected one of 8 possible tokens here
+                    err.span_label(self.span, label_exp);
+                }
+                _ if self.prev_span == syntax_pos::DUMMY_SP => {
+                    // Account for macro context where the previous span might not be
+                    // available to avoid incorrect output (#54841).
+                    err.span_label(self.span, "unexpected token");
+                }
+                _ => {
+                    err.span_label(sp, label_exp);
+                    err.span_label(self.span, "unexpected token");
+                }
+            }
+            Err(err)
+        }
+    }
+    /// Returns the span of expr, if it was not interpolated or the span of the interpolated token.
+    fn interpolated_or_expr_span(&self,
+                                 expr: PResult<'a, P<Expr>>)
+                                 -> PResult<'a, (Span, P<Expr>)> {
+        expr.map(|e| {
+            if self.prev_token_kind == PrevTokenKind::Interpolated {
+                (self.prev_span, e)
+            } else {
+                (e.span, e)
+            }
+        })
+    }
+    fn expected_ident_found(&self) -> DiagnosticBuilder<'a> {
+        let mut err = self.struct_span_err(self.span,
+                                           &format!("expected identifier, found {}",
+                                                    self.this_token_descr()));
+        if let token::Ident(ident, false) = &self.token {
+            if ident.is_reserved() && !ident.is_path_segment_keyword() &&
+                ident.name != keywords::Underscore.name()
+            {
+                err.span_suggestion(
+                    self.span,
+                    "you can escape reserved keywords to use them as identifiers",
+                    format!("r#{}", ident),
+                    Applicability::MaybeIncorrect,
+                );
+            }
+        }
+        if let Some(token_descr) = self.token_descr() {
+            err.span_label(self.span, format!("expected identifier, found {}", token_descr));
+        } else {
+            err.span_label(self.span, "expected identifier");
+            if self.token == token::Comma && self.look_ahead(1, |t| t.is_ident()) {
+                err.span_suggestion(
+                    self.span,
+                    "remove this comma",
+                    String::new(),
+                    Applicability::MachineApplicable,
+                );
+            }
+        }
+        err
+    }
+    pub fn parse_ident(&mut self) -> PResult<'a, ast::Ident> {
+        self.parse_ident_common(true)
+    }
+    fn parse_ident_common(&mut self, recover: bool) -> PResult<'a, ast::Ident> {
+        match self.token {
+            token::Ident(ident, _) => {
+                if self.token.is_reserved_ident() {
+                    let mut err = self.expected_ident_found();
+                    if recover {
+                        err.emit();
+                    } else {
+                        return Err(err);
+                    }
+                }
+                let span = self.span;
+                self.bump();
+                Ok(Ident::new(ident.name, span))
+            }
+            _ => {
+                Err(if self.prev_token_kind == PrevTokenKind::DocComment {
+                        self.span_fatal_err(self.prev_span, Error::UselessDocComment)
+                    } else {
+                        self.expected_ident_found()
+                    })
+            }
+        }
+    }
+    /// Checks if the next token is `tok`, and returns `true` if so.
+    ///
+    /// This method will automatically add `tok` to `expected_tokens` if `tok` is not
+    /// encountered.
+    crate fn check(&mut self, tok: &token::Token) -> bool {
+        let is_present = self.token == *tok;
+        if !is_present { self.expected_tokens.push(TokenType::Token(tok.clone())); }
+        is_present
+    }
+    /// Consumes a token 'tok' if it exists. Returns whether the given token was present.
+    pub fn eat(&mut self, tok: &token::Token) -> bool {
+        let is_present = self.check(tok);
+        if is_present { self.bump() }
+        is_present
+    }
+    fn check_keyword(&mut self, kw: keywords::Keyword) -> bool {
+        self.expected_tokens.push(TokenType::Keyword(kw));
+        self.token.is_keyword(kw)
+    }
+    /// If the next token is the given keyword, eats it and returns
+    /// `true`. Otherwise, returns `false`.
+    pub fn eat_keyword(&mut self, kw: keywords::Keyword) -> bool {
+        if self.check_keyword(kw) {
+            self.bump();
+            true
+        } else {
+            false
+        }
+    }
+    fn eat_keyword_noexpect(&mut self, kw: keywords::Keyword) -> bool {
+        if self.token.is_keyword(kw) {
+            self.bump();
+            true
+        } else {
+            false
+        }
+    }
+    /// If the given word is not a keyword, signals an error.
+    /// If the next token is not the given word, signals an error.
+    /// Otherwise, eats it.
+    fn expect_keyword(&mut self, kw: keywords::Keyword) -> PResult<'a, ()> {
+        if !self.eat_keyword(kw) {
+            self.unexpected()
+        } else {
+            Ok(())
+        }
+    }
+    fn check_ident(&mut self) -> bool {
+        if self.token.is_ident() {
+            true
+        } else {
+            self.expected_tokens.push(TokenType::Ident);
+            false
+        }
+    }
+    fn check_path(&mut self) -> bool {
+        if self.token.is_path_start() {
+            true
+        } else {
+            self.expected_tokens.push(TokenType::Path);
+            false
+        }
+    }
+    fn check_type(&mut self) -> bool {
+        if self.token.can_begin_type() {
+            true
+        } else {
+            self.expected_tokens.push(TokenType::Type);
+            false
+        }
+    }
+    fn check_const_arg(&mut self) -> bool {
+        if self.token.can_begin_const_arg() {
+            true
+        } else {
+            self.expected_tokens.push(TokenType::Const);
+            false
+        }
+    }
+    /// Expects and consumes a `+`. if `+=` is seen, replaces it with a `=`
+    /// and continues. If a `+` is not seen, returns `false`.
+    ///
+    /// This is used when token-splitting `+=` into `+`.
+    /// See issue #47856 for an example of when this may occur.
+    fn eat_plus(&mut self) -> bool {
+        self.expected_tokens.push(TokenType::Token(token::BinOp(token::Plus)));
+        match self.token {
+            token::BinOp(token::Plus) => {
+                self.bump();
+                true
+            }
+            token::BinOpEq(token::Plus) => {
+                let span = self.span.with_lo(self.span.lo() + BytePos(1));
+                self.bump_with(token::Eq, span);
+                true
+            }
+            _ => false,
+        }
+    }
+    /// Checks to see if the next token is either `+` or `+=`.
+    /// Otherwise returns `false`.
+    fn check_plus(&mut self) -> bool {
+        if self.token.is_like_plus() {
+            true
+        }
+        else {
+            self.expected_tokens.push(TokenType::Token(token::BinOp(token::Plus)));
+            false
+        }
+    }
+    /// Expects and consumes an `&`. If `&&` is seen, replaces it with a single
+    /// `&` and continues. If an `&` is not seen, signals an error.
+    fn expect_and(&mut self) -> PResult<'a, ()> {
+        self.expected_tokens.push(TokenType::Token(token::BinOp(token::And)));
+        match self.token {
+            token::BinOp(token::And) => {
+                self.bump();
+                Ok(())
+            }
+            token::AndAnd => {
+                let span = self.span.with_lo(self.span.lo() + BytePos(1));
+                Ok(self.bump_with(token::BinOp(token::And), span))
+            }
+            _ => self.unexpected()
+        }
+    }
+    /// Expects and consumes an `|`. If `||` is seen, replaces it with a single
+    /// `|` and continues. If an `|` is not seen, signals an error.
+    fn expect_or(&mut self) -> PResult<'a, ()> {
+        self.expected_tokens.push(TokenType::Token(token::BinOp(token::Or)));
+        match self.token {
+            token::BinOp(token::Or) => {
+                self.bump();
+                Ok(())
+            }
+            token::OrOr => {
+                let span = self.span.with_lo(self.span.lo() + BytePos(1));
+                Ok(self.bump_with(token::BinOp(token::Or), span))
+            }
+            _ => self.unexpected()
+        }
+    }
+    fn expect_no_suffix(&self, sp: Span, kind: &str, suffix: Option<ast::Name>) {
+        match suffix {
+            None => {/* everything ok */}
+            Some(suf) => {
+                let text = suf.as_str();
+                if text.is_empty() {
+                    self.span_bug(sp, "found empty literal suffix in Some")
+                }
+                let msg = format!("{} with a suffix is invalid", kind);
+                self.struct_span_err(sp, &msg)
+                    .span_label(sp, msg)
+                    .emit();
+            }
+        }
+    }
+    /// Attempts to consume a `<`. If `<<` is seen, replaces it with a single
+    /// `<` and continue. If `<-` is seen, replaces it with a single `<`
+    /// and continue. If a `<` is not seen, returns false.
+    ///
+    /// This is meant to be used when parsing generics on a path to get the
+    /// starting token.
+    fn eat_lt(&mut self) -> bool {
+        self.expected_tokens.push(TokenType::Token(token::Lt));
+        let ate = match self.token {
+            token::Lt => {
+                self.bump();
+                true
+            }
+            token::BinOp(token::Shl) => {
+                let span = self.span.with_lo(self.span.lo() + BytePos(1));
+                self.bump_with(token::Lt, span);
+                true
+            }
+            token::LArrow => {
+                let span = self.span.with_lo(self.span.lo() + BytePos(1));
+                self.bump_with(token::BinOp(token::Minus), span);
+                true
+            }
+            _ => false,
+        };
+        if ate {
+            // See doc comment for `unmatched_angle_bracket_count`.
+            self.unmatched_angle_bracket_count += 1;
+            self.max_angle_bracket_count += 1;
+            debug!("eat_lt: (increment) count={:?}", self.unmatched_angle_bracket_count);
+        }
+        ate
+    }
+    fn expect_lt(&mut self) -> PResult<'a, ()> {
+        if !self.eat_lt() {
+            self.unexpected()
+        } else {
+            Ok(())
+        }
+    }
+    /// Expects and consumes a single `>` token. if a `>>` is seen, replaces it
+    /// with a single `>` and continues. If a `>` is not seen, signals an error.
+    fn expect_gt(&mut self) -> PResult<'a, ()> {
+        self.expected_tokens.push(TokenType::Token(token::Gt));
+        let ate = match self.token {
+            token::Gt => {
+                self.bump();
+                Some(())
+            }
+            token::BinOp(token::Shr) => {
+                let span = self.span.with_lo(self.span.lo() + BytePos(1));
+                Some(self.bump_with(token::Gt, span))
+            }
+            token::BinOpEq(token::Shr) => {
+                let span = self.span.with_lo(self.span.lo() + BytePos(1));
+                Some(self.bump_with(token::Ge, span))
+            }
+            token::Ge => {
+                let span = self.span.with_lo(self.span.lo() + BytePos(1));
+                Some(self.bump_with(token::Eq, span))
+            }
+            _ => None,
+        };
+        match ate {
+            Some(_) => {
+                // See doc comment for `unmatched_angle_bracket_count`.
+                if self.unmatched_angle_bracket_count > 0 {
+                    self.unmatched_angle_bracket_count -= 1;
+                    debug!("expect_gt: (decrement) count={:?}", self.unmatched_angle_bracket_count);
+                }
+                Ok(())
+            },
+            None => self.unexpected(),
+        }
+    }
+    /// Eats and discards tokens until one of `kets` is encountered. Respects token trees,
+    /// passes through any errors encountered. Used for error recovery.
+    fn eat_to_tokens(&mut self, kets: &[&token::Token]) {
+        let handler = self.diagnostic();
+        if let Err(ref mut err) = self.parse_seq_to_before_tokens(kets,
+                                                                  SeqSep::none(),
+                                                                  TokenExpectType::Expect,
+                                                                  |p| Ok(p.parse_token_tree())) {
+            handler.cancel(err);
+        }
+    }
+    /// Parses a sequence, including the closing delimiter. The function
+    /// `f` must consume tokens until reaching the next separator or
+    /// closing bracket.
+    pub fn parse_seq_to_end<T, F>(&mut self,
+                                  ket: &token::Token,
+                                  sep: SeqSep,
+                                  f: F)
+                                  -> PResult<'a, Vec<T>> where
+        F: FnMut(&mut Parser<'a>) -> PResult<'a,  T>,
+    {
+        let (val, recovered) = self.parse_seq_to_before_end(ket, sep, f)?;
+        if !recovered {
+            self.bump();
+        }
+        Ok(val)
+    }
+    /// Parses a sequence, not including the closing delimiter. The function
+    /// `f` must consume tokens until reaching the next separator or
+    /// closing bracket.
+    pub fn parse_seq_to_before_end<T, F>(
+        &mut self,
+        ket: &token::Token,
+        sep: SeqSep,
+        f: F,
+    ) -> PResult<'a, (Vec<T>, bool)>
+        where F: FnMut(&mut Parser<'a>) -> PResult<'a, T>
+    {
+        self.parse_seq_to_before_tokens(&[ket], sep, TokenExpectType::Expect, f)
+    }
+    fn parse_seq_to_before_tokens<T, F>(
+        &mut self,
+        kets: &[&token::Token],
+        sep: SeqSep,
+        expect: TokenExpectType,
+        mut f: F,
+    ) -> PResult<'a, (Vec<T>, bool /* recovered */)>
+        where F: FnMut(&mut Parser<'a>) -> PResult<'a, T>
+    {
+        let mut first = true;
+        let mut recovered = false;
+        let mut v = vec![];
+        while !kets.iter().any(|k| {
+                match expect {
+                    TokenExpectType::Expect => self.check(k),
+                    TokenExpectType::NoExpect => self.token == **k,
+                }
+            }) {
+            match self.token {
+                token::CloseDelim(..) | token::Eof => break,
+                _ => {}
+            };
+            if let Some(ref t) = sep.sep {
+                if first {
+                    first = false;
+                } else {
+                    match self.expect(t) {
+                        Ok(false) => {}
+                        Ok(true) => {
+                            recovered = true;
+                            break;
+                        }
+                        Err(mut e) => {
+                            // Attempt to keep parsing if it was a similar separator
+                            if let Some(ref tokens) = t.similar_tokens() {
+                                if tokens.contains(&self.token) {
+                                    self.bump();
+                                }
+                            }
+                            e.emit();
+                            // Attempt to keep parsing if it was an omitted separator
+                            match f(self) {
+                                Ok(t) => {
+                                    v.push(t);
+                                    continue;
+                                },
+                                Err(mut e) => {
+                                    e.cancel();
+                                    break;
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+            if sep.trailing_sep_allowed && kets.iter().any(|k| {
+                match expect {
+                    TokenExpectType::Expect => self.check(k),
+                    TokenExpectType::NoExpect => self.token == **k,
+                }
+            }) {
+                break;
+            }
+            let t = f(self)?;
+            v.push(t);
+        }
+        Ok((v, recovered))
+    }
+    /// Parses a sequence, including the closing delimiter. The function
+    /// `f` must consume tokens until reaching the next separator or
+    /// closing bracket.
+    fn parse_unspanned_seq<T, F>(
+        &mut self,
+        bra: &token::Token,
+        ket: &token::Token,
+        sep: SeqSep,
+        f: F,
+    ) -> PResult<'a, Vec<T>> where
+        F: FnMut(&mut Parser<'a>) -> PResult<'a, T>,
+    {
+        self.expect(bra)?;
+        let (result, recovered) = self.parse_seq_to_before_end(ket, sep, f)?;
+        if !recovered {
+            self.eat(ket);
+        }
+        Ok(result)
+    }
+    /// Advance the parser by one token
+    pub fn bump(&mut self) {
+        if self.prev_token_kind == PrevTokenKind::Eof {
+            // Bumping after EOF is a bad sign, usually an infinite loop.
+            self.bug("attempted to bump the parser past EOF (may be stuck in a loop)");
+        }
+        self.prev_span = self.meta_var_span.take().unwrap_or(self.span);
+        // Record last token kind for possible error recovery.
+        self.prev_token_kind = match self.token {
+            token::DocComment(..) => PrevTokenKind::DocComment,
+            token::Comma => PrevTokenKind::Comma,
+            token::BinOp(token::Plus) => PrevTokenKind::Plus,
+            token::Interpolated(..) => PrevTokenKind::Interpolated,
+            token::Eof => PrevTokenKind::Eof,
+            token::Ident(..) => PrevTokenKind::Ident,
+            _ => PrevTokenKind::Other,
+        };
+        let next = self.next_tok();
+        self.span = next.sp;
+        self.token = next.tok;
+        self.expected_tokens.clear();
+        // check after each token
+        self.process_potential_macro_variable();
+    }
+    /// Advance the parser using provided token as a next one. Use this when
+    /// consuming a part of a token. For example a single `<` from `<<`.
+    fn bump_with(&mut self, next: token::Token, span: Span) {
+        self.prev_span = self.span.with_hi(span.lo());
+        // It would be incorrect to record the kind of the current token, but
+        // fortunately for tokens currently using `bump_with`, the
+        // prev_token_kind will be of no use anyway.
+        self.prev_token_kind = PrevTokenKind::Other;
+        self.span = span;
+        self.token = next;
+        self.expected_tokens.clear();
+    }
+    pub fn look_ahead<R, F>(&self, dist: usize, f: F) -> R where
+        F: FnOnce(&token::Token) -> R,
+    {
+        if dist == 0 {
+            return f(&self.token)
+        }
+        f(&match self.token_cursor.frame.tree_cursor.look_ahead(dist - 1) {
+            Some(tree) => match tree {
+                TokenTree::Token(_, tok) => tok,
+                TokenTree::Delimited(_, delim, _) => token::OpenDelim(delim),
+            },
+            None => token::CloseDelim(self.token_cursor.frame.delim),
+        })
+    }
+    fn look_ahead_span(&self, dist: usize) -> Span {
+        if dist == 0 {
+            return self.span
+        }
+        match self.token_cursor.frame.tree_cursor.look_ahead(dist - 1) {
+            Some(TokenTree::Token(span, _)) => span,
+            Some(TokenTree::Delimited(span, ..)) => span.entire(),
+            None => self.look_ahead_span(dist - 1),
+        }
+    }
+    pub fn fatal(&self, m: &str) -> DiagnosticBuilder<'a> {
+        self.sess.span_diagnostic.struct_span_fatal(self.span, m)
+    }
+    pub fn span_fatal<S: Into<MultiSpan>>(&self, sp: S, m: &str) -> DiagnosticBuilder<'a> {
+        self.sess.span_diagnostic.struct_span_fatal(sp, m)
+    }
+    fn span_fatal_err<S: Into<MultiSpan>>(&self, sp: S, err: Error) -> DiagnosticBuilder<'a> {
+        err.span_err(sp, self.diagnostic())
+    }
+    fn bug(&self, m: &str) -> ! {
+        self.sess.span_diagnostic.span_bug(self.span, m)
+    }
+    fn span_err<S: Into<MultiSpan>>(&self, sp: S, m: &str) {
+        self.sess.span_diagnostic.span_err(sp, m)
+    }
+    fn struct_span_err<S: Into<MultiSpan>>(&self, sp: S, m: &str) -> DiagnosticBuilder<'a> {
+        self.sess.span_diagnostic.struct_span_err(sp, m)
+    }
+    crate fn span_bug<S: Into<MultiSpan>>(&self, sp: S, m: &str) -> ! {
+        self.sess.span_diagnostic.span_bug(sp, m)
+    }
+    fn cancel(&self, err: &mut DiagnosticBuilder<'_>) {
+        self.sess.span_diagnostic.cancel(err)
+    }
+    crate fn diagnostic(&self) -> &'a errors::Handler {
+        &self.sess.span_diagnostic
+    }
+    /// Is the current token one of the keywords that signals a bare function type?
+    fn token_is_bare_fn_keyword(&mut self) -> bool {
+        self.check_keyword(keywords::Fn) ||
+            self.check_keyword(keywords::Unsafe) ||
+            self.check_keyword(keywords::Extern)
+    }
+    /// Parses a `TyKind::BareFn` type.
+    fn parse_ty_bare_fn(&mut self, generic_params: Vec<GenericParam>) -> PResult<'a, TyKind> {
+        /*
+        [unsafe] [extern "ABI"] fn (S) -> T
+         ^~~~^           ^~~~^     ^~^    ^
+           |               |        |     |
+           |               |        |   Return type
+           |               |      Argument types
+           |               |
+           |              ABI
+        Function Style
+        */
+        let unsafety = self.parse_unsafety();
+        let abi = if self.eat_keyword(keywords::Extern) {
+            self.parse_opt_abi()?.unwrap_or(Abi::C)
+        } else {
+            Abi::Rust
+        };
+        self.expect_keyword(keywords::Fn)?;
+        let (inputs, variadic) = self.parse_fn_args(false, true)?;
+        let ret_ty = self.parse_ret_ty(false)?;
+        let decl = P(FnDecl {
+            inputs,
+            output: ret_ty,
+            variadic,
+        });
+        Ok(TyKind::BareFn(P(BareFnTy {
+            abi,
+            unsafety,
+            generic_params,
+            decl,
+        })))
+    }
+    /// Parses asyncness: `async` or nothing.
+    fn parse_asyncness(&mut self) -> IsAsync {
+        if self.eat_keyword(keywords::Async) {
+            IsAsync::Async {
+                closure_id: ast::DUMMY_NODE_ID,
+                return_impl_trait_id: ast::DUMMY_NODE_ID,
+            }
+        } else {
+            IsAsync::NotAsync
+        }
+    }
+    /// Parses unsafety: `unsafe` or nothing.
+    fn parse_unsafety(&mut self) -> Unsafety {
+        if self.eat_keyword(keywords::Unsafe) {
+            Unsafety::Unsafe
+        } else {
+            Unsafety::Normal
+        }
+    }
+    /// Parses the items in a trait declaration.
+    pub fn parse_trait_item(&mut self, at_end: &mut bool) -> PResult<'a, TraitItem> {
+        maybe_whole!(self, NtTraitItem, |x| x);
+        let attrs = self.parse_outer_attributes()?;
+        let (mut item, tokens) = self.collect_tokens(|this| {
+            this.parse_trait_item_(at_end, attrs)
+        })?;
+        // See `parse_item` for why this clause is here.
+        if !item.attrs.iter().any(|attr| attr.style == AttrStyle::Inner) {
+            item.tokens = Some(tokens);
+        }
+        Ok(item)
+    }
+    fn parse_trait_item_(&mut self,
+                         at_end: &mut bool,
+                         mut attrs: Vec<Attribute>) -> PResult<'a, TraitItem> {
+        let lo = self.span;
+        let (name, node, generics) = if self.eat_keyword(keywords::Type) {
+            self.parse_trait_item_assoc_ty()?
+        } else if self.is_const_item() {
+            self.expect_keyword(keywords::Const)?;
+            let ident = self.parse_ident()?;
+            self.expect(&token::Colon)?;
+            let ty = self.parse_ty()?;
+            let default = if self.eat(&token::Eq) {
+                let expr = self.parse_expr()?;
+                self.expect(&token::Semi)?;
+                Some(expr)
+            } else {
+                self.expect(&token::Semi)?;
+                None
+            };
+            (ident, TraitItemKind::Const(ty, default), ast::Generics::default())
+        } else if let Some(mac) = self.parse_assoc_macro_invoc("trait", None, &mut false)? {
+            // trait item macro.
+            (keywords::Invalid.ident(), ast::TraitItemKind::Macro(mac), ast::Generics::default())
+        } else {
+            let (constness, unsafety, asyncness, abi) = self.parse_fn_front_matter()?;
+            let ident = self.parse_ident()?;
+            let mut generics = self.parse_generics()?;
+            let d = self.parse_fn_decl_with_self(|p: &mut Parser<'a>| {
+                // This is somewhat dubious; We don't want to allow
+                // argument names to be left off if there is a
+                // definition...
+                // We don't allow argument names to be left off in edition 2018.
+                p.parse_arg_general(p.span.rust_2018(), true)
+            })?;
+            generics.where_clause = self.parse_where_clause()?;
+            let sig = ast::MethodSig {
+                header: FnHeader {
+                    unsafety,
+                    constness,
+                    abi,
+                    asyncness,
+                },
+                decl: d,
+            };
+            let body = match self.token {
+                token::Semi => {
+                    self.bump();
+                    *at_end = true;
+                    debug!("parse_trait_methods(): parsing required method");
+                    None
+                }
+                token::OpenDelim(token::Brace) => {
+                    debug!("parse_trait_methods(): parsing provided method");
+                    *at_end = true;
+                    let (inner_attrs, body) = self.parse_inner_attrs_and_block()?;
+                    attrs.extend(inner_attrs.iter().cloned());
+                    Some(body)
+                }
+                token::Interpolated(ref nt) => {
+                    match **nt {
+                        token::NtBlock(..) => {
+                            *at_end = true;
+                            let (inner_attrs, body) = self.parse_inner_attrs_and_block()?;
+                            attrs.extend(inner_attrs.iter().cloned());
+                            Some(body)
+                        }
+                        _ => {
+                            let token_str = self.this_token_descr();
+                            let mut err = self.fatal(&format!("expected `;` or `{{`, found {}",
+                                                              token_str));
+                            err.span_label(self.span, "expected `;` or `{`");
+                            return Err(err);
+                        }
+                    }
+                }
+                _ => {
+                    let token_str = self.this_token_descr();
+                    let mut err = self.fatal(&format!("expected `;` or `{{`, found {}",
+                                                      token_str));
+                    err.span_label(self.span, "expected `;` or `{`");
+                    return Err(err);
+                }
+            };
+            (ident, ast::TraitItemKind::Method(sig, body), generics)
+        };
+        Ok(TraitItem {
+            id: ast::DUMMY_NODE_ID,
+            ident: name,
+            attrs,
+            generics,
+            node,
+            span: lo.to(self.prev_span),
+            tokens: None,
+        })
+    }
+    /// Parses an optional return type `[ -> TY ]` in a function declaration.
+    fn parse_ret_ty(&mut self, allow_plus: bool) -> PResult<'a, FunctionRetTy> {
+        if self.eat(&token::RArrow) {
+            Ok(FunctionRetTy::Ty(self.parse_ty_common(allow_plus, true)?))
+        } else {
+            Ok(FunctionRetTy::Default(self.span.shrink_to_lo()))
+        }
+    }
+    /// Parses a type.
+    pub fn parse_ty(&mut self) -> PResult<'a, P<Ty>> {
+        self.parse_ty_common(true, true)
+    }
+    /// Parses a type in restricted contexts where `+` is not permitted.
+    ///
+    /// Example 1: `&'a TYPE`
+    ///     `+` is prohibited to maintain operator priority (P(+) < P(&)).
+    /// Example 2: `value1 as TYPE + value2`
+    ///     `+` is prohibited to avoid interactions with expression grammar.
+    fn parse_ty_no_plus(&mut self) -> PResult<'a, P<Ty>> {
+        self.parse_ty_common(false, true)
+    }
+    fn parse_ty_common(&mut self, allow_plus: bool, allow_qpath_recovery: bool)
+                       -> PResult<'a, P<Ty>> {
+        maybe_whole!(self, NtTy, |x| x);
+        let lo = self.span;
+        let mut impl_dyn_multi = false;
+        let node = if self.eat(&token::OpenDelim(token::Paren)) {
+            // `(TYPE)` is a parenthesized type.
+            // `(TYPE,)` is a tuple with a single field of type TYPE.
+            let mut ts = vec![];
+            let mut last_comma = false;
+            while self.token != token::CloseDelim(token::Paren) {
+                ts.push(self.parse_ty()?);
+                if self.eat(&token::Comma) {
+                    last_comma = true;
+                } else {
+                    last_comma = false;
+                    break;
+                }
+            }
+            let trailing_plus = self.prev_token_kind == PrevTokenKind::Plus;
+            self.expect(&token::CloseDelim(token::Paren))?;
+            if ts.len() == 1 && !last_comma {
+                let ty = ts.into_iter().nth(0).unwrap().into_inner();
+                let maybe_bounds = allow_plus && self.token.is_like_plus();
+                match ty.node {
+                    // `(TY_BOUND_NOPAREN) + BOUND + ...`.
+                    TyKind::Path(None, ref path) if maybe_bounds => {
+                        self.parse_remaining_bounds(Vec::new(), path.clone(), lo, true)?
+                    }
+                    TyKind::TraitObject(ref bounds, TraitObjectSyntax::None)
+                            if maybe_bounds && bounds.len() == 1 && !trailing_plus => {
+                        let path = match bounds[0] {
+                            GenericBound::Trait(ref pt, ..) => pt.trait_ref.path.clone(),
+                            GenericBound::Outlives(..) => self.bug("unexpected lifetime bound"),
+                        };
+                        self.parse_remaining_bounds(Vec::new(), path, lo, true)?
+                    }
+                    // `(TYPE)`
+                    _ => TyKind::Paren(P(ty))
+                }
+            } else {
+                TyKind::Tup(ts)
+            }
+        } else if self.eat(&token::Not) {
+            // Never type `!`
+            TyKind::Never
+        } else if self.eat(&token::BinOp(token::Star)) {
+            // Raw pointer
+            TyKind::Ptr(self.parse_ptr()?)
+        } else if self.eat(&token::OpenDelim(token::Bracket)) {
+            // Array or slice
+            let t = self.parse_ty()?;
+            // Parse optional `; EXPR` in `[TYPE; EXPR]`
+            let t = match self.maybe_parse_fixed_length_of_vec()? {
+                None => TyKind::Slice(t),
+                Some(length) => TyKind::Array(t, AnonConst {
+                    id: ast::DUMMY_NODE_ID,
+                    value: length,
+                }),
+            };
+            self.expect(&token::CloseDelim(token::Bracket))?;
+            t
+        } else if self.check(&token::BinOp(token::And)) || self.check(&token::AndAnd) {
+            // Reference
+            self.expect_and()?;
+            self.parse_borrowed_pointee()?
+        } else if self.eat_keyword_noexpect(keywords::Typeof) {
+            // `typeof(EXPR)`
+            // In order to not be ambiguous, the type must be surrounded by parens.
+            self.expect(&token::OpenDelim(token::Paren))?;
+            let e = AnonConst {
+                id: ast::DUMMY_NODE_ID,
+                value: self.parse_expr()?,
+            };
+            self.expect(&token::CloseDelim(token::Paren))?;
+            TyKind::Typeof(e)
+        } else if self.eat_keyword(keywords::Underscore) {
+            // A type to be inferred `_`
+            TyKind::Infer
+        } else if self.token_is_bare_fn_keyword() {
+            // Function pointer type
+            self.parse_ty_bare_fn(Vec::new())?
+        } else if self.check_keyword(keywords::For) {
+            // Function pointer type or bound list (trait object type) starting with a poly-trait.
+            //   `for<'lt> [unsafe] [extern "ABI"] fn (&'lt S) -> T`
+            //   `for<'lt> Trait1<'lt> + Trait2 + 'a`
+            let lo = self.span;
+            let lifetime_defs = self.parse_late_bound_lifetime_defs()?;
+            if self.token_is_bare_fn_keyword() {
+                self.parse_ty_bare_fn(lifetime_defs)?
+            } else {
+                let path = self.parse_path(PathStyle::Type)?;
+                let parse_plus = allow_plus && self.check_plus();
+                self.parse_remaining_bounds(lifetime_defs, path, lo, parse_plus)?
+            }
+        } else if self.eat_keyword(keywords::Impl) {
+            // Always parse bounds greedily for better error recovery.
+            let bounds = self.parse_generic_bounds(None)?;
+            impl_dyn_multi = bounds.len() > 1 || self.prev_token_kind == PrevTokenKind::Plus;
+            TyKind::ImplTrait(ast::DUMMY_NODE_ID, bounds)
+        } else if self.check_keyword(keywords::Dyn) &&
+                  (self.span.rust_2018() ||
+                   self.look_ahead(1, |t| t.can_begin_bound() &&
+                                          !can_continue_type_after_non_fn_ident(t))) {
+            self.bump(); // `dyn`
+            // Always parse bounds greedily for better error recovery.
+            let bounds = self.parse_generic_bounds(None)?;
+            impl_dyn_multi = bounds.len() > 1 || self.prev_token_kind == PrevTokenKind::Plus;
+            TyKind::TraitObject(bounds, TraitObjectSyntax::Dyn)
+        } else if self.check(&token::Question) ||
+                  self.check_lifetime() && self.look_ahead(1, |t| t.is_like_plus()) {
+            // Bound list (trait object type)
+            TyKind::TraitObject(self.parse_generic_bounds_common(allow_plus, None)?,
+                                TraitObjectSyntax::None)
+        } else if self.eat_lt() {
+            // Qualified path
+            let (qself, path) = self.parse_qpath(PathStyle::Type)?;
+            TyKind::Path(Some(qself), path)
+        } else if self.token.is_path_start() {
+            // Simple path
+            let path = self.parse_path(PathStyle::Type)?;
+            if self.eat(&token::Not) {
+                // Macro invocation in type position
+                let (delim, tts) = self.expect_delimited_token_tree()?;
+                let node = Mac_ { path, tts, delim };
+                TyKind::Mac(respan(lo.to(self.prev_span), node))
+            } else {
+                // Just a type path or bound list (trait object type) starting with a trait.
+                //   `Type`
+                //   `Trait1 + Trait2 + 'a`
+                if allow_plus && self.check_plus() {
+                    self.parse_remaining_bounds(Vec::new(), path, lo, true)?
+                } else {
+                    TyKind::Path(None, path)
+                }
+            }
+        } else {
+            let msg = format!("expected type, found {}", self.this_token_descr());
+            return Err(self.fatal(&msg));
+        };
+        let span = lo.to(self.prev_span);
+        let ty = Ty { node, span, id: ast::DUMMY_NODE_ID };
+        // Try to recover from use of `+` with incorrect priority.
+        self.maybe_report_ambiguous_plus(allow_plus, impl_dyn_multi, &ty);
+        self.maybe_recover_from_bad_type_plus(allow_plus, &ty)?;
+        let ty = self.maybe_recover_from_bad_qpath(ty, allow_qpath_recovery)?;
+        Ok(P(ty))
+    }
+    fn parse_remaining_bounds(&mut self, generic_params: Vec<GenericParam>, path: ast::Path,
+                              lo: Span, parse_plus: bool) -> PResult<'a, TyKind> {
+        let poly_trait_ref = PolyTraitRef::new(generic_params, path, lo.to(self.prev_span));
+        let mut bounds = vec![GenericBound::Trait(poly_trait_ref, TraitBoundModifier::None)];
+        if parse_plus {
+            self.eat_plus(); // `+`, or `+=` gets split and `+` is discarded
+            bounds.append(&mut self.parse_generic_bounds(None)?);
+        }
+        Ok(TyKind::TraitObject(bounds, TraitObjectSyntax::None))
+    }
+    fn maybe_report_ambiguous_plus(&mut self, allow_plus: bool, impl_dyn_multi: bool, ty: &Ty) {
+        if !allow_plus && impl_dyn_multi {
+            let sum_with_parens = format!("({})", pprust::ty_to_string(&ty));
+            self.struct_span_err(ty.span, "ambiguous `+` in a type")
+                .span_suggestion(
+                    ty.span,
+                    "use parentheses to disambiguate",
+                    sum_with_parens,
+                    Applicability::MachineApplicable
+                ).emit();
+        }
+    }
+    fn maybe_recover_from_bad_type_plus(&mut self, allow_plus: bool, ty: &Ty) -> PResult<'a, ()> {
+        // Do not add `+` to expected tokens.
+        if !allow_plus || !self.token.is_like_plus() {
+            return Ok(())
+        }
+        self.bump(); // `+`
+        let bounds = self.parse_generic_bounds(None)?;
+        let sum_span = ty.span.to(self.prev_span);
+        let mut err = struct_span_err!(self.sess.span_diagnostic, sum_span, E0178,
+            "expected a path on the left-hand side of `+`, not `{}`", pprust::ty_to_string(ty));
+        match ty.node {
+            TyKind::Rptr(ref lifetime, ref mut_ty) => {
+                let sum_with_parens = pprust::to_string(|s| {
+                    use crate::print::pprust::PrintState;
+                    s.s.word("&")?;
+                    s.print_opt_lifetime(lifetime)?;
+                    s.print_mutability(mut_ty.mutbl)?;
+                    s.popen()?;
+                    s.print_type(&mut_ty.ty)?;
+                    s.print_type_bounds(" +", &bounds)?;
+                    s.pclose()
+                });
+                err.span_suggestion(
+                    sum_span,
+                    "try adding parentheses",
+                    sum_with_parens,
+                    Applicability::MachineApplicable
+                );
+            }
+            TyKind::Ptr(..) | TyKind::BareFn(..) => {
+                err.span_label(sum_span, "perhaps you forgot parentheses?");
+            }
+            _ => {
+                err.span_label(sum_span, "expected a path");
+            },
+        }
+        err.emit();
+        Ok(())
+    }
+    // Try to recover from associated item paths like `[T]::AssocItem`/`(T, U)::AssocItem`.
+    fn maybe_recover_from_bad_qpath<T: RecoverQPath>(&mut self, base: T, allow_recovery: bool)
+                                                     -> PResult<'a, T> {
+        // Do not add `::` to expected tokens.
+        if !allow_recovery || self.token != token::ModSep {
+            return Ok(base);
+        }
+        let ty = match base.to_ty() {
+            Some(ty) => ty,
+            None => return Ok(base),
+        };
+        self.bump(); // `::`
+        let mut segments = Vec::new();
+        self.parse_path_segments(&mut segments, T::PATH_STYLE, true)?;
+        let span = ty.span.to(self.prev_span);
+        let path_span = span.to(span); // use an empty path since `position` == 0
+        let recovered = base.to_recovered(
+            Some(QSelf { ty, path_span, position: 0 }),
+            ast::Path { segments, span },
+        );
+        self.diagnostic()
+            .struct_span_err(span, "missing angle brackets in associated item path")
+            .span_suggestion( // this is a best-effort recovery
+                span, "try", recovered.to_string(), Applicability::MaybeIncorrect
+            ).emit();
+        Ok(recovered)
+    }
+    fn parse_borrowed_pointee(&mut self) -> PResult<'a, TyKind> {
+        let opt_lifetime = if self.check_lifetime() { Some(self.expect_lifetime()) } else { None };
+        let mutbl = self.parse_mutability();
+        let ty = self.parse_ty_no_plus()?;
+        return Ok(TyKind::Rptr(opt_lifetime, MutTy { ty: ty, mutbl: mutbl }));
+    }
+    fn parse_ptr(&mut self) -> PResult<'a, MutTy> {
+        let mutbl = if self.eat_keyword(keywords::Mut) {
+            Mutability::Mutable
+        } else if self.eat_keyword(keywords::Const) {
+            Mutability::Immutable
+        } else {
+            let span = self.prev_span;
+            let msg = "expected mut or const in raw pointer type";
+            self.struct_span_err(span, msg)
+                .span_label(span, msg)
+                .help("use `*mut T` or `*const T` as appropriate")
+                .emit();
+            Mutability::Immutable
+        };
+        let t = self.parse_ty_no_plus()?;
+        Ok(MutTy { ty: t, mutbl: mutbl })
+    }
+    fn is_named_argument(&mut self) -> bool {
+        let offset = match self.token {
+            token::Interpolated(ref nt) => match **nt {
+                token::NtPat(..) => return self.look_ahead(1, |t| t == &token::Colon),
+                _ => 0,
+            }
+            token::BinOp(token::And) | token::AndAnd => 1,
+            _ if self.token.is_keyword(keywords::Mut) => 1,
+            _ => 0,
+        };
+        self.look_ahead(offset, |t| t.is_ident()) &&
+        self.look_ahead(offset + 1, |t| t == &token::Colon)
+    }
+    /// Skips unexpected attributes and doc comments in this position and emits an appropriate
+    /// error.
+    fn eat_incorrect_doc_comment(&mut self, applied_to: &str) {
+        if let token::DocComment(_) = self.token {
+            let mut err = self.diagnostic().struct_span_err(
+                self.span,
+                &format!("documentation comments cannot be applied to {}", applied_to),
+            );
+            err.span_label(self.span, "doc comments are not allowed here");
+            err.emit();
+            self.bump();
+        } else if self.token == token::Pound && self.look_ahead(1, |t| {
+            *t == token::OpenDelim(token::Bracket)
+        }) {
+            let lo = self.span;
+            // Skip every token until next possible arg.
+            while self.token != token::CloseDelim(token::Bracket) {
+                self.bump();
+            }
+            let sp = lo.to(self.span);
+            self.bump();
+            let mut err = self.diagnostic().struct_span_err(
+                sp,
+                &format!("attributes cannot be applied to {}", applied_to),
+            );
+            err.span_label(sp, "attributes are not allowed here");
+            err.emit();
+        }
+    }
+    /// This version of parse arg doesn't necessarily require identifier names.
+    fn parse_arg_general(&mut self, require_name: bool, is_trait_item: bool) -> PResult<'a, Arg> {
+        maybe_whole!(self, NtArg, |x| x);
+        if let Ok(Some(_)) = self.parse_self_arg() {
+            let mut err = self.struct_span_err(self.prev_span,
+                "unexpected `self` argument in function");
+            err.span_label(self.prev_span,
+                "`self` is only valid as the first argument of an associated function");
+            return Err(err);
+        }
+        let (pat, ty) = if require_name || self.is_named_argument() {
+            debug!("parse_arg_general parse_pat (require_name:{})",
+                   require_name);
+            self.eat_incorrect_doc_comment("method arguments");
+            let pat = self.parse_pat(Some("argument name"))?;
+            if let Err(mut err) = self.expect(&token::Colon) {
+                // If we find a pattern followed by an identifier, it could be an (incorrect)
+                // C-style parameter declaration.
+                if self.check_ident() && self.look_ahead(1, |t| {
+                    *t == token::Comma || *t == token::CloseDelim(token::Paren)
+                }) {
+                    let ident = self.parse_ident().unwrap();
+                    let span = pat.span.with_hi(ident.span.hi());
+                    err.span_suggestion(
+                        span,
+                        "declare the type after the parameter binding",
+                        String::from("<identifier>: <type>"),
+                        Applicability::HasPlaceholders,
+                    );
+                } else if require_name && is_trait_item {
+                    if let PatKind::Ident(_, ident, _) = pat.node {
+                        err.span_suggestion(
+                            pat.span,
+                            "explicitly ignore parameter",
+                            format!("_: {}", ident),
+                            Applicability::MachineApplicable,
+                        );
+                    }
+                    err.note("anonymous parameters are removed in the 2018 edition (see RFC 1685)");
+                }
+                return Err(err);
+            }
+            self.eat_incorrect_doc_comment("a method argument's type");
+            (pat, self.parse_ty()?)
+        } else {
+            debug!("parse_arg_general ident_to_pat");
+            let parser_snapshot_before_ty = self.clone();
+            self.eat_incorrect_doc_comment("a method argument's type");
+            let mut ty = self.parse_ty();
+            if ty.is_ok() && self.token != token::Comma &&
+               self.token != token::CloseDelim(token::Paren) {
+                // This wasn't actually a type, but a pattern looking like a type,
+                // so we are going to rollback and re-parse for recovery.
+                ty = self.unexpected();
+            }
+            match ty {
+                Ok(ty) => {
+                    let ident = Ident::new(keywords::Invalid.name(), self.prev_span);
+                    let pat = P(Pat {
+                        id: ast::DUMMY_NODE_ID,
+                        node: PatKind::Ident(
+                            BindingMode::ByValue(Mutability::Immutable), ident, None),
+                        span: ty.span,
+                    });
+                    (pat, ty)
+                }
+                Err(mut err) => {
+                    // Recover from attempting to parse the argument as a type without pattern.
+                    err.cancel();
+                    mem::replace(self, parser_snapshot_before_ty);
+                    let pat = self.parse_pat(Some("argument name"))?;
+                    self.expect(&token::Colon)?;
+                    let ty = self.parse_ty()?;
+                    let mut err = self.diagnostic().struct_span_err_with_code(
+                        pat.span,
+                        "patterns aren't allowed in methods without bodies",
+                        DiagnosticId::Error("E0642".into()),
+                    );
+                    err.span_suggestion_short(
+                        pat.span,
+                        "give this argument a name or use an underscore to ignore it",
+                        "_".to_owned(),
+                        Applicability::MachineApplicable,
+                    );
+                    err.emit();
+                    // Pretend the pattern is `_`, to avoid duplicate errors from AST validation.
+                    let pat = P(Pat {
+                        node: PatKind::Wild,
+                        span: pat.span,
+                        id: ast::DUMMY_NODE_ID
+                    });
+                    (pat, ty)
+                }
+            }
+        };
+        Ok(Arg { ty, pat, id: ast::DUMMY_NODE_ID })
+    }
+    /// Parses a single function argument.
+    crate fn parse_arg(&mut self) -> PResult<'a, Arg> {
+        self.parse_arg_general(true, false)
+    }
+    /// Parses an argument in a lambda header (e.g., `|arg, arg|`).
+    fn parse_fn_block_arg(&mut self) -> PResult<'a, Arg> {
+        let pat = self.parse_pat(Some("argument name"))?;
+        let t = if self.eat(&token::Colon) {
+            self.parse_ty()?
+        } else {
+            P(Ty {
+                id: ast::DUMMY_NODE_ID,
+                node: TyKind::Infer,
+                span: self.prev_span,
+            })
+        };
+        Ok(Arg {
+            ty: t,
+            pat,
+            id: ast::DUMMY_NODE_ID
+        })
+    }
+    fn maybe_parse_fixed_length_of_vec(&mut self) -> PResult<'a, Option<P<ast::Expr>>> {
+        if self.eat(&token::Semi) {
+            Ok(Some(self.parse_expr()?))
+        } else {
+            Ok(None)
+        }
+    }
+    /// Matches `token_lit = LIT_INTEGER | ...`.
+    fn parse_lit_token(&mut self) -> PResult<'a, LitKind> {
+        let out = match self.token {
+            token::Interpolated(ref nt) => match **nt {
+                token::NtExpr(ref v) | token::NtLiteral(ref v) => match v.node {
+                    ExprKind::Lit(ref lit) => { lit.node.clone() }
+                    _ => { return self.unexpected_last(&self.token); }
+                },
+                _ => { return self.unexpected_last(&self.token); }
+            },
+            token::Literal(lit, suf) => {
+                let diag = Some((self.span, &self.sess.span_diagnostic));
+                let (suffix_illegal, result) = parse::lit_token(lit, suf, diag);
+                if suffix_illegal {
+                    let sp = self.span;
+                    self.expect_no_suffix(sp, lit.literal_name(), suf)
+                }
+                result.unwrap()
+            }
+            token::Dot if self.look_ahead(1, |t| match t {
+                token::Literal(parse::token::Lit::Integer(_) , _) => true,
+                _ => false,
+            }) => { // recover from `let x = .4;`
+                let lo = self.span;
+                self.bump();
+                if let token::Literal(
+                    parse::token::Lit::Integer(val),
+                    suffix,
+                ) = self.token {
+                    let suffix = suffix.and_then(|s| {
+                        let s = s.as_str().get();
+                        if ["f32", "f64"].contains(&s) {
+                            Some(s)
+                        } else {
+                            None
+                        }
+                    }).unwrap_or("");
+                    self.bump();
+                    let sp = lo.to(self.prev_span);
+                    let mut err = self.diagnostic()
+                        .struct_span_err(sp, "float literals must have an integer part");
+                    err.span_suggestion(
+                        sp,
+                        "must have an integer part",
+                        format!("0.{}{}", val, suffix),
+                        Applicability::MachineApplicable,
+                    );
+                    err.emit();
+                    return Ok(match suffix {
+                        "f32" => ast::LitKind::Float(val, ast::FloatTy::F32),
+                        "f64" => ast::LitKind::Float(val, ast::FloatTy::F64),
+                        _ => ast::LitKind::FloatUnsuffixed(val),
+                    });
+                } else {
+                    unreachable!();
+                };
+            }
+            _ => { return self.unexpected_last(&self.token); }
+        };
+        self.bump();
+        Ok(out)
+    }
+    /// Matches `lit = true | false | token_lit`.
+    crate fn parse_lit(&mut self) -> PResult<'a, Lit> {
+        let lo = self.span;
+        let lit = if self.eat_keyword(keywords::True) {
+            LitKind::Bool(true)
+        } else if self.eat_keyword(keywords::False) {
+            LitKind::Bool(false)
+        } else {
+            let lit = self.parse_lit_token()?;
+            lit
+        };
+        Ok(source_map::Spanned { node: lit, span: lo.to(self.prev_span) })
+    }
+    /// Matches `'-' lit | lit` (cf. `ast_validation::AstValidator::check_expr_within_pat`).
+    crate fn parse_literal_maybe_minus(&mut self) -> PResult<'a, P<Expr>> {
+        maybe_whole_expr!(self);
+        let minus_lo = self.span;
+        let minus_present = self.eat(&token::BinOp(token::Minus));
+        let lo = self.span;
+        let literal = self.parse_lit()?;
+        let hi = self.prev_span;
+        let expr = self.mk_expr(lo.to(hi), ExprKind::Lit(literal), ThinVec::new());
+        if minus_present {
+            let minus_hi = self.prev_span;
+            let unary = self.mk_unary(UnOp::Neg, expr);
+            Ok(self.mk_expr(minus_lo.to(minus_hi), unary, ThinVec::new()))
+        } else {
+            Ok(expr)
+        }
+    }
+    fn parse_path_segment_ident(&mut self) -> PResult<'a, ast::Ident> {
+        match self.token {
+            token::Ident(ident, _) if self.token.is_path_segment_keyword() => {
+                let span = self.span;
+                self.bump();
+                Ok(Ident::new(ident.name, span))
+            }
+            _ => self.parse_ident(),
+        }
+    }
+    fn parse_ident_or_underscore(&mut self) -> PResult<'a, ast::Ident> {
+        match self.token {
+            token::Ident(ident, false) if ident.name == keywords::Underscore.name() => {
+                let span = self.span;
+                self.bump();
+                Ok(Ident::new(ident.name, span))
+            }
+            _ => self.parse_ident(),
+        }
+    }
+    /// Parses a qualified path.
+    /// Assumes that the leading `<` has been parsed already.
+    ///
+    /// `qualified_path = <type [as trait_ref]>::path`
+    ///
+    /// # Examples
+    /// `<T>::default`
+    /// `<T as U>::a`
+    /// `<T as U>::F::a<S>` (without disambiguator)
+    /// `<T as U>::F::a::<S>` (with disambiguator)
+    fn parse_qpath(&mut self, style: PathStyle) -> PResult<'a, (QSelf, ast::Path)> {
+        let lo = self.prev_span;
+        let ty = self.parse_ty()?;
+        // `path` will contain the prefix of the path up to the `>`,
+        // if any (e.g., `U` in the `<T as U>::*` examples
+        // above). `path_span` has the span of that path, or an empty
+        // span in the case of something like `<T>::Bar`.
+        let (mut path, path_span);
+        if self.eat_keyword(keywords::As) {
+            let path_lo = self.span;
+            path = self.parse_path(PathStyle::Type)?;
+            path_span = path_lo.to(self.prev_span);
+        } else {
+            path = ast::Path { segments: Vec::new(), span: syntax_pos::DUMMY_SP };
+            path_span = self.span.to(self.span);
+        }
+        // See doc comment for `unmatched_angle_bracket_count`.
+        self.expect(&token::Gt)?;
+        if self.unmatched_angle_bracket_count > 0 {
+            self.unmatched_angle_bracket_count -= 1;
+            debug!("parse_qpath: (decrement) count={:?}", self.unmatched_angle_bracket_count);
+        }
+        self.expect(&token::ModSep)?;
+        let qself = QSelf { ty, path_span, position: path.segments.len() };
+        self.parse_path_segments(&mut path.segments, style, true)?;
+        Ok((qself, ast::Path { segments: path.segments, span: lo.to(self.prev_span) }))
+    }
+    /// Parses simple paths.
+    ///
+    /// `path = [::] segment+`
+    /// `segment = ident | ident[::]<args> | ident[::](args) [-> type]`
+    ///
+    /// # Examples
+    /// `a::b::C<D>` (without disambiguator)
+    /// `a::b::C::<D>` (with disambiguator)
+    /// `Fn(Args)` (without disambiguator)
+    /// `Fn::(Args)` (with disambiguator)
+    pub fn parse_path(&mut self, style: PathStyle) -> PResult<'a, ast::Path> {
+        self.parse_path_common(style, true)
+    }
+    crate fn parse_path_common(&mut self, style: PathStyle, enable_warning: bool)
+                             -> PResult<'a, ast::Path> {
+        maybe_whole!(self, NtPath, |path| {
+            if style == PathStyle::Mod &&
+               path.segments.iter().any(|segment| segment.args.is_some()) {
+                self.diagnostic().span_err(path.span, "unexpected generic arguments in path");
+            }
+            path
+        });
+        let lo = self.meta_var_span.unwrap_or(self.span);
+        let mut segments = Vec::new();
+        let mod_sep_ctxt = self.span.ctxt();
+        if self.eat(&token::ModSep) {
+            segments.push(PathSegment::path_root(lo.shrink_to_lo().with_ctxt(mod_sep_ctxt)));
+        }
+        self.parse_path_segments(&mut segments, style, enable_warning)?;
+        Ok(ast::Path { segments, span: lo.to(self.prev_span) })
+    }
+    /// Like `parse_path`, but also supports parsing `Word` meta items into paths for
+    /// backwards-compatibility. This is used when parsing derive macro paths in `#[derive]`
+    /// attributes.
+    pub fn parse_path_allowing_meta(&mut self, style: PathStyle) -> PResult<'a, ast::Path> {
+        let meta_ident = match self.token {
+            token::Interpolated(ref nt) => match **nt {
+                token::NtMeta(ref meta) => match meta.node {
+                    ast::MetaItemKind::Word => Some(meta.ident.clone()),
+                    _ => None,
+                },
+                _ => None,
+            },
+            _ => None,
+        };
+        if let Some(path) = meta_ident {
+            self.bump();
+            return Ok(path);
+        }
+        self.parse_path(style)
+    }
+    fn parse_path_segments(&mut self,
+                           segments: &mut Vec<PathSegment>,
+                           style: PathStyle,
+                           enable_warning: bool)
+                           -> PResult<'a, ()> {
+        loop {
+            let segment = self.parse_path_segment(style, enable_warning)?;
+            if style == PathStyle::Expr {
+                // In order to check for trailing angle brackets, we must have finished
+                // recursing (`parse_path_segment` can indirectly call this function),
+                // that is, the next token must be the highlighted part of the below example:
+                //
+                // `Foo::<Bar as Baz<T>>::Qux`
+                //                      ^ here
+                //
+                // As opposed to the below highlight (if we had only finished the first
+                // recursion):
+                //
+                // `Foo::<Bar as Baz<T>>::Qux`
+                //                     ^ here
+                //
+                // `PathStyle::Expr` is only provided at the root invocation and never in
+                // `parse_path_segment` to recurse and therefore can be checked to maintain
+                // this invariant.
+                self.check_trailing_angle_brackets(&segment, token::ModSep);
+            }
+            segments.push(segment);
+            if self.is_import_coupler() || !self.eat(&token::ModSep) {
+                return Ok(());
+            }
+        }
+    }
+    fn parse_path_segment(&mut self, style: PathStyle, enable_warning: bool)
+                          -> PResult<'a, PathSegment> {
+        let ident = self.parse_path_segment_ident()?;
+        let is_args_start = |token: &token::Token| match *token {
+            token::Lt | token::BinOp(token::Shl) | token::OpenDelim(token::Paren) => true,
+            _ => false,
+        };
+        let check_args_start = |this: &mut Self| {
+            this.expected_tokens.extend_from_slice(
+                &[TokenType::Token(token::Lt), TokenType::Token(token::OpenDelim(token::Paren))]
+            );
+            is_args_start(&this.token)
+        };
+        Ok(if style == PathStyle::Type && check_args_start(self) ||
+              style != PathStyle::Mod && self.check(&token::ModSep)
+                                      && self.look_ahead(1, |t| is_args_start(t)) {
+            // Generic arguments are found - `<`, `(`, `::<` or `::(`.
+            if self.eat(&token::ModSep) && style == PathStyle::Type && enable_warning {
+                self.diagnostic().struct_span_warn(self.prev_span, "unnecessary path disambiguator")
+                                 .span_label(self.prev_span, "try removing `::`").emit();
+            }
+            let lo = self.span;
+            // We use `style == PathStyle::Expr` to check if this is in a recursion or not. If
+            // it isn't, then we reset the unmatched angle bracket count as we're about to start
+            // parsing a new path.
+            if style == PathStyle::Expr {
+                self.unmatched_angle_bracket_count = 0;
+                self.max_angle_bracket_count = 0;
+            }
+            let args = if self.eat_lt() {
+                // `<'a, T, A = U>`
+                let (args, bindings) =
+                    self.parse_generic_args_with_leaning_angle_bracket_recovery(style, lo)?;
+                self.expect_gt()?;
+                let span = lo.to(self.prev_span);
+                AngleBracketedArgs { args, bindings, span }.into()
+            } else {
+                // `(T, U) -> R`
+                self.bump(); // `(`
+                let (inputs, recovered) = self.parse_seq_to_before_tokens(
+                    &[&token::CloseDelim(token::Paren)],
+                    SeqSep::trailing_allowed(token::Comma),
+                    TokenExpectType::Expect,
+                    |p| p.parse_ty())?;
+                if !recovered {
+                    self.bump(); // `)`
+                }
+                let span = lo.to(self.prev_span);
+                let output = if self.eat(&token::RArrow) {
+                    Some(self.parse_ty_common(false, false)?)
+                } else {
+                    None
+                };
+                ParenthesizedArgs { inputs, output, span }.into()
+            };
+            PathSegment { ident, args, id: ast::DUMMY_NODE_ID }
+        } else {
+            // Generic arguments are not found.
+            PathSegment::from_ident(ident)
+        })
+    }
+    crate fn check_lifetime(&mut self) -> bool {
+        self.expected_tokens.push(TokenType::Lifetime);
+        self.token.is_lifetime()
+    }
+    /// Parses a single lifetime `'a` or panics.
+    crate fn expect_lifetime(&mut self) -> Lifetime {
+        if let Some(ident) = self.token.lifetime() {
+            let span = self.span;
+            self.bump();
+            Lifetime { ident: Ident::new(ident.name, span), id: ast::DUMMY_NODE_ID }
+        } else {
+            self.span_bug(self.span, "not a lifetime")
+        }
+    }
+    fn eat_label(&mut self) -> Option<Label> {
+        if let Some(ident) = self.token.lifetime() {
+            let span = self.span;
+            self.bump();
+            Some(Label { ident: Ident::new(ident.name, span) })
+        } else {
+            None
+        }
+    }
+    /// Parses mutability (`mut` or nothing).
+    fn parse_mutability(&mut self) -> Mutability {
+        if self.eat_keyword(keywords::Mut) {
+            Mutability::Mutable
+        } else {
+            Mutability::Immutable
+        }
+    }
+    fn parse_field_name(&mut self) -> PResult<'a, Ident> {
+        if let token::Literal(token::Integer(name), None) = self.token {
+            self.bump();
+            Ok(Ident::new(name, self.prev_span))
+        } else {
+            self.parse_ident_common(false)
+        }
+    }
+    /// Parse ident (COLON expr)?
+    fn parse_field(&mut self) -> PResult<'a, Field> {
+        let attrs = self.parse_outer_attributes()?;
+        let lo = self.span;
+        // Check if a colon exists one ahead. This means we're parsing a fieldname.
+        let (fieldname, expr, is_shorthand) = if self.look_ahead(1, |t| {
+            t == &token::Colon || t == &token::Eq
+        }) {
+            let fieldname = self.parse_field_name()?;
+            // Check for an equals token. This means the source incorrectly attempts to
+            // initialize a field with an eq rather than a colon.
+            if self.token == token::Eq {
+                self.diagnostic()
+                    .struct_span_err(self.span, "expected `:`, found `=`")
+                    .span_suggestion(
+                        fieldname.span.shrink_to_hi().to(self.span),
+                        "replace equals symbol with a colon",
+                        ":".to_string(),
+                        Applicability::MachineApplicable,
+                    )
+                    .emit();
+            }
+            self.bump(); // `:`
+            (fieldname, self.parse_expr()?, false)
+        } else {
+            let fieldname = self.parse_ident_common(false)?;
+            // Mimic `x: x` for the `x` field shorthand.
+            let path = ast::Path::from_ident(fieldname);
+            let expr = self.mk_expr(fieldname.span, ExprKind::Path(None, path), ThinVec::new());
+            (fieldname, expr, true)
+        };
+        Ok(ast::Field {
+            ident: fieldname,
+            span: lo.to(expr.span),
+            expr,
+            is_shorthand,
+            attrs: attrs.into(),
+        })
+    }
+    fn mk_expr(&mut self, span: Span, node: ExprKind, attrs: ThinVec<Attribute>) -> P<Expr> {
+        P(Expr { node, span, attrs, id: ast::DUMMY_NODE_ID })
+    }
+    fn mk_unary(&mut self, unop: ast::UnOp, expr: P<Expr>) -> ast::ExprKind {
+        ExprKind::Unary(unop, expr)
+    }
+    fn mk_binary(&mut self, binop: ast::BinOp, lhs: P<Expr>, rhs: P<Expr>) -> ast::ExprKind {
+        ExprKind::Binary(binop, lhs, rhs)
+    }
+    fn mk_call(&mut self, f: P<Expr>, args: Vec<P<Expr>>) -> ast::ExprKind {
+        ExprKind::Call(f, args)
+    }
+    fn mk_index(&mut self, expr: P<Expr>, idx: P<Expr>) -> ast::ExprKind {
+        ExprKind::Index(expr, idx)
+    }
+    fn mk_range(&mut self,
+                    start: Option<P<Expr>>,
+                    end: Option<P<Expr>>,
+                    limits: RangeLimits)
+                    -> PResult<'a, ast::ExprKind> {
+        if end.is_none() && limits == RangeLimits::Closed {
+            Err(self.span_fatal_err(self.span, Error::InclusiveRangeWithNoEnd))
+        } else {
+            Ok(ExprKind::Range(start, end, limits))
+        }
+    }
+    fn mk_assign_op(&mut self, binop: ast::BinOp,
+                        lhs: P<Expr>, rhs: P<Expr>) -> ast::ExprKind {
+        ExprKind::AssignOp(binop, lhs, rhs)
+    }
+    pub fn mk_mac_expr(&mut self, span: Span, m: Mac_, attrs: ThinVec<Attribute>) -> P<Expr> {
+        P(Expr {
+            id: ast::DUMMY_NODE_ID,
+            node: ExprKind::Mac(source_map::Spanned {node: m, span: span}),
+            span,
+            attrs,
+        })
+    }
+    fn expect_delimited_token_tree(&mut self) -> PResult<'a, (MacDelimiter, TokenStream)> {
+        let delim = match self.token {
+            token::OpenDelim(delim) => delim,
+            _ => {
+                let msg = "expected open delimiter";
+                let mut err = self.fatal(msg);
+                err.span_label(self.span, msg);
+                return Err(err)
+            }
+        };
+        let tts = match self.parse_token_tree() {
+            TokenTree::Delimited(_, _, tts) => tts,
+            _ => unreachable!(),
+        };
+        let delim = match delim {
+            token::Paren => MacDelimiter::Parenthesis,
+            token::Bracket => MacDelimiter::Bracket,
+            token::Brace => MacDelimiter::Brace,
+            token::NoDelim => self.bug("unexpected no delimiter"),
+        };
+        Ok((delim, tts.into()))
+    }
+    /// At the bottom (top?) of the precedence hierarchy,
+    /// Parses things like parenthesized exprs, macros, `return`, etc.
+    ///
+    /// N.B., this does not parse outer attributes, and is private because it only works
+    /// correctly if called from `parse_dot_or_call_expr()`.
+    fn parse_bottom_expr(&mut self) -> PResult<'a, P<Expr>> {
+        maybe_whole_expr!(self);
+        // Outer attributes are already parsed and will be
+        // added to the return value after the fact.
+        //
+        // Therefore, prevent sub-parser from parsing
+        // attributes by giving them a empty "already parsed" list.
+        let mut attrs = ThinVec::new();
+        let lo = self.span;
+        let mut hi = self.span;
+        let ex: ExprKind;
+        // Note: when adding new syntax here, don't forget to adjust Token::can_begin_expr().
+        match self.token {
+            token::OpenDelim(token::Paren) => {
+                self.bump();
+                attrs.extend(self.parse_inner_attributes()?);
+                // (e) is parenthesized e
+                // (e,) is a tuple with only one field, e
+                let mut es = vec![];
+                let mut trailing_comma = false;
+                let mut recovered = false;
+                while self.token != token::CloseDelim(token::Paren) {
+                    es.push(self.parse_expr()?);
+                    recovered = self.expect_one_of(
+                        &[],
+                        &[token::Comma, token::CloseDelim(token::Paren)],
+                    )?;
+                    if self.eat(&token::Comma) {
+                        trailing_comma = true;
+                    } else {
+                        trailing_comma = false;
+                        break;
+                    }
+                }
+                if !recovered {
+                    self.bump();
+                }
+                hi = self.prev_span;
+                ex = if es.len() == 1 && !trailing_comma {
+                    ExprKind::Paren(es.into_iter().nth(0).unwrap())
+                } else {
+                    ExprKind::Tup(es)
+                };
+            }
+            token::OpenDelim(token::Brace) => {
+                return self.parse_block_expr(None, lo, BlockCheckMode::Default, attrs);
+            }
+            token::BinOp(token::Or) | token::OrOr => {
+                return self.parse_lambda_expr(attrs);
+            }
+            token::OpenDelim(token::Bracket) => {
+                self.bump();
+                attrs.extend(self.parse_inner_attributes()?);
+                if self.eat(&token::CloseDelim(token::Bracket)) {
+                    // Empty vector.
+                    ex = ExprKind::Array(Vec::new());
+                } else {
+                    // Nonempty vector.
+                    let first_expr = self.parse_expr()?;
+                    if self.eat(&token::Semi) {
+                        // Repeating array syntax: [ 0; 512 ]
+                        let count = AnonConst {
+                            id: ast::DUMMY_NODE_ID,
+                            value: self.parse_expr()?,
+                        };
+                        self.expect(&token::CloseDelim(token::Bracket))?;
+                        ex = ExprKind::Repeat(first_expr, count);
+                    } else if self.eat(&token::Comma) {
+                        // Vector with two or more elements.
+                        let remaining_exprs = self.parse_seq_to_end(
+                            &token::CloseDelim(token::Bracket),
+                            SeqSep::trailing_allowed(token::Comma),
+                            |p| Ok(p.parse_expr()?)
+                        )?;
+                        let mut exprs = vec![first_expr];
+                        exprs.extend(remaining_exprs);
+                        ex = ExprKind::Array(exprs);
+                    } else {
+                        // Vector with one element.
+                        self.expect(&token::CloseDelim(token::Bracket))?;
+                        ex = ExprKind::Array(vec![first_expr]);
+                    }
+                }
+                hi = self.prev_span;
+            }
+            _ => {
+                if self.eat_lt() {
+                    let (qself, path) = self.parse_qpath(PathStyle::Expr)?;
+                    hi = path.span;
+                    return Ok(self.mk_expr(lo.to(hi), ExprKind::Path(Some(qself), path), attrs));
+                }
+                if self.span.rust_2018() && self.check_keyword(keywords::Async)
+                {
+                    if self.is_async_block() { // check for `async {` and `async move {`
+                        return self.parse_async_block(attrs);
+                    } else {
+                        return self.parse_lambda_expr(attrs);
+                    }
+                }
+                if self.check_keyword(keywords::Move) || self.check_keyword(keywords::Static) {
+                    return self.parse_lambda_expr(attrs);
+                }
+                if self.eat_keyword(keywords::If) {
+                    return self.parse_if_expr(attrs);
+                }
+                if self.eat_keyword(keywords::For) {
+                    let lo = self.prev_span;
+                    return self.parse_for_expr(None, lo, attrs);
+                }
+                if self.eat_keyword(keywords::While) {
+                    let lo = self.prev_span;
+                    return self.parse_while_expr(None, lo, attrs);
+                }
+                if let Some(label) = self.eat_label() {
+                    let lo = label.ident.span;
+                    self.expect(&token::Colon)?;
+                    if self.eat_keyword(keywords::While) {
+                        return self.parse_while_expr(Some(label), lo, attrs)
+                    }
+                    if self.eat_keyword(keywords::For) {
+                        return self.parse_for_expr(Some(label), lo, attrs)
+                    }
+                    if self.eat_keyword(keywords::Loop) {
+                        return self.parse_loop_expr(Some(label), lo, attrs)
+                    }
+                    if self.token == token::OpenDelim(token::Brace) {
+                        return self.parse_block_expr(Some(label),
+                                                     lo,
+                                                     BlockCheckMode::Default,
+                                                     attrs);
+                    }
+                    let msg = "expected `while`, `for`, `loop` or `{` after a label";
+                    let mut err = self.fatal(msg);
+                    err.span_label(self.span, msg);
+                    return Err(err);
+                }
+                if self.eat_keyword(keywords::Loop) {
+                    let lo = self.prev_span;
+                    return self.parse_loop_expr(None, lo, attrs);
+                }
+                if self.eat_keyword(keywords::Continue) {
+                    let label = self.eat_label();
+                    let ex = ExprKind::Continue(label);
+                    let hi = self.prev_span;
+                    return Ok(self.mk_expr(lo.to(hi), ex, attrs));
+                }
+                if self.eat_keyword(keywords::Match) {
+                    let match_sp = self.prev_span;
+                    return self.parse_match_expr(attrs).map_err(|mut err| {
+                        err.span_label(match_sp, "while parsing this match expression");
+                        err
+                    });
+                }
+                if self.eat_keyword(keywords::Unsafe) {
+                    return self.parse_block_expr(
+                        None,
+                        lo,
+                        BlockCheckMode::Unsafe(ast::UserProvided),
+                        attrs);
+                }
+                if self.is_do_catch_block() {
+                    let mut db = self.fatal("found removed `do catch` syntax");
+                    db.help("Following RFC #2388, the new non-placeholder syntax is `try`");
+                    return Err(db);
+                }
+                if self.is_try_block() {
+                    let lo = self.span;
+                    assert!(self.eat_keyword(keywords::Try));
+                    return self.parse_try_block(lo, attrs);
+                }
+                if self.eat_keyword(keywords::Return) {
+                    if self.token.can_begin_expr() {
+                        let e = self.parse_expr()?;
+                        hi = e.span;
+                        ex = ExprKind::Ret(Some(e));
+                    } else {
+                        ex = ExprKind::Ret(None);
+                    }
+                } else if self.eat_keyword(keywords::Break) {
+                    let label = self.eat_label();
+                    let e = if self.token.can_begin_expr()
+                               && !(self.token == token::OpenDelim(token::Brace)
+                                    && self.restrictions.contains(
+                                           Restrictions::NO_STRUCT_LITERAL)) {
+                        Some(self.parse_expr()?)
+                    } else {
+                        None
+                    };
+                    ex = ExprKind::Break(label, e);
+                    hi = self.prev_span;
+                } else if self.eat_keyword(keywords::Yield) {
+                    if self.token.can_begin_expr() {
+                        let e = self.parse_expr()?;
+                        hi = e.span;
+                        ex = ExprKind::Yield(Some(e));
+                    } else {
+                        ex = ExprKind::Yield(None);
+                    }
+                } else if self.token.is_keyword(keywords::Let) {
+                    // Catch this syntax error here, instead of in `parse_ident`, so
+                    // that we can explicitly mention that let is not to be used as an expression
+                    let mut db = self.fatal("expected expression, found statement (`let`)");
+                    db.span_label(self.span, "expected expression");
+                    db.note("variable declaration using `let` is a statement");
+                    return Err(db);
+                } else if self.token.is_path_start() {
+                    let pth = self.parse_path(PathStyle::Expr)?;
+                    // `!`, as an operator, is prefix, so we know this isn't that
+                    if self.eat(&token::Not) {
+                        // MACRO INVOCATION expression
+                        let (delim, tts) = self.expect_delimited_token_tree()?;
+                        let hi = self.prev_span;
+                        let node = Mac_ { path: pth, tts, delim };
+                        return Ok(self.mk_mac_expr(lo.to(hi), node, attrs))
+                    }
+                    if self.check(&token::OpenDelim(token::Brace)) {
+                        // This is a struct literal, unless we're prohibited
+                        // from parsing struct literals here.
+                        let prohibited = self.restrictions.contains(
+                            Restrictions::NO_STRUCT_LITERAL
+                        );
+                        if !prohibited {
+                            return self.parse_struct_expr(lo, pth, attrs);
+                        }
+                    }
+                    hi = pth.span;
+                    ex = ExprKind::Path(None, pth);
+                } else {
+                    if !self.unclosed_delims.is_empty() && self.check(&token::Semi) {
+                        // Don't complain about bare semicolons after unclosed braces
+                        // recovery in order to keep the error count down. Fixing the
+                        // delimiters will possibly also fix the bare semicolon found in
+                        // expression context. For example, silence the following error:
+                        // ```
+                        // error: expected expression, found `;`
+                        //  --> file.rs:2:13
+                        //   |
+                        // 2 |     foo(bar(;
+                        //   |             ^ expected expression
+                        // ```
+                        self.bump();
+                        return Ok(self.mk_expr(self.span, ExprKind::Err, ThinVec::new()));
+                    }
+                    match self.parse_literal_maybe_minus() {
+                        Ok(expr) => {
+                            hi = expr.span;
+                            ex = expr.node.clone();
+                        }
+                        Err(mut err) => {
+                            self.cancel(&mut err);
+                            let msg = format!("expected expression, found {}",
+                                              self.this_token_descr());
+                            let mut err = self.fatal(&msg);
+                            err.span_label(self.span, "expected expression");
+                            return Err(err);
+                        }
+                    }
+                }
+            }
+        }
+        let expr = Expr { node: ex, span: lo.to(hi), id: ast::DUMMY_NODE_ID, attrs };
+        let expr = self.maybe_recover_from_bad_qpath(expr, true)?;
+        return Ok(P(expr));
+    }
+    fn parse_struct_expr(&mut self, lo: Span, pth: ast::Path, mut attrs: ThinVec<Attribute>)
+                         -> PResult<'a, P<Expr>> {
+        let struct_sp = lo.to(self.prev_span);
+        self.bump();
+        let mut fields = Vec::new();
+        let mut base = None;
+        attrs.extend(self.parse_inner_attributes()?);
+        while self.token != token::CloseDelim(token::Brace) {
+            if self.eat(&token::DotDot) {
+                let exp_span = self.prev_span;
+                match self.parse_expr() {
+                    Ok(e) => {
+                        base = Some(e);
+                    }
+                    Err(mut e) => {
+                        e.emit();
+                        self.recover_stmt();
+                    }
+                }
+                if self.token == token::Comma {
+                    let mut err = self.sess.span_diagnostic.mut_span_err(
+                        exp_span.to(self.prev_span),
+                        "cannot use a comma after the base struct",
+                    );
+                    err.span_suggestion_short(
+                        self.span,
+                        "remove this comma",
+                        String::new(),
+                        Applicability::MachineApplicable
+                    );
+                    err.note("the base struct must always be the last field");
+                    err.emit();
+                    self.recover_stmt();
+                }
+                break;
+            }
+            let mut recovery_field = None;
+            if let token::Ident(ident, _) = self.token {
+                if !self.token.is_reserved_ident() && self.look_ahead(1, |t| *t == token::Colon) {
+                    // Use in case of error after field-looking code: `S { foo: () with a }`
+                    let mut ident = ident.clone();
+                    ident.span = self.span;
+                    recovery_field = Some(ast::Field {
+                        ident,
+                        span: self.span,
+                        expr: self.mk_expr(self.span, ExprKind::Err, ThinVec::new()),
+                        is_shorthand: false,
+                        attrs: ThinVec::new(),
+                    });
+                }
+            }
+            let mut parsed_field = None;
+            match self.parse_field() {
+                Ok(f) => parsed_field = Some(f),
+                Err(mut e) => {
+                    e.span_label(struct_sp, "while parsing this struct");
+                    e.emit();
+                    // If the next token is a comma, then try to parse
+                    // what comes next as additional fields, rather than
+                    // bailing out until next `}`.
+                    if self.token != token::Comma {
+                        self.recover_stmt_(SemiColonMode::Comma, BlockMode::Ignore);
+                        if self.token != token::Comma {
+                            break;
+                        }
+                    }
+                }
+            }
+            match self.expect_one_of(&[token::Comma],
+                                     &[token::CloseDelim(token::Brace)]) {
+                Ok(_) => if let Some(f) = parsed_field.or(recovery_field) {
+                    // only include the field if there's no parse error for the field name
+                    fields.push(f);
+                }
+                Err(mut e) => {
+                    if let Some(f) = recovery_field {
+                        fields.push(f);
+                    }
+                    e.span_label(struct_sp, "while parsing this struct");
+                    e.emit();
+                    self.recover_stmt_(SemiColonMode::Comma, BlockMode::Ignore);
+                    self.eat(&token::Comma);
+                }
+            }
+        }
+        let span = lo.to(self.span);
+        self.expect(&token::CloseDelim(token::Brace))?;
+        return Ok(self.mk_expr(span, ExprKind::Struct(pth, fields, base), attrs));
+    }
+    fn parse_or_use_outer_attributes(&mut self,
+                                     already_parsed_attrs: Option<ThinVec<Attribute>>)
+                                     -> PResult<'a, ThinVec<Attribute>> {
+        if let Some(attrs) = already_parsed_attrs {
+            Ok(attrs)
+        } else {
+            self.parse_outer_attributes().map(|a| a.into())
+        }
+    }
+    /// Parses a block or unsafe block.
+    fn parse_block_expr(&mut self, opt_label: Option<Label>,
+                            lo: Span, blk_mode: BlockCheckMode,
+                            outer_attrs: ThinVec<Attribute>)
+                            -> PResult<'a, P<Expr>> {
+        self.expect(&token::OpenDelim(token::Brace))?;
+        let mut attrs = outer_attrs;
+        attrs.extend(self.parse_inner_attributes()?);
+        let blk = self.parse_block_tail(lo, blk_mode)?;
+        return Ok(self.mk_expr(blk.span, ExprKind::Block(blk, opt_label), attrs));
+    }
+    /// Parses `a.b` or `a(13)` or `a[4]` or just `a`.
+    fn parse_dot_or_call_expr(&mut self,
+                                  already_parsed_attrs: Option<ThinVec<Attribute>>)
+                                  -> PResult<'a, P<Expr>> {
+        let attrs = self.parse_or_use_outer_attributes(already_parsed_attrs)?;
+        let b = self.parse_bottom_expr();
+        let (span, b) = self.interpolated_or_expr_span(b)?;
+        self.parse_dot_or_call_expr_with(b, span, attrs)
+    }
+    fn parse_dot_or_call_expr_with(&mut self,
+                                       e0: P<Expr>,
+                                       lo: Span,
+                                       mut attrs: ThinVec<Attribute>)
+                                       -> PResult<'a, P<Expr>> {
+        // Stitch the list of outer attributes onto the return value.
+        // A little bit ugly, but the best way given the current code
+        // structure
+        self.parse_dot_or_call_expr_with_(e0, lo)
+        .map(|expr|
+            expr.map(|mut expr| {
+                attrs.extend::<Vec<_>>(expr.attrs.into());
+                expr.attrs = attrs;
+                match expr.node {
+                    ExprKind::If(..) | ExprKind::IfLet(..) => {
+                        if !expr.attrs.is_empty() {
+                            // Just point to the first attribute in there...
+                            let span = expr.attrs[0].span;
+                            self.span_err(span,
+                                "attributes are not yet allowed on `if` \
+                                expressions");
+                        }
+                    }
+                    _ => {}
+                }
+                expr
+            })
+        )
+    }
+    // Assuming we have just parsed `.`, continue parsing into an expression.
+    fn parse_dot_suffix(&mut self, self_arg: P<Expr>, lo: Span) -> PResult<'a, P<Expr>> {
+        let segment = self.parse_path_segment(PathStyle::Expr, true)?;
+        self.check_trailing_angle_brackets(&segment, token::OpenDelim(token::Paren));
+        Ok(match self.token {
+            token::OpenDelim(token::Paren) => {
+                // Method call `expr.f()`
+                let mut args = self.parse_unspanned_seq(
+                    &token::OpenDelim(token::Paren),
+                    &token::CloseDelim(token::Paren),
+                    SeqSep::trailing_allowed(token::Comma),
+                    |p| Ok(p.parse_expr()?)
+                )?;
+                args.insert(0, self_arg);
+                let span = lo.to(self.prev_span);
+                self.mk_expr(span, ExprKind::MethodCall(segment, args), ThinVec::new())
+            }
+            _ => {
+                // Field access `expr.f`
+                if let Some(args) = segment.args {
+                    self.span_err(args.span(),
+                                  "field expressions may not have generic arguments");
+                }
+                let span = lo.to(self.prev_span);
+                self.mk_expr(span, ExprKind::Field(self_arg, segment.ident), ThinVec::new())
+            }
+        })
+    }
+    /// This function checks if there are trailing angle brackets and produces
+    /// a diagnostic to suggest removing them.
+    ///
+    /// ```ignore (diagnostic)
+    /// let _ = vec![1, 2, 3].into_iter().collect::<Vec<usize>>>>();
+    ///                                                        ^^ help: remove extra angle brackets
+    /// ```
+    fn check_trailing_angle_brackets(&mut self, segment: &PathSegment, end: token::Token) {
+        // This function is intended to be invoked after parsing a path segment where there are two
+        // cases:
+        //
+        // 1. A specific token is expected after the path segment.
+        //    eg. `x.foo(`, `x.foo::<u32>(` (parenthesis - method call),
+        //        `Foo::`, or `Foo::<Bar>::` (mod sep - continued path).
+        // 2. No specific token is expected after the path segment.
+        //    eg. `x.foo` (field access)
+        //
+        // This function is called after parsing `.foo` and before parsing the token `end` (if
+        // present). This includes any angle bracket arguments, such as `.foo::<u32>` or
+        // `Foo::<Bar>`.
+        // We only care about trailing angle brackets if we previously parsed angle bracket
+        // arguments. This helps stop us incorrectly suggesting that extra angle brackets be
+        // removed in this case:
+        //
+        // `x.foo >> (3)` (where `x.foo` is a `u32` for example)
+        //
+        // This case is particularly tricky as we won't notice it just looking at the tokens -
+        // it will appear the same (in terms of upcoming tokens) as below (since the `::<u32>` will
+        // have already been parsed):
+        //
+        // `x.foo::<u32>>>(3)`
+        let parsed_angle_bracket_args = segment.args
+            .as_ref()
+            .map(|args| args.is_angle_bracketed())
+            .unwrap_or(false);
+        debug!(
+            "check_trailing_angle_brackets: parsed_angle_bracket_args={:?}",
+            parsed_angle_bracket_args,
+        );
+        if !parsed_angle_bracket_args {
+            return;
+        }
+        // Keep the span at the start so we can highlight the sequence of `>` characters to be
+        // removed.
+        let lo = self.span;
+        // We need to look-ahead to see if we have `>` characters without moving the cursor forward
+        // (since we might have the field access case and the characters we're eating are
+        // actual operators and not trailing characters - ie `x.foo >> 3`).
+        let mut position = 0;
+        // We can encounter `>` or `>>` tokens in any order, so we need to keep track of how
+        // many of each (so we can correctly pluralize our error messages) and continue to
+        // advance.
+        let mut number_of_shr = 0;
+        let mut number_of_gt = 0;
+        while self.look_ahead(position, |t| {
+            trace!("check_trailing_angle_brackets: t={:?}", t);
+            if *t == token::BinOp(token::BinOpToken::Shr) {
+                number_of_shr += 1;
+                true
+            } else if *t == token::Gt {
+                number_of_gt += 1;
+                true
+            } else {
+                false
+            }
+        }) {
+            position += 1;
+        }
+        // If we didn't find any trailing `>` characters, then we have nothing to error about.
+        debug!(
+            "check_trailing_angle_brackets: number_of_gt={:?} number_of_shr={:?}",
+            number_of_gt, number_of_shr,
+        );
+        if number_of_gt < 1 && number_of_shr < 1 {
+            return;
+        }
+        // Finally, double check that we have our end token as otherwise this is the
+        // second case.
+        if self.look_ahead(position, |t| {
+            trace!("check_trailing_angle_brackets: t={:?}", t);
+            *t == end
+        }) {
+            // Eat from where we started until the end token so that parsing can continue
+            // as if we didn't have those extra angle brackets.
+            self.eat_to_tokens(&[&end]);
+            let span = lo.until(self.span);
+            let plural = number_of_gt > 1 || number_of_shr >= 1;
+            self.diagnostic()
+                .struct_span_err(
+                    span,
+                    &format!("unmatched angle bracket{}", if plural { "s" } else { "" }),
+                )
+                .span_suggestion(
+                    span,
+                    &format!("remove extra angle bracket{}", if plural { "s" } else { "" }),
+                    String::new(),
+                    Applicability::MachineApplicable,
+                )
+                .emit();
+        }
+    }
+    fn parse_dot_or_call_expr_with_(&mut self, e0: P<Expr>, lo: Span) -> PResult<'a, P<Expr>> {
+        let mut e = e0;
+        let mut hi;
+        loop {
+            // expr?
+            while self.eat(&token::Question) {
+                let hi = self.prev_span;
+                e = self.mk_expr(lo.to(hi), ExprKind::Try(e), ThinVec::new());
+            }
+            // expr.f
+            if self.eat(&token::Dot) {
+                match self.token {
+                  token::Ident(..) => {
+                    e = self.parse_dot_suffix(e, lo)?;
+                  }
+                  token::Literal(token::Integer(name), _) => {
+                    let span = self.span;
+                    self.bump();
+                    let field = ExprKind::Field(e, Ident::new(name, span));
+                    e = self.mk_expr(lo.to(span), field, ThinVec::new());
+                  }
+                  token::Literal(token::Float(n), _suf) => {
+                    self.bump();
+                    let fstr = n.as_str();
+                    let mut err = self.diagnostic()
+                        .struct_span_err(self.prev_span, &format!("unexpected token: `{}`", n));
+                    err.span_label(self.prev_span, "unexpected token");
+                    if fstr.chars().all(|x| "0123456789.".contains(x)) {
+                        let float = match fstr.parse::<f64>().ok() {
+                            Some(f) => f,
+                            None => continue,
+                        };
+                        let sugg = pprust::to_string(|s| {
+                            use crate::print::pprust::PrintState;
+                            s.popen()?;
+                            s.print_expr(&e)?;
+                            s.s.word( ".")?;
+                            s.print_usize(float.trunc() as usize)?;
+                            s.pclose()?;
+                            s.s.word(".")?;
+                            s.s.word(fstr.splitn(2, ".").last().unwrap().to_string())
+                        });
+                        err.span_suggestion(
+                            lo.to(self.prev_span),
+                            "try parenthesizing the first index",
+                            sugg,
+                            Applicability::MachineApplicable
+                        );
+                    }
+                    return Err(err);
+                  }
+                  _ => {
+                    // FIXME Could factor this out into non_fatal_unexpected or something.
+                    let actual = self.this_token_to_string();
+                    self.span_err(self.span, &format!("unexpected token: `{}`", actual));
+                  }
+                }
+                continue;
+            }
+            if self.expr_is_complete(&e) { break; }
+            match self.token {
+              // expr(...)
+              token::OpenDelim(token::Paren) => {
+                let es = self.parse_unspanned_seq(
+                    &token::OpenDelim(token::Paren),
+                    &token::CloseDelim(token::Paren),
+                    SeqSep::trailing_allowed(token::Comma),
+                    |p| Ok(p.parse_expr()?)
+                )?;
+                hi = self.prev_span;
+                let nd = self.mk_call(e, es);
+                e = self.mk_expr(lo.to(hi), nd, ThinVec::new());
+              }
+              // expr[...]
+              // Could be either an index expression or a slicing expression.
+              token::OpenDelim(token::Bracket) => {
+                self.bump();
+                let ix = self.parse_expr()?;
+                hi = self.span;
+                self.expect(&token::CloseDelim(token::Bracket))?;
+                let index = self.mk_index(e, ix);
+                e = self.mk_expr(lo.to(hi), index, ThinVec::new())
+              }
+              _ => return Ok(e)
+            }
+        }
+        return Ok(e);
+    }
+    crate fn process_potential_macro_variable(&mut self) {
+        let (token, span) = match self.token {
+            token::Dollar if self.span.ctxt() != syntax_pos::hygiene::SyntaxContext::empty() &&
+                             self.look_ahead(1, |t| t.is_ident()) => {
+                self.bump();
+                let name = match self.token {
+                    token::Ident(ident, _) => ident,
+                    _ => unreachable!()
+                };
+                let mut err = self.fatal(&format!("unknown macro variable `{}`", name));
+                err.span_label(self.span, "unknown macro variable");
+                err.emit();
+                self.bump();
+                return
+            }
+            token::Interpolated(ref nt) => {
+                self.meta_var_span = Some(self.span);
+                // Interpolated identifier and lifetime tokens are replaced with usual identifier
+                // and lifetime tokens, so the former are never encountered during normal parsing.
+                match **nt {
+                    token::NtIdent(ident, is_raw) => (token::Ident(ident, is_raw), ident.span),
+                    token::NtLifetime(ident) => (token::Lifetime(ident), ident.span),
+                    _ => return,
+                }
+            }
+            _ => return,
+        };
+        self.token = token;
+        self.span = span;
+    }
+    /// Parses a single token tree from the input.
+    crate fn parse_token_tree(&mut self) -> TokenTree {
+        match self.token {
+            token::OpenDelim(..) => {
+                let frame = mem::replace(&mut self.token_cursor.frame,
+                                         self.token_cursor.stack.pop().unwrap());
+                self.span = frame.span.entire();
+                self.bump();
+                TokenTree::Delimited(
+                    frame.span,
+                    frame.delim,
+                    frame.tree_cursor.stream.into(),
+                )
+            },
+            token::CloseDelim(_) | token::Eof => unreachable!(),
+            _ => {
+                let (token, span) = (mem::replace(&mut self.token, token::Whitespace), self.span);
+                self.bump();
+                TokenTree::Token(span, token)
+            }
+        }
+    }
+    // parse a stream of tokens into a list of TokenTree's,
+    // up to EOF.
+    pub fn parse_all_token_trees(&mut self) -> PResult<'a, Vec<TokenTree>> {
+        let mut tts = Vec::new();
+        while self.token != token::Eof {
+            tts.push(self.parse_token_tree());
+        }
+        Ok(tts)
+    }
+    pub fn parse_tokens(&mut self) -> TokenStream {
+        let mut result = Vec::new();
+        loop {
+            match self.token {
+                token::Eof | token::CloseDelim(..) => break,
+                _ => result.push(self.parse_token_tree().into()),
+            }
+        }
+        TokenStream::new(result)
+    }
+    /// Parse a prefix-unary-operator expr
+    fn parse_prefix_expr(&mut self,
+                             already_parsed_attrs: Option<ThinVec<Attribute>>)
+                             -> PResult<'a, P<Expr>> {
+        let attrs = self.parse_or_use_outer_attributes(already_parsed_attrs)?;
+        let lo = self.span;
+        // Note: when adding new unary operators, don't forget to adjust Token::can_begin_expr()
+        let (hi, ex) = match self.token {
+            token::Not => {
+                self.bump();
+                let e = self.parse_prefix_expr(None);
+                let (span, e) = self.interpolated_or_expr_span(e)?;
+                (lo.to(span), self.mk_unary(UnOp::Not, e))
+            }
+            // Suggest `!` for bitwise negation when encountering a `~`
+            token::Tilde => {
+                self.bump();
+                let e = self.parse_prefix_expr(None);
+                let (span, e) = self.interpolated_or_expr_span(e)?;
+                let span_of_tilde = lo;
+                let mut err = self.diagnostic()
+                    .struct_span_err(span_of_tilde, "`~` cannot be used as a unary operator");
+                err.span_suggestion_short(
+                    span_of_tilde,
+                    "use `!` to perform bitwise negation",
+                    "!".to_owned(),
+                    Applicability::MachineApplicable
+                );
+                err.emit();
+                (lo.to(span), self.mk_unary(UnOp::Not, e))
+            }
+            token::BinOp(token::Minus) => {
+                self.bump();
+                let e = self.parse_prefix_expr(None);
+                let (span, e) = self.interpolated_or_expr_span(e)?;
+                (lo.to(span), self.mk_unary(UnOp::Neg, e))
+            }
+            token::BinOp(token::Star) => {
+                self.bump();
+                let e = self.parse_prefix_expr(None);
+                let (span, e) = self.interpolated_or_expr_span(e)?;
+                (lo.to(span), self.mk_unary(UnOp::Deref, e))
+            }
+            token::BinOp(token::And) | token::AndAnd => {
+                self.expect_and()?;
+                let m = self.parse_mutability();
+                let e = self.parse_prefix_expr(None);
+                let (span, e) = self.interpolated_or_expr_span(e)?;
+                (lo.to(span), ExprKind::AddrOf(m, e))
+            }
+            token::Ident(..) if self.token.is_keyword(keywords::In) => {
+                self.bump();
+                let place = self.parse_expr_res(
+                    Restrictions::NO_STRUCT_LITERAL,
+                    None,
+                )?;
+                let blk = self.parse_block()?;
+                let span = blk.span;
+                let blk_expr = self.mk_expr(span, ExprKind::Block(blk, None), ThinVec::new());
+                (lo.to(span), ExprKind::ObsoleteInPlace(place, blk_expr))
+            }
+            token::Ident(..) if self.token.is_keyword(keywords::Box) => {
+                self.bump();
+                let e = self.parse_prefix_expr(None);
+                let (span, e) = self.interpolated_or_expr_span(e)?;
+                (lo.to(span), ExprKind::Box(e))
+            }
+            token::Ident(..) if self.token.is_ident_named("not") => {
+                // `not` is just an ordinary identifier in Rust-the-language,
+                // but as `rustc`-the-compiler, we can issue clever diagnostics
+                // for confused users who really want to say `!`
+                let token_cannot_continue_expr = |t: &token::Token| match *t {
+                    // These tokens can start an expression after `!`, but
+                    // can't continue an expression after an ident
+                    token::Ident(ident, is_raw) => token::ident_can_begin_expr(ident, is_raw),
+                    token::Literal(..) | token::Pound => true,
+                    token::Interpolated(ref nt) => match **nt {
+                        token::NtIdent(..) | token::NtExpr(..) |
+                        token::NtBlock(..) | token::NtPath(..) => true,
+                        _ => false,
+                    },
+                    _ => false
+                };
+                let cannot_continue_expr = self.look_ahead(1, token_cannot_continue_expr);
+                if cannot_continue_expr {
+                    self.bump();
+                    // Emit the error ...
+                    let mut err = self.diagnostic()
+                        .struct_span_err(self.span,
+                                         &format!("unexpected {} after identifier",
+                                                  self.this_token_descr()));
+                    // span the `not` plus trailing whitespace to avoid
+                    // trailing whitespace after the `!` in our suggestion
+                    let to_replace = self.sess.source_map()
+                        .span_until_non_whitespace(lo.to(self.span));
+                    err.span_suggestion_short(
+                        to_replace,
+                        "use `!` to perform logical negation",
+                        "!".to_owned(),
+                        Applicability::MachineApplicable
+                    );
+                    err.emit();
+                    // —and recover! (just as if we were in the block
+                    // for the `token::Not` arm)
+                    let e = self.parse_prefix_expr(None);
+                    let (span, e) = self.interpolated_or_expr_span(e)?;
+                    (lo.to(span), self.mk_unary(UnOp::Not, e))
+                } else {
+                    return self.parse_dot_or_call_expr(Some(attrs));
+                }
+            }
+            _ => { return self.parse_dot_or_call_expr(Some(attrs)); }
+        };
+        return Ok(self.mk_expr(lo.to(hi), ex, attrs));
+    }
+    /// Parses an associative expression.
+    ///
+    /// This parses an expression accounting for associativity and precedence of the operators in
+    /// the expression.
+    #[inline]
+    fn parse_assoc_expr(&mut self,
+                            already_parsed_attrs: Option<ThinVec<Attribute>>)
+                            -> PResult<'a, P<Expr>> {
+        self.parse_assoc_expr_with(0, already_parsed_attrs.into())
+    }
+    /// Parses an associative expression with operators of at least `min_prec` precedence.
+    fn parse_assoc_expr_with(&mut self,
+                                 min_prec: usize,
+                                 lhs: LhsExpr)
+                                 -> PResult<'a, P<Expr>> {
+        let mut lhs = if let LhsExpr::AlreadyParsed(expr) = lhs {
+            expr
+        } else {
+            let attrs = match lhs {
+                LhsExpr::AttributesParsed(attrs) => Some(attrs),
+                _ => None,
+            };
+            if [token::DotDot, token::DotDotDot, token::DotDotEq].contains(&self.token) {
+                return self.parse_prefix_range_expr(attrs);
+            } else {
+                self.parse_prefix_expr(attrs)?
+            }
+        };
+        if self.expr_is_complete(&lhs) {
+            // Semi-statement forms are odd. See https://github.com/rust-lang/rust/issues/29071
+            return Ok(lhs);
+        }
+        self.expected_tokens.push(TokenType::Operator);
+        while let Some(op) = AssocOp::from_token(&self.token) {
+            // Adjust the span for interpolated LHS to point to the `$lhs` token and not to what
+            // it refers to. Interpolated identifiers are unwrapped early and never show up here
+            // as `PrevTokenKind::Interpolated` so if LHS is a single identifier we always process
+            // it as "interpolated", it doesn't change the answer for non-interpolated idents.
+            let lhs_span = match (self.prev_token_kind, &lhs.node) {
+                (PrevTokenKind::Interpolated, _) => self.prev_span,
+                (PrevTokenKind::Ident, &ExprKind::Path(None, ref path))
+                    if path.segments.len() == 1 => self.prev_span,
+                _ => lhs.span,
+            };
+            let cur_op_span = self.span;
+            let restrictions = if op.is_assign_like() {
+                self.restrictions & Restrictions::NO_STRUCT_LITERAL
+            } else {
+                self.restrictions
+            };
+            if op.precedence() < min_prec {
+                break;
+            }
+            // Check for deprecated `...` syntax
+            if self.token == token::DotDotDot && op == AssocOp::DotDotEq {
+                self.err_dotdotdot_syntax(self.span);
+            }
+            self.bump();
+            if op.is_comparison() {
+                self.check_no_chained_comparison(&lhs, &op);
+            }
+            // Special cases:
+            if op == AssocOp::As {
+                lhs = self.parse_assoc_op_cast(lhs, lhs_span, ExprKind::Cast)?;
+                continue
+            } else if op == AssocOp::Colon {
+                lhs = match self.parse_assoc_op_cast(lhs, lhs_span, ExprKind::Type) {
+                    Ok(lhs) => lhs,
+                    Err(mut err) => {
+                        err.span_label(self.span,
+                                       "expecting a type here because of type ascription");
+                        let cm = self.sess.source_map();
+                        let cur_pos = cm.lookup_char_pos(self.span.lo());
+                        let op_pos = cm.lookup_char_pos(cur_op_span.hi());
+                        if cur_pos.line != op_pos.line {
+                            err.span_suggestion(
+                                cur_op_span,
+                                "try using a semicolon",
+                                ";".to_string(),
+                                Applicability::MaybeIncorrect // speculative
+                            );
+                        }
+                        return Err(err);
+                    }
+                };
+                continue
+            } else if op == AssocOp::DotDot || op == AssocOp::DotDotEq {
+                // If we didn’t have to handle `x..`/`x..=`, it would be pretty easy to
+                // generalise it to the Fixity::None code.
+                //
+                // We have 2 alternatives here: `x..y`/`x..=y` and `x..`/`x..=` The other
+                // two variants are handled with `parse_prefix_range_expr` call above.
+                let rhs = if self.is_at_start_of_range_notation_rhs() {
+                    Some(self.parse_assoc_expr_with(op.precedence() + 1,
+                                                    LhsExpr::NotYetParsed)?)
+                } else {
+                    None
+                };
+                let (lhs_span, rhs_span) = (lhs.span, if let Some(ref x) = rhs {
+                    x.span
+                } else {
+                    cur_op_span
+                });
+                let limits = if op == AssocOp::DotDot {
+                    RangeLimits::HalfOpen
+                } else {
+                    RangeLimits::Closed
+                };
+                let r = self.mk_range(Some(lhs), rhs, limits)?;
+                lhs = self.mk_expr(lhs_span.to(rhs_span), r, ThinVec::new());
+                break
+            }
+            let rhs = match op.fixity() {
+                Fixity::Right => self.with_res(
+                    restrictions - Restrictions::STMT_EXPR,
+                    |this| {
+                        this.parse_assoc_expr_with(op.precedence(),
+                            LhsExpr::NotYetParsed)
+                }),
+                Fixity::Left => self.with_res(
+                    restrictions - Restrictions::STMT_EXPR,
+                    |this| {
+                        this.parse_assoc_expr_with(op.precedence() + 1,
+                            LhsExpr::NotYetParsed)
+                }),
+                // We currently have no non-associative operators that are not handled above by
+                // the special cases. The code is here only for future convenience.
+                Fixity::None => self.with_res(
+                    restrictions - Restrictions::STMT_EXPR,
+                    |this| {
+                        this.parse_assoc_expr_with(op.precedence() + 1,
+                            LhsExpr::NotYetParsed)
+                }),
+            }?;
+            // Make sure that the span of the parent node is larger than the span of lhs and rhs,
+            // including the attributes.
+            let lhs_span = lhs
+                .attrs
+                .iter()
+                .filter(|a| a.style == AttrStyle::Outer)
+                .next()
+                .map_or(lhs_span, |a| a.span);
+            let span = lhs_span.to(rhs.span);
+            lhs = match op {
+                AssocOp::Add | AssocOp::Subtract | AssocOp::Multiply | AssocOp::Divide |
+                AssocOp::Modulus | AssocOp::LAnd | AssocOp::LOr | AssocOp::BitXor |
+                AssocOp::BitAnd | AssocOp::BitOr | AssocOp::ShiftLeft | AssocOp::ShiftRight |
+                AssocOp::Equal | AssocOp::Less | AssocOp::LessEqual | AssocOp::NotEqual |
+                AssocOp::Greater | AssocOp::GreaterEqual => {
+                    let ast_op = op.to_ast_binop().unwrap();
+                    let binary = self.mk_binary(source_map::respan(cur_op_span, ast_op), lhs, rhs);
+                    self.mk_expr(span, binary, ThinVec::new())
+                }
+                AssocOp::Assign =>
+                    self.mk_expr(span, ExprKind::Assign(lhs, rhs), ThinVec::new()),
+                AssocOp::ObsoleteInPlace =>
+                    self.mk_expr(span, ExprKind::ObsoleteInPlace(lhs, rhs), ThinVec::new()),
+                AssocOp::AssignOp(k) => {
+                    let aop = match k {
+                        token::Plus =>    BinOpKind::Add,
+                        token::Minus =>   BinOpKind::Sub,
+                        token::Star =>    BinOpKind::Mul,
+                        token::Slash =>   BinOpKind::Div,
+                        token::Percent => BinOpKind::Rem,
+                        token::Caret =>   BinOpKind::BitXor,
+                        token::And =>     BinOpKind::BitAnd,
+                        token::Or =>      BinOpKind::BitOr,
+                        token::Shl =>     BinOpKind::Shl,
+                        token::Shr =>     BinOpKind::Shr,
+                    };
+                    let aopexpr = self.mk_assign_op(source_map::respan(cur_op_span, aop), lhs, rhs);
+                    self.mk_expr(span, aopexpr, ThinVec::new())
+                }
+                AssocOp::As | AssocOp::Colon | AssocOp::DotDot | AssocOp::DotDotEq => {
+                    self.bug("AssocOp should have been handled by special case")
+                }
+            };
+            if op.fixity() == Fixity::None { break }
+        }
+        Ok(lhs)
+    }
+    fn parse_assoc_op_cast(&mut self, lhs: P<Expr>, lhs_span: Span,
+                           expr_kind: fn(P<Expr>, P<Ty>) -> ExprKind)
+                           -> PResult<'a, P<Expr>> {
+        let mk_expr = |this: &mut Self, rhs: P<Ty>| {
+            this.mk_expr(lhs_span.to(rhs.span), expr_kind(lhs, rhs), ThinVec::new())
+        };
+        // Save the state of the parser before parsing type normally, in case there is a
+        // LessThan comparison after this cast.
+        let parser_snapshot_before_type = self.clone();
+        match self.parse_ty_no_plus() {
+            Ok(rhs) => {
+                Ok(mk_expr(self, rhs))
+            }
+            Err(mut type_err) => {
+                // Rewind to before attempting to parse the type with generics, to recover
+                // from situations like `x as usize < y` in which we first tried to parse
+                // `usize < y` as a type with generic arguments.
+                let parser_snapshot_after_type = self.clone();
+                mem::replace(self, parser_snapshot_before_type);
+                match self.parse_path(PathStyle::Expr) {
+                    Ok(path) => {
+                        let (op_noun, op_verb) = match self.token {
+                            token::Lt => ("comparison", "comparing"),
+                            token::BinOp(token::Shl) => ("shift", "shifting"),
+                            _ => {
+                                // We can end up here even without `<` being the next token, for
+                                // example because `parse_ty_no_plus` returns `Err` on keywords,
+                                // but `parse_path` returns `Ok` on them due to error recovery.
+                                // Return original error and parser state.
+                                mem::replace(self, parser_snapshot_after_type);
+                                return Err(type_err);
+                            }
+                        };
+                        // Successfully parsed the type path leaving a `<` yet to parse.
+                        type_err.cancel();
+                        // Report non-fatal diagnostics, keep `x as usize` as an expression
+                        // in AST and continue parsing.
+                        let msg = format!("`<` is interpreted as a start of generic \
+                                           arguments for `{}`, not a {}", path, op_noun);
+                        let mut err = self.sess.span_diagnostic.struct_span_err(self.span, &msg);
+                        err.span_label(self.look_ahead_span(1).to(parser_snapshot_after_type.span),
+                                       "interpreted as generic arguments");
+                        err.span_label(self.span, format!("not interpreted as {}", op_noun));
+                        let expr = mk_expr(self, P(Ty {
+                            span: path.span,
+                            node: TyKind::Path(None, path),
+                            id: ast::DUMMY_NODE_ID
+                        }));
+                        let expr_str = self.sess.source_map().span_to_snippet(expr.span)
+                                                .unwrap_or_else(|_| pprust::expr_to_string(&expr));
+                        err.span_suggestion(
+                            expr.span,
+                            &format!("try {} the cast value", op_verb),
+                            format!("({})", expr_str),
+                            Applicability::MachineApplicable
+                        );
+                        err.emit();
+                        Ok(expr)
+                    }
+                    Err(mut path_err) => {
+                        // Couldn't parse as a path, return original error and parser state.
+                        path_err.cancel();
+                        mem::replace(self, parser_snapshot_after_type);
+                        Err(type_err)
+                    }
+                }
+            }
+        }
+    }
+    /// Produce an error if comparison operators are chained (RFC #558).
+    /// We only need to check lhs, not rhs, because all comparison ops
+    /// have same precedence and are left-associative
+    fn check_no_chained_comparison(&mut self, lhs: &Expr, outer_op: &AssocOp) {
+        debug_assert!(outer_op.is_comparison(),
+                      "check_no_chained_comparison: {:?} is not comparison",
+                      outer_op);
+        match lhs.node {
+            ExprKind::Binary(op, _, _) if op.node.is_comparison() => {
+                // respan to include both operators
+                let op_span = op.span.to(self.span);
+                let mut err = self.diagnostic().struct_span_err(op_span,
+                    "chained comparison operators require parentheses");
+                if op.node == BinOpKind::Lt &&
+                    *outer_op == AssocOp::Less ||  // Include `<` to provide this recommendation
+                    *outer_op == AssocOp::Greater  // even in a case like the following:
+                {                                  //     Foo<Bar<Baz<Qux, ()>>>
+                    err.help(
+                        "use `::<...>` instead of `<...>` if you meant to specify type arguments");
+                    err.help("or use `(...)` if you meant to specify fn arguments");
+                }
+                err.emit();
+            }
+            _ => {}
+        }
+    }
+    /// Parse prefix-forms of range notation: `..expr`, `..`, `..=expr`
+    fn parse_prefix_range_expr(&mut self,
+                               already_parsed_attrs: Option<ThinVec<Attribute>>)
+                               -> PResult<'a, P<Expr>> {
+        // Check for deprecated `...` syntax
+        if self.token == token::DotDotDot {
+            self.err_dotdotdot_syntax(self.span);
+        }
+        debug_assert!([token::DotDot, token::DotDotDot, token::DotDotEq].contains(&self.token),
+                      "parse_prefix_range_expr: token {:?} is not DotDot/DotDotEq",
+                      self.token);
+        let tok = self.token.clone();
+        let attrs = self.parse_or_use_outer_attributes(already_parsed_attrs)?;
+        let lo = self.span;
+        let mut hi = self.span;
+        self.bump();
+        let opt_end = if self.is_at_start_of_range_notation_rhs() {
+            // RHS must be parsed with more associativity than the dots.
+            let next_prec = AssocOp::from_token(&tok).unwrap().precedence() + 1;
+            Some(self.parse_assoc_expr_with(next_prec,
+                                            LhsExpr::NotYetParsed)
+                .map(|x|{
+                    hi = x.span;
+                    x
+                })?)
+         } else {
+            None
+        };
+        let limits = if tok == token::DotDot {
+            RangeLimits::HalfOpen
+        } else {
+            RangeLimits::Closed
+        };
+        let r = self.mk_range(None, opt_end, limits)?;
+        Ok(self.mk_expr(lo.to(hi), r, attrs))
+    }
+    fn is_at_start_of_range_notation_rhs(&self) -> bool {
+        if self.token.can_begin_expr() {
+            // parse `for i in 1.. { }` as infinite loop, not as `for i in (1..{})`.
+            if self.token == token::OpenDelim(token::Brace) {
+                return !self.restrictions.contains(Restrictions::NO_STRUCT_LITERAL);
+            }
+            true
+        } else {
+            false
+        }
+    }
+    /// Parses an `if` or `if let` expression (`if` token already eaten).
+    fn parse_if_expr(&mut self, attrs: ThinVec<Attribute>) -> PResult<'a, P<Expr>> {
+        if self.check_keyword(keywords::Let) {
+            return self.parse_if_let_expr(attrs);
+        }
+        let lo = self.prev_span;
+        let cond = self.parse_expr_res(Restrictions::NO_STRUCT_LITERAL, None)?;
+        // Verify that the parsed `if` condition makes sense as a condition. If it is a block, then
+        // verify that the last statement is either an implicit return (no `;`) or an explicit
+        // return. This won't catch blocks with an explicit `return`, but that would be caught by
+        // the dead code lint.
+        if self.eat_keyword(keywords::Else) || !cond.returns() {
+            let sp = self.sess.source_map().next_point(lo);
+            let mut err = self.diagnostic()
+                .struct_span_err(sp, "missing condition for `if` statemement");
+            err.span_label(sp, "expected if condition here");
+            return Err(err)
+        }
+        let not_block = self.token != token::OpenDelim(token::Brace);
+        let thn = self.parse_block().map_err(|mut err| {
+            if not_block {
+                err.span_label(lo, "this `if` statement has a condition, but no block");
+            }
+            err
+        })?;
+        let mut els: Option<P<Expr>> = None;
+        let mut hi = thn.span;
+        if self.eat_keyword(keywords::Else) {
+            let elexpr = self.parse_else_expr()?;
+            hi = elexpr.span;
+            els = Some(elexpr);
+        }
+        Ok(self.mk_expr(lo.to(hi), ExprKind::If(cond, thn, els), attrs))
+    }
+    /// Parses an `if let` expression (`if` token already eaten).
+    fn parse_if_let_expr(&mut self, attrs: ThinVec<Attribute>)
+                             -> PResult<'a, P<Expr>> {
+        let lo = self.prev_span;
+        self.expect_keyword(keywords::Let)?;
+        let pats = self.parse_pats()?;
+        self.expect(&token::Eq)?;
+        let expr = self.parse_expr_res(Restrictions::NO_STRUCT_LITERAL, None)?;
+        let thn = self.parse_block()?;
+        let (hi, els) = if self.eat_keyword(keywords::Else) {
+            let expr = self.parse_else_expr()?;
+            (expr.span, Some(expr))
+        } else {
+            (thn.span, None)
+        };
+        Ok(self.mk_expr(lo.to(hi), ExprKind::IfLet(pats, expr, thn, els), attrs))
+    }
+    /// Parses `move |args| expr`.
+    fn parse_lambda_expr(&mut self,
+                             attrs: ThinVec<Attribute>)
+                             -> PResult<'a, P<Expr>>
+    {
+        let lo = self.span;
+        let movability = if self.eat_keyword(keywords::Static) {
+            Movability::Static
+        } else {
+            Movability::Movable
+        };
+        let asyncness = if self.span.rust_2018() {
+            self.parse_asyncness()
+        } else {
+            IsAsync::NotAsync
+        };
+        let capture_clause = if self.eat_keyword(keywords::Move) {
+            CaptureBy::Value
+        } else {
+            CaptureBy::Ref
+        };
+        let decl = self.parse_fn_block_decl()?;
+        let decl_hi = self.prev_span;
+        let body = match decl.output {
+            FunctionRetTy::Default(_) => {
+                let restrictions = self.restrictions - Restrictions::STMT_EXPR;
+                self.parse_expr_res(restrictions, None)?
+            },
+            _ => {
+                // If an explicit return type is given, require a
+                // block to appear (RFC 968).
+                let body_lo = self.span;
+                self.parse_block_expr(None, body_lo, BlockCheckMode::Default, ThinVec::new())?
+            }
+        };
+        Ok(self.mk_expr(
+            lo.to(body.span),
+            ExprKind::Closure(capture_clause, asyncness, movability, decl, body, lo.to(decl_hi)),
+            attrs))
+    }
+    // `else` token already eaten
+    fn parse_else_expr(&mut self) -> PResult<'a, P<Expr>> {
+        if self.eat_keyword(keywords::If) {
+            return self.parse_if_expr(ThinVec::new());
+        } else {
+            let blk = self.parse_block()?;
+            return Ok(self.mk_expr(blk.span, ExprKind::Block(blk, None), ThinVec::new()));
+        }
+    }
+    /// Parse a 'for' .. 'in' expression ('for' token already eaten)
+    fn parse_for_expr(&mut self, opt_label: Option<Label>,
+                          span_lo: Span,
+                          mut attrs: ThinVec<Attribute>) -> PResult<'a, P<Expr>> {
+        // Parse: `for <src_pat> in <src_expr> <src_loop_block>`
+        let pat = self.parse_top_level_pat()?;
+        if !self.eat_keyword(keywords::In) {
+            let in_span = self.prev_span.between(self.span);
+            let mut err = self.sess.span_diagnostic
+                .struct_span_err(in_span, "missing `in` in `for` loop");
+            err.span_suggestion_short(
+                in_span, "try adding `in` here", " in ".into(),
+                // has been misleading, at least in the past (closed Issue #48492)
+                Applicability::MaybeIncorrect
+            );
+            err.emit();
+        }
+        let in_span = self.prev_span;
+        if self.eat_keyword(keywords::In) {
+            // a common typo: `for _ in in bar {}`
+            let mut err = self.sess.span_diagnostic.struct_span_err(
+                self.prev_span,
+                "expected iterable, found keyword `in`",
+            );
+            err.span_suggestion_short(
+                in_span.until(self.prev_span),
+                "remove the duplicated `in`",
+                String::new(),
+                Applicability::MachineApplicable,
+            );
+            err.note("if you meant to use emplacement syntax, it is obsolete (for now, anyway)");
+            err.note("for more information on the status of emplacement syntax, see <\
+                      https://github.com/rust-lang/rust/issues/27779#issuecomment-378416911>");
+            err.emit();
+        }
+        let expr = self.parse_expr_res(Restrictions::NO_STRUCT_LITERAL, None)?;
+        let (iattrs, loop_block) = self.parse_inner_attrs_and_block()?;
+        attrs.extend(iattrs);
+        let hi = self.prev_span;
+        Ok(self.mk_expr(span_lo.to(hi), ExprKind::ForLoop(pat, expr, loop_block, opt_label), attrs))
+    }
+    /// Parses a `while` or `while let` expression (`while` token already eaten).
+    fn parse_while_expr(&mut self, opt_label: Option<Label>,
+                            span_lo: Span,
+                            mut attrs: ThinVec<Attribute>) -> PResult<'a, P<Expr>> {
+        if self.token.is_keyword(keywords::Let) {
+            return self.parse_while_let_expr(opt_label, span_lo, attrs);
+        }
+        let cond = self.parse_expr_res(Restrictions::NO_STRUCT_LITERAL, None)?;
+        let (iattrs, body) = self.parse_inner_attrs_and_block()?;
+        attrs.extend(iattrs);
+        let span = span_lo.to(body.span);
+        return Ok(self.mk_expr(span, ExprKind::While(cond, body, opt_label), attrs));
+    }
+    /// Parses a `while let` expression (`while` token already eaten).
+    fn parse_while_let_expr(&mut self, opt_label: Option<Label>,
+                                span_lo: Span,
+                                mut attrs: ThinVec<Attribute>) -> PResult<'a, P<Expr>> {
+        self.expect_keyword(keywords::Let)?;
+        let pats = self.parse_pats()?;
+        self.expect(&token::Eq)?;
+        let expr = self.parse_expr_res(Restrictions::NO_STRUCT_LITERAL, None)?;
+        let (iattrs, body) = self.parse_inner_attrs_and_block()?;
+        attrs.extend(iattrs);
+        let span = span_lo.to(body.span);
+        return Ok(self.mk_expr(span, ExprKind::WhileLet(pats, expr, body, opt_label), attrs));
+    }
+    // parse `loop {...}`, `loop` token already eaten
+    fn parse_loop_expr(&mut self, opt_label: Option<Label>,
+                           span_lo: Span,
+                           mut attrs: ThinVec<Attribute>) -> PResult<'a, P<Expr>> {
+        let (iattrs, body) = self.parse_inner_attrs_and_block()?;
+        attrs.extend(iattrs);
+        let span = span_lo.to(body.span);
+        Ok(self.mk_expr(span, ExprKind::Loop(body, opt_label), attrs))
+    }
+    /// Parses an `async move {...}` expression.
+    pub fn parse_async_block(&mut self, mut attrs: ThinVec<Attribute>)
+        -> PResult<'a, P<Expr>>
+    {
+        let span_lo = self.span;
+        self.expect_keyword(keywords::Async)?;
+        let capture_clause = if self.eat_keyword(keywords::Move) {
+            CaptureBy::Value
+        } else {
+            CaptureBy::Ref
+        };
+        let (iattrs, body) = self.parse_inner_attrs_and_block()?;
+        attrs.extend(iattrs);
+        Ok(self.mk_expr(
+            span_lo.to(body.span),
+            ExprKind::Async(capture_clause, ast::DUMMY_NODE_ID, body), attrs))
+    }
+    /// Parses a `try {...}` expression (`try` token already eaten).
+    fn parse_try_block(&mut self, span_lo: Span, mut attrs: ThinVec<Attribute>)
+        -> PResult<'a, P<Expr>>
+    {
+        let (iattrs, body) = self.parse_inner_attrs_and_block()?;
+        attrs.extend(iattrs);
+        Ok(self.mk_expr(span_lo.to(body.span), ExprKind::TryBlock(body), attrs))
+    }
+    // `match` token already eaten
+    fn parse_match_expr(&mut self, mut attrs: ThinVec<Attribute>) -> PResult<'a, P<Expr>> {
+        let match_span = self.prev_span;
+        let lo = self.prev_span;
+        let discriminant = self.parse_expr_res(Restrictions::NO_STRUCT_LITERAL,
+                                               None)?;
+        if let Err(mut e) = self.expect(&token::OpenDelim(token::Brace)) {
+            if self.token == token::Token::Semi {
+                e.span_suggestion_short(
+                    match_span,
+                    "try removing this `match`",
+                    String::new(),
+                    Applicability::MaybeIncorrect // speculative
+                );
+            }
+            return Err(e)
+        }
+        attrs.extend(self.parse_inner_attributes()?);
+        let mut arms: Vec<Arm> = Vec::new();
+        while self.token != token::CloseDelim(token::Brace) {
+            match self.parse_arm() {
+                Ok(arm) => arms.push(arm),
+                Err(mut e) => {
+                    // Recover by skipping to the end of the block.
+                    e.emit();
+                    self.recover_stmt();
+                    let span = lo.to(self.span);
+                    if self.token == token::CloseDelim(token::Brace) {
+                        self.bump();
+                    }
+                    return Ok(self.mk_expr(span, ExprKind::Match(discriminant, arms), attrs));
+                }
+            }
+        }
+        let hi = self.span;
+        self.bump();
+        return Ok(self.mk_expr(lo.to(hi), ExprKind::Match(discriminant, arms), attrs));
+    }
+    crate fn parse_arm(&mut self) -> PResult<'a, Arm> {
+        maybe_whole!(self, NtArm, |x| x);
+        let attrs = self.parse_outer_attributes()?;
+        let pats = self.parse_pats()?;
+        let guard = if self.eat_keyword(keywords::If) {
+            Some(Guard::If(self.parse_expr()?))
+        } else {
+            None
+        };
+        let arrow_span = self.span;
+        self.expect(&token::FatArrow)?;
+        let arm_start_span = self.span;
+        let expr = self.parse_expr_res(Restrictions::STMT_EXPR, None)
+            .map_err(|mut err| {
+                err.span_label(arrow_span, "while parsing the `match` arm starting here");
+                err
+            })?;
+        let require_comma = classify::expr_requires_semi_to_be_stmt(&expr)
+            && self.token != token::CloseDelim(token::Brace);
+        if require_comma {
+            let cm = self.sess.source_map();
+            self.expect_one_of(&[token::Comma], &[token::CloseDelim(token::Brace)])
+                .map_err(|mut err| {
+                    match (cm.span_to_lines(expr.span), cm.span_to_lines(arm_start_span)) {
+                        (Ok(ref expr_lines), Ok(ref arm_start_lines))
+                        if arm_start_lines.lines[0].end_col == expr_lines.lines[0].end_col
+                            && expr_lines.lines.len() == 2
+                            && self.token == token::FatArrow => {
+                            // We check whether there's any trailing code in the parse span,
+                            // if there isn't, we very likely have the following:
+                            //
+                            // X |     &Y => "y"
+                            //   |        --    - missing comma
+                            //   |        |
+                            //   |        arrow_span
+                            // X |     &X => "x"
+                            //   |      - ^^ self.span
+                            //   |      |
+                            //   |      parsed until here as `"y" & X`
+                            err.span_suggestion_short(
+                                cm.next_point(arm_start_span),
+                                "missing a comma here to end this `match` arm",
+                                ",".to_owned(),
+                                Applicability::MachineApplicable
+                            );
+                        }
+                        _ => {
+                            err.span_label(arrow_span,
+                                           "while parsing the `match` arm starting here");
+                        }
+                    }
+                    err
+                })?;
+        } else {
+            self.eat(&token::Comma);
+        }
+        Ok(ast::Arm {
+            attrs,
+            pats,
+            guard,
+            body: expr,
+        })
+    }
+    /// Parses an expression.
+    #[inline]
+    pub fn parse_expr(&mut self) -> PResult<'a, P<Expr>> {
+        self.parse_expr_res(Restrictions::empty(), None)
+    }
+    /// Evaluates the closure with restrictions in place.
+    ///
+    /// Afters the closure is evaluated, restrictions are reset.
+    fn with_res<F, T>(&mut self, r: Restrictions, f: F) -> T
+        where F: FnOnce(&mut Self) -> T
+    {
+        let old = self.restrictions;
+        self.restrictions = r;
+        let r = f(self);
+        self.restrictions = old;
+        return r;
+    }
+    /// Parses an expression, subject to the given restrictions.
+    #[inline]
+    fn parse_expr_res(&mut self, r: Restrictions,
+                          already_parsed_attrs: Option<ThinVec<Attribute>>)
+                          -> PResult<'a, P<Expr>> {
+        self.with_res(r, |this| this.parse_assoc_expr(already_parsed_attrs))
+    }
+    /// Parses the RHS of a local variable declaration (e.g., '= 14;').
+    fn parse_initializer(&mut self, skip_eq: bool) -> PResult<'a, Option<P<Expr>>> {
+        if self.eat(&token::Eq) {
+            Ok(Some(self.parse_expr()?))
+        } else if skip_eq {
+            Ok(Some(self.parse_expr()?))
+        } else {
+            Ok(None)
+        }
+    }
+    /// Parses patterns, separated by '|' s.
+    fn parse_pats(&mut self) -> PResult<'a, Vec<P<Pat>>> {
+        // Allow a '|' before the pats (RFC 1925 + RFC 2530)
+        self.eat(&token::BinOp(token::Or));
+        let mut pats = Vec::new();
+        loop {
+            pats.push(self.parse_top_level_pat()?);
+            if self.token == token::OrOr {
+                let mut err = self.struct_span_err(self.span,
+                                                   "unexpected token `||` after pattern");
+                err.span_suggestion(
+                    self.span,
+                    "use a single `|` to specify multiple patterns",
+                    "|".to_owned(),
+                    Applicability::MachineApplicable
+                );
+                err.emit();
+                self.bump();
+            } else if self.eat(&token::BinOp(token::Or)) {
+                // This is a No-op. Continue the loop to parse the next
+                // pattern.
+            } else {
+                return Ok(pats);
+            }
+        };
+    }
+    // Parses a parenthesized list of patterns like
+    // `()`, `(p)`, `(p,)`, `(p, q)`, or `(p, .., q)`. Returns:
+    // - a vector of the patterns that were parsed
+    // - an option indicating the index of the `..` element
+    // - a boolean indicating whether a trailing comma was present.
+    // Trailing commas are significant because (p) and (p,) are different patterns.
+    fn parse_parenthesized_pat_list(&mut self) -> PResult<'a, (Vec<P<Pat>>, Option<usize>, bool)> {
+        self.expect(&token::OpenDelim(token::Paren))?;
+        let result = self.parse_pat_list()?;
+        self.expect(&token::CloseDelim(token::Paren))?;
+        Ok(result)
+    }
+    fn parse_pat_list(&mut self) -> PResult<'a, (Vec<P<Pat>>, Option<usize>, bool)> {
+        let mut fields = Vec::new();
+        let mut ddpos = None;
+        let mut trailing_comma = false;
+        loop {
+            if self.eat(&token::DotDot) {
+                if ddpos.is_none() {
+                    ddpos = Some(fields.len());
+                } else {
+                    // Emit a friendly error, ignore `..` and continue parsing
+                    self.struct_span_err(
+                        self.prev_span,
+                        "`..` can only be used once per tuple or tuple struct pattern",
+                    )
+                        .span_label(self.prev_span, "can only be used once per pattern")
+                        .emit();
+                }
+            } else if !self.check(&token::CloseDelim(token::Paren)) {
+                fields.push(self.parse_pat(None)?);
+            } else {
+                break
+            }
+            trailing_comma = self.eat(&token::Comma);
+            if !trailing_comma {
+                break
+            }
+        }
+        if ddpos == Some(fields.len()) && trailing_comma {
+            // `..` needs to be followed by `)` or `, pat`, `..,)` is disallowed.
+            let msg = "trailing comma is not permitted after `..`";
+            self.struct_span_err(self.prev_span, msg)
+                .span_label(self.prev_span, msg)
+                .emit();
+        }
+        Ok((fields, ddpos, trailing_comma))
+    }
+    fn parse_pat_vec_elements(
+        &mut self,
+    ) -> PResult<'a, (Vec<P<Pat>>, Option<P<Pat>>, Vec<P<Pat>>)> {
+        let mut before = Vec::new();
+        let mut slice = None;
+        let mut after = Vec::new();
+        let mut first = true;
+        let mut before_slice = true;
+        while self.token != token::CloseDelim(token::Bracket) {
+            if first {
+                first = false;
+            } else {
+                self.expect(&token::Comma)?;
+                if self.token == token::CloseDelim(token::Bracket)
+                        && (before_slice || !after.is_empty()) {
+                    break
+                }
+            }
+            if before_slice {
+                if self.eat(&token::DotDot) {
+                    if self.check(&token::Comma) ||
+                            self.check(&token::CloseDelim(token::Bracket)) {
+                        slice = Some(P(Pat {
+                            id: ast::DUMMY_NODE_ID,
+                            node: PatKind::Wild,
+                            span: self.prev_span,
+                        }));
+                        before_slice = false;
+                    }
+                    continue
+                }
+            }
+            let subpat = self.parse_pat(None)?;
+            if before_slice && self.eat(&token::DotDot) {
+                slice = Some(subpat);
+                before_slice = false;
+            } else if before_slice {
+                before.push(subpat);
+            } else {
+                after.push(subpat);
+            }
+        }
+        Ok((before, slice, after))
+    }
+    fn parse_pat_field(
+        &mut self,
+        lo: Span,
+        attrs: Vec<Attribute>
+    ) -> PResult<'a, source_map::Spanned<ast::FieldPat>> {
+        // Check if a colon exists one ahead. This means we're parsing a fieldname.
+        let hi;
+        let (subpat, fieldname, is_shorthand) = if self.look_ahead(1, |t| t == &token::Colon) {
+            // Parsing a pattern of the form "fieldname: pat"
+            let fieldname = self.parse_field_name()?;
+            self.bump();
+            let pat = self.parse_pat(None)?;
+            hi = pat.span;
+            (pat, fieldname, false)
+        } else {
+            // Parsing a pattern of the form "(box) (ref) (mut) fieldname"
+            let is_box = self.eat_keyword(keywords::Box);
+            let boxed_span = self.span;
+            let is_ref = self.eat_keyword(keywords::Ref);
+            let is_mut = self.eat_keyword(keywords::Mut);
+            let fieldname = self.parse_ident()?;
+            hi = self.prev_span;
+            let bind_type = match (is_ref, is_mut) {
+                (true, true) => BindingMode::ByRef(Mutability::Mutable),
+                (true, false) => BindingMode::ByRef(Mutability::Immutable),
+                (false, true) => BindingMode::ByValue(Mutability::Mutable),
+                (false, false) => BindingMode::ByValue(Mutability::Immutable),
+            };
+            let fieldpat = P(Pat {
+                id: ast::DUMMY_NODE_ID,
+                node: PatKind::Ident(bind_type, fieldname, None),
+                span: boxed_span.to(hi),
+            });
+            let subpat = if is_box {
+                P(Pat {
+                    id: ast::DUMMY_NODE_ID,
+                    node: PatKind::Box(fieldpat),
+                    span: lo.to(hi),
+                })
+            } else {
+                fieldpat
+            };
+            (subpat, fieldname, true)
+        };
+        Ok(source_map::Spanned {
+            span: lo.to(hi),
+            node: ast::FieldPat {
+                ident: fieldname,
+                pat: subpat,
+                is_shorthand,
+                attrs: attrs.into(),
+           }
+        })
+    }
+    /// Parses the fields of a struct-like pattern.
+    fn parse_pat_fields(&mut self) -> PResult<'a, (Vec<source_map::Spanned<ast::FieldPat>>, bool)> {
+        let mut fields = Vec::new();
+        let mut etc = false;
+        let mut ate_comma = true;
+        let mut delayed_err: Option<DiagnosticBuilder<'a>> = None;
+        let mut etc_span = None;
+        while self.token != token::CloseDelim(token::Brace) {
+            let attrs = self.parse_outer_attributes()?;
+            let lo = self.span;
+            // check that a comma comes after every field
+            if !ate_comma {
+                let err = self.struct_span_err(self.prev_span, "expected `,`");
+                if let Some(mut delayed) = delayed_err {
+                    delayed.emit();
+                }
+                return Err(err);
+            }
+            ate_comma = false;
+            if self.check(&token::DotDot) || self.token == token::DotDotDot {
+                etc = true;
+                let mut etc_sp = self.span;
+                if self.token == token::DotDotDot { // Issue #46718
+                    // Accept `...` as if it were `..` to avoid further errors
+                    let mut err = self.struct_span_err(self.span,
+                                                       "expected field pattern, found `...`");
+                    err.span_suggestion(
+                        self.span,
+                        "to omit remaining fields, use one fewer `.`",
+                        "..".to_owned(),
+                        Applicability::MachineApplicable
+                    );
+                    err.emit();
+                }
+                self.bump();  // `..` || `...`
+                if self.token == token::CloseDelim(token::Brace) {
+                    etc_span = Some(etc_sp);
+                    break;
+                }
+                let token_str = self.this_token_descr();
+                let mut err = self.fatal(&format!("expected `}}`, found {}", token_str));
+                err.span_label(self.span, "expected `}`");
+                let mut comma_sp = None;
+                if self.token == token::Comma { // Issue #49257
+                    etc_sp = etc_sp.to(self.sess.source_map().span_until_non_whitespace(self.span));
+                    err.span_label(etc_sp,
+                                   "`..` must be at the end and cannot have a trailing comma");
+                    comma_sp = Some(self.span);
+                    self.bump();
+                    ate_comma = true;
+                }
+                etc_span = Some(etc_sp.until(self.span));
+                if self.token == token::CloseDelim(token::Brace) {
+                    // If the struct looks otherwise well formed, recover and continue.
+                    if let Some(sp) = comma_sp {
+                        err.span_suggestion_short(
+                            sp,
+                            "remove this comma",
+                            String::new(),
+                            Applicability::MachineApplicable,
+                        );
+                    }
+                    err.emit();
+                    break;
+                } else if self.token.is_ident() && ate_comma {
+                    // Accept fields coming after `..,`.
+                    // This way we avoid "pattern missing fields" errors afterwards.
+                    // We delay this error until the end in order to have a span for a
+                    // suggested fix.
+                    if let Some(mut delayed_err) = delayed_err {
+                        delayed_err.emit();
+                        return Err(err);
+                    } else {
+                        delayed_err = Some(err);
+                    }
+                } else {
+                    if let Some(mut err) = delayed_err {
+                        err.emit();
+                    }
+                    return Err(err);
+                }
+            }
+            fields.push(match self.parse_pat_field(lo, attrs) {
+                Ok(field) => field,
+                Err(err) => {
+                    if let Some(mut delayed_err) = delayed_err {
+                        delayed_err.emit();
+                    }
+                    return Err(err);
+                }
+            });
+            ate_comma = self.eat(&token::Comma);
+        }
+        if let Some(mut err) = delayed_err {
+            if let Some(etc_span) = etc_span {
+                err.multipart_suggestion(
+                    "move the `..` to the end of the field list",
+                    vec![
+                        (etc_span, String::new()),
+                        (self.span, format!("{}.. }}", if ate_comma { "" } else { ", " })),
+                    ],
+                    Applicability::MachineApplicable,
+                );
+            }
+            err.emit();
+        }
+        return Ok((fields, etc));
+    }
+    fn parse_pat_range_end(&mut self) -> PResult<'a, P<Expr>> {
+        if self.token.is_path_start() {
+            let lo = self.span;
+            let (qself, path) = if self.eat_lt() {
+                // Parse a qualified path
+                let (qself, path) = self.parse_qpath(PathStyle::Expr)?;
+                (Some(qself), path)
+            } else {
+                // Parse an unqualified path
+                (None, self.parse_path(PathStyle::Expr)?)
+            };
+            let hi = self.prev_span;
+            Ok(self.mk_expr(lo.to(hi), ExprKind::Path(qself, path), ThinVec::new()))
+        } else {
+            self.parse_literal_maybe_minus()
+        }
+    }
+    // helper function to decide whether to parse as ident binding or to try to do
+    // something more complex like range patterns
+    fn parse_as_ident(&mut self) -> bool {
+        self.look_ahead(1, |t| match *t {
+            token::OpenDelim(token::Paren) | token::OpenDelim(token::Brace) |
+            token::DotDotDot | token::DotDotEq | token::ModSep | token::Not => Some(false),
+            // ensure slice patterns [a, b.., c] and [a, b, c..] don't go into the
+            // range pattern branch
+            token::DotDot => None,
+            _ => Some(true),
+        }).unwrap_or_else(|| self.look_ahead(2, |t| match *t {
+            token::Comma | token::CloseDelim(token::Bracket) => true,
+            _ => false,
+        }))
+    }
+    /// A wrapper around `parse_pat` with some special error handling for the
+    /// "top-level" patterns in a match arm, `for` loop, `let`, &c. (in contrast
+    /// to subpatterns within such).
+    fn parse_top_level_pat(&mut self) -> PResult<'a, P<Pat>> {
+        let pat = self.parse_pat(None)?;
+        if self.token == token::Comma {
+            // An unexpected comma after a top-level pattern is a clue that the
+            // user (perhaps more accustomed to some other language) forgot the
+            // parentheses in what should have been a tuple pattern; return a
+            // suggestion-enhanced error here rather than choking on the comma
+            // later.
+            let comma_span = self.span;
+            self.bump();
+            if let Err(mut err) = self.parse_pat_list() {
+                // We didn't expect this to work anyway; we just wanted
+                // to advance to the end of the comma-sequence so we know
+                // the span to suggest parenthesizing
+                err.cancel();
+            }
+            let seq_span = pat.span.to(self.prev_span);
+            let mut err = self.struct_span_err(comma_span,
+                                               "unexpected `,` in pattern");
+            if let Ok(seq_snippet) = self.sess.source_map().span_to_snippet(seq_span) {
+                err.span_suggestion(
+                    seq_span,
+                    "try adding parentheses to match on a tuple..",
+                    format!("({})", seq_snippet),
+                    Applicability::MachineApplicable
+                ).span_suggestion(
+                    seq_span,
+                    "..or a vertical bar to match on multiple alternatives",
+                    format!("{}", seq_snippet.replace(",", " |")),
+                    Applicability::MachineApplicable
+                );
+            }
+            return Err(err);
+        }
+        Ok(pat)
+    }
+    /// Parses a pattern.
+    pub fn parse_pat(&mut self, expected: Option<&'static str>) -> PResult<'a, P<Pat>> {
+        self.parse_pat_with_range_pat(true, expected)
+    }
+    /// Parses a pattern, with a setting whether modern range patterns (e.g., `a..=b`, `a..b` are
+    /// allowed).
+    fn parse_pat_with_range_pat(
+        &mut self,
+        allow_range_pat: bool,
+        expected: Option<&'static str>,
+    ) -> PResult<'a, P<Pat>> {
+        maybe_whole!(self, NtPat, |x| x);
+        let lo = self.span;
+        let pat;
+        match self.token {
+            token::BinOp(token::And) | token::AndAnd => {
+                // Parse &pat / &mut pat
+                self.expect_and()?;
+                let mutbl = self.parse_mutability();
+                if let token::Lifetime(ident) = self.token {
+                    let mut err = self.fatal(&format!("unexpected lifetime `{}` in pattern",
+                                                      ident));
+                    err.span_label(self.span, "unexpected lifetime");
+                    return Err(err);
+                }
+                let subpat = self.parse_pat_with_range_pat(false, expected)?;
+                pat = PatKind::Ref(subpat, mutbl);
+            }
+            token::OpenDelim(token::Paren) => {
+                // Parse (pat,pat,pat,...) as tuple pattern
+                let (fields, ddpos, trailing_comma) = self.parse_parenthesized_pat_list()?;
+                pat = if fields.len() == 1 && ddpos.is_none() && !trailing_comma {
+                    PatKind::Paren(fields.into_iter().nth(0).unwrap())
+                } else {
+                    PatKind::Tuple(fields, ddpos)
+                };
+            }
+            token::OpenDelim(token::Bracket) => {
+                // Parse [pat,pat,...] as slice pattern
+                self.bump();
+                let (before, slice, after) = self.parse_pat_vec_elements()?;
+                self.expect(&token::CloseDelim(token::Bracket))?;
+                pat = PatKind::Slice(before, slice, after);
+            }
+            // At this point, token != &, &&, (, [
+            _ => if self.eat_keyword(keywords::Underscore) {
+                // Parse _
+                pat = PatKind::Wild;
+            } else if self.eat_keyword(keywords::Mut) {
+                // Parse mut ident @ pat / mut ref ident @ pat
+                let mutref_span = self.prev_span.to(self.span);
+                let binding_mode = if self.eat_keyword(keywords::Ref) {
+                    self.diagnostic()
+                        .struct_span_err(mutref_span, "the order of `mut` and `ref` is incorrect")
+                        .span_suggestion(
+                            mutref_span,
+                            "try switching the order",
+                            "ref mut".into(),
+                            Applicability::MachineApplicable
+                        ).emit();
+                    BindingMode::ByRef(Mutability::Mutable)
+                } else {
+                    BindingMode::ByValue(Mutability::Mutable)
+                };
+                pat = self.parse_pat_ident(binding_mode)?;
+            } else if self.eat_keyword(keywords::Ref) {
+                // Parse ref ident @ pat / ref mut ident @ pat
+                let mutbl = self.parse_mutability();
+                pat = self.parse_pat_ident(BindingMode::ByRef(mutbl))?;
+            } else if self.eat_keyword(keywords::Box) {
+                // Parse box pat
+                let subpat = self.parse_pat_with_range_pat(false, None)?;
+                pat = PatKind::Box(subpat);
+            } else if self.token.is_ident() && !self.token.is_reserved_ident() &&
+                      self.parse_as_ident() {
+                // Parse ident @ pat
+                // This can give false positives and parse nullary enums,
+                // they are dealt with later in resolve
+                let binding_mode = BindingMode::ByValue(Mutability::Immutable);
+                pat = self.parse_pat_ident(binding_mode)?;
+            } else if self.token.is_path_start() {
+                // Parse pattern starting with a path
+                let (qself, path) = if self.eat_lt() {
+                    // Parse a qualified path
+                    let (qself, path) = self.parse_qpath(PathStyle::Expr)?;
+                    (Some(qself), path)
+                } else {
+                    // Parse an unqualified path
+                    (None, self.parse_path(PathStyle::Expr)?)
+                };
+                match self.token {
+                    token::Not if qself.is_none() => {
+                        // Parse macro invocation
+                        self.bump();
+                        let (delim, tts) = self.expect_delimited_token_tree()?;
+                        let mac = respan(lo.to(self.prev_span), Mac_ { path, tts, delim });
+                        pat = PatKind::Mac(mac);
+                    }
+                    token::DotDotDot | token::DotDotEq | token::DotDot => {
+                        let end_kind = match self.token {
+                            token::DotDot => RangeEnd::Excluded,
+                            token::DotDotDot => RangeEnd::Included(RangeSyntax::DotDotDot),
+                            token::DotDotEq => RangeEnd::Included(RangeSyntax::DotDotEq),
+                            _ => panic!("can only parse `..`/`...`/`..=` for ranges \
+                                         (checked above)"),
+                        };
+                        let op_span = self.span;
+                        // Parse range
+                        let span = lo.to(self.prev_span);
+                        let begin = self.mk_expr(span, ExprKind::Path(qself, path), ThinVec::new());
+                        self.bump();
+                        let end = self.parse_pat_range_end()?;
+                        let op = Spanned { span: op_span, node: end_kind };
+                        pat = PatKind::Range(begin, end, op);
+                    }
+                    token::OpenDelim(token::Brace) => {
+                        if qself.is_some() {
+                            let msg = "unexpected `{` after qualified path";
+                            let mut err = self.fatal(msg);
+                            err.span_label(self.span, msg);
+                            return Err(err);
+                        }
+                        // Parse struct pattern
+                        self.bump();
+                        let (fields, etc) = self.parse_pat_fields().unwrap_or_else(|mut e| {
+                            e.emit();
+                            self.recover_stmt();
+                            (vec![], false)
+                        });
+                        self.bump();
+                        pat = PatKind::Struct(path, fields, etc);
+                    }
+                    token::OpenDelim(token::Paren) => {
+                        if qself.is_some() {
+                            let msg = "unexpected `(` after qualified path";
+                            let mut err = self.fatal(msg);
+                            err.span_label(self.span, msg);
+                            return Err(err);
+                        }
+                        // Parse tuple struct or enum pattern
+                        let (fields, ddpos, _) = self.parse_parenthesized_pat_list()?;
+                        pat = PatKind::TupleStruct(path, fields, ddpos)
+                    }
+                    _ => pat = PatKind::Path(qself, path),
+                }
+            } else {
+                // Try to parse everything else as literal with optional minus
+                match self.parse_literal_maybe_minus() {
+                    Ok(begin) => {
+                        let op_span = self.span;
+                        if self.check(&token::DotDot) || self.check(&token::DotDotEq) ||
+                                self.check(&token::DotDotDot) {
+                            let end_kind = if self.eat(&token::DotDotDot) {
+                                RangeEnd::Included(RangeSyntax::DotDotDot)
+                            } else if self.eat(&token::DotDotEq) {
+                                RangeEnd::Included(RangeSyntax::DotDotEq)
+                            } else if self.eat(&token::DotDot) {
+                                RangeEnd::Excluded
+                            } else {
+                                panic!("impossible case: we already matched \
+                                        on a range-operator token")
+                            };
+                            let end = self.parse_pat_range_end()?;
+                            let op = Spanned { span: op_span, node: end_kind };
+                            pat = PatKind::Range(begin, end, op);
+                        } else {
+                            pat = PatKind::Lit(begin);
+                        }
+                    }
+                    Err(mut err) => {
+                        self.cancel(&mut err);
+                        let expected = expected.unwrap_or("pattern");
+                        let msg = format!(
+                            "expected {}, found {}",
+                            expected,
+                            self.this_token_descr(),
+                        );
+                        let mut err = self.fatal(&msg);
+                        err.span_label(self.span, format!("expected {}", expected));
+                        return Err(err);
+                    }
+                }
+            }
+        }
+        let pat = Pat { node: pat, span: lo.to(self.prev_span), id: ast::DUMMY_NODE_ID };
+        let pat = self.maybe_recover_from_bad_qpath(pat, true)?;
+        if !allow_range_pat {
+            match pat.node {
+                PatKind::Range(
+                    _, _, Spanned { node: RangeEnd::Included(RangeSyntax::DotDotDot), .. }
+                ) => {},
+                PatKind::Range(..) => {
+                    let mut err = self.struct_span_err(
+                        pat.span,
+                        "the range pattern here has ambiguous interpretation",
+                    );
+                    err.span_suggestion(
+                        pat.span,
+                        "add parentheses to clarify the precedence",
+                        format!("({})", pprust::pat_to_string(&pat)),
+                        // "ambiguous interpretation" implies that we have to be guessing
+                        Applicability::MaybeIncorrect
+                    );
+                    return Err(err);
+                }
+                _ => {}
+            }
+        }
+        Ok(P(pat))
+    }
+    /// Parses `ident` or `ident @ pat`.
+    /// used by the copy foo and ref foo patterns to give a good
+    /// error message when parsing mistakes like `ref foo(a, b)`.
+    fn parse_pat_ident(&mut self,
+                       binding_mode: ast::BindingMode)
+                       -> PResult<'a, PatKind> {
+        let ident = self.parse_ident()?;
+        let sub = if self.eat(&token::At) {
+            Some(self.parse_pat(Some("binding pattern"))?)
+        } else {
+            None
+        };
+        // just to be friendly, if they write something like
+        //   ref Some(i)
+        // we end up here with ( as the current token.  This shortly
+        // leads to a parse error.  Note that if there is no explicit
+        // binding mode then we do not end up here, because the lookahead
+        // will direct us over to parse_enum_variant()
+        if self.token == token::OpenDelim(token::Paren) {
+            return Err(self.span_fatal(
+                self.prev_span,
+                "expected identifier, found enum pattern"))
+        }
+        Ok(PatKind::Ident(binding_mode, ident, sub))
+    }
+    /// Parses a local variable declaration.
+    fn parse_local(&mut self, attrs: ThinVec<Attribute>) -> PResult<'a, P<Local>> {
+        let lo = self.prev_span;
+        let pat = self.parse_top_level_pat()?;
+        let (err, ty) = if self.eat(&token::Colon) {
+            // Save the state of the parser before parsing type normally, in case there is a `:`
+            // instead of an `=` typo.
+            let parser_snapshot_before_type = self.clone();
+            let colon_sp = self.prev_span;
+            match self.parse_ty() {
+                Ok(ty) => (None, Some(ty)),
+                Err(mut err) => {
+                    // Rewind to before attempting to parse the type and continue parsing
+                    let parser_snapshot_after_type = self.clone();
+                    mem::replace(self, parser_snapshot_before_type);
+                    let snippet = self.sess.source_map().span_to_snippet(pat.span).unwrap();
+                    err.span_label(pat.span, format!("while parsing the type for `{}`", snippet));
+                    (Some((parser_snapshot_after_type, colon_sp, err)), None)
+                }
+            }
+        } else {
+            (None, None)
+        };
+        let init = match (self.parse_initializer(err.is_some()), err) {
+            (Ok(init), None) => {  // init parsed, ty parsed
+                init
+            }
+            (Ok(init), Some((_, colon_sp, mut err))) => {  // init parsed, ty error
+                // Could parse the type as if it were the initializer, it is likely there was a
+                // typo in the code: `:` instead of `=`. Add suggestion and emit the error.
+                err.span_suggestion_short(
+                    colon_sp,
+                    "use `=` if you meant to assign",
+                    "=".to_string(),
+                    Applicability::MachineApplicable
+                );
+                err.emit();
+                // As this was parsed successfully, continue as if the code has been fixed for the
+                // rest of the file. It will still fail due to the emitted error, but we avoid
+                // extra noise.
+                init
+            }
+            (Err(mut init_err), Some((snapshot, _, ty_err))) => {  // init error, ty error
+                init_err.cancel();
+                // Couldn't parse the type nor the initializer, only raise the type error and
+                // return to the parser state before parsing the type as the initializer.
+                // let x: <parse_error>;
+                mem::replace(self, snapshot);
+                return Err(ty_err);
+            }
+            (Err(err), None) => {  // init error, ty parsed
+                // Couldn't parse the initializer and we're not attempting to recover a failed
+                // parse of the type, return the error.
+                return Err(err);
+            }
+        };
+        let hi = if self.token == token::Semi {
+            self.span
+        } else {
+            self.prev_span
+        };
+        Ok(P(ast::Local {
+            ty,
+            pat,
+            init,
+            id: ast::DUMMY_NODE_ID,
+            span: lo.to(hi),
+            attrs,
+        }))
+    }
+    /// Parses a structure field.
+    fn parse_name_and_ty(&mut self,
+                         lo: Span,
+                         vis: Visibility,
+                         attrs: Vec<Attribute>)
+                         -> PResult<'a, StructField> {
+        let name = self.parse_ident()?;
+        self.expect(&token::Colon)?;
+        let ty = self.parse_ty()?;
+        Ok(StructField {
+            span: lo.to(self.prev_span),
+            ident: Some(name),
+            vis,
+            id: ast::DUMMY_NODE_ID,
+            ty,
+            attrs,
+        })
+    }
+    /// Emits an expected-item-after-attributes error.
+    fn expected_item_err(&mut self, attrs: &[Attribute]) -> PResult<'a,  ()> {
+        let message = match attrs.last() {
+            Some(&Attribute { is_sugared_doc: true, .. }) => "expected item after doc comment",
+            _ => "expected item after attributes",
+        };
+        let mut err = self.diagnostic().struct_span_err(self.prev_span, message);
+        if attrs.last().unwrap().is_sugared_doc {
+            err.span_label(self.prev_span, "this doc comment doesn't document anything");
+        }
+        Err(err)
+    }
+    /// Parse a statement. This stops just before trailing semicolons on everything but items.
+    /// e.g., a `StmtKind::Semi` parses to a `StmtKind::Expr`, leaving the trailing `;` unconsumed.
+    pub fn parse_stmt(&mut self) -> PResult<'a, Option<Stmt>> {
+        Ok(self.parse_stmt_(true))
+    }
+    // Eat tokens until we can be relatively sure we reached the end of the
+    // statement. This is something of a best-effort heuristic.
+    //
+    // We terminate when we find an unmatched `}` (without consuming it).
+    fn recover_stmt(&mut self) {
+        self.recover_stmt_(SemiColonMode::Ignore, BlockMode::Ignore)
+    }
+    // If `break_on_semi` is `Break`, then we will stop consuming tokens after
+    // finding (and consuming) a `;` outside of `{}` or `[]` (note that this is
+    // approximate - it can mean we break too early due to macros, but that
+    // should only lead to sub-optimal recovery, not inaccurate parsing).
+    //
+    // If `break_on_block` is `Break`, then we will stop consuming tokens
+    // after finding (and consuming) a brace-delimited block.
+    fn recover_stmt_(&mut self, break_on_semi: SemiColonMode, break_on_block: BlockMode) {
+        let mut brace_depth = 0;
+        let mut bracket_depth = 0;
+        let mut in_block = false;
+        debug!("recover_stmt_ enter loop (semi={:?}, block={:?})",
+               break_on_semi, break_on_block);
+        loop {
+            debug!("recover_stmt_ loop {:?}", self.token);
+            match self.token {
+                token::OpenDelim(token::DelimToken::Brace) => {
+                    brace_depth += 1;
+                    self.bump();
+                    if break_on_block == BlockMode::Break &&
+                       brace_depth == 1 &&
+                       bracket_depth == 0 {
+                        in_block = true;
+                    }
+                }
+                token::OpenDelim(token::DelimToken::Bracket) => {
+                    bracket_depth += 1;
+                    self.bump();
+                }
+                token::CloseDelim(token::DelimToken::Brace) => {
+                    if brace_depth == 0 {
+                        debug!("recover_stmt_ return - close delim {:?}", self.token);
+                        break;
+                    }
+                    brace_depth -= 1;
+                    self.bump();
+                    if in_block && bracket_depth == 0 && brace_depth == 0 {
+                        debug!("recover_stmt_ return - block end {:?}", self.token);
+                        break;
+                    }
+                }
+                token::CloseDelim(token::DelimToken::Bracket) => {
+                    bracket_depth -= 1;
+                    if bracket_depth < 0 {
+                        bracket_depth = 0;
+                    }
+                    self.bump();
+                }
+                token::Eof => {
+                    debug!("recover_stmt_ return - Eof");
+                    break;
+                }
+                token::Semi => {
+                    self.bump();
+                    if break_on_semi == SemiColonMode::Break &&
+                       brace_depth == 0 &&
+                       bracket_depth == 0 {
+                        debug!("recover_stmt_ return - Semi");
+                        break;
+                    }
+                }
+                token::Comma => {
+                    if break_on_semi == SemiColonMode::Comma &&
+                       brace_depth == 0 &&
+                       bracket_depth == 0 {
+                        debug!("recover_stmt_ return - Semi");
+                        break;
+                    } else {
+                        self.bump();
+                    }
+                }
+                _ => {
+                    self.bump()
+                }
+            }
+        }
+    }
+    fn parse_stmt_(&mut self, macro_legacy_warnings: bool) -> Option<Stmt> {
+        self.parse_stmt_without_recovery(macro_legacy_warnings).unwrap_or_else(|mut e| {
+            e.emit();
+            self.recover_stmt_(SemiColonMode::Break, BlockMode::Ignore);
+            None
+        })
+    }
+    fn is_async_block(&mut self) -> bool {
+        self.token.is_keyword(keywords::Async) &&
+        (
+            ( // `async move {`
+                self.look_ahead(1, |t| t.is_keyword(keywords::Move)) &&
+                self.look_ahead(2, |t| *t == token::OpenDelim(token::Brace))
+            ) || ( // `async {`
+                self.look_ahead(1, |t| *t == token::OpenDelim(token::Brace))
+            )
+        )
+    }
+    fn is_do_catch_block(&mut self) -> bool {
+        self.token.is_keyword(keywords::Do) &&
+        self.look_ahead(1, |t| t.is_keyword(keywords::Catch)) &&
+        self.look_ahead(2, |t| *t == token::OpenDelim(token::Brace)) &&
+        !self.restrictions.contains(Restrictions::NO_STRUCT_LITERAL)
+    }
+    fn is_try_block(&mut self) -> bool {
+        self.token.is_keyword(keywords::Try) &&
+        self.look_ahead(1, |t| *t == token::OpenDelim(token::Brace)) &&
+        self.span.rust_2018() &&
+        // prevent `while try {} {}`, `if try {} {} else {}`, etc.
+        !self.restrictions.contains(Restrictions::NO_STRUCT_LITERAL)
+    }
+    fn is_union_item(&self) -> bool {
+        self.token.is_keyword(keywords::Union) &&
+        self.look_ahead(1, |t| t.is_ident() && !t.is_reserved_ident())
+    }
+    fn is_crate_vis(&self) -> bool {
+        self.token.is_keyword(keywords::Crate) && self.look_ahead(1, |t| t != &token::ModSep)
+    }
+    fn is_existential_type_decl(&self) -> bool {
+        self.token.is_keyword(keywords::Existential) &&
+        self.look_ahead(1, |t| t.is_keyword(keywords::Type))
+    }
+    fn is_auto_trait_item(&mut self) -> bool {
+        // auto trait
+        (self.token.is_keyword(keywords::Auto)
+            && self.look_ahead(1, |t| t.is_keyword(keywords::Trait)))
+        || // unsafe auto trait
+        (self.token.is_keyword(keywords::Unsafe) &&
+         self.look_ahead(1, |t| t.is_keyword(keywords::Auto)) &&
+         self.look_ahead(2, |t| t.is_keyword(keywords::Trait)))
+    }
+    fn eat_macro_def(&mut self, attrs: &[Attribute], vis: &Visibility, lo: Span)
+                     -> PResult<'a, Option<P<Item>>> {
+        let token_lo = self.span;
+        let (ident, def) = match self.token {
+            token::Ident(ident, false) if ident.name == keywords::Macro.name() => {
+                self.bump();
+                let ident = self.parse_ident()?;
+                let tokens = if self.check(&token::OpenDelim(token::Brace)) {
+                    match self.parse_token_tree() {
+                        TokenTree::Delimited(_, _, tts) => tts,
+                        _ => unreachable!(),
+                    }
+                } else if self.check(&token::OpenDelim(token::Paren)) {
+                    let args = self.parse_token_tree();
+                    let body = if self.check(&token::OpenDelim(token::Brace)) {
+                        self.parse_token_tree()
+                    } else {
+                        self.unexpected()?;
+                        unreachable!()
+                    };
+                    TokenStream::new(vec![
+                        args.into(),
+                        TokenTree::Token(token_lo.to(self.prev_span), token::FatArrow).into(),
+                        body.into(),
+                    ])
+                } else {
+                    self.unexpected()?;
+                    unreachable!()
+                };
+                (ident, ast::MacroDef { tokens: tokens.into(), legacy: false })
+            }
+            token::Ident(ident, _) if ident.name == "macro_rules" &&
+                                   self.look_ahead(1, |t| *t == token::Not) => {
+                let prev_span = self.prev_span;
+                self.complain_if_pub_macro(&vis.node, prev_span);
+                self.bump();
+                self.bump();
+                let ident = self.parse_ident()?;
+                let (delim, tokens) = self.expect_delimited_token_tree()?;
+                if delim != MacDelimiter::Brace {
+                    if !self.eat(&token::Semi) {
+                        let msg = "macros that expand to items must either \
+                                   be surrounded with braces or followed by a semicolon";
+                        self.span_err(self.prev_span, msg);
+                    }
+                }
+                (ident, ast::MacroDef { tokens: tokens, legacy: true })
+            }
+            _ => return Ok(None),
+        };
+        let span = lo.to(self.prev_span);
+        Ok(Some(self.mk_item(span, ident, ItemKind::MacroDef(def), vis.clone(), attrs.to_vec())))
+    }
+    fn parse_stmt_without_recovery(&mut self,
+                                   macro_legacy_warnings: bool)
+                                   -> PResult<'a, Option<Stmt>> {
+        maybe_whole!(self, NtStmt, |x| Some(x));
+        let attrs = self.parse_outer_attributes()?;
+        let lo = self.span;
+        Ok(Some(if self.eat_keyword(keywords::Let) {
+            Stmt {
+                id: ast::DUMMY_NODE_ID,
+                node: StmtKind::Local(self.parse_local(attrs.into())?),
+                span: lo.to(self.prev_span),
+            }
+        } else if let Some(macro_def) = self.eat_macro_def(
+            &attrs,
+            &source_map::respan(lo, VisibilityKind::Inherited),
+            lo,
+        )? {
+            Stmt {
+                id: ast::DUMMY_NODE_ID,
+                node: StmtKind::Item(macro_def),
+                span: lo.to(self.prev_span),
+            }
+        // Starts like a simple path, being careful to avoid contextual keywords
+        // such as a union items, item with `crate` visibility or auto trait items.
+        // Our goal here is to parse an arbitrary path `a::b::c` but not something that starts
+        // like a path (1 token), but it fact not a path.
+        // `union::b::c` - path, `union U { ... }` - not a path.
+        // `crate::b::c` - path, `crate struct S;` - not a path.
+        } else if self.token.is_path_start() &&
+                  !self.token.is_qpath_start() &&
+                  !self.is_union_item() &&
+                  !self.is_crate_vis() &&
+                  !self.is_existential_type_decl() &&
+                  !self.is_auto_trait_item() {
+            let pth = self.parse_path(PathStyle::Expr)?;
+            if !self.eat(&token::Not) {
+                let expr = if self.check(&token::OpenDelim(token::Brace)) {
+                    self.parse_struct_expr(lo, pth, ThinVec::new())?
+                } else {
+                    let hi = self.prev_span;
+                    self.mk_expr(lo.to(hi), ExprKind::Path(None, pth), ThinVec::new())
+                };
+                let expr = self.with_res(Restrictions::STMT_EXPR, |this| {
+                    let expr = this.parse_dot_or_call_expr_with(expr, lo, attrs.into())?;
+                    this.parse_assoc_expr_with(0, LhsExpr::AlreadyParsed(expr))
+                })?;
+                return Ok(Some(Stmt {
+                    id: ast::DUMMY_NODE_ID,
+                    node: StmtKind::Expr(expr),
+                    span: lo.to(self.prev_span),
+                }));
+            }
+            // it's a macro invocation
+            let id = match self.token {
+                token::OpenDelim(_) => keywords::Invalid.ident(), // no special identifier
+                _ => self.parse_ident()?,
+            };
+            // check that we're pointing at delimiters (need to check
+            // again after the `if`, because of `parse_ident`
+            // consuming more tokens).
+            match self.token {
+                token::OpenDelim(_) => {}
+                _ => {
+                    // we only expect an ident if we didn't parse one
+                    // above.
+                    let ident_str = if id.name == keywords::Invalid.name() {
+                        "identifier, "
+                    } else {
+                        ""
+                    };
+                    let tok_str = self.this_token_descr();
+                    let mut err = self.fatal(&format!("expected {}`(` or `{{`, found {}",
+                                                      ident_str,
+                                                      tok_str));
+                    err.span_label(self.span, format!("expected {}`(` or `{{`", ident_str));
+                    return Err(err)
+                },
+            }
+            let (delim, tts) = self.expect_delimited_token_tree()?;
+            let hi = self.prev_span;
+            let style = if delim == MacDelimiter::Brace {
+                MacStmtStyle::Braces
+            } else {
+                MacStmtStyle::NoBraces
+            };
+            if id.name == keywords::Invalid.name() {
+                let mac = respan(lo.to(hi), Mac_ { path: pth, tts, delim });
+                let node = if delim == MacDelimiter::Brace ||
+                              self.token == token::Semi || self.token == token::Eof {
+                    StmtKind::Mac(P((mac, style, attrs.into())))
+                }
+                // We used to incorrectly stop parsing macro-expanded statements here.
+                // If the next token will be an error anyway but could have parsed with the
+                // earlier behavior, stop parsing here and emit a warning to avoid breakage.
+                else if macro_legacy_warnings && self.token.can_begin_expr() && match self.token {
+                    // These can continue an expression, so we can't stop parsing and warn.
+                    token::OpenDelim(token::Paren) | token::OpenDelim(token::Bracket) |
+                    token::BinOp(token::Minus) | token::BinOp(token::Star) |
+                    token::BinOp(token::And) | token::BinOp(token::Or) |
+                    token::AndAnd | token::OrOr |
+                    token::DotDot | token::DotDotDot | token::DotDotEq => false,
+                    _ => true,
+                } {
+                    self.warn_missing_semicolon();
+                    StmtKind::Mac(P((mac, style, attrs.into())))
+                } else {
+                    let e = self.mk_mac_expr(lo.to(hi), mac.node, ThinVec::new());
+                    let e = self.parse_dot_or_call_expr_with(e, lo, attrs.into())?;
+                    let e = self.parse_assoc_expr_with(0, LhsExpr::AlreadyParsed(e))?;
+                    StmtKind::Expr(e)
+                };
+                Stmt {
+                    id: ast::DUMMY_NODE_ID,
+                    span: lo.to(hi),
+                    node,
+                }
+            } else {
+                // if it has a special ident, it's definitely an item
+                //
+                // Require a semicolon or braces.
+                if style != MacStmtStyle::Braces {
+                    if !self.eat(&token::Semi) {
+                        self.span_err(self.prev_span,
+                                      "macros that expand to items must \
+                                       either be surrounded with braces or \
+                                       followed by a semicolon");
+                    }
+                }
+                let span = lo.to(hi);
+                Stmt {
+                    id: ast::DUMMY_NODE_ID,
+                    span,
+                    node: StmtKind::Item({
+                        self.mk_item(
+                            span, id /*id is good here*/,
+                            ItemKind::Mac(respan(span, Mac_ { path: pth, tts, delim })),
+                            respan(lo, VisibilityKind::Inherited),
+                            attrs)
+                    }),
+                }
+            }
+        } else {
+            // FIXME: Bad copy of attrs
+            let old_directory_ownership =
+                mem::replace(&mut self.directory.ownership, DirectoryOwnership::UnownedViaBlock);
+            let item = self.parse_item_(attrs.clone(), false, true)?;
+            self.directory.ownership = old_directory_ownership;
+            match item {
+                Some(i) => Stmt {
+                    id: ast::DUMMY_NODE_ID,
+                    span: lo.to(i.span),
+                    node: StmtKind::Item(i),
+                },
+                None => {
+                    let unused_attrs = |attrs: &[Attribute], s: &mut Self| {
+                        if !attrs.is_empty() {
+                            if s.prev_token_kind == PrevTokenKind::DocComment {
+                                s.span_fatal_err(s.prev_span, Error::UselessDocComment).emit();
+                            } else if attrs.iter().any(|a| a.style == AttrStyle::Outer) {
+                                s.span_err(s.span, "expected statement after outer attribute");
+                            }
+                        }
+                    };
+                    // Do not attempt to parse an expression if we're done here.
+                    if self.token == token::Semi {
+                        unused_attrs(&attrs, self);
+                        self.bump();
+                        return Ok(None);
+                    }
+                    if self.token == token::CloseDelim(token::Brace) {
+                        unused_attrs(&attrs, self);
+                        return Ok(None);
+                    }
+                    // Remainder are line-expr stmts.
+                    let e = self.parse_expr_res(
+                        Restrictions::STMT_EXPR, Some(attrs.into()))?;
+                    Stmt {
+                        id: ast::DUMMY_NODE_ID,
+                        span: lo.to(e.span),
+                        node: StmtKind::Expr(e),
+                    }
+                }
+            }
+        }))
+    }
+    /// Checks if this expression is a successfully parsed statement.
+    fn expr_is_complete(&mut self, e: &Expr) -> bool {
+        self.restrictions.contains(Restrictions::STMT_EXPR) &&
+            !classify::expr_requires_semi_to_be_stmt(e)
+    }
+    /// Parses a block. No inner attributes are allowed.
+    pub fn parse_block(&mut self) -> PResult<'a, P<Block>> {
+        maybe_whole!(self, NtBlock, |x| x);
+        let lo = self.span;
+        if !self.eat(&token::OpenDelim(token::Brace)) {
+            let sp = self.span;
+            let tok = self.this_token_descr();
+            let mut e = self.span_fatal(sp, &format!("expected `{{`, found {}", tok));
+            let do_not_suggest_help =
+                self.token.is_keyword(keywords::In) || self.token == token::Colon;
+            if self.token.is_ident_named("and") {
+                e.span_suggestion_short(
+                    self.span,
+                    "use `&&` instead of `and` for the boolean operator",
+                    "&&".to_string(),
+                    Applicability::MaybeIncorrect,
+                );
+            }
+            if self.token.is_ident_named("or") {
+                e.span_suggestion_short(
+                    self.span,
+                    "use `||` instead of `or` for the boolean operator",
+                    "||".to_string(),
+                    Applicability::MaybeIncorrect,
+                );
+            }
+            // Check to see if the user has written something like
+            //
+            //    if (cond)
+            //      bar;
+            //
+            // Which is valid in other languages, but not Rust.
+            match self.parse_stmt_without_recovery(false) {
+                Ok(Some(stmt)) => {
+                    if self.look_ahead(1, |t| t == &token::OpenDelim(token::Brace))
+                        || do_not_suggest_help {
+                        // if the next token is an open brace (e.g., `if a b {`), the place-
+                        // inside-a-block suggestion would be more likely wrong than right
+                        e.span_label(sp, "expected `{`");
+                        return Err(e);
+                    }
+                    let mut stmt_span = stmt.span;
+                    // expand the span to include the semicolon, if it exists
+                    if self.eat(&token::Semi) {
+                        stmt_span = stmt_span.with_hi(self.prev_span.hi());
+                    }
+                    let sugg = pprust::to_string(|s| {
+                        use crate::print::pprust::{PrintState, INDENT_UNIT};
+                        s.ibox(INDENT_UNIT)?;
+                        s.bopen()?;
+                        s.print_stmt(&stmt)?;
+                        s.bclose_maybe_open(stmt.span, INDENT_UNIT, false)
+                    });
+                    e.span_suggestion(
+                        stmt_span,
+                        "try placing this code inside a block",
+                        sugg,
+                        // speculative, has been misleading in the past (closed Issue #46836)
+                        Applicability::MaybeIncorrect
+                    );
+                }
+                Err(mut e) => {
+                    self.recover_stmt_(SemiColonMode::Break, BlockMode::Ignore);
+                    self.cancel(&mut e);
+                }
+                _ => ()
+            }
+            e.span_label(sp, "expected `{`");
+            return Err(e);
+        }
+        self.parse_block_tail(lo, BlockCheckMode::Default)
+    }
+    /// Parses a block. Inner attributes are allowed.
+    fn parse_inner_attrs_and_block(&mut self) -> PResult<'a, (Vec<Attribute>, P<Block>)> {
+        maybe_whole!(self, NtBlock, |x| (Vec::new(), x));
+        let lo = self.span;
+        self.expect(&token::OpenDelim(token::Brace))?;
+        Ok((self.parse_inner_attributes()?,
+            self.parse_block_tail(lo, BlockCheckMode::Default)?))
+    }
+    /// Parses the rest of a block expression or function body.
+    /// Precondition: already parsed the '{'.
+    fn parse_block_tail(&mut self, lo: Span, s: BlockCheckMode) -> PResult<'a, P<Block>> {
+        let mut stmts = vec![];
+        while !self.eat(&token::CloseDelim(token::Brace)) {
+            let stmt = match self.parse_full_stmt(false) {
+                Err(mut err) => {
+                    err.emit();
+                    self.recover_stmt_(SemiColonMode::Ignore, BlockMode::Ignore);
+                    Some(Stmt {
+                        id: ast::DUMMY_NODE_ID,
+                        node: StmtKind::Expr(DummyResult::raw_expr(self.span, true)),
+                        span: self.span,
+                    })
+                }
+                Ok(stmt) => stmt,
+            };
+            if let Some(stmt) = stmt {
+                stmts.push(stmt);
+            } else if self.token == token::Eof {
+                break;
+            } else {
+                // Found only `;` or `}`.
+                continue;
+            };
+        }
+        Ok(P(ast::Block {
+            stmts,
+            id: ast::DUMMY_NODE_ID,
+            rules: s,
+            span: lo.to(self.prev_span),
+        }))
+    }
+    /// Parses a statement, including the trailing semicolon.
+    crate fn parse_full_stmt(&mut self, macro_legacy_warnings: bool) -> PResult<'a, Option<Stmt>> {
+        // skip looking for a trailing semicolon when we have an interpolated statement
+        maybe_whole!(self, NtStmt, |x| Some(x));
+        let mut stmt = match self.parse_stmt_without_recovery(macro_legacy_warnings)? {
+            Some(stmt) => stmt,
+            None => return Ok(None),
+        };
+        match stmt.node {
+            StmtKind::Expr(ref expr) if self.token != token::Eof => {
+                // expression without semicolon
+                if classify::expr_requires_semi_to_be_stmt(expr) {
+                    // Just check for errors and recover; do not eat semicolon yet.
+                    if let Err(mut e) =
+                        self.expect_one_of(&[], &[token::Semi, token::CloseDelim(token::Brace)])
+                    {
+                        e.emit();
+                        self.recover_stmt();
+                    }
+                }
+            }
+            StmtKind::Local(..) => {
+                // We used to incorrectly allow a macro-expanded let statement to lack a semicolon.
+                if macro_legacy_warnings && self.token != token::Semi {
+                    self.warn_missing_semicolon();
+                } else {
+                    self.expect_one_of(&[], &[token::Semi])?;
+                }
+            }
+            _ => {}
+        }
+        if self.eat(&token::Semi) {
+            stmt = stmt.add_trailing_semicolon();
+        }
+        stmt.span = stmt.span.with_hi(self.prev_span.hi());
+        Ok(Some(stmt))
+    }
+    fn warn_missing_semicolon(&self) {
+        self.diagnostic().struct_span_warn(self.span, {
+            &format!("expected `;`, found {}", self.this_token_descr())
+        }).note({
+            "This was erroneously allowed and will become a hard error in a future release"
+        }).emit();
+    }
+    fn err_dotdotdot_syntax(&self, span: Span) {
+        self.diagnostic().struct_span_err(span, {
+            "unexpected token: `...`"
+        }).span_suggestion(
+            span, "use `..` for an exclusive range", "..".to_owned(),
+            Applicability::MaybeIncorrect
+        ).span_suggestion(
+            span, "or `..=` for an inclusive range", "..=".to_owned(),
+            Applicability::MaybeIncorrect
+        ).emit();
+    }
+    /// Parses bounds of a type parameter `BOUND + BOUND + ...`, possibly with trailing `+`.
+    ///
+    /// ```
+    /// BOUND = TY_BOUND | LT_BOUND
+    /// LT_BOUND = LIFETIME (e.g., `'a`)
+    /// TY_BOUND = TY_BOUND_NOPAREN | (TY_BOUND_NOPAREN)
+    /// TY_BOUND_NOPAREN = [?] [for<LT_PARAM_DEFS>] SIMPLE_PATH (e.g., `?for<'a: 'b> m::Trait<'a>`)
+    /// ```
+    fn parse_generic_bounds_common(&mut self,
+                                   allow_plus: bool,
+                                   colon_span: Option<Span>) -> PResult<'a, GenericBounds> {
+        let mut bounds = Vec::new();
+        let mut negative_bounds = Vec::new();
+        let mut last_plus_span = None;
+        loop {
+            // This needs to be synchronized with `Token::can_begin_bound`.
+            let is_bound_start = self.check_path() || self.check_lifetime() ||
+                                 self.check(&token::Not) || // used for error reporting only
+                                 self.check(&token::Question) ||
+                                 self.check_keyword(keywords::For) ||
+                                 self.check(&token::OpenDelim(token::Paren));
+            if is_bound_start {
+                let lo = self.span;
+                let has_parens = self.eat(&token::OpenDelim(token::Paren));
+                let inner_lo = self.span;
+                let is_negative = self.eat(&token::Not);
+                let question = if self.eat(&token::Question) { Some(self.prev_span) } else { None };
+                if self.token.is_lifetime() {
+                    if let Some(question_span) = question {
+                        self.span_err(question_span,
+                                      "`?` may only modify trait bounds, not lifetime bounds");
+                    }
+                    bounds.push(GenericBound::Outlives(self.expect_lifetime()));
+                    if has_parens {
+                        let inner_span = inner_lo.to(self.prev_span);
+                        self.expect(&token::CloseDelim(token::Paren))?;
+                        let mut err = self.struct_span_err(
+                            lo.to(self.prev_span),
+                            "parenthesized lifetime bounds are not supported"
+                        );
+                        if let Ok(snippet) = self.sess.source_map().span_to_snippet(inner_span) {
+                            err.span_suggestion_short(
+                                lo.to(self.prev_span),
+                                "remove the parentheses",
+                                snippet.to_owned(),
+                                Applicability::MachineApplicable
+                            );
+                        }
+                        err.emit();
+                    }
+                } else {
+                    let lifetime_defs = self.parse_late_bound_lifetime_defs()?;
+                    let path = self.parse_path(PathStyle::Type)?;
+                    if has_parens {
+                        self.expect(&token::CloseDelim(token::Paren))?;
+                    }
+                    let poly_span = lo.to(self.prev_span);
+                    if is_negative {
+                        negative_bounds.push(
+                            last_plus_span.or(colon_span).unwrap()
+                                .to(poly_span));
+                    } else {
+                        let poly_trait = PolyTraitRef::new(lifetime_defs, path, poly_span);
+                        let modifier = if question.is_some() {
+                            TraitBoundModifier::Maybe
+                        } else {
+                            TraitBoundModifier::None
+                        };
+                        bounds.push(GenericBound::Trait(poly_trait, modifier));
+                    }
+                }
+            } else {
+                break
+            }
+            if !allow_plus || !self.eat_plus() {
+                break
+            } else {
+                last_plus_span = Some(self.prev_span);
+            }
+        }
+        if !negative_bounds.is_empty() {
+            let plural = negative_bounds.len() > 1;
+            let mut err = self.struct_span_err(negative_bounds,
+                                               "negative trait bounds are not supported");
+            let bound_list = colon_span.unwrap().to(self.prev_span);
+            let mut new_bound_list = String::new();
+            if !bounds.is_empty() {
+                let mut snippets = bounds.iter().map(|bound| bound.span())
+                    .map(|span| self.sess.source_map().span_to_snippet(span));
+                while let Some(Ok(snippet)) = snippets.next() {
+                    new_bound_list.push_str(" + ");
+                    new_bound_list.push_str(&snippet);
+                }
+                new_bound_list = new_bound_list.replacen(" +", ":", 1);
+            }
+            err.span_suggestion_short(bound_list,
+                                      &format!("remove the trait bound{}",
+                                              if plural { "s" } else { "" }),
+                                      new_bound_list,
+                                      Applicability::MachineApplicable);
+            err.emit();
+        }
+        return Ok(bounds);
+    }
+    fn parse_generic_bounds(&mut self, colon_span: Option<Span>) -> PResult<'a, GenericBounds> {
+        self.parse_generic_bounds_common(true, colon_span)
+    }
+    /// Parses bounds of a lifetime parameter `BOUND + BOUND + BOUND`, possibly with trailing `+`.
+    ///
+    /// ```
+    /// BOUND = LT_BOUND (e.g., `'a`)
+    /// ```
+    fn parse_lt_param_bounds(&mut self) -> GenericBounds {
+        let mut lifetimes = Vec::new();
+        while self.check_lifetime() {
+            lifetimes.push(ast::GenericBound::Outlives(self.expect_lifetime()));
+            if !self.eat_plus() {
+                break
+            }
+        }
+        lifetimes
+    }
+    /// Matches `typaram = IDENT (`?` unbound)? optbounds ( EQ ty )?`.
+    fn parse_ty_param(&mut self,
+                      preceding_attrs: Vec<Attribute>)
+                      -> PResult<'a, GenericParam> {
+        let ident = self.parse_ident()?;
+        // Parse optional colon and param bounds.
+        let bounds = if self.eat(&token::Colon) {
+            self.parse_generic_bounds(None)?
+        } else {
+            Vec::new()
+        };
+        let default = if self.eat(&token::Eq) {
+            Some(self.parse_ty()?)
+        } else {
+            None
+        };
+        Ok(GenericParam {
+            ident,
+            id: ast::DUMMY_NODE_ID,
+            attrs: preceding_attrs.into(),
+            bounds,
+            kind: GenericParamKind::Type {
+                default,
+            }
+        })
+    }
+    /// Parses the following grammar:
+    ///
+    ///     TraitItemAssocTy = Ident ["<"...">"] [":" [GenericBounds]] ["where" ...] ["=" Ty]
+    fn parse_trait_item_assoc_ty(&mut self)
+        -> PResult<'a, (Ident, TraitItemKind, ast::Generics)> {
+        let ident = self.parse_ident()?;
+        let mut generics = self.parse_generics()?;
+        // Parse optional colon and param bounds.
+        let bounds = if self.eat(&token::Colon) {
+            self.parse_generic_bounds(None)?
+        } else {
+            Vec::new()
+        };
+        generics.where_clause = self.parse_where_clause()?;
+        let default = if self.eat(&token::Eq) {
+            Some(self.parse_ty()?)
+        } else {
+            None
+        };
+        self.expect(&token::Semi)?;
+        Ok((ident, TraitItemKind::Type(bounds, default), generics))
+    }
+    fn parse_const_param(&mut self, preceding_attrs: Vec<Attribute>) -> PResult<'a, GenericParam> {
+        self.expect_keyword(keywords::Const)?;
+        let ident = self.parse_ident()?;
+        self.expect(&token::Colon)?;
+        let ty = self.parse_ty()?;
+        Ok(GenericParam {
+            ident,
+            id: ast::DUMMY_NODE_ID,
+            attrs: preceding_attrs.into(),
+            bounds: Vec::new(),
+            kind: GenericParamKind::Const {
+                ty,
+            }
+        })
+    }
+    /// Parses a (possibly empty) list of lifetime and type parameters, possibly including
+    /// a trailing comma and erroneous trailing attributes.
+    crate fn parse_generic_params(&mut self) -> PResult<'a, Vec<ast::GenericParam>> {
+        let mut params = Vec::new();
+        loop {
+            let attrs = self.parse_outer_attributes()?;
+            if self.check_lifetime() {
+                let lifetime = self.expect_lifetime();
+                // Parse lifetime parameter.
+                let bounds = if self.eat(&token::Colon) {
+                    self.parse_lt_param_bounds()
+                } else {
+                    Vec::new()
+                };
+                params.push(ast::GenericParam {
+                    ident: lifetime.ident,
+                    id: lifetime.id,
+                    attrs: attrs.into(),
+                    bounds,
+                    kind: ast::GenericParamKind::Lifetime,
+                });
+            } else if self.check_keyword(keywords::Const) {
+                // Parse const parameter.
+                params.push(self.parse_const_param(attrs)?);
+            } else if self.check_ident() {
+                // Parse type parameter.
+                params.push(self.parse_ty_param(attrs)?);
+            } else {
+                // Check for trailing attributes and stop parsing.
+                if !attrs.is_empty() {
+                    if !params.is_empty() {
+                        self.struct_span_err(
+                            attrs[0].span,
+                            &format!("trailing attribute after generic parameter"),
+                        )
+                        .span_label(attrs[0].span, "attributes must go before parameters")
+                        .emit();
+                    } else {
+                        self.struct_span_err(
+                            attrs[0].span,
+                            &format!("attribute without generic parameters"),
+                        )
+                        .span_label(
+                            attrs[0].span,
+                            "attributes are only permitted when preceding parameters",
+                        )
+                        .emit();
+                    }
+                }
+                break
+            }
+            if !self.eat(&token::Comma) {
+                break
+            }
+        }
+        Ok(params)
+    }
+    /// Parses a set of optional generic type parameter declarations. Where
+    /// clauses are not parsed here, and must be added later via
+    /// `parse_where_clause()`.
+    ///
+    /// matches generics = ( ) | ( < > ) | ( < typaramseq ( , )? > ) | ( < lifetimes ( , )? > )
+    ///                  | ( < lifetimes , typaramseq ( , )? > )
+    /// where   typaramseq = ( typaram ) | ( typaram , typaramseq )
+    fn parse_generics(&mut self) -> PResult<'a, ast::Generics> {
+        maybe_whole!(self, NtGenerics, |x| x);
+        let span_lo = self.span;
+        if self.eat_lt() {
+            let params = self.parse_generic_params()?;
+            self.expect_gt()?;
+            Ok(ast::Generics {
+                params,
+                where_clause: WhereClause {
+                    id: ast::DUMMY_NODE_ID,
+                    predicates: Vec::new(),
+                    span: syntax_pos::DUMMY_SP,
+                },
+                span: span_lo.to(self.prev_span),
+            })
+        } else {
+            Ok(ast::Generics::default())
+        }
+    }
+    /// Parses generic args (within a path segment) with recovery for extra leading angle brackets.
+    /// For the purposes of understanding the parsing logic of generic arguments, this function
+    /// can be thought of being the same as just calling `self.parse_generic_args()` if the source
+    /// had the correct amount of leading angle brackets.
+    ///
+    /// ```ignore (diagnostics)
+    /// bar::<<<<T as Foo>::Output>();
+    ///      ^^ help: remove extra angle brackets
+    /// ```
+    fn parse_generic_args_with_leaning_angle_bracket_recovery(
+        &mut self,
+        style: PathStyle,
+        lo: Span,
+    ) -> PResult<'a, (Vec<GenericArg>, Vec<TypeBinding>)> {
+        // We need to detect whether there are extra leading left angle brackets and produce an
+        // appropriate error and suggestion. This cannot be implemented by looking ahead at
+        // upcoming tokens for a matching `>` character - if there are unmatched `<` tokens
+        // then there won't be matching `>` tokens to find.
+        //
+        // To explain how this detection works, consider the following example:
+        //
+        // ```ignore (diagnostics)
+        // bar::<<<<T as Foo>::Output>();
+        //      ^^ help: remove extra angle brackets
+        // ```
+        //
+        // Parsing of the left angle brackets starts in this function. We start by parsing the
+        // `<` token (incrementing the counter of unmatched angle brackets on `Parser` via
+        // `eat_lt`):
+        //
+        // *Upcoming tokens:* `<<<<T as Foo>::Output>;`
+        // *Unmatched count:* 1
+        // *`parse_path_segment` calls deep:* 0
+        //
+        // This has the effect of recursing as this function is called if a `<` character
+        // is found within the expected generic arguments:
+        //
+        // *Upcoming tokens:* `<<<T as Foo>::Output>;`
+        // *Unmatched count:* 2
+        // *`parse_path_segment` calls deep:* 1
+        //
+        // Eventually we will have recursed until having consumed all of the `<` tokens and
+        // this will be reflected in the count:
+        //
+        // *Upcoming tokens:* `T as Foo>::Output>;`
+        // *Unmatched count:* 4
+        // `parse_path_segment` calls deep:* 3
+        //
+        // The parser will continue until reaching the first `>` - this will decrement the
+        // unmatched angle bracket count and return to the parent invocation of this function
+        // having succeeded in parsing:
+        //
+        // *Upcoming tokens:* `::Output>;`
+        // *Unmatched count:* 3
+        // *`parse_path_segment` calls deep:* 2
+        //
+        // This will continue until the next `>` character which will also return successfully
+        // to the parent invocation of this function and decrement the count:
+        //
+        // *Upcoming tokens:* `;`
+        // *Unmatched count:* 2
+        // *`parse_path_segment` calls deep:* 1
+        //
+        // At this point, this function will expect to find another matching `>` character but
+        // won't be able to and will return an error. This will continue all the way up the
+        // call stack until the first invocation:
+        //
+        // *Upcoming tokens:* `;`
+        // *Unmatched count:* 2
+        // *`parse_path_segment` calls deep:* 0
+        //
+        // In doing this, we have managed to work out how many unmatched leading left angle
+        // brackets there are, but we cannot recover as the unmatched angle brackets have
+        // already been consumed. To remedy this, we keep a snapshot of the parser state
+        // before we do the above. We can then inspect whether we ended up with a parsing error
+        // and unmatched left angle brackets and if so, restore the parser state before we
+        // consumed any `<` characters to emit an error and consume the erroneous tokens to
+        // recover by attempting to parse again.
+        //
+        // In practice, the recursion of this function is indirect and there will be other
+        // locations that consume some `<` characters - as long as we update the count when
+        // this happens, it isn't an issue.
+        let is_first_invocation = style == PathStyle::Expr;
+        // Take a snapshot before attempting to parse - we can restore this later.
+        let snapshot = if is_first_invocation {
+            Some(self.clone())
+        } else {
+            None
+        };
+        debug!("parse_generic_args_with_leading_angle_bracket_recovery: (snapshotting)");
+        match self.parse_generic_args() {
+            Ok(value) => Ok(value),
+            Err(ref mut e) if is_first_invocation && self.unmatched_angle_bracket_count > 0 => {
+                // Cancel error from being unable to find `>`. We know the error
+                // must have been this due to a non-zero unmatched angle bracket
+                // count.
+                e.cancel();
+                // Swap `self` with our backup of the parser state before attempting to parse
+                // generic arguments.
+                let snapshot = mem::replace(self, snapshot.unwrap());
+                debug!(
+                    "parse_generic_args_with_leading_angle_bracket_recovery: (snapshot failure) \
+                     snapshot.count={:?}",
+                    snapshot.unmatched_angle_bracket_count,
+                );
+                // Eat the unmatched angle brackets.
+                for _ in 0..snapshot.unmatched_angle_bracket_count {
+                    self.eat_lt();
+                }
+                // Make a span over ${unmatched angle bracket count} characters.
+                let span = lo.with_hi(
+                    lo.lo() + BytePos(snapshot.unmatched_angle_bracket_count)
+                );
+                let plural = snapshot.unmatched_angle_bracket_count > 1;
+                self.diagnostic()
+                    .struct_span_err(
+                        span,
+                        &format!(
+                            "unmatched angle bracket{}",
+                            if plural { "s" } else { "" }
+                        ),
+                    )
+                    .span_suggestion(
+                        span,
+                        &format!(
+                            "remove extra angle bracket{}",
+                            if plural { "s" } else { "" }
+                        ),
+                        String::new(),
+                        Applicability::MachineApplicable,
+                    )
+                    .emit();
+                // Try again without unmatched angle bracket characters.
+                self.parse_generic_args()
+            },
+            Err(e) => Err(e),
+        }
+    }
+    /// Parses (possibly empty) list of lifetime and type arguments and associated type bindings,
+    /// possibly including trailing comma.
+    fn parse_generic_args(&mut self) -> PResult<'a, (Vec<GenericArg>, Vec<TypeBinding>)> {
+        let mut args = Vec::new();
+        let mut bindings = Vec::new();
+        let mut misplaced_assoc_ty_bindings: Vec<Span> = Vec::new();
+        let mut assoc_ty_bindings: Vec<Span> = Vec::new();
+        let args_lo = self.span;
+        loop {
+            if self.check_lifetime() && self.look_ahead(1, |t| !t.is_like_plus()) {
+                // Parse lifetime argument.
+                args.push(GenericArg::Lifetime(self.expect_lifetime()));
+                misplaced_assoc_ty_bindings.append(&mut assoc_ty_bindings);
+            } else if self.check_ident() && self.look_ahead(1, |t| t == &token::Eq) {
+                // Parse associated type binding.
+                let lo = self.span;
+                let ident = self.parse_ident()?;
+                self.bump();
+                let ty = self.parse_ty()?;
+                let span = lo.to(self.prev_span);
+                bindings.push(TypeBinding {
+                    id: ast::DUMMY_NODE_ID,
+                    ident,
+                    ty,
+                    span,
+                });
+                assoc_ty_bindings.push(span);
+            } else if self.check_const_arg() {
+                // FIXME(const_generics): to distinguish between idents for types and consts,
+                // we should introduce a GenericArg::Ident in the AST and distinguish when
+                // lowering to the HIR. For now, idents for const args are not permitted.
+                // Parse const argument.
+                let expr = if let token::OpenDelim(token::Brace) = self.token {
+                    self.parse_block_expr(None, self.span, BlockCheckMode::Default, ThinVec::new())?
+                } else if self.token.is_ident() {
+                    // FIXME(const_generics): to distinguish between idents for types and consts,
+                    // we should introduce a GenericArg::Ident in the AST and distinguish when
+                    // lowering to the HIR. For now, idents for const args are not permitted.
+                    return Err(
+                        self.fatal("identifiers may currently not be used for const generics")
+                    );
+                } else {
+                    // FIXME(const_generics): this currently conflicts with emplacement syntax
+                    // with negative integer literals.
+                    self.parse_literal_maybe_minus()?
+                };
+                let value = AnonConst {
+                    id: ast::DUMMY_NODE_ID,
+                    value: expr,
+                };
+                args.push(GenericArg::Const(value));
+                misplaced_assoc_ty_bindings.append(&mut assoc_ty_bindings);
+            } else if self.check_type() {
+                // Parse type argument.
+                args.push(GenericArg::Type(self.parse_ty()?));
+                misplaced_assoc_ty_bindings.append(&mut assoc_ty_bindings);
+            } else {
+                break
+            }
+            if !self.eat(&token::Comma) {
+                break
+            }
+        }
+        // FIXME: we would like to report this in ast_validation instead, but we currently do not
+        // preserve ordering of generic parameters with respect to associated type binding, so we
+        // lose that information after parsing.
+        if misplaced_assoc_ty_bindings.len() > 0 {
+            let mut err = self.struct_span_err(
+                args_lo.to(self.prev_span),
+                "associated type bindings must be declared after generic parameters",
+            );
+            for span in misplaced_assoc_ty_bindings {
+                err.span_label(
+                    span,
+                    "this associated type binding should be moved after the generic parameters",
+                );
+            }
+            err.emit();
+        }
+        Ok((args, bindings))
+    }
+    /// Parses an optional where-clause and places it in `generics`.
+    ///
+    /// ```ignore (only-for-syntax-highlight)
+    /// where T : Trait<U, V> + 'b, 'a : 'b
+    /// ```
+    fn parse_where_clause(&mut self) -> PResult<'a, WhereClause> {
+        maybe_whole!(self, NtWhereClause, |x| x);
+        let mut where_clause = WhereClause {
+            id: ast::DUMMY_NODE_ID,
+            predicates: Vec::new(),
+            span: syntax_pos::DUMMY_SP,
+        };
+        if !self.eat_keyword(keywords::Where) {
+            return Ok(where_clause);
+        }
+        let lo = self.prev_span;
+        // We are considering adding generics to the `where` keyword as an alternative higher-rank
+        // parameter syntax (as in `where<'a>` or `where<T>`. To avoid that being a breaking
+        // change we parse those generics now, but report an error.
+        if self.choose_generics_over_qpath() {
+            let generics = self.parse_generics()?;
+            self.struct_span_err(
+                generics.span,
+                "generic parameters on `where` clauses are reserved for future use",
+            )
+                .span_label(generics.span, "currently unsupported")
+                .emit();
+        }
+        loop {
+            let lo = self.span;
+            if self.check_lifetime() && self.look_ahead(1, |t| !t.is_like_plus()) {
+                let lifetime = self.expect_lifetime();
+                // Bounds starting with a colon are mandatory, but possibly empty.
+                self.expect(&token::Colon)?;
+                let bounds = self.parse_lt_param_bounds();
+                where_clause.predicates.push(ast::WherePredicate::RegionPredicate(
+                    ast::WhereRegionPredicate {
+                        span: lo.to(self.prev_span),
+                        lifetime,
+                        bounds,
+                    }
+                ));
+            } else if self.check_type() {
+                // Parse optional `for<'a, 'b>`.
+                // This `for` is parsed greedily and applies to the whole predicate,
+                // the bounded type can have its own `for` applying only to it.
+                // Example 1: for<'a> Trait1<'a>: Trait2<'a /*ok*/>
+                // Example 2: (for<'a> Trait1<'a>): Trait2<'a /*not ok*/>
+                // Example 3: for<'a> for<'b> Trait1<'a, 'b>: Trait2<'a /*ok*/, 'b /*not ok*/>
+                let lifetime_defs = self.parse_late_bound_lifetime_defs()?;
+                // Parse type with mandatory colon and (possibly empty) bounds,
+                // or with mandatory equality sign and the second type.
+                let ty = self.parse_ty()?;
+                if self.eat(&token::Colon) {
+                    let bounds = self.parse_generic_bounds(None)?;
+                    where_clause.predicates.push(ast::WherePredicate::BoundPredicate(
+                        ast::WhereBoundPredicate {
+                            span: lo.to(self.prev_span),
+                            bound_generic_params: lifetime_defs,
+                            bounded_ty: ty,
+                            bounds,
+                        }
+                    ));
+                // FIXME: Decide what should be used here, `=` or `==`.
+                // FIXME: We are just dropping the binders in lifetime_defs on the floor here.
+                } else if self.eat(&token::Eq) || self.eat(&token::EqEq) {
+                    let rhs_ty = self.parse_ty()?;
+                    where_clause.predicates.push(ast::WherePredicate::EqPredicate(
+                        ast::WhereEqPredicate {
+                            span: lo.to(self.prev_span),
+                            lhs_ty: ty,
+                            rhs_ty,
+                            id: ast::DUMMY_NODE_ID,
+                        }
+                    ));
+                } else {
+                    return self.unexpected();
+                }
+            } else {
+                break
+            }
+            if !self.eat(&token::Comma) {
+                break
+            }
+        }
+        where_clause.span = lo.to(self.prev_span);
+        Ok(where_clause)
+    }
+    fn parse_fn_args(&mut self, named_args: bool, allow_variadic: bool)
+                     -> PResult<'a, (Vec<Arg> , bool)> {
+        self.expect(&token::OpenDelim(token::Paren))?;
+        let sp = self.span;
+        let mut variadic = false;
+        let (args, recovered): (Vec<Option<Arg>>, bool) =
+            self.parse_seq_to_before_end(
+                &token::CloseDelim(token::Paren),
+                SeqSep::trailing_allowed(token::Comma),
+                |p| {
+                    if p.token == token::DotDotDot {
+                        p.bump();
+                        variadic = true;
+                        if allow_variadic {
+                            if p.token != token::CloseDelim(token::Paren) {
+                                let span = p.span;
+                                p.span_err(span,
+                                    "`...` must be last in argument list for variadic function");
+                            }
+                            Ok(None)
+                        } else {
+                            let span = p.prev_span;
+                            if p.token == token::CloseDelim(token::Paren) {
+                                // continue parsing to present any further errors
+                                p.struct_span_err(
+                                    span,
+                                    "only foreign functions are allowed to be variadic"
+                                ).emit();
+                                Ok(Some(dummy_arg(span)))
+                           } else {
+                               // this function definition looks beyond recovery, stop parsing
+                                p.span_err(span,
+                                           "only foreign functions are allowed to be variadic");
+                                Ok(None)
+                            }
+                        }
+                    } else {
+                        match p.parse_arg_general(named_args, false) {
+                            Ok(arg) => Ok(Some(arg)),
+                            Err(mut e) => {
+                                e.emit();
+                                let lo = p.prev_span;
+                                // Skip every token until next possible arg or end.
+                                p.eat_to_tokens(&[&token::Comma, &token::CloseDelim(token::Paren)]);
+                                // Create a placeholder argument for proper arg count (#34264).
+                                let span = lo.to(p.prev_span);
+                                Ok(Some(dummy_arg(span)))
+                            }
+                        }
+                    }
+                }
+            )?;
+        if !recovered {
+            self.eat(&token::CloseDelim(token::Paren));
+        }
+        let args: Vec<_> = args.into_iter().filter_map(|x| x).collect();
+        if variadic && args.is_empty() {
+            self.span_err(sp,
+                          "variadic function must be declared with at least one named argument");
+        }
+        Ok((args, variadic))
+    }
+    /// Parses the argument list and result type of a function declaration.
+    fn parse_fn_decl(&mut self, allow_variadic: bool) -> PResult<'a, P<FnDecl>> {
+        let (args, variadic) = self.parse_fn_args(true, allow_variadic)?;
+        let ret_ty = self.parse_ret_ty(true)?;
+        Ok(P(FnDecl {
+            inputs: args,
+            output: ret_ty,
+            variadic,
+        }))
+    }
+    /// Returns the parsed optional self argument and whether a self shortcut was used.
+    fn parse_self_arg(&mut self) -> PResult<'a, Option<Arg>> {
+        let expect_ident = |this: &mut Self| match this.token {
+            // Preserve hygienic context.
+            token::Ident(ident, _) =>
+                { let span = this.span; this.bump(); Ident::new(ident.name, span) }
+            _ => unreachable!()
+        };
+        let isolated_self = |this: &mut Self, n| {
+            this.look_ahead(n, |t| t.is_keyword(keywords::SelfLower)) &&
+            this.look_ahead(n + 1, |t| t != &token::ModSep)
+        };
+        // Parse optional self parameter of a method.
+        // Only a limited set of initial token sequences is considered self parameters, anything
+        // else is parsed as a normal function parameter list, so some lookahead is required.
+        let eself_lo = self.span;
+        let (eself, eself_ident, eself_hi) = match self.token {
+            token::BinOp(token::And) => {
+                // &self
+                // &mut self
+                // &'lt self
+                // &'lt mut self
+                // &not_self
+                (if isolated_self(self, 1) {
+                    self.bump();
+                    SelfKind::Region(None, Mutability::Immutable)
+                } else if self.look_ahead(1, |t| t.is_keyword(keywords::Mut)) &&
+                          isolated_self(self, 2) {
+                    self.bump();
+                    self.bump();
+                    SelfKind::Region(None, Mutability::Mutable)
+                } else if self.look_ahead(1, |t| t.is_lifetime()) &&
+                          isolated_self(self, 2) {
+                    self.bump();
+                    let lt = self.expect_lifetime();
+                    SelfKind::Region(Some(lt), Mutability::Immutable)
+                } else if self.look_ahead(1, |t| t.is_lifetime()) &&
+                          self.look_ahead(2, |t| t.is_keyword(keywords::Mut)) &&
+                          isolated_self(self, 3) {
+                    self.bump();
+                    let lt = self.expect_lifetime();
+                    self.bump();
+                    SelfKind::Region(Some(lt), Mutability::Mutable)
+                } else {
+                    return Ok(None);
+                }, expect_ident(self), self.prev_span)
+            }
+            token::BinOp(token::Star) => {
+                // *self
+                // *const self
+                // *mut self
+                // *not_self
+                // Emit special error for `self` cases.
+                let msg = "cannot pass `self` by raw pointer";
+                (if isolated_self(self, 1) {
+                    self.bump();
+                    self.struct_span_err(self.span, msg)
+                        .span_label(self.span, msg)
+                        .emit();
+                    SelfKind::Value(Mutability::Immutable)
+                } else if self.look_ahead(1, |t| t.is_mutability()) &&
+                          isolated_self(self, 2) {
+                    self.bump();
+                    self.bump();
+                    self.struct_span_err(self.span, msg)
+                        .span_label(self.span, msg)
+                        .emit();
+                    SelfKind::Value(Mutability::Immutable)
+                } else {
+                    return Ok(None);
+                }, expect_ident(self), self.prev_span)
+            }
+            token::Ident(..) => {
+                if isolated_self(self, 0) {
+                    // self
+                    // self: TYPE
+                    let eself_ident = expect_ident(self);
+                    let eself_hi = self.prev_span;
+                    (if self.eat(&token::Colon) {
+                        let ty = self.parse_ty()?;
+                        SelfKind::Explicit(ty, Mutability::Immutable)
+                    } else {
+                        SelfKind::Value(Mutability::Immutable)
+                    }, eself_ident, eself_hi)
+                } else if self.token.is_keyword(keywords::Mut) &&
+                          isolated_self(self, 1) {
+                    // mut self
+                    // mut self: TYPE
+                    self.bump();
+                    let eself_ident = expect_ident(self);
+                    let eself_hi = self.prev_span;
+                    (if self.eat(&token::Colon) {
+                        let ty = self.parse_ty()?;
+                        SelfKind::Explicit(ty, Mutability::Mutable)
+                    } else {
+                        SelfKind::Value(Mutability::Mutable)
+                    }, eself_ident, eself_hi)
+                } else {
+                    return Ok(None);
+                }
+            }
+            _ => return Ok(None),
+        };
+        let eself = source_map::respan(eself_lo.to(eself_hi), eself);
+        Ok(Some(Arg::from_self(eself, eself_ident)))
+    }
+    /// Parses the parameter list and result type of a function that may have a `self` parameter.
+    fn parse_fn_decl_with_self<F>(&mut self, parse_arg_fn: F) -> PResult<'a, P<FnDecl>>
+        where F: FnMut(&mut Parser<'a>) -> PResult<'a,  Arg>,
+    {
+        self.expect(&token::OpenDelim(token::Paren))?;
+        // Parse optional self argument
+        let self_arg = self.parse_self_arg()?;
+        // Parse the rest of the function parameter list.
+        let sep = SeqSep::trailing_allowed(token::Comma);
+        let (fn_inputs, recovered) = if let Some(self_arg) = self_arg {
+            if self.check(&token::CloseDelim(token::Paren)) {
+                (vec![self_arg], false)
+            } else if self.eat(&token::Comma) {
+                let mut fn_inputs = vec![self_arg];
+                let (mut input, recovered) = self.parse_seq_to_before_end(
+                    &token::CloseDelim(token::Paren), sep, parse_arg_fn)?;
+                fn_inputs.append(&mut input);
+                (fn_inputs, recovered)
+            } else {
+                return self.unexpected();
+            }
+        } else {
+            self.parse_seq_to_before_end(&token::CloseDelim(token::Paren), sep, parse_arg_fn)?
+        };
+        if !recovered {
+            // Parse closing paren and return type.
+            self.expect(&token::CloseDelim(token::Paren))?;
+        }
+        Ok(P(FnDecl {
+            inputs: fn_inputs,
+            output: self.parse_ret_ty(true)?,
+            variadic: false
+        }))
+    }
+    /// Parses the `|arg, arg|` header of a closure.
+    fn parse_fn_block_decl(&mut self) -> PResult<'a, P<FnDecl>> {
+        let inputs_captures = {
+            if self.eat(&token::OrOr) {
+                Vec::new()
+            } else {
+                self.expect(&token::BinOp(token::Or))?;
+                let args = self.parse_seq_to_before_tokens(
+                    &[&token::BinOp(token::Or), &token::OrOr],
+                    SeqSep::trailing_allowed(token::Comma),
+                    TokenExpectType::NoExpect,
+                    |p| p.parse_fn_block_arg()
+                )?.0;
+                self.expect_or()?;
+                args
+            }
+        };
+        let output = self.parse_ret_ty(true)?;
+        Ok(P(FnDecl {
+            inputs: inputs_captures,
+            output,
+            variadic: false
+        }))
+    }
+    /// Parses the name and optional generic types of a function header.
+    fn parse_fn_header(&mut self) -> PResult<'a, (Ident, ast::Generics)> {
+        let id = self.parse_ident()?;
+        let generics = self.parse_generics()?;
+        Ok((id, generics))
+    }
+    fn mk_item(&mut self, span: Span, ident: Ident, node: ItemKind, vis: Visibility,
+               attrs: Vec<Attribute>) -> P<Item> {
+        P(Item {
+            ident,
+            attrs,
+            id: ast::DUMMY_NODE_ID,
+            node,
+            vis,
+            span,
+            tokens: None,
+        })
+    }
+    /// Parses an item-position function declaration.
+    fn parse_item_fn(&mut self,
+                     unsafety: Unsafety,
+                     asyncness: IsAsync,
+                     constness: Spanned<Constness>,
+                     abi: Abi)
+                     -> PResult<'a, ItemInfo> {
+        let (ident, mut generics) = self.parse_fn_header()?;
+        let decl = self.parse_fn_decl(false)?;
+        generics.where_clause = self.parse_where_clause()?;
+        let (inner_attrs, body) = self.parse_inner_attrs_and_block()?;
+        let header = FnHeader { unsafety, asyncness, constness, abi };
+        Ok((ident, ItemKind::Fn(decl, header, generics, body), Some(inner_attrs)))
+    }
+    /// Returns `true` if we are looking at `const ID`
+    /// (returns `false` for things like `const fn`, etc.).
+    fn is_const_item(&mut self) -> bool {
+        self.token.is_keyword(keywords::Const) &&
+            !self.look_ahead(1, |t| t.is_keyword(keywords::Fn)) &&
+            !self.look_ahead(1, |t| t.is_keyword(keywords::Unsafe))
+    }
+    /// Parses all the "front matter" for a `fn` declaration, up to
+    /// and including the `fn` keyword:
+    ///
+    /// - `const fn`
+    /// - `unsafe fn`
+    /// - `const unsafe fn`
+    /// - `extern fn`
+    /// - etc.
+    fn parse_fn_front_matter(&mut self)
+        -> PResult<'a, (
+            Spanned<Constness>,
+            Unsafety,
+            IsAsync,
+            Abi
+        )>
+    {
+        let is_const_fn = self.eat_keyword(keywords::Const);
+        let const_span = self.prev_span;
+        let unsafety = self.parse_unsafety();
+        let asyncness = self.parse_asyncness();
+        let (constness, unsafety, abi) = if is_const_fn {
+            (respan(const_span, Constness::Const), unsafety, Abi::Rust)
+        } else {
+            let abi = if self.eat_keyword(keywords::Extern) {
+                self.parse_opt_abi()?.unwrap_or(Abi::C)
+            } else {
+                Abi::Rust
+            };
+            (respan(self.prev_span, Constness::NotConst), unsafety, abi)
+        };
+        self.expect_keyword(keywords::Fn)?;
+        Ok((constness, unsafety, asyncness, abi))
+    }
+    /// Parses an impl item.
+    pub fn parse_impl_item(&mut self, at_end: &mut bool) -> PResult<'a, ImplItem> {
+        maybe_whole!(self, NtImplItem, |x| x);
+        let attrs = self.parse_outer_attributes()?;
+        let (mut item, tokens) = self.collect_tokens(|this| {
+            this.parse_impl_item_(at_end, attrs)
+        })?;
+        // See `parse_item` for why this clause is here.
+        if !item.attrs.iter().any(|attr| attr.style == AttrStyle::Inner) {
+            item.tokens = Some(tokens);
+        }
+        Ok(item)
+    }
+    fn parse_impl_item_(&mut self,
+                        at_end: &mut bool,
+                        mut attrs: Vec<Attribute>) -> PResult<'a, ImplItem> {
+        let lo = self.span;
+        let vis = self.parse_visibility(false)?;
+        let defaultness = self.parse_defaultness();
+        let (name, node, generics) = if let Some(type_) = self.eat_type() {
+            let (name, alias, generics) = type_?;
+            let kind = match alias {
+                AliasKind::Weak(typ) => ast::ImplItemKind::Type(typ),
+                AliasKind::Existential(bounds) => ast::ImplItemKind::Existential(bounds),
+            };
+            (name, kind, generics)
+        } else if self.is_const_item() {
+            // This parses the grammar:
+            //     ImplItemConst = "const" Ident ":" Ty "=" Expr ";"
+            self.expect_keyword(keywords::Const)?;
+            let name = self.parse_ident()?;
+            self.expect(&token::Colon)?;
+            let typ = self.parse_ty()?;
+            self.expect(&token::Eq)?;
+            let expr = self.parse_expr()?;
+            self.expect(&token::Semi)?;
+            (name, ast::ImplItemKind::Const(typ, expr), ast::Generics::default())
+        } else {
+            let (name, inner_attrs, generics, node) = self.parse_impl_method(&vis, at_end)?;
+            attrs.extend(inner_attrs);
+            (name, node, generics)
+        };
+        Ok(ImplItem {
+            id: ast::DUMMY_NODE_ID,
+            span: lo.to(self.prev_span),
+            ident: name,
+            vis,
+            defaultness,
+            attrs,
+            generics,
+            node,
+            tokens: None,
+        })
+    }
+    fn complain_if_pub_macro(&mut self, vis: &VisibilityKind, sp: Span) {
+        match *vis {
+            VisibilityKind::Inherited => {}
+            _ => {
+                let is_macro_rules: bool = match self.token {
+                    token::Ident(sid, _) => sid.name == Symbol::intern("macro_rules"),
+                    _ => false,
+                };
+                let mut err = if is_macro_rules {
+                    let mut err = self.diagnostic()
+                        .struct_span_err(sp, "can't qualify macro_rules invocation with `pub`");
+                    err.span_suggestion(
+                        sp,
+                        "try exporting the macro",
+                        "#[macro_export]".to_owned(),
+                        Applicability::MaybeIncorrect // speculative
+                    );
+                    err
+                } else {
+                    let mut err = self.diagnostic()
+                        .struct_span_err(sp, "can't qualify macro invocation with `pub`");
+                    err.help("try adjusting the macro to put `pub` inside the invocation");
+                    err
+                };
+                err.emit();
+            }
+        }
+    }
+    fn missing_assoc_item_kind_err(&mut self, item_type: &str, prev_span: Span)
+                                   -> DiagnosticBuilder<'a>
+    {
+        let expected_kinds = if item_type == "extern" {
+            "missing `fn`, `type`, or `static`"
+        } else {
+            "missing `fn`, `type`, or `const`"
+        };
+        // Given this code `path(`, it seems like this is not
+        // setting the visibility of a macro invocation, but rather
+        // a mistyped method declaration.
+        // Create a diagnostic pointing out that `fn` is missing.
+        //
+        // x |     pub path(&self) {
+        //   |        ^ missing `fn`, `type`, or `const`
+        //     pub  path(
+        //        ^^ `sp` below will point to this
+        let sp = prev_span.between(self.prev_span);
+        let mut err = self.diagnostic().struct_span_err(
+            sp,
+            &format!("{} for {}-item declaration",
+                     expected_kinds, item_type));
+        err.span_label(sp, expected_kinds);
+        err
+    }
+    /// Parse a method or a macro invocation in a trait impl.
+    fn parse_impl_method(&mut self, vis: &Visibility, at_end: &mut bool)
+                         -> PResult<'a, (Ident, Vec<Attribute>, ast::Generics,
+                             ast::ImplItemKind)> {
+        // code copied from parse_macro_use_or_failure... abstraction!
+        if let Some(mac) = self.parse_assoc_macro_invoc("impl", Some(vis), at_end)? {
+            // method macro
+            Ok((keywords::Invalid.ident(), vec![], ast::Generics::default(),
+                ast::ImplItemKind::Macro(mac)))
+        } else {
+            let (constness, unsafety, asyncness, abi) = self.parse_fn_front_matter()?;
+            let ident = self.parse_ident()?;
+            let mut generics = self.parse_generics()?;
+            let decl = self.parse_fn_decl_with_self(|p| p.parse_arg())?;
+            generics.where_clause = self.parse_where_clause()?;
+            *at_end = true;
+            let (inner_attrs, body) = self.parse_inner_attrs_and_block()?;
+            let header = ast::FnHeader { abi, unsafety, constness, asyncness };
+            Ok((ident, inner_attrs, generics, ast::ImplItemKind::Method(
+                ast::MethodSig { header, decl },
+                body
+            )))
+        }
+    }
+    /// Parses `trait Foo { ... }` or `trait Foo = Bar;`.
+    fn parse_item_trait(&mut self, is_auto: IsAuto, unsafety: Unsafety) -> PResult<'a, ItemInfo> {
+        let ident = self.parse_ident()?;
+        let mut tps = self.parse_generics()?;
+        // Parse optional colon and supertrait bounds.
+        let bounds = if self.eat(&token::Colon) {
+            self.parse_generic_bounds(Some(self.prev_span))?
+        } else {
+            Vec::new()
+        };
+        if self.eat(&token::Eq) {
+            // it's a trait alias
+            let bounds = self.parse_generic_bounds(None)?;
+            tps.where_clause = self.parse_where_clause()?;
+            self.expect(&token::Semi)?;
+            if is_auto == IsAuto::Yes {
+                let msg = "trait aliases cannot be `auto`";
+                self.struct_span_err(self.prev_span, msg)
+                    .span_label(self.prev_span, msg)
+                    .emit();
+            }
+            if unsafety != Unsafety::Normal {
+                let msg = "trait aliases cannot be `unsafe`";
+                self.struct_span_err(self.prev_span, msg)
+                    .span_label(self.prev_span, msg)
+                    .emit();
+            }
+            Ok((ident, ItemKind::TraitAlias(tps, bounds), None))
+        } else {
+            // it's a normal trait
+            tps.where_clause = self.parse_where_clause()?;
+            self.expect(&token::OpenDelim(token::Brace))?;
+            let mut trait_items = vec![];
+            while !self.eat(&token::CloseDelim(token::Brace)) {
+                let mut at_end = false;
+                match self.parse_trait_item(&mut at_end) {
+                    Ok(item) => trait_items.push(item),
+                    Err(mut e) => {
+                        e.emit();
+                        if !at_end {
+                            self.recover_stmt_(SemiColonMode::Break, BlockMode::Break);
+                        }
+                    }
+                }
+            }
+            Ok((ident, ItemKind::Trait(is_auto, unsafety, tps, bounds, trait_items), None))
+        }
+    }
+    fn choose_generics_over_qpath(&self) -> bool {
+        // There's an ambiguity between generic parameters and qualified paths in impls.
+        // If we see `<` it may start both, so we have to inspect some following tokens.
+        // The following combinations can only start generics,
+        // but not qualified paths (with one exception):
+        //     `<` `>` - empty generic parameters
+        //     `<` `#` - generic parameters with attributes
+        //     `<` (LIFETIME|IDENT) `>` - single generic parameter
+        //     `<` (LIFETIME|IDENT) `,` - first generic parameter in a list
+        //     `<` (LIFETIME|IDENT) `:` - generic parameter with bounds
+        //     `<` (LIFETIME|IDENT) `=` - generic parameter with a default
+        //     `<` const                - generic const parameter
+        // The only truly ambiguous case is
+        //     `<` IDENT `>` `::` IDENT ...
+        // we disambiguate it in favor of generics (`impl<T> ::absolute::Path<T> { ... }`)
+        // because this is what almost always expected in practice, qualified paths in impls
+        // (`impl <Type>::AssocTy { ... }`) aren't even allowed by type checker at the moment.
+        self.token == token::Lt &&
+            (self.look_ahead(1, |t| t == &token::Pound || t == &token::Gt) ||
+             self.look_ahead(1, |t| t.is_lifetime() || t.is_ident()) &&
+                self.look_ahead(2, |t| t == &token::Gt || t == &token::Comma ||
+                                       t == &token::Colon || t == &token::Eq) ||
+             self.look_ahead(1, |t| t.is_keyword(keywords::Const)))
+    }
+    fn parse_impl_body(&mut self) -> PResult<'a, (Vec<ImplItem>, Vec<Attribute>)> {
+        self.expect(&token::OpenDelim(token::Brace))?;
+        let attrs = self.parse_inner_attributes()?;
+        let mut impl_items = Vec::new();
+        while !self.eat(&token::CloseDelim(token::Brace)) {
+            let mut at_end = false;
+            match self.parse_impl_item(&mut at_end) {
+                Ok(impl_item) => impl_items.push(impl_item),
+                Err(mut err) => {
+                    err.emit();
+                    if !at_end {
+                        self.recover_stmt_(SemiColonMode::Break, BlockMode::Break);
+                    }
+                }
+            }
+        }
+        Ok((impl_items, attrs))
+    }
+    /// Parses an implementation item, `impl` keyword is already parsed.
+    ///
+    ///    impl<'a, T> TYPE { /* impl items */ }
+    ///    impl<'a, T> TRAIT for TYPE { /* impl items */ }
+    ///    impl<'a, T> !TRAIT for TYPE { /* impl items */ }
+    ///
+    /// We actually parse slightly more relaxed grammar for better error reporting and recovery.
+    ///     `impl` GENERICS `!`? TYPE `for`? (TYPE | `..`) (`where` PREDICATES)? `{` BODY `}`
+    ///     `impl` GENERICS `!`? TYPE (`where` PREDICATES)? `{` BODY `}`
+    fn parse_item_impl(&mut self, unsafety: Unsafety, defaultness: Defaultness)
+                       -> PResult<'a, ItemInfo> {
+        // First, parse generic parameters if necessary.
+        let mut generics = if self.choose_generics_over_qpath() {
+            self.parse_generics()?
+        } else {
+            ast::Generics::default()
+        };
+        // Disambiguate `impl !Trait for Type { ... }` and `impl ! { ... }` for the never type.
+        let polarity = if self.check(&token::Not) && self.look_ahead(1, |t| t.can_begin_type()) {
+            self.bump(); // `!`
+            ast::ImplPolarity::Negative
+        } else {
+            ast::ImplPolarity::Positive
+        };
+        // Parse both types and traits as a type, then reinterpret if necessary.
+        let ty_first = self.parse_ty()?;
+        // If `for` is missing we try to recover.
+        let has_for = self.eat_keyword(keywords::For);
+        let missing_for_span = self.prev_span.between(self.span);
+        let ty_second = if self.token == token::DotDot {
+            // We need to report this error after `cfg` expansion for compatibility reasons
+            self.bump(); // `..`, do not add it to expected tokens
+            Some(P(Ty { node: TyKind::Err, span: self.prev_span, id: ast::DUMMY_NODE_ID }))
+        } else if has_for || self.token.can_begin_type() {
+            Some(self.parse_ty()?)
+        } else {
+            None
+        };
+        generics.where_clause = self.parse_where_clause()?;
+        let (impl_items, attrs) = self.parse_impl_body()?;
+        let item_kind = match ty_second {
+            Some(ty_second) => {
+                // impl Trait for Type
+                if !has_for {
+                    self.struct_span_err(missing_for_span, "missing `for` in a trait impl")
+                        .span_suggestion_short(
+                            missing_for_span,
+                            "add `for` here",
+                            " for ".to_string(),
+                            Applicability::MachineApplicable,
+                        ).emit();
+                }
+                let ty_first = ty_first.into_inner();
+                let path = match ty_first.node {
+                    // This notably includes paths passed through `ty` macro fragments (#46438).
+                    TyKind::Path(None, path) => path,
+                    _ => {
+                        self.span_err(ty_first.span, "expected a trait, found type");
+                        ast::Path::from_ident(Ident::new(keywords::Invalid.name(), ty_first.span))
+                    }
+                };
+                let trait_ref = TraitRef { path, ref_id: ty_first.id };
+                ItemKind::Impl(unsafety, polarity, defaultness,
+                               generics, Some(trait_ref), ty_second, impl_items)
+            }
+            None => {
+                // impl Type
+                ItemKind::Impl(unsafety, polarity, defaultness,
+                               generics, None, ty_first, impl_items)
+            }
+        };
+        Ok((keywords::Invalid.ident(), item_kind, Some(attrs)))
+    }
+    fn parse_late_bound_lifetime_defs(&mut self) -> PResult<'a, Vec<GenericParam>> {
+        if self.eat_keyword(keywords::For) {
+            self.expect_lt()?;
+            let params = self.parse_generic_params()?;
+            self.expect_gt()?;
+            // We rely on AST validation to rule out invalid cases: There must not be type
+            // parameters, and the lifetime parameters must not have bounds.
+            Ok(params)
+        } else {
+            Ok(Vec::new())
+        }
+    }
+    /// Parses `struct Foo { ... }`.
+    fn parse_item_struct(&mut self) -> PResult<'a, ItemInfo> {
+        let class_name = self.parse_ident()?;
+        let mut generics = self.parse_generics()?;
+        // There is a special case worth noting here, as reported in issue #17904.
+        // If we are parsing a tuple struct it is the case that the where clause
+        // should follow the field list. Like so:
+        //
+        // struct Foo<T>(T) where T: Copy;
+        //
+        // If we are parsing a normal record-style struct it is the case
+        // that the where clause comes before the body, and after the generics.
+        // So if we look ahead and see a brace or a where-clause we begin
+        // parsing a record style struct.
+        //
+        // Otherwise if we look ahead and see a paren we parse a tuple-style
+        // struct.
+        let vdata = if self.token.is_keyword(keywords::Where) {
+            generics.where_clause = self.parse_where_clause()?;
+            if self.eat(&token::Semi) {
+                // If we see a: `struct Foo<T> where T: Copy;` style decl.
+                VariantData::Unit(ast::DUMMY_NODE_ID)
+            } else {
+                // If we see: `struct Foo<T> where T: Copy { ... }`
+                VariantData::Struct(self.parse_record_struct_body()?, ast::DUMMY_NODE_ID)
+            }
+        // No `where` so: `struct Foo<T>;`
+        } else if self.eat(&token::Semi) {
+            VariantData::Unit(ast::DUMMY_NODE_ID)
+        // Record-style struct definition
+        } else if self.token == token::OpenDelim(token::Brace) {
+            VariantData::Struct(self.parse_record_struct_body()?, ast::DUMMY_NODE_ID)
+        // Tuple-style struct definition with optional where-clause.
+        } else if self.token == token::OpenDelim(token::Paren) {
+            let body = VariantData::Tuple(self.parse_tuple_struct_body()?, ast::DUMMY_NODE_ID);
+            generics.where_clause = self.parse_where_clause()?;
+            self.expect(&token::Semi)?;
+            body
+        } else {
+            let token_str = self.this_token_descr();
+            let mut err = self.fatal(&format!(
+                "expected `where`, `{{`, `(`, or `;` after struct name, found {}",
+                token_str
+            ));
+            err.span_label(self.span, "expected `where`, `{`, `(`, or `;` after struct name");
+            return Err(err);
+        };
+        Ok((class_name, ItemKind::Struct(vdata, generics), None))
+    }
+    /// Parses `union Foo { ... }`.
+    fn parse_item_union(&mut self) -> PResult<'a, ItemInfo> {
+        let class_name = self.parse_ident()?;
+        let mut generics = self.parse_generics()?;
+        let vdata = if self.token.is_keyword(keywords::Where) {
+            generics.where_clause = self.parse_where_clause()?;
+            VariantData::Struct(self.parse_record_struct_body()?, ast::DUMMY_NODE_ID)
+        } else if self.token == token::OpenDelim(token::Brace) {
+            VariantData::Struct(self.parse_record_struct_body()?, ast::DUMMY_NODE_ID)
+        } else {
+            let token_str = self.this_token_descr();
+            let mut err = self.fatal(&format!(
+                "expected `where` or `{{` after union name, found {}", token_str));
+            err.span_label(self.span, "expected `where` or `{` after union name");
+            return Err(err);
+        };
+        Ok((class_name, ItemKind::Union(vdata, generics), None))
+    }
+    fn consume_block(&mut self, delim: token::DelimToken) {
+        let mut brace_depth = 0;
+        loop {
+            if self.eat(&token::OpenDelim(delim)) {
+                brace_depth += 1;
+            } else if self.eat(&token::CloseDelim(delim)) {
+                if brace_depth == 0 {
+                    return;
+                } else {
+                    brace_depth -= 1;
+                    continue;
+                }
+            } else if self.token == token::Eof || self.eat(&token::CloseDelim(token::NoDelim)) {
+                return;
+            } else {
+                self.bump();
+            }
+        }
+    }
+    fn parse_record_struct_body(&mut self) -> PResult<'a, Vec<StructField>> {
+        let mut fields = Vec::new();
+        if self.eat(&token::OpenDelim(token::Brace)) {
+            while self.token != token::CloseDelim(token::Brace) {
+                let field = self.parse_struct_decl_field().map_err(|e| {
+                    self.recover_stmt();
+                    e
+                });
+                match field {
+                    Ok(field) => fields.push(field),
+                    Err(mut err) => {
+                        err.emit();
+                    }
+                }
+            }
+            self.eat(&token::CloseDelim(token::Brace));
+        } else {
+            let token_str = self.this_token_descr();
+            let mut err = self.fatal(&format!(
+                    "expected `where`, or `{{` after struct name, found {}", token_str));
+            err.span_label(self.span, "expected `where`, or `{` after struct name");
+            return Err(err);
+        }
+        Ok(fields)
+    }
+    fn parse_tuple_struct_body(&mut self) -> PResult<'a, Vec<StructField>> {
+        // This is the case where we find `struct Foo<T>(T) where T: Copy;`
+        // Unit like structs are handled in parse_item_struct function
+        let fields = self.parse_unspanned_seq(
+            &token::OpenDelim(token::Paren),
+            &token::CloseDelim(token::Paren),
+            SeqSep::trailing_allowed(token::Comma),
+            |p| {
+                let attrs = p.parse_outer_attributes()?;
+                let lo = p.span;
+                let vis = p.parse_visibility(true)?;
+                let ty = p.parse_ty()?;
+                Ok(StructField {
+                    span: lo.to(ty.span),
+                    vis,
+                    ident: None,
+                    id: ast::DUMMY_NODE_ID,
+                    ty,
+                    attrs,
+                })
+            })?;
+        Ok(fields)
+    }
+    /// Parses a structure field declaration.
+    fn parse_single_struct_field(&mut self,
+                                     lo: Span,
+                                     vis: Visibility,
+                                     attrs: Vec<Attribute> )
+                                     -> PResult<'a, StructField> {
+        let mut seen_comma: bool = false;
+        let a_var = self.parse_name_and_ty(lo, vis, attrs)?;
+        if self.token == token::Comma {
+            seen_comma = true;
+        }
+        match self.token {
+            token::Comma => {
+                self.bump();
+            }
+            token::CloseDelim(token::Brace) => {}
+            token::DocComment(_) => {
+                let previous_span = self.prev_span;
+                let mut err = self.span_fatal_err(self.span, Error::UselessDocComment);
+                self.bump(); // consume the doc comment
+                let comma_after_doc_seen = self.eat(&token::Comma);
+                // `seen_comma` is always false, because we are inside doc block
+                // condition is here to make code more readable
+                if seen_comma == false && comma_after_doc_seen == true {
+                    seen_comma = true;
+                }
+                if comma_after_doc_seen || self.token == token::CloseDelim(token::Brace) {
+                    err.emit();
+                } else {
+                    if seen_comma == false {
+                        let sp = self.sess.source_map().next_point(previous_span);
+                        err.span_suggestion(
+                            sp,
+                            "missing comma here",
+                            ",".into(),
+                            Applicability::MachineApplicable
+                        );
+                    }
+                    return Err(err);
+                }
+            }
+            _ => {
+                let sp = self.sess.source_map().next_point(self.prev_span);
+                let mut err = self.struct_span_err(sp, &format!("expected `,`, or `}}`, found {}",
+                                                                self.this_token_descr()));
+                if self.token.is_ident() {
+                    // This is likely another field; emit the diagnostic and keep going
+                    err.span_suggestion(
+                        sp,
+                        "try adding a comma",
+                        ",".into(),
+                        Applicability::MachineApplicable,
+                    );
+                    err.emit();
+                } else {
+                    return Err(err)
+                }
+            }
+        }
+        Ok(a_var)
+    }
+    /// Parses an element of a struct declaration.
+    fn parse_struct_decl_field(&mut self) -> PResult<'a, StructField> {
+        let attrs = self.parse_outer_attributes()?;
+        let lo = self.span;
+        let vis = self.parse_visibility(false)?;
+        self.parse_single_struct_field(lo, vis, attrs)
+    }
+    /// Parses `pub`, `pub(crate)` and `pub(in path)` plus shortcuts `crate` for `pub(crate)`,
+    /// `pub(self)` for `pub(in self)` and `pub(super)` for `pub(in super)`.
+    /// If the following element can't be a tuple (i.e., it's a function definition), then
+    /// it's not a tuple struct field), and the contents within the parentheses isn't valid,
+    /// so emit a proper diagnostic.
+    pub fn parse_visibility(&mut self, can_take_tuple: bool) -> PResult<'a, Visibility> {
+        maybe_whole!(self, NtVis, |x| x);
+        self.expected_tokens.push(TokenType::Keyword(keywords::Crate));
+        if self.is_crate_vis() {
+            self.bump(); // `crate`
+            return Ok(respan(self.prev_span, VisibilityKind::Crate(CrateSugar::JustCrate)));
+        }
+        if !self.eat_keyword(keywords::Pub) {
+            // We need a span for our `Spanned<VisibilityKind>`, but there's inherently no
+            // keyword to grab a span from for inherited visibility; an empty span at the
+            // beginning of the current token would seem to be the "Schelling span".
+            return Ok(respan(self.span.shrink_to_lo(), VisibilityKind::Inherited))
+        }
+        let lo = self.prev_span;
+        if self.check(&token::OpenDelim(token::Paren)) {
+            // We don't `self.bump()` the `(` yet because this might be a struct definition where
+            // `()` or a tuple might be allowed. For example, `struct Struct(pub (), pub (usize));`.
+            // Because of this, we only `bump` the `(` if we're assured it is appropriate to do so
+            // by the following tokens.
+            if self.look_ahead(1, |t| t.is_keyword(keywords::Crate)) {
+                // `pub(crate)`
+                self.bump(); // `(`
+                self.bump(); // `crate`
+                self.expect(&token::CloseDelim(token::Paren))?; // `)`
+                let vis = respan(
+                    lo.to(self.prev_span),
+                    VisibilityKind::Crate(CrateSugar::PubCrate),
+                );
+                return Ok(vis)
+            } else if self.look_ahead(1, |t| t.is_keyword(keywords::In)) {
+                // `pub(in path)`
+                self.bump(); // `(`
+                self.bump(); // `in`
+                let path = self.parse_path(PathStyle::Mod)?; // `path`
+                self.expect(&token::CloseDelim(token::Paren))?; // `)`
+                let vis = respan(lo.to(self.prev_span), VisibilityKind::Restricted {
+                    path: P(path),
+                    id: ast::DUMMY_NODE_ID,
+                });
+                return Ok(vis)
+            } else if self.look_ahead(2, |t| t == &token::CloseDelim(token::Paren)) &&
+                      self.look_ahead(1, |t| t.is_keyword(keywords::Super) ||
+                                             t.is_keyword(keywords::SelfLower))
+            {
+                // `pub(self)` or `pub(super)`
+                self.bump(); // `(`
+                let path = self.parse_path(PathStyle::Mod)?; // `super`/`self`
+                self.expect(&token::CloseDelim(token::Paren))?; // `)`
+                let vis = respan(lo.to(self.prev_span), VisibilityKind::Restricted {
+                    path: P(path),
+                    id: ast::DUMMY_NODE_ID,
+                });
+                return Ok(vis)
+            } else if !can_take_tuple {  // Provide this diagnostic if this is not a tuple struct
+                // `pub(something) fn ...` or `struct X { pub(something) y: Z }`
+                self.bump(); // `(`
+                let msg = "incorrect visibility restriction";
+                let suggestion = r##"some possible visibility restrictions are:
+`pub(crate)`: visible only on the current crate
+`pub(super)`: visible only in the current module's parent
+`pub(in path::to::module)`: visible only on the specified path"##;
+                let path = self.parse_path(PathStyle::Mod)?;
+                let sp = self.prev_span;
+                let help_msg = format!("make this visible only to module `{}` with `in`", path);
+                self.expect(&token::CloseDelim(token::Paren))?;  // `)`
+                let mut err = struct_span_err!(self.sess.span_diagnostic, sp, E0704, "{}", msg);
+                err.help(suggestion);
+                err.span_suggestion(
+                    sp, &help_msg, format!("in {}", path), Applicability::MachineApplicable
+                );
+                err.emit();  // emit diagnostic, but continue with public visibility
+            }
+        }
+        Ok(respan(lo, VisibilityKind::Public))
+    }
+    /// Parses defaultness (i.e., `default` or nothing).
+    fn parse_defaultness(&mut self) -> Defaultness {
+        // `pub` is included for better error messages
+        if self.check_keyword(keywords::Default) &&
+           self.look_ahead(1, |t| t.is_keyword(keywords::Impl) ||
+                                  t.is_keyword(keywords::Const) ||
+                                  t.is_keyword(keywords::Fn) ||
+                                  t.is_keyword(keywords::Unsafe) ||
+                                  t.is_keyword(keywords::Extern) ||
+                                  t.is_keyword(keywords::Type) ||
+                                  t.is_keyword(keywords::Pub)) {
+            self.bump(); // `default`
+            Defaultness::Default
+        } else {
+            Defaultness::Final
+        }
+    }
+    fn maybe_consume_incorrect_semicolon(&mut self, items: &[P<Item>]) -> bool {
+        if self.eat(&token::Semi) {
+            let mut err = self.struct_span_err(self.prev_span, "expected item, found `;`");
+            err.span_suggestion_short(
+                self.prev_span,
+                "remove this semicolon",
+                String::new(),
+                Applicability::MachineApplicable,
+            );
+            if !items.is_empty() {
+                let previous_item = &items[items.len()-1];
+                let previous_item_kind_name = match previous_item.node {
+                    // say "braced struct" because tuple-structs and
+                    // braceless-empty-struct declarations do take a semicolon
+                    ItemKind::Struct(..) => Some("braced struct"),
+                    ItemKind::Enum(..) => Some("enum"),
+                    ItemKind::Trait(..) => Some("trait"),
+                    ItemKind::Union(..) => Some("union"),
+                    _ => None,
+                };
+                if let Some(name) = previous_item_kind_name {
+                    err.help(&format!("{} declarations are not followed by a semicolon", name));
+                }
+            }
+            err.emit();
+            true
+        } else {
+            false
+        }
+    }
+    /// Given a termination token, parses all of the items in a module.
+    fn parse_mod_items(&mut self, term: &token::Token, inner_lo: Span) -> PResult<'a, Mod> {
+        let mut items = vec![];
+        while let Some(item) = self.parse_item()? {
+            items.push(item);
+            self.maybe_consume_incorrect_semicolon(&items);
+        }
+        if !self.eat(term) {
+            let token_str = self.this_token_descr();
+            if !self.maybe_consume_incorrect_semicolon(&items) {
+                let mut err = self.fatal(&format!("expected item, found {}", token_str));
+                err.span_label(self.span, "expected item");
+                return Err(err);
+            }
+        }
+        let hi = if self.span.is_dummy() {
+            inner_lo
+        } else {
+            self.prev_span
+        };
+        Ok(ast::Mod {
+            inner: inner_lo.to(hi),
+            items,
+            inline: true
+        })
+    }
+    fn parse_item_const(&mut self, m: Option<Mutability>) -> PResult<'a, ItemInfo> {
+        let id = if m.is_none() { self.parse_ident_or_underscore() } else { self.parse_ident() }?;
+        self.expect(&token::Colon)?;
+        let ty = self.parse_ty()?;
+        self.expect(&token::Eq)?;
+        let e = self.parse_expr()?;
+        self.expect(&token::Semi)?;
+        let item = match m {
+            Some(m) => ItemKind::Static(ty, m, e),
+            None => ItemKind::Const(ty, e),
+        };
+        Ok((id, item, None))
+    }
+    /// Parse a `mod <foo> { ... }` or `mod <foo>;` item
+    fn parse_item_mod(&mut self, outer_attrs: &[Attribute]) -> PResult<'a, ItemInfo> {
+        let (in_cfg, outer_attrs) = {
+            let mut strip_unconfigured = crate::config::StripUnconfigured {
+                sess: self.sess,
+                features: None, // don't perform gated feature checking
+            };
+            let mut outer_attrs = outer_attrs.to_owned();
+            strip_unconfigured.process_cfg_attrs(&mut outer_attrs);
+            (!self.cfg_mods || strip_unconfigured.in_cfg(&outer_attrs), outer_attrs)
+        };
+        let id_span = self.span;
+        let id = self.parse_ident()?;
+        if self.eat(&token::Semi) {
+            if in_cfg && self.recurse_into_file_modules {
+                // This mod is in an external file. Let's go get it!
+                let ModulePathSuccess { path, directory_ownership, warn } =
+                    self.submod_path(id, &outer_attrs, id_span)?;
+                let (module, mut attrs) =
+                    self.eval_src_mod(path, directory_ownership, id.to_string(), id_span)?;
+                // Record that we fetched the mod from an external file
+                if warn {
+                    let attr = Attribute {
+                        id: attr::mk_attr_id(),
+                        style: ast::AttrStyle::Outer,
+                        path: ast::Path::from_ident(Ident::from_str("warn_directory_ownership")),
+                        tokens: TokenStream::empty(),
+                        is_sugared_doc: false,
+                        span: syntax_pos::DUMMY_SP,
+                    };
+                    attr::mark_known(&attr);
+                    attrs.push(attr);
+                }
+                Ok((id, ItemKind::Mod(module), Some(attrs)))
+            } else {
+                let placeholder = ast::Mod {
+                    inner: syntax_pos::DUMMY_SP,
+                    items: Vec::new(),
+                    inline: false
+                };
+                Ok((id, ItemKind::Mod(placeholder), None))
+            }
+        } else {
+            let old_directory = self.directory.clone();
+            self.push_directory(id, &outer_attrs);
+            self.expect(&token::OpenDelim(token::Brace))?;
+            let mod_inner_lo = self.span;
+            let attrs = self.parse_inner_attributes()?;
+            let module = self.parse_mod_items(&token::CloseDelim(token::Brace), mod_inner_lo)?;
+            self.directory = old_directory;
+            Ok((id, ItemKind::Mod(module), Some(attrs)))
+        }
+    }
+    fn push_directory(&mut self, id: Ident, attrs: &[Attribute]) {
+        if let Some(path) = attr::first_attr_value_str_by_name(attrs, "path") {
+            self.directory.path.to_mut().push(&path.as_str());
+            self.directory.ownership = DirectoryOwnership::Owned { relative: None };
+        } else {
+            // We have to push on the current module name in the case of relative
+            // paths in order to ensure that any additional module paths from inline
+            // `mod x { ... }` come after the relative extension.
+            //
+            // For example, a `mod z { ... }` inside `x/y.rs` should set the current
+            // directory path to `/x/y/z`, not `/x/z` with a relative offset of `y`.
+            if let DirectoryOwnership::Owned { relative } = &mut self.directory.ownership {
+                if let Some(ident) = relative.take() { // remove the relative offset
+                    self.directory.path.to_mut().push(ident.as_str());
+                }
+            }
+            self.directory.path.to_mut().push(&id.as_str());
+        }
+    }
+    pub fn submod_path_from_attr(attrs: &[Attribute], dir_path: &Path) -> Option<PathBuf> {
+        if let Some(s) = attr::first_attr_value_str_by_name(attrs, "path") {
+            let s = s.as_str();
+            // On windows, the base path might have the form
+            // `\\?\foo\bar` in which case it does not tolerate
+            // mixed `/` and `\` separators, so canonicalize
+            // `/` to `\`.
+            #[cfg(windows)]
+            let s = s.replace("/", "\\");
+            Some(dir_path.join(s))
+        } else {
+            None
+        }
+    }
+    /// Returns a path to a module.
+    pub fn default_submod_path(
+        id: ast::Ident,
+        relative: Option<ast::Ident>,
+        dir_path: &Path,
+        source_map: &SourceMap) -> ModulePath
+    {
+        // If we're in a foo.rs file instead of a mod.rs file,
+        // we need to look for submodules in
+        // `./foo/<id>.rs` and `./foo/<id>/mod.rs` rather than
+        // `./<id>.rs` and `./<id>/mod.rs`.
+        let relative_prefix_string;
+        let relative_prefix = if let Some(ident) = relative {
+            relative_prefix_string = format!("{}{}", ident.as_str(), path::MAIN_SEPARATOR);
+            &relative_prefix_string
+        } else {
+            ""
+        };
+        let mod_name = id.to_string();
+        let default_path_str = format!("{}{}.rs", relative_prefix, mod_name);
+        let secondary_path_str = format!("{}{}{}mod.rs",
+                                         relative_prefix, mod_name, path::MAIN_SEPARATOR);
+        let default_path = dir_path.join(&default_path_str);
+        let secondary_path = dir_path.join(&secondary_path_str);
+        let default_exists = source_map.file_exists(&default_path);
+        let secondary_exists = source_map.file_exists(&secondary_path);
+        let result = match (default_exists, secondary_exists) {
+            (true, false) => Ok(ModulePathSuccess {
+                path: default_path,
+                directory_ownership: DirectoryOwnership::Owned {
+                    relative: Some(id),
+                },
+                warn: false,
+            }),
+            (false, true) => Ok(ModulePathSuccess {
+                path: secondary_path,
+                directory_ownership: DirectoryOwnership::Owned {
+                    relative: None,
+                },
+                warn: false,
+            }),
+            (false, false) => Err(Error::FileNotFoundForModule {
+                mod_name: mod_name.clone(),
+                default_path: default_path_str,
+                secondary_path: secondary_path_str,
+                dir_path: dir_path.display().to_string(),
+            }),
+            (true, true) => Err(Error::DuplicatePaths {
+                mod_name: mod_name.clone(),
+                default_path: default_path_str,
+                secondary_path: secondary_path_str,
+            }),
+        };
+        ModulePath {
+            name: mod_name,
+            path_exists: default_exists || secondary_exists,
+            result,
+        }
+    }
+    fn submod_path(&mut self,
+                   id: ast::Ident,
+                   outer_attrs: &[Attribute],
+                   id_sp: Span)
+                   -> PResult<'a, ModulePathSuccess> {
+        if let Some(path) = Parser::submod_path_from_attr(outer_attrs, &self.directory.path) {
+            return Ok(ModulePathSuccess {
+                directory_ownership: match path.file_name().and_then(|s| s.to_str()) {
+                    // All `#[path]` files are treated as though they are a `mod.rs` file.
+                    // This means that `mod foo;` declarations inside `#[path]`-included
+                    // files are siblings,
+                    //
+                    // Note that this will produce weirdness when a file named `foo.rs` is
+                    // `#[path]` included and contains a `mod foo;` declaration.
+                    // If you encounter this, it's your own darn fault :P
+                    Some(_) => DirectoryOwnership::Owned { relative: None },
+                    _ => DirectoryOwnership::UnownedViaMod(true),
+                },
+                path,
+                warn: false,
+            });
+        }
+        let relative = match self.directory.ownership {
+            DirectoryOwnership::Owned { relative } => relative,
+            DirectoryOwnership::UnownedViaBlock |
+            DirectoryOwnership::UnownedViaMod(_) => None,
+        };
+        let paths = Parser::default_submod_path(
+                        id, relative, &self.directory.path, self.sess.source_map());
+        match self.directory.ownership {
+            DirectoryOwnership::Owned { .. } => {
+                paths.result.map_err(|err| self.span_fatal_err(id_sp, err))
+            },
+            DirectoryOwnership::UnownedViaBlock => {
+                let msg =
+                    "Cannot declare a non-inline module inside a block \
+                    unless it has a path attribute";
+                let mut err = self.diagnostic().struct_span_err(id_sp, msg);
+                if paths.path_exists {
+                    let msg = format!("Maybe `use` the module `{}` instead of redeclaring it",
+                                      paths.name);
+                    err.span_note(id_sp, &msg);
+                }
+                Err(err)
+            }
+            DirectoryOwnership::UnownedViaMod(warn) => {
+                if warn {
+                    if let Ok(result) = paths.result {
+                        return Ok(ModulePathSuccess { warn: true, ..result });
+                    }
+                }
+                let mut err = self.diagnostic().struct_span_err(id_sp,
+                    "cannot declare a new module at this location");
+                if !id_sp.is_dummy() {
+                    let src_path = self.sess.source_map().span_to_filename(id_sp);
+                    if let FileName::Real(src_path) = src_path {
+                        if let Some(stem) = src_path.file_stem() {
+                            let mut dest_path = src_path.clone();
+                            dest_path.set_file_name(stem);
+                            dest_path.push("mod.rs");
+                            err.span_note(id_sp,
+                                    &format!("maybe move this module `{}` to its own \
+                                                directory via `{}`", src_path.display(),
+                                            dest_path.display()));
+                        }
+                    }
+                }
+                if paths.path_exists {
+                    err.span_note(id_sp,
+                                  &format!("... or maybe `use` the module `{}` instead \
+                                            of possibly redeclaring it",
+                                           paths.name));
+                }
+                Err(err)
+            }
+        }
+    }
+    /// Reads a module from a source file.
+    fn eval_src_mod(&mut self,
+                    path: PathBuf,
+                    directory_ownership: DirectoryOwnership,
+                    name: String,
+                    id_sp: Span)
+                    -> PResult<'a, (ast::Mod, Vec<Attribute> )> {
+        let mut included_mod_stack = self.sess.included_mod_stack.borrow_mut();
+        if let Some(i) = included_mod_stack.iter().position(|p| *p == path) {
+            let mut err = String::from("circular modules: ");
+            let len = included_mod_stack.len();
+            for p in &included_mod_stack[i.. len] {
+                err.push_str(&p.to_string_lossy());
+                err.push_str(" -> ");
+            }
+            err.push_str(&path.to_string_lossy());
+            return Err(self.span_fatal(id_sp, &err[..]));
+        }
+        included_mod_stack.push(path.clone());
+        drop(included_mod_stack);
+        let mut p0 =
+            new_sub_parser_from_file(self.sess, &path, directory_ownership, Some(name), id_sp);
+        p0.cfg_mods = self.cfg_mods;
+        let mod_inner_lo = p0.span;
+        let mod_attrs = p0.parse_inner_attributes()?;
+        let mut m0 = p0.parse_mod_items(&token::Eof, mod_inner_lo)?;
+        m0.inline = false;
+        self.sess.included_mod_stack.borrow_mut().pop();
+        Ok((m0, mod_attrs))
+    }
+    /// Parses a function declaration from a foreign module.
+    fn parse_item_foreign_fn(&mut self, vis: ast::Visibility, lo: Span, attrs: Vec<Attribute>)
+                             -> PResult<'a, ForeignItem> {
+        self.expect_keyword(keywords::Fn)?;
+        let (ident, mut generics) = self.parse_fn_header()?;
+        let decl = self.parse_fn_decl(true)?;
+        generics.where_clause = self.parse_where_clause()?;
+        let hi = self.span;
+        self.expect(&token::Semi)?;
+        Ok(ast::ForeignItem {
+            ident,
+            attrs,
+            node: ForeignItemKind::Fn(decl, generics),
+            id: ast::DUMMY_NODE_ID,
+            span: lo.to(hi),
+            vis,
+        })
+    }
+    /// Parses a static item from a foreign module.
+    /// Assumes that the `static` keyword is already parsed.
+    fn parse_item_foreign_static(&mut self, vis: ast::Visibility, lo: Span, attrs: Vec<Attribute>)
+                                 -> PResult<'a, ForeignItem> {
+        let mutbl = self.eat_keyword(keywords::Mut);
+        let ident = self.parse_ident()?;
+        self.expect(&token::Colon)?;
+        let ty = self.parse_ty()?;
+        let hi = self.span;
+        self.expect(&token::Semi)?;
+        Ok(ForeignItem {
+            ident,
+            attrs,
+            node: ForeignItemKind::Static(ty, mutbl),
+            id: ast::DUMMY_NODE_ID,
+            span: lo.to(hi),
+            vis,
+        })
+    }
+    /// Parses a type from a foreign module.
+    fn parse_item_foreign_type(&mut self, vis: ast::Visibility, lo: Span, attrs: Vec<Attribute>)
+                             -> PResult<'a, ForeignItem> {
+        self.expect_keyword(keywords::Type)?;
+        let ident = self.parse_ident()?;
+        let hi = self.span;
+        self.expect(&token::Semi)?;
+        Ok(ast::ForeignItem {
+            ident: ident,
+            attrs: attrs,
+            node: ForeignItemKind::Ty,
+            id: ast::DUMMY_NODE_ID,
+            span: lo.to(hi),
+            vis: vis
+        })
+    }
+    fn parse_crate_name_with_dashes(&mut self) -> PResult<'a, ast::Ident> {
+        let error_msg = "crate name using dashes are not valid in `extern crate` statements";
+        let suggestion_msg = "if the original crate name uses dashes you need to use underscores \
+                              in the code";
+        let mut ident = if self.token.is_keyword(keywords::SelfLower) {
+            self.parse_path_segment_ident()
+        } else {
+            self.parse_ident()
+        }?;
+        let mut idents = vec![];
+        let mut replacement = vec![];
+        let mut fixed_crate_name = false;
+        // Accept `extern crate name-like-this` for better diagnostics
+        let dash = token::Token::BinOp(token::BinOpToken::Minus);
+        if self.token == dash {  // Do not include `-` as part of the expected tokens list
+            while self.eat(&dash) {
+                fixed_crate_name = true;
+                replacement.push((self.prev_span, "_".to_string()));
+                idents.push(self.parse_ident()?);
+            }
+        }
+        if fixed_crate_name {
+            let fixed_name_sp = ident.span.to(idents.last().unwrap().span);
+            let mut fixed_name = format!("{}", ident.name);
+            for part in idents {
+                fixed_name.push_str(&format!("_{}", part.name));
+            }
+            ident = Ident::from_str(&fixed_name).with_span_pos(fixed_name_sp);
+            let mut err = self.struct_span_err(fixed_name_sp, error_msg);
+            err.span_label(fixed_name_sp, "dash-separated idents are not valid");
+            err.multipart_suggestion(
+                suggestion_msg,
+                replacement,
+                Applicability::MachineApplicable,
+            );
+            err.emit();
+        }
+        Ok(ident)
+    }
+    /// Parses `extern crate` links.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// extern crate foo;
+    /// extern crate bar as foo;
+    /// ```
+    fn parse_item_extern_crate(&mut self,
+                               lo: Span,
+                               visibility: Visibility,
+                               attrs: Vec<Attribute>)
+                               -> PResult<'a, P<Item>> {
+        // Accept `extern crate name-like-this` for better diagnostics
+        let orig_name = self.parse_crate_name_with_dashes()?;
+        let (item_name, orig_name) = if let Some(rename) = self.parse_rename()? {
+            (rename, Some(orig_name.name))
+        } else {
+            (orig_name, None)
+        };
+        self.expect(&token::Semi)?;
+        let span = lo.to(self.prev_span);
+        Ok(self.mk_item(span, item_name, ItemKind::ExternCrate(orig_name), visibility, attrs))
+    }
+    /// Parses `extern` for foreign ABIs modules.
+    ///
+    /// `extern` is expected to have been
+    /// consumed before calling this method.
+    ///
+    /// # Examples
+    ///
+    /// ```ignore (only-for-syntax-highlight)
+    /// extern "C" {}
+    /// extern {}
+    /// ```
+    fn parse_item_foreign_mod(&mut self,
+                              lo: Span,
+                              opt_abi: Option<Abi>,
+                              visibility: Visibility,
+                              mut attrs: Vec<Attribute>)
+                              -> PResult<'a, P<Item>> {
+        self.expect(&token::OpenDelim(token::Brace))?;
+        let abi = opt_abi.unwrap_or(Abi::C);
+        attrs.extend(self.parse_inner_attributes()?);
+        let mut foreign_items = vec![];
+        while !self.eat(&token::CloseDelim(token::Brace)) {
+            foreign_items.push(self.parse_foreign_item()?);
+        }
+        let prev_span = self.prev_span;
+        let m = ast::ForeignMod {
+            abi,
+            items: foreign_items
+        };
+        let invalid = keywords::Invalid.ident();
+        Ok(self.mk_item(lo.to(prev_span), invalid, ItemKind::ForeignMod(m), visibility, attrs))
+    }
+    /// Parses `type Foo = Bar;`
+    /// or
+    /// `existential type Foo: Bar;`
+    /// or
+    /// `return `None``
+    /// without modifying the parser state.
+    fn eat_type(&mut self) -> Option<PResult<'a, (Ident, AliasKind, ast::Generics)>> {
+        // This parses the grammar:
+        //     Ident ["<"...">"] ["where" ...] ("=" | ":") Ty ";"
+        if self.check_keyword(keywords::Type) ||
+           self.check_keyword(keywords::Existential) &&
+                self.look_ahead(1, |t| t.is_keyword(keywords::Type)) {
+            let existential = self.eat_keyword(keywords::Existential);
+            assert!(self.eat_keyword(keywords::Type));
+            Some(self.parse_existential_or_alias(existential))
+        } else {
+            None
+        }
+    }
+    /// Parses a type alias or existential type.
+    fn parse_existential_or_alias(
+        &mut self,
+        existential: bool,
+    ) -> PResult<'a, (Ident, AliasKind, ast::Generics)> {
+        let ident = self.parse_ident()?;
+        let mut tps = self.parse_generics()?;
+        tps.where_clause = self.parse_where_clause()?;
+        let alias = if existential {
+            self.expect(&token::Colon)?;
+            let bounds = self.parse_generic_bounds(None)?;
+            AliasKind::Existential(bounds)
+        } else {
+            self.expect(&token::Eq)?;
+            let ty = self.parse_ty()?;
+            AliasKind::Weak(ty)
+        };
+        self.expect(&token::Semi)?;
+        Ok((ident, alias, tps))
+    }
+    /// Parses the part of an enum declaration following the `{`.
+    fn parse_enum_def(&mut self, _generics: &ast::Generics) -> PResult<'a, EnumDef> {
+        let mut variants = Vec::new();
+        let mut all_nullary = true;
+        let mut any_disr = vec![];
+        while self.token != token::CloseDelim(token::Brace) {
+            let variant_attrs = self.parse_outer_attributes()?;
+            let vlo = self.span;
+            let struct_def;
+            let mut disr_expr = None;
+            let ident = self.parse_ident()?;
+            if self.check(&token::OpenDelim(token::Brace)) {
+                // Parse a struct variant.
+                all_nullary = false;
+                struct_def = VariantData::Struct(self.parse_record_struct_body()?,
+                                                 ast::DUMMY_NODE_ID);
+            } else if self.check(&token::OpenDelim(token::Paren)) {
+                all_nullary = false;
+                struct_def = VariantData::Tuple(self.parse_tuple_struct_body()?,
+                                                ast::DUMMY_NODE_ID);
+            } else if self.eat(&token::Eq) {
+                disr_expr = Some(AnonConst {
+                    id: ast::DUMMY_NODE_ID,
+                    value: self.parse_expr()?,
+                });
+                if let Some(sp) = disr_expr.as_ref().map(|c| c.value.span) {
+                    any_disr.push(sp);
+                }
+                struct_def = VariantData::Unit(ast::DUMMY_NODE_ID);
+            } else {
+                struct_def = VariantData::Unit(ast::DUMMY_NODE_ID);
+            }
+            let vr = ast::Variant_ {
+                ident,
+                attrs: variant_attrs,
+                data: struct_def,
+                disr_expr,
+            };
+            variants.push(respan(vlo.to(self.prev_span), vr));
+            if !self.eat(&token::Comma) { break; }
+        }
+        self.expect(&token::CloseDelim(token::Brace))?;
+        if !any_disr.is_empty() && !all_nullary {
+            let mut err =self.struct_span_err(
+                any_disr.clone(),
+                "discriminator values can only be used with a field-less enum",
+            );
+            for sp in any_disr {
+                err.span_label(sp, "only valid in field-less enums");
+            }
+            err.emit();
+        }
+        Ok(ast::EnumDef { variants })
+    }
+    /// Parses an enum declaration.
+    fn parse_item_enum(&mut self) -> PResult<'a, ItemInfo> {
+        let id = self.parse_ident()?;
+        let mut generics = self.parse_generics()?;
+        generics.where_clause = self.parse_where_clause()?;
+        self.expect(&token::OpenDelim(token::Brace))?;
+        let enum_definition = self.parse_enum_def(&generics).map_err(|e| {
+            self.recover_stmt();
+            self.eat(&token::CloseDelim(token::Brace));
+            e
+        })?;
+        Ok((id, ItemKind::Enum(enum_definition, generics), None))
+    }
+    /// Parses a string as an ABI spec on an extern type or module. Consumes
+    /// the `extern` keyword, if one is found.
+    fn parse_opt_abi(&mut self) -> PResult<'a, Option<Abi>> {
+        match self.token {
+            token::Literal(token::Str_(s), suf) | token::Literal(token::StrRaw(s, _), suf) => {
+                let sp = self.span;
+                self.expect_no_suffix(sp, "ABI spec", suf);
+                self.bump();
+                match abi::lookup(&s.as_str()) {
+                    Some(abi) => Ok(Some(abi)),
+                    None => {
+                        let prev_span = self.prev_span;
+                        let mut err = struct_span_err!(
+                            self.sess.span_diagnostic,
+                            prev_span,
+                            E0703,
+                            "invalid ABI: found `{}`",
+                            s);
+                        err.span_label(prev_span, "invalid ABI");
+                        err.help(&format!("valid ABIs: {}", abi::all_names().join(", ")));
+                        err.emit();
+                        Ok(None)
+                    }
+                }
+            }
+            _ => Ok(None),
+        }
+    }
+    fn is_static_global(&mut self) -> bool {
+        if self.check_keyword(keywords::Static) {
+            // Check if this could be a closure
+            !self.look_ahead(1, |token| {
+                if token.is_keyword(keywords::Move) {
+                    return true;
+                }
+                match *token {
+                    token::BinOp(token::Or) | token::OrOr => true,
+                    _ => false,
+                }
+            })
+        } else {
+            false
+        }
+    }
+    fn parse_item_(
+        &mut self,
+        attrs: Vec<Attribute>,
+        macros_allowed: bool,
+        attributes_allowed: bool,
+    ) -> PResult<'a, Option<P<Item>>> {
+        let (ret, tokens) = self.collect_tokens(|this| {
+            this.parse_item_implementation(attrs, macros_allowed, attributes_allowed)
+        })?;
+        // Once we've parsed an item and recorded the tokens we got while
+        // parsing we may want to store `tokens` into the item we're about to
+        // return. Note, though, that we specifically didn't capture tokens
+        // related to outer attributes. The `tokens` field here may later be
+        // used with procedural macros to convert this item back into a token
+        // stream, but during expansion we may be removing attributes as we go
+        // along.
+        //
+        // If we've got inner attributes then the `tokens` we've got above holds
+        // these inner attributes. If an inner attribute is expanded we won't
+        // actually remove it from the token stream, so we'll just keep yielding
+        // it (bad!). To work around this case for now we just avoid recording
+        // `tokens` if we detect any inner attributes. This should help keep
+        // expansion correct, but we should fix this bug one day!
+        Ok(ret.map(|item| {
+            item.map(|mut i| {
+                if !i.attrs.iter().any(|attr| attr.style == AttrStyle::Inner) {
+                    i.tokens = Some(tokens);
+                }
+                i
+            })
+        }))
+    }
+    /// Parses one of the items allowed by the flags.
+    fn parse_item_implementation(
+        &mut self,
+        attrs: Vec<Attribute>,
+        macros_allowed: bool,
+        attributes_allowed: bool,
+    ) -> PResult<'a, Option<P<Item>>> {
+        maybe_whole!(self, NtItem, |item| {
+            let mut item = item.into_inner();
+            let mut attrs = attrs;
+            mem::swap(&mut item.attrs, &mut attrs);
+            item.attrs.extend(attrs);
+            Some(P(item))
+        });
+        let lo = self.span;
+        let visibility = self.parse_visibility(false)?;
+        if self.eat_keyword(keywords::Use) {
+            // USE ITEM
+            let item_ = ItemKind::Use(P(self.parse_use_tree()?));
+            self.expect(&token::Semi)?;
+            let span = lo.to(self.prev_span);
+            let item = self.mk_item(span, keywords::Invalid.ident(), item_, visibility, attrs);
+            return Ok(Some(item));
+        }
+        if self.eat_keyword(keywords::Extern) {
+            if self.eat_keyword(keywords::Crate) {
+                return Ok(Some(self.parse_item_extern_crate(lo, visibility, attrs)?));
+            }
+            let opt_abi = self.parse_opt_abi()?;
+            if self.eat_keyword(keywords::Fn) {
+                // EXTERN FUNCTION ITEM
+                let fn_span = self.prev_span;
+                let abi = opt_abi.unwrap_or(Abi::C);
+                let (ident, item_, extra_attrs) =
+                    self.parse_item_fn(Unsafety::Normal,
+                                       IsAsync::NotAsync,
+                                       respan(fn_span, Constness::NotConst),
+                                       abi)?;
+                let prev_span = self.prev_span;
+                let item = self.mk_item(lo.to(prev_span),
+                                        ident,
+                                        item_,
+                                        visibility,
+                                        maybe_append(attrs, extra_attrs));
+                return Ok(Some(item));
+            } else if self.check(&token::OpenDelim(token::Brace)) {
+                return Ok(Some(self.parse_item_foreign_mod(lo, opt_abi, visibility, attrs)?));
+            }
+            self.unexpected()?;
+        }
+        if self.is_static_global() {
+            self.bump();
+            // STATIC ITEM
+            let m = if self.eat_keyword(keywords::Mut) {
+                Mutability::Mutable
+            } else {
+                Mutability::Immutable
+            };
+            let (ident, item_, extra_attrs) = self.parse_item_const(Some(m))?;
+            let prev_span = self.prev_span;
+            let item = self.mk_item(lo.to(prev_span),
+                                    ident,
+                                    item_,
+                                    visibility,
+                                    maybe_append(attrs, extra_attrs));
+            return Ok(Some(item));
+        }
+        if self.eat_keyword(keywords::Const) {
+            let const_span = self.prev_span;
+            if self.check_keyword(keywords::Fn)
+                || (self.check_keyword(keywords::Unsafe)
+                    && self.look_ahead(1, |t| t.is_keyword(keywords::Fn))) {
+                // CONST FUNCTION ITEM
+                let unsafety = self.parse_unsafety();
+                self.bump();
+                let (ident, item_, extra_attrs) =
+                    self.parse_item_fn(unsafety,
+                                       IsAsync::NotAsync,
+                                       respan(const_span, Constness::Const),
+                                       Abi::Rust)?;
+                let prev_span = self.prev_span;
+                let item = self.mk_item(lo.to(prev_span),
+                                        ident,
+                                        item_,
+                                        visibility,
+                                        maybe_append(attrs, extra_attrs));
+                return Ok(Some(item));
+            }
+            // CONST ITEM
+            if self.eat_keyword(keywords::Mut) {
+                let prev_span = self.prev_span;
+                let mut err = self.diagnostic()
+                    .struct_span_err(prev_span, "const globals cannot be mutable");
+                err.span_label(prev_span, "cannot be mutable");
+                err.span_suggestion(
+                    const_span,
+                    "you might want to declare a static instead",
+                    "static".to_owned(),
+                    Applicability::MaybeIncorrect,
+                );
+                err.emit();
+            }
+            let (ident, item_, extra_attrs) = self.parse_item_const(None)?;
+            let prev_span = self.prev_span;
+            let item = self.mk_item(lo.to(prev_span),
+                                    ident,
+                                    item_,
+                                    visibility,
+                                    maybe_append(attrs, extra_attrs));
+            return Ok(Some(item));
+        }
+        // `unsafe async fn` or `async fn`
+        if (
+            self.check_keyword(keywords::Unsafe) &&
+            self.look_ahead(1, |t| t.is_keyword(keywords::Async))
+        ) || (
+            self.check_keyword(keywords::Async) &&
+            self.look_ahead(1, |t| t.is_keyword(keywords::Fn))
+        )
+        {
+            // ASYNC FUNCTION ITEM
+            let unsafety = self.parse_unsafety();
+            self.expect_keyword(keywords::Async)?;
+            self.expect_keyword(keywords::Fn)?;
+            let fn_span = self.prev_span;
+            let (ident, item_, extra_attrs) =
+                self.parse_item_fn(unsafety,
+                                   IsAsync::Async {
+                                       closure_id: ast::DUMMY_NODE_ID,
+                                       return_impl_trait_id: ast::DUMMY_NODE_ID,
+                                   },
+                                   respan(fn_span, Constness::NotConst),
+                                   Abi::Rust)?;
+            let prev_span = self.prev_span;
+            let item = self.mk_item(lo.to(prev_span),
+                                    ident,
+                                    item_,
+                                    visibility,
+                                    maybe_append(attrs, extra_attrs));
+            return Ok(Some(item));
+        }
+        if self.check_keyword(keywords::Unsafe) &&
+            (self.look_ahead(1, |t| t.is_keyword(keywords::Trait)) ||
+            self.look_ahead(1, |t| t.is_keyword(keywords::Auto)))
+        {
+            // UNSAFE TRAIT ITEM
+            self.bump(); // `unsafe`
+            let is_auto = if self.eat_keyword(keywords::Trait) {
+                IsAuto::No
+            } else {
+                self.expect_keyword(keywords::Auto)?;
+                self.expect_keyword(keywords::Trait)?;
+                IsAuto::Yes
+            };
+            let (ident, item_, extra_attrs) =
+                self.parse_item_trait(is_auto, Unsafety::Unsafe)?;
+            let prev_span = self.prev_span;
+            let item = self.mk_item(lo.to(prev_span),
+                                    ident,
+                                    item_,
+                                    visibility,
+                                    maybe_append(attrs, extra_attrs));
+            return Ok(Some(item));
+        }
+        if self.check_keyword(keywords::Impl) ||
+           self.check_keyword(keywords::Unsafe) &&
+                self.look_ahead(1, |t| t.is_keyword(keywords::Impl)) ||
+           self.check_keyword(keywords::Default) &&
+                self.look_ahead(1, |t| t.is_keyword(keywords::Impl)) ||
+           self.check_keyword(keywords::Default) &&
+                self.look_ahead(1, |t| t.is_keyword(keywords::Unsafe)) {
+            // IMPL ITEM
+            let defaultness = self.parse_defaultness();
+            let unsafety = self.parse_unsafety();
+            self.expect_keyword(keywords::Impl)?;
+            let (ident, item, extra_attrs) = self.parse_item_impl(unsafety, defaultness)?;
+            let span = lo.to(self.prev_span);
+            return Ok(Some(self.mk_item(span, ident, item, visibility,
+                                        maybe_append(attrs, extra_attrs))));
+        }
+        if self.check_keyword(keywords::Fn) {
+            // FUNCTION ITEM
+            self.bump();
+            let fn_span = self.prev_span;
+            let (ident, item_, extra_attrs) =
+                self.parse_item_fn(Unsafety::Normal,
+                                   IsAsync::NotAsync,
+                                   respan(fn_span, Constness::NotConst),
+                                   Abi::Rust)?;
+            let prev_span = self.prev_span;
+            let item = self.mk_item(lo.to(prev_span),
+                                    ident,
+                                    item_,
+                                    visibility,
+                                    maybe_append(attrs, extra_attrs));
+            return Ok(Some(item));
+        }
+        if self.check_keyword(keywords::Unsafe)
+            && self.look_ahead(1, |t| *t != token::OpenDelim(token::Brace)) {
+            // UNSAFE FUNCTION ITEM
+            self.bump(); // `unsafe`
+            // `{` is also expected after `unsafe`, in case of error, include it in the diagnostic
+            self.check(&token::OpenDelim(token::Brace));
+            let abi = if self.eat_keyword(keywords::Extern) {
+                self.parse_opt_abi()?.unwrap_or(Abi::C)
+            } else {
+                Abi::Rust
+            };
+            self.expect_keyword(keywords::Fn)?;
+            let fn_span = self.prev_span;
+            let (ident, item_, extra_attrs) =
+                self.parse_item_fn(Unsafety::Unsafe,
+                                   IsAsync::NotAsync,
+                                   respan(fn_span, Constness::NotConst),
+                                   abi)?;
+            let prev_span = self.prev_span;
+            let item = self.mk_item(lo.to(prev_span),
+                                    ident,
+                                    item_,
+                                    visibility,
+                                    maybe_append(attrs, extra_attrs));
+            return Ok(Some(item));
+        }
+        if self.eat_keyword(keywords::Mod) {
+            // MODULE ITEM
+            let (ident, item_, extra_attrs) =
+                self.parse_item_mod(&attrs[..])?;
+            let prev_span = self.prev_span;
+            let item = self.mk_item(lo.to(prev_span),
+                                    ident,
+                                    item_,
+                                    visibility,
+                                    maybe_append(attrs, extra_attrs));
+            return Ok(Some(item));
+        }
+        if let Some(type_) = self.eat_type() {
+            let (ident, alias, generics) = type_?;
+            // TYPE ITEM
+            let item_ = match alias {
+                AliasKind::Weak(ty) => ItemKind::Ty(ty, generics),
+                AliasKind::Existential(bounds) => ItemKind::Existential(bounds, generics),
+            };
+            let prev_span = self.prev_span;
+            let item = self.mk_item(lo.to(prev_span),
+                                    ident,
+                                    item_,
+                                    visibility,
+                                    attrs);
+            return Ok(Some(item));
+        }
+        if self.eat_keyword(keywords::Enum) {
+            // ENUM ITEM
+            let (ident, item_, extra_attrs) = self.parse_item_enum()?;
+            let prev_span = self.prev_span;
+            let item = self.mk_item(lo.to(prev_span),
+                                    ident,
+                                    item_,
+                                    visibility,
+                                    maybe_append(attrs, extra_attrs));
+            return Ok(Some(item));
+        }
+        if self.check_keyword(keywords::Trait)
+            || (self.check_keyword(keywords::Auto)
+                && self.look_ahead(1, |t| t.is_keyword(keywords::Trait)))
+        {
+            let is_auto = if self.eat_keyword(keywords::Trait) {
+                IsAuto::No
+            } else {
+                self.expect_keyword(keywords::Auto)?;
+                self.expect_keyword(keywords::Trait)?;
+                IsAuto::Yes
+            };
+            // TRAIT ITEM
+            let (ident, item_, extra_attrs) =
+                self.parse_item_trait(is_auto, Unsafety::Normal)?;
+            let prev_span = self.prev_span;
+            let item = self.mk_item(lo.to(prev_span),
+                                    ident,
+                                    item_,
+                                    visibility,
+                                    maybe_append(attrs, extra_attrs));
+            return Ok(Some(item));
+        }
+        if self.eat_keyword(keywords::Struct) {
+            // STRUCT ITEM
+            let (ident, item_, extra_attrs) = self.parse_item_struct()?;
+            let prev_span = self.prev_span;
+            let item = self.mk_item(lo.to(prev_span),
+                                    ident,
+                                    item_,
+                                    visibility,
+                                    maybe_append(attrs, extra_attrs));
+            return Ok(Some(item));
+        }
+        if self.is_union_item() {
+            // UNION ITEM
+            self.bump();
+            let (ident, item_, extra_attrs) = self.parse_item_union()?;
+            let prev_span = self.prev_span;
+            let item = self.mk_item(lo.to(prev_span),
+                                    ident,
+                                    item_,
+                                    visibility,
+                                    maybe_append(attrs, extra_attrs));
+            return Ok(Some(item));
+        }
+        if let Some(macro_def) = self.eat_macro_def(&attrs, &visibility, lo)? {
+            return Ok(Some(macro_def));
+        }
+        // Verify whether we have encountered a struct or method definition where the user forgot to
+        // add the `struct` or `fn` keyword after writing `pub`: `pub S {}`
+        if visibility.node.is_pub() &&
+            self.check_ident() &&
+            self.look_ahead(1, |t| *t != token::Not)
+        {
+            // Space between `pub` keyword and the identifier
+            //
+            //     pub   S {}
+            //        ^^^ `sp` points here
+            let sp = self.prev_span.between(self.span);
+            let full_sp = self.prev_span.to(self.span);
+            let ident_sp = self.span;
+            if self.look_ahead(1, |t| *t == token::OpenDelim(token::Brace)) {
+                // possible public struct definition where `struct` was forgotten
+                let ident = self.parse_ident().unwrap();
+                let msg = format!("add `struct` here to parse `{}` as a public struct",
+                                  ident);
+                let mut err = self.diagnostic()
+                    .struct_span_err(sp, "missing `struct` for struct definition");
+                err.span_suggestion_short(
+                    sp, &msg, " struct ".into(), Applicability::MaybeIncorrect // speculative
+                );
+                return Err(err);
+            } else if self.look_ahead(1, |t| *t == token::OpenDelim(token::Paren)) {
+                let ident = self.parse_ident().unwrap();
+                self.bump();  // `(`
+                let kw_name = if let Ok(Some(_)) = self.parse_self_arg() {
+                    "method"
+                } else {
+                    "function"
+                };
+                self.consume_block(token::Paren);
+                let (kw, kw_name, ambiguous) = if self.check(&token::RArrow) {
+                    self.eat_to_tokens(&[&token::OpenDelim(token::Brace)]);
+                    self.bump();  // `{`
+                    ("fn", kw_name, false)
+                } else if self.check(&token::OpenDelim(token::Brace)) {
+                    self.bump();  // `{`
+                    ("fn", kw_name, false)
+                } else if self.check(&token::Colon) {
+                    let kw = "struct";
+                    (kw, kw, false)
+                } else {
+                    ("fn` or `struct", "function or struct", true)
+                };
+                self.consume_block(token::Brace);
+                let msg = format!("missing `{}` for {} definition", kw, kw_name);
+                let mut err = self.diagnostic().struct_span_err(sp, &msg);
+                if !ambiguous {
+                    let suggestion = format!("add `{}` here to parse `{}` as a public {}",
+                                             kw,
+                                             ident,
+                                             kw_name);
+                    err.span_suggestion_short(
+                        sp, &suggestion, format!(" {} ", kw), Applicability::MachineApplicable
+                    );
+                } else {
+                    if let Ok(snippet) = self.sess.source_map().span_to_snippet(ident_sp) {
+                        err.span_suggestion(
+                            full_sp,
+                            "if you meant to call a macro, try",
+                            format!("{}!", snippet),
+                            // this is the `ambiguous` conditional branch
+                            Applicability::MaybeIncorrect
+                        );
+                    } else {
+                        err.help("if you meant to call a macro, remove the `pub` \
+                                  and add a trailing `!` after the identifier");
+                    }
+                }
+                return Err(err);
+            } else if self.look_ahead(1, |t| *t == token::Lt) {
+                let ident = self.parse_ident().unwrap();
+                self.eat_to_tokens(&[&token::Gt]);
+                self.bump();  // `>`
+                let (kw, kw_name, ambiguous) = if self.eat(&token::OpenDelim(token::Paren)) {
+                    if let Ok(Some(_)) = self.parse_self_arg() {
+                        ("fn", "method", false)
+                    } else {
+                        ("fn", "function", false)
+                    }
+                } else if self.check(&token::OpenDelim(token::Brace)) {
+                    ("struct", "struct", false)
+                } else {
+                    ("fn` or `struct", "function or struct", true)
+                };
+                let msg = format!("missing `{}` for {} definition", kw, kw_name);
+                let mut err = self.diagnostic().struct_span_err(sp, &msg);
+                if !ambiguous {
+                    err.span_suggestion_short(
+                        sp,
+                        &format!("add `{}` here to parse `{}` as a public {}", kw, ident, kw_name),
+                        format!(" {} ", kw),
+                        Applicability::MachineApplicable,
+                    );
+                }
+                return Err(err);
+            }
+        }
+        self.parse_macro_use_or_failure(attrs, macros_allowed, attributes_allowed, lo, visibility)
+    }
+    /// Parses a foreign item.
+    crate fn parse_foreign_item(&mut self) -> PResult<'a, ForeignItem> {
+        maybe_whole!(self, NtForeignItem, |ni| ni);
+        let attrs = self.parse_outer_attributes()?;
+        let lo = self.span;
+        let visibility = self.parse_visibility(false)?;
+        // FOREIGN STATIC ITEM
+        // Treat `const` as `static` for error recovery, but don't add it to expected tokens.
+        if self.check_keyword(keywords::Static) || self.token.is_keyword(keywords::Const) {
+            if self.token.is_keyword(keywords::Const) {
+                self.diagnostic()
+                    .struct_span_err(self.span, "extern items cannot be `const`")
+                    .span_suggestion(
+                        self.span,
+                        "try using a static value",
+                        "static".to_owned(),
+                        Applicability::MachineApplicable
+                    ).emit();
+            }
+            self.bump(); // `static` or `const`
+            return Ok(self.parse_item_foreign_static(visibility, lo, attrs)?);
+        }
+        // FOREIGN FUNCTION ITEM
+        if self.check_keyword(keywords::Fn) {
+            return Ok(self.parse_item_foreign_fn(visibility, lo, attrs)?);
+        }
+        // FOREIGN TYPE ITEM
+        if self.check_keyword(keywords::Type) {
+            return Ok(self.parse_item_foreign_type(visibility, lo, attrs)?);
+        }
+        match self.parse_assoc_macro_invoc("extern", Some(&visibility), &mut false)? {
+            Some(mac) => {
+                Ok(
+                    ForeignItem {
+                        ident: keywords::Invalid.ident(),
+                        span: lo.to(self.prev_span),
+                        id: ast::DUMMY_NODE_ID,
+                        attrs,
+                        vis: visibility,
+                        node: ForeignItemKind::Macro(mac),
+                    }
+                )
+            }
+            None => {
+                if !attrs.is_empty()  {
+                    self.expected_item_err(&attrs)?;
+                }
+                self.unexpected()
+            }
+        }
+    }
+    /// This is the fall-through for parsing items.
+    fn parse_macro_use_or_failure(
+        &mut self,
+        attrs: Vec<Attribute> ,
+        macros_allowed: bool,
+        attributes_allowed: bool,
+        lo: Span,
+        visibility: Visibility
+    ) -> PResult<'a, Option<P<Item>>> {
+        if macros_allowed && self.token.is_path_start() {
+            // MACRO INVOCATION ITEM
+            let prev_span = self.prev_span;
+            self.complain_if_pub_macro(&visibility.node, prev_span);
+            let mac_lo = self.span;
+            // item macro.
+            let pth = self.parse_path(PathStyle::Mod)?;
+            self.expect(&token::Not)?;
+            // a 'special' identifier (like what `macro_rules!` uses)
+            // is optional. We should eventually unify invoc syntax
+            // and remove this.
+            let id = if self.token.is_ident() {
+                self.parse_ident()?
+            } else {
+                keywords::Invalid.ident() // no special identifier
+            };
+            // eat a matched-delimiter token tree:
+            let (delim, tts) = self.expect_delimited_token_tree()?;
+            if delim != MacDelimiter::Brace {
+                if !self.eat(&token::Semi) {
+                    self.span_err(self.prev_span,
+                                  "macros that expand to items must either \
+                                   be surrounded with braces or followed by \
+                                   a semicolon");
+                }
+            }
+            let hi = self.prev_span;
+            let mac = respan(mac_lo.to(hi), Mac_ { path: pth, tts, delim });
+            let item = self.mk_item(lo.to(hi), id, ItemKind::Mac(mac), visibility, attrs);
+            return Ok(Some(item));
+        }
+        // FAILURE TO PARSE ITEM
+        match visibility.node {
+            VisibilityKind::Inherited => {}
+            _ => {
+                return Err(self.span_fatal(self.prev_span, "unmatched visibility `pub`"));
+            }
+        }
+        if !attributes_allowed && !attrs.is_empty() {
+            self.expected_item_err(&attrs)?;
+        }
+        Ok(None)
+    }
+    /// Parses a macro invocation inside a `trait`, `impl` or `extern` block.
+    fn parse_assoc_macro_invoc(&mut self, item_kind: &str, vis: Option<&Visibility>,
+                               at_end: &mut bool) -> PResult<'a, Option<Mac>>
+    {
+        if self.token.is_path_start() {
+            let prev_span = self.prev_span;
+            let lo = self.span;
+            let pth = self.parse_path(PathStyle::Mod)?;
+            if pth.segments.len() == 1 {
+                if !self.eat(&token::Not) {
+                    return Err(self.missing_assoc_item_kind_err(item_kind, prev_span));
+                }
+            } else {
+                self.expect(&token::Not)?;
+            }
+            if let Some(vis) = vis {
+                self.complain_if_pub_macro(&vis.node, prev_span);
+            }
+            *at_end = true;
+            // eat a matched-delimiter token tree:
+            let (delim, tts) = self.expect_delimited_token_tree()?;
+            if delim != MacDelimiter::Brace {
+                self.expect(&token::Semi)?;
+            }
+            Ok(Some(respan(lo.to(self.prev_span), Mac_ { path: pth, tts, delim })))
+        } else {
+            Ok(None)
+        }
+    }
+    fn collect_tokens<F, R>(&mut self, f: F) -> PResult<'a, (R, TokenStream)>
+        where F: FnOnce(&mut Self) -> PResult<'a, R>
+    {
+        // Record all tokens we parse when parsing this item.
+        let mut tokens = Vec::new();
+        let prev_collecting = match self.token_cursor.frame.last_token {
+            LastToken::Collecting(ref mut list) => {
+                Some(mem::replace(list, Vec::new()))
+            }
+            LastToken::Was(ref mut last) => {
+                tokens.extend(last.take());
+                None
+            }
+        };
+        self.token_cursor.frame.last_token = LastToken::Collecting(tokens);
+        let prev = self.token_cursor.stack.len();
+        let ret = f(self);
+        let last_token = if self.token_cursor.stack.len() == prev {
+            &mut self.token_cursor.frame.last_token
+        } else {
+            &mut self.token_cursor.stack[prev].last_token
+        };
+        // Pull out the tokens that we've collected from the call to `f` above.
+        let mut collected_tokens = match *last_token {
+            LastToken::Collecting(ref mut v) => mem::replace(v, Vec::new()),
+            LastToken::Was(_) => panic!("our vector went away?"),
+        };
+        // If we're not at EOF our current token wasn't actually consumed by
+        // `f`, but it'll still be in our list that we pulled out. In that case
+        // put it back.
+        let extra_token = if self.token != token::Eof {
+            collected_tokens.pop()
+        } else {
+            None
+        };
+        // If we were previously collecting tokens, then this was a recursive
+        // call. In that case we need to record all the tokens we collected in
+        // our parent list as well. To do that we push a clone of our stream
+        // onto the previous list.
+        match prev_collecting {
+            Some(mut list) => {
+                list.extend(collected_tokens.iter().cloned());
+                list.extend(extra_token);
+                *last_token = LastToken::Collecting(list);
+            }
+            None => {
+                *last_token = LastToken::Was(extra_token);
+            }
+        }
+        Ok((ret?, TokenStream::new(collected_tokens)))
+    }
+    pub fn parse_item(&mut self) -> PResult<'a, Option<P<Item>>> {
+        let attrs = self.parse_outer_attributes()?;
+        self.parse_item_(attrs, true, false)
+    }
+    /// `::{` or `::*`
+    fn is_import_coupler(&mut self) -> bool {
+        self.check(&token::ModSep) &&
+            self.look_ahead(1, |t| *t == token::OpenDelim(token::Brace) ||
+                                   *t == token::BinOp(token::Star))
+    }
+    /// Parses a `UseTree`.
+    ///
+    /// ```
+    /// USE_TREE = [`::`] `*` |
+    ///            [`::`] `{` USE_TREE_LIST `}` |
+    ///            PATH `::` `*` |
+    ///            PATH `::` `{` USE_TREE_LIST `}` |
+    ///            PATH [`as` IDENT]
+    /// ```
+    fn parse_use_tree(&mut self) -> PResult<'a, UseTree> {
+        let lo = self.span;
+        let mut prefix = ast::Path { segments: Vec::new(), span: lo.shrink_to_lo() };
+        let kind = if self.check(&token::OpenDelim(token::Brace)) ||
+                      self.check(&token::BinOp(token::Star)) ||
+                      self.is_import_coupler() {
+            // `use *;` or `use ::*;` or `use {...};` or `use ::{...};`
+            let mod_sep_ctxt = self.span.ctxt();
+            if self.eat(&token::ModSep) {
+                prefix.segments.push(
+                    PathSegment::path_root(lo.shrink_to_lo().with_ctxt(mod_sep_ctxt))
+                );
+            }
+            if self.eat(&token::BinOp(token::Star)) {
+                UseTreeKind::Glob
+            } else {
+                UseTreeKind::Nested(self.parse_use_tree_list()?)
+            }
+        } else {
+            // `use path::*;` or `use path::{...};` or `use path;` or `use path as bar;`
+            prefix = self.parse_path(PathStyle::Mod)?;
+            if self.eat(&token::ModSep) {
+                if self.eat(&token::BinOp(token::Star)) {
+                    UseTreeKind::Glob
+                } else {
+                    UseTreeKind::Nested(self.parse_use_tree_list()?)
+                }
+            } else {
+                UseTreeKind::Simple(self.parse_rename()?, ast::DUMMY_NODE_ID, ast::DUMMY_NODE_ID)
+            }
+        };
+        Ok(UseTree { prefix, kind, span: lo.to(self.prev_span) })
+    }
+    /// Parses a `UseTreeKind::Nested(list)`.
+    ///
+    /// ```
+    /// USE_TREE_LIST = Ø | (USE_TREE `,`)* USE_TREE [`,`]
+    /// ```
+    fn parse_use_tree_list(&mut self) -> PResult<'a, Vec<(UseTree, ast::NodeId)>> {
+        self.parse_unspanned_seq(&token::OpenDelim(token::Brace),
+                                 &token::CloseDelim(token::Brace),
+                                 SeqSep::trailing_allowed(token::Comma), |this| {
+            Ok((this.parse_use_tree()?, ast::DUMMY_NODE_ID))
+        })
+    }
+    fn parse_rename(&mut self) -> PResult<'a, Option<Ident>> {
+        if self.eat_keyword(keywords::As) {
+            self.parse_ident_or_underscore().map(Some)
+        } else {
+            Ok(None)
+        }
+    }
+    /// Parses a source module as a crate. This is the main entry point for the parser.
+    pub fn parse_crate_mod(&mut self) -> PResult<'a, Crate> {
+        let lo = self.span;
+        let krate = Ok(ast::Crate {
+            attrs: self.parse_inner_attributes()?,
+            module: self.parse_mod_items(&token::Eof, lo)?,
+            span: lo.to(self.span),
+        });
+        emit_unclosed_delims(&self.unclosed_delims, self.diagnostic());
+        self.unclosed_delims.clear();
+        krate
+    }
+    pub fn parse_optional_str(&mut self) -> Option<(Symbol, ast::StrStyle, Option<ast::Name>)> {
+        let ret = match self.token {
+            token::Literal(token::Str_(s), suf) => (s, ast::StrStyle::Cooked, suf),
+            token::Literal(token::StrRaw(s, n), suf) => (s, ast::StrStyle::Raw(n), suf),
+            _ => return None
+        };
+        self.bump();
+        Some(ret)
+    }
+    pub fn parse_str(&mut self) -> PResult<'a, (Symbol, StrStyle)> {
+        match self.parse_optional_str() {
+            Some((s, style, suf)) => {
+                let sp = self.prev_span;
+                self.expect_no_suffix(sp, "string literal", suf);
+                Ok((s, style))
+            }
+            _ => {
+                let msg = "expected string literal";
+                let mut err = self.fatal(msg);
+                err.span_label(self.span, msg);
+                Err(err)
+            }
+        }
+    }
+}
+pub fn emit_unclosed_delims(unclosed_delims: &[UnmatchedBrace], handler: &errors::Handler) {
+    for unmatched in unclosed_delims {
+        let mut err = handler.struct_span_err(unmatched.found_span, &format!(
+            "incorrect close delimiter: `{}`",
+            pprust::token_to_string(&token::Token::CloseDelim(unmatched.found_delim)),
+        ));
+        err.span_label(unmatched.found_span, "incorrect close delimiter");
+        if let Some(sp) = unmatched.candidate_span {
+            err.span_label(sp, "close delimiter possibly meant for this");
+        }
+        if let Some(sp) = unmatched.unclosed_span {
+            err.span_label(sp, "un-closed delimiter");
+        }
+        err.emit();
+    }
+}
diff --git a/bench_data/numerous_macro_rules b/bench_data/numerous_macro_rules
new file mode 100644
index 000000000..bf89ed594
--- /dev/null
+++ b/bench_data/numerous_macro_rules
@@ -0,0 +1,560 @@
+macro_rules! __ra_macro_fixture0 {($T :  ident )=>( int_module ! ($T , # [ stable ( feature =  "rust1" ,  since =  "1.0.0" )]);); ($T :  ident , # [$attr :  meta ])=>( doc_comment ! { concat ! ( "The smallest value that can be represented by this integer type.\nUse [`" ,  stringify ! ($T ),  "::MIN" ,  "`](../../std/primitive." ,  stringify ! ($T ),  ".html#associatedconstant.MIN) instead.\n\n# Examples\n\n```rust\n// deprecated way\nlet min = std::" ,  stringify ! ($T ),  "::MIN;\n\n// intended way\nlet min = " ,  stringify ! ($T ),  "::MIN;\n```\n" ), # [$attr ] pub  const  MIN : $T = $T ::  MIN ; } doc_comment ! { concat ! ( "The largest value that can be represented by this integer type.\nUse [`" ,  stringify ! ($T ),  "::MAX" ,  "`](../../std/primitive." ,  stringify ! ($T ),  ".html#associatedconstant.MAX) instead.\n\n# Examples\n\n```rust\n// deprecated way\nlet max = std::" ,  stringify ! ($T ),  "::MAX;\n\n// intended way\nlet max = " ,  stringify ! ($T ),  "::MAX;\n```\n" ), # [$attr ] pub  const  MAX : $T = $T ::  MAX ; })}
+macro_rules! __ra_macro_fixture1 {($($ty :  ty :  add ($addfn :  path ),  mul /  div ($bigty :  ident );)*)=>($(impl  FullOps  for $ty { fn  full_add ( self ,  other : $ty ,  carry :  bool )-> ( bool , $ty ){ let ( v ,  carry1 )=  intrinsics ::  add_with_overflow ( self ,  other );  let ( v ,  carry2 )=  intrinsics ::  add_with_overflow ( v ,  if  carry { 1 } else { 0 }); ( carry1 ||  carry2 ,  v )} fn  full_mul ( self ,  other : $ty ,  carry : $ty )-> ($ty , $ty ){ let  v = ( self  as $bigty )* ( other  as $bigty )+ ( carry  as $bigty ); (( v >> <$ty >::  BITS ) as $ty ,  v  as $ty )} fn  full_mul_add ( self ,  other : $ty ,  other2 : $ty ,  carry : $ty )-> ($ty , $ty ){ let  v = ( self  as $bigty )* ( other  as $bigty )+ ( other2  as $bigty )+ ( carry  as $bigty ); (( v >> <$ty >::  BITS ) as $ty ,  v  as $ty )} fn  full_div_rem ( self ,  other : $ty ,  borrow : $ty )-> ($ty , $ty ){ debug_assert ! ( borrow <  other );  let  lhs = (( borrow  as $bigty )<< <$ty >::  BITS )| ( self  as $bigty );  let  rhs =  other  as $bigty ; (( lhs /  rhs ) as $ty , ( lhs %  rhs ) as $ty )}})* )}
+macro_rules! __ra_macro_fixture2 {($name :  ident :  type =$ty :  ty ,  n =$n :  expr )=>{# [ doc =  " Stack-allocated arbitrary-precision (up to certain limit) integer." ]# [ doc =  "" ]# [ doc =  " This is backed by a fixed-size array of given type (\\\"digit\\\")." ]# [ doc =  " While the array is not very large (normally some hundred bytes)," ]# [ doc =  " copying it recklessly may result in the performance hit." ]# [ doc =  " Thus this is intentionally not `Copy`." ]# [ doc =  "" ]# [ doc =  " All operations available to bignums panic in the case of overflows." ]# [ doc =  " The caller is responsible to use large enough bignum types." ] pub  struct $name {# [ doc =  " One plus the offset to the maximum \\\"digit\\\" in use." ]# [ doc =  " This does not decrease, so be aware of the computation order." ]# [ doc =  " `base[size..]` should be zero." ] size :  usize , # [ doc =  " Digits. `[a, b, c, ...]` represents `a + b*2^W + c*2^(2W) + ...`" ]# [ doc =  " where `W` is the number of bits in the digit type." ] base : [$ty ; $n ], } impl $name {# [ doc =  " Makes a bignum from one digit." ] pub  fn  from_small ( v : $ty )-> $name { let  mut  base = [ 0 ; $n ];  base [ 0 ]=  v ; $name { size :  1 ,  base :  base }}# [ doc =  " Makes a bignum from `u64` value." ] pub  fn  from_u64 ( mut  v :  u64 )-> $name { let  mut  base = [ 0 ; $n ];  let  mut  sz =  0 ;  while  v >  0 { base [ sz ]=  v  as $ty ;  v >>= <$ty >::  BITS ;  sz +=  1 ; }$name { size :  sz ,  base :  base }}# [ doc =  " Returns the internal digits as a slice `[a, b, c, ...]` such that the numeric" ]# [ doc =  " value is `a + b * 2^W + c * 2^(2W) + ...` where `W` is the number of bits in" ]# [ doc =  " the digit type." ] pub  fn  digits (&  self )-> & [$ty ]{&  self .  base [..  self .  size ]}# [ doc =  " Returns the `i`-th bit where bit 0 is the least significant one." ]# [ doc =  " In other words, the bit with weight `2^i`." ] pub  fn  get_bit (&  self ,  i :  usize )->  u8 { let  digitbits = <$ty >::  BITS  as  usize ;  let  d =  i /  digitbits ;  let  b =  i %  digitbits ; (( self .  base [ d ]>>  b )&  1 ) as  u8 }# [ doc =  " Returns `true` if the bignum is zero." ] pub  fn  is_zero (&  self )->  bool { self .  digits ().  iter ().  all (|&  v |  v ==  0 )}# [ doc =  " Returns the number of bits necessary to represent this value. Note that zero" ]# [ doc =  " is considered to need 0 bits." ] pub  fn  bit_length (&  self )->  usize { let  digits =  self .  digits ();  let  zeros =  digits .  iter ().  rev ().  take_while (|&&  x |  x ==  0 ).  count ();  let  end =  digits .  len ()-  zeros ;  let  nonzero = &  digits [..  end ];  if  nonzero .  is_empty (){ return  0 ; } let  digitbits = <$ty >::  BITS  as  usize ;  let  mut  i =  nonzero .  len ()*  digitbits -  1 ;  while  self .  get_bit ( i )==  0 { i -=  1 ; } i +  1 }# [ doc =  " Adds `other` to itself and returns its own mutable reference." ] pub  fn  add < 'a > (& 'a  mut  self ,  other : &$name )-> & 'a  mut $name { use  crate ::  cmp ;  use  crate ::  num ::  bignum ::  FullOps ;  let  mut  sz =  cmp ::  max ( self .  size ,  other .  size );  let  mut  carry =  false ;  for ( a ,  b ) in  self .  base [..  sz ].  iter_mut ().  zip (&  other .  base [..  sz ]){ let ( c ,  v )= (*  a ).  full_add (*  b ,  carry ); *  a =  v ;  carry =  c ; } if  carry { self .  base [ sz ]=  1 ;  sz +=  1 ; } self .  size =  sz ;  self } pub  fn  add_small (&  mut  self ,  other : $ty )-> &  mut $name { use  crate ::  num ::  bignum ::  FullOps ;  let ( mut  carry ,  v )=  self .  base [ 0 ].  full_add ( other ,  false );  self .  base [ 0 ]=  v ;  let  mut  i =  1 ;  while  carry { let ( c ,  v )=  self .  base [ i ].  full_add ( 0 ,  carry );  self .  base [ i ]=  v ;  carry =  c ;  i +=  1 ; } if  i >  self .  size { self .  size =  i ; } self }# [ doc =  " Subtracts `other` from itself and returns its own mutable reference." ] pub  fn  sub < 'a > (& 'a  mut  self ,  other : &$name )-> & 'a  mut $name { use  crate ::  cmp ;  use  crate ::  num ::  bignum ::  FullOps ;  let  sz =  cmp ::  max ( self .  size ,  other .  size );  let  mut  noborrow =  true ;  for ( a ,  b ) in  self .  base [..  sz ].  iter_mut ().  zip (&  other .  base [..  sz ]){ let ( c ,  v )= (*  a ).  full_add (!*  b ,  noborrow ); *  a =  v ;  noborrow =  c ; } assert ! ( noborrow );  self .  size =  sz ;  self }# [ doc =  " Multiplies itself by a digit-sized `other` and returns its own" ]# [ doc =  " mutable reference." ] pub  fn  mul_small (&  mut  self ,  other : $ty )-> &  mut $name { use  crate ::  num ::  bignum ::  FullOps ;  let  mut  sz =  self .  size ;  let  mut  carry =  0 ;  for  a  in &  mut  self .  base [..  sz ]{ let ( c ,  v )= (*  a ).  full_mul ( other ,  carry ); *  a =  v ;  carry =  c ; } if  carry >  0 { self .  base [ sz ]=  carry ;  sz +=  1 ; } self .  size =  sz ;  self }# [ doc =  " Multiplies itself by `2^bits` and returns its own mutable reference." ] pub  fn  mul_pow2 (&  mut  self ,  bits :  usize )-> &  mut $name { let  digitbits = <$ty >::  BITS  as  usize ;  let  digits =  bits /  digitbits ;  let  bits =  bits %  digitbits ;  assert ! ( digits < $n );  debug_assert ! ( self .  base [$n -  digits ..].  iter ().  all (|&  v |  v ==  0 ));  debug_assert ! ( bits ==  0 || ( self .  base [$n -  digits -  1 ]>> ( digitbits -  bits ))==  0 );  for  i  in ( 0 ..  self .  size ).  rev (){ self .  base [ i +  digits ]=  self .  base [ i ]; } for  i  in  0 ..  digits { self .  base [ i ]=  0 ; } let  mut  sz =  self .  size +  digits ;  if  bits >  0 { let  last =  sz ;  let  overflow =  self .  base [ last -  1 ]>> ( digitbits -  bits );  if  overflow >  0 { self .  base [ last ]=  overflow ;  sz +=  1 ; } for  i  in ( digits +  1 ..  last ).  rev (){ self .  base [ i ]= ( self .  base [ i ]<<  bits )| ( self .  base [ i -  1 ]>> ( digitbits -  bits )); } self .  base [ digits ]<<=  bits ; } self .  size =  sz ;  self }# [ doc =  " Multiplies itself by `5^e` and returns its own mutable reference." ] pub  fn  mul_pow5 (&  mut  self ,  mut  e :  usize )-> &  mut $name { use  crate ::  mem ;  use  crate ::  num ::  bignum ::  SMALL_POW5 ;  let  table_index =  mem ::  size_of ::<$ty > ().  trailing_zeros () as  usize ;  let ( small_power ,  small_e )=  SMALL_POW5 [ table_index ];  let  small_power =  small_power  as $ty ;  while  e >=  small_e { self .  mul_small ( small_power );  e -=  small_e ; } let  mut  rest_power =  1 ;  for _  in  0 ..  e { rest_power *=  5 ; } self .  mul_small ( rest_power );  self }# [ doc =  " Multiplies itself by a number described by `other[0] + other[1] * 2^W +" ]# [ doc =  " other[2] * 2^(2W) + ...` (where `W` is the number of bits in the digit type)" ]# [ doc =  " and returns its own mutable reference." ] pub  fn  mul_digits < 'a > (& 'a  mut  self ,  other : & [$ty ])-> & 'a  mut $name { fn  mul_inner ( ret : &  mut [$ty ; $n ],  aa : & [$ty ],  bb : & [$ty ])->  usize { use  crate ::  num ::  bignum ::  FullOps ;  let  mut  retsz =  0 ;  for ( i , &  a ) in  aa .  iter ().  enumerate (){ if  a ==  0 { continue ; } let  mut  sz =  bb .  len ();  let  mut  carry =  0 ;  for ( j , &  b ) in  bb .  iter ().  enumerate (){ let ( c ,  v )=  a .  full_mul_add ( b ,  ret [ i +  j ],  carry );  ret [ i +  j ]=  v ;  carry =  c ; } if  carry >  0 { ret [ i +  sz ]=  carry ;  sz +=  1 ; } if  retsz <  i +  sz { retsz =  i +  sz ; }} retsz } let  mut  ret = [ 0 ; $n ];  let  retsz =  if  self .  size <  other .  len (){ mul_inner (&  mut  ret , &  self .  digits (),  other )} else { mul_inner (&  mut  ret ,  other , &  self .  digits ())};  self .  base =  ret ;  self .  size =  retsz ;  self }# [ doc =  " Divides itself by a digit-sized `other` and returns its own" ]# [ doc =  " mutable reference *and* the remainder." ] pub  fn  div_rem_small (&  mut  self ,  other : $ty )-> (&  mut $name , $ty ){ use  crate ::  num ::  bignum ::  FullOps ;  assert ! ( other >  0 );  let  sz =  self .  size ;  let  mut  borrow =  0 ;  for  a  in  self .  base [..  sz ].  iter_mut ().  rev (){ let ( q ,  r )= (*  a ).  full_div_rem ( other ,  borrow ); *  a =  q ;  borrow =  r ; }( self ,  borrow )}# [ doc =  " Divide self by another bignum, overwriting `q` with the quotient and `r` with the" ]# [ doc =  " remainder." ] pub  fn  div_rem (&  self ,  d : &$name ,  q : &  mut $name ,  r : &  mut $name ){ assert ! (!  d .  is_zero ());  let  digitbits = <$ty >::  BITS  as  usize ;  for  digit  in &  mut  q .  base [..]{*  digit =  0 ; } for  digit  in &  mut  r .  base [..]{*  digit =  0 ; } r .  size =  d .  size ;  q .  size =  1 ;  let  mut  q_is_zero =  true ;  let  end =  self .  bit_length ();  for  i  in ( 0 ..  end ).  rev (){ r .  mul_pow2 ( 1 );  r .  base [ 0 ]|=  self .  get_bit ( i ) as $ty ;  if &*  r >=  d { r .  sub ( d );  let  digit_idx =  i /  digitbits ;  let  bit_idx =  i %  digitbits ;  if  q_is_zero { q .  size =  digit_idx +  1 ;  q_is_zero =  false ; } q .  base [ digit_idx ]|=  1 <<  bit_idx ; }} debug_assert ! ( q .  base [ q .  size ..].  iter ().  all (|&  d |  d ==  0 ));  debug_assert ! ( r .  base [ r .  size ..].  iter ().  all (|&  d |  d ==  0 )); }} impl  crate ::  cmp ::  PartialEq  for $name { fn  eq (&  self ,  other : &$name )->  bool { self .  base [..]==  other .  base [..]}} impl  crate ::  cmp ::  Eq  for $name {} impl  crate ::  cmp ::  PartialOrd  for $name { fn  partial_cmp (&  self ,  other : &$name )->  crate ::  option ::  Option <  crate ::  cmp ::  Ordering > { crate ::  option ::  Option ::  Some ( self .  cmp ( other ))}} impl  crate ::  cmp ::  Ord  for $name { fn  cmp (&  self ,  other : &$name )->  crate ::  cmp ::  Ordering { use  crate ::  cmp ::  max ;  let  sz =  max ( self .  size ,  other .  size );  let  lhs =  self .  base [..  sz ].  iter ().  cloned ().  rev ();  let  rhs =  other .  base [..  sz ].  iter ().  cloned ().  rev ();  lhs .  cmp ( rhs )}} impl  crate ::  clone ::  Clone  for $name { fn  clone (&  self )->  Self { Self { size :  self .  size ,  base :  self .  base }}} impl  crate ::  fmt ::  Debug  for $name { fn  fmt (&  self ,  f : &  mut  crate ::  fmt ::  Formatter < '_ >)->  crate ::  fmt ::  Result { let  sz =  if  self .  size <  1 { 1 } else { self .  size };  let  digitlen = <$ty >::  BITS  as  usize /  4 ;  write ! ( f ,  "{:#x}" ,  self .  base [ sz -  1 ])?;  for &  v  in  self .  base [..  sz -  1 ].  iter ().  rev (){ write ! ( f ,  "_{:01$x}" ,  v ,  digitlen )?; } crate ::  result ::  Result ::  Ok (())}}}; }
+macro_rules! __ra_macro_fixture3 {($t :  ty )=>{# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  FromStr  for $t { type  Err =  ParseFloatError ; # [ doc =  " Converts a string in base 10 to a float." ]# [ doc =  " Accepts an optional decimal exponent." ]# [ doc =  "" ]# [ doc =  " This function accepts strings such as" ]# [ doc =  "" ]# [ doc =  " * \\\'3.14\\\'" ]# [ doc =  " * \\\'-3.14\\\'" ]# [ doc =  " * \\\'2.5E10\\\', or equivalently, \\\'2.5e10\\\'" ]# [ doc =  " * \\\'2.5E-10\\\'" ]# [ doc =  " * \\\'5.\\\'" ]# [ doc =  " * \\\'.5\\\', or, equivalently, \\\'0.5\\\'" ]# [ doc =  " * \\\'inf\\\', \\\'-inf\\\', \\\'NaN\\\'" ]# [ doc =  "" ]# [ doc =  " Leading and trailing whitespace represent an error." ]# [ doc =  "" ]# [ doc =  " # Grammar" ]# [ doc =  "" ]# [ doc =  " All strings that adhere to the following [EBNF] grammar" ]# [ doc =  " will result in an [`Ok`] being returned:" ]# [ doc =  "" ]# [ doc =  " ```txt" ]# [ doc =  " Float  ::= Sign? ( \\\'inf\\\' | \\\'NaN\\\' | Number )" ]# [ doc =  " Number ::= ( Digit+ |" ]# [ doc =  "              Digit+ \\\'.\\\' Digit* |" ]# [ doc =  "              Digit* \\\'.\\\' Digit+ ) Exp?" ]# [ doc =  " Exp    ::= [eE] Sign? Digit+" ]# [ doc =  " Sign   ::= [+-]" ]# [ doc =  " Digit  ::= [0-9]" ]# [ doc =  " ```" ]# [ doc =  "" ]# [ doc =  " [EBNF]: https://www.w3.org/TR/REC-xml/#sec-notation" ]# [ doc =  "" ]# [ doc =  " # Known bugs" ]# [ doc =  "" ]# [ doc =  " In some situations, some strings that should create a valid float" ]# [ doc =  " instead return an error. See [issue #31407] for details." ]# [ doc =  "" ]# [ doc =  " [issue #31407]: https://github.com/rust-lang/rust/issues/31407" ]# [ doc =  "" ]# [ doc =  " # Arguments" ]# [ doc =  "" ]# [ doc =  " * src - A string" ]# [ doc =  "" ]# [ doc =  " # Return value" ]# [ doc =  "" ]# [ doc =  " `Err(ParseFloatError)` if the string did not represent a valid" ]# [ doc =  " number. Otherwise, `Ok(n)` where `n` is the floating-point" ]# [ doc =  " number represented by `src`." ]# [ inline ] fn  from_str ( src : &  str )->  Result <  Self ,  ParseFloatError > { dec2flt ( src )}}}; }
+macro_rules! __ra_macro_fixture4 {($(# [$stability :  meta ]$Ty :  ident ($Int :  ty ); )+ )=>{$(doc_comment ! { concat ! ( "An integer that is known not to equal zero.\n\nThis enables some memory layout optimization.\nFor example, `Option<" ,  stringify ! ($Ty ),  ">` is the same size as `" ,  stringify ! ($Int ),  "`:\n\n```rust\nuse std::mem::size_of;\nassert_eq!(size_of::<Option<core::num::" ,  stringify ! ($Ty ),  ">>(), size_of::<" ,  stringify ! ($Int ),  ">());\n```" ), # [$stability ]# [ derive ( Copy ,  Clone ,  Eq ,  PartialEq ,  Ord ,  PartialOrd ,  Hash )]# [ repr ( transparent )]# [ rustc_layout_scalar_valid_range_start ( 1 )]# [ rustc_nonnull_optimization_guaranteed ] pub  struct $Ty ($Int ); } impl $Ty {# [ doc =  " Creates a non-zero without checking the value." ]# [ doc =  "" ]# [ doc =  " # Safety" ]# [ doc =  "" ]# [ doc =  " The value must not be zero." ]# [$stability ]# [ rustc_const_stable ( feature =  "nonzero" ,  since =  "1.34.0" )]# [ inline ] pub  const  unsafe  fn  new_unchecked ( n : $Int )->  Self { unsafe { Self ( n )}}# [ doc =  " Creates a non-zero if the given value is not zero." ]# [$stability ]# [ rustc_const_stable ( feature =  "const_nonzero_int_methods" ,  since =  "1.47.0" )]# [ inline ] pub  const  fn  new ( n : $Int )->  Option <  Self > { if  n !=  0 { Some ( unsafe { Self ( n )})} else { None }}# [ doc =  " Returns the value as a primitive type." ]# [$stability ]# [ inline ]# [ rustc_const_stable ( feature =  "nonzero" ,  since =  "1.34.0" )] pub  const  fn  get ( self )-> $Int { self .  0 }}# [ stable ( feature =  "from_nonzero" ,  since =  "1.31.0" )] impl  From <$Ty >  for $Int { doc_comment ! { concat ! ( "Converts a `" ,  stringify ! ($Ty ),  "` into an `" ,  stringify ! ($Int ),  "`" ), # [ inline ] fn  from ( nonzero : $Ty )->  Self { nonzero .  0 }}}# [ stable ( feature =  "nonzero_bitor" ,  since =  "1.45.0" )] impl  BitOr  for $Ty { type  Output =  Self ; # [ inline ] fn  bitor ( self ,  rhs :  Self )->  Self ::  Output { unsafe {$Ty ::  new_unchecked ( self .  get ()|  rhs .  get ())}}}# [ stable ( feature =  "nonzero_bitor" ,  since =  "1.45.0" )] impl  BitOr <$Int >  for $Ty { type  Output =  Self ; # [ inline ] fn  bitor ( self ,  rhs : $Int )->  Self ::  Output { unsafe {$Ty ::  new_unchecked ( self .  get ()|  rhs )}}}# [ stable ( feature =  "nonzero_bitor" ,  since =  "1.45.0" )] impl  BitOr <$Ty >  for $Int { type  Output = $Ty ; # [ inline ] fn  bitor ( self ,  rhs : $Ty )->  Self ::  Output { unsafe {$Ty ::  new_unchecked ( self |  rhs .  get ())}}}# [ stable ( feature =  "nonzero_bitor" ,  since =  "1.45.0" )] impl  BitOrAssign  for $Ty {# [ inline ] fn  bitor_assign (&  mut  self ,  rhs :  Self ){*  self = *  self |  rhs ; }}# [ stable ( feature =  "nonzero_bitor" ,  since =  "1.45.0" )] impl  BitOrAssign <$Int >  for $Ty {# [ inline ] fn  bitor_assign (&  mut  self ,  rhs : $Int ){*  self = *  self |  rhs ; }} impl_nonzero_fmt ! {# [$stability ]( Debug ,  Display ,  Binary ,  Octal ,  LowerHex ,  UpperHex ) for $Ty })+ }}
+macro_rules! __ra_macro_fixture5 {($($t :  ty )*)=>{$(# [ stable ( feature =  "nonzero_parse" ,  since =  "1.35.0" )] impl  FromStr  for $t { type  Err =  ParseIntError ;  fn  from_str ( src : &  str )->  Result <  Self ,  Self ::  Err > { Self ::  new ( from_str_radix ( src ,  10 )?).  ok_or ( ParseIntError { kind :  IntErrorKind ::  Zero })}})*}}
+macro_rules! __ra_macro_fixture6 {($($t :  ident )*)=>($(sh_impl_unsigned ! {$t ,  usize })*)}
+macro_rules! __ra_macro_fixture7 {($($t :  ty )*)=>($(# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  Add  for  Wrapping <$t > { type  Output =  Wrapping <$t >; # [ inline ] fn  add ( self ,  other :  Wrapping <$t >)->  Wrapping <$t > { Wrapping ( self .  0 .  wrapping_add ( other .  0 ))}} forward_ref_binop ! { impl  Add ,  add  for  Wrapping <$t >,  Wrapping <$t >, # [ stable ( feature =  "wrapping_ref" ,  since =  "1.14.0" )]}# [ stable ( feature =  "op_assign_traits" ,  since =  "1.8.0" )] impl  AddAssign  for  Wrapping <$t > {# [ inline ] fn  add_assign (&  mut  self ,  other :  Wrapping <$t >){*  self = *  self +  other ; }} forward_ref_op_assign ! { impl  AddAssign ,  add_assign  for  Wrapping <$t >,  Wrapping <$t > }# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  Sub  for  Wrapping <$t > { type  Output =  Wrapping <$t >; # [ inline ] fn  sub ( self ,  other :  Wrapping <$t >)->  Wrapping <$t > { Wrapping ( self .  0 .  wrapping_sub ( other .  0 ))}} forward_ref_binop ! { impl  Sub ,  sub  for  Wrapping <$t >,  Wrapping <$t >, # [ stable ( feature =  "wrapping_ref" ,  since =  "1.14.0" )]}# [ stable ( feature =  "op_assign_traits" ,  since =  "1.8.0" )] impl  SubAssign  for  Wrapping <$t > {# [ inline ] fn  sub_assign (&  mut  self ,  other :  Wrapping <$t >){*  self = *  self -  other ; }} forward_ref_op_assign ! { impl  SubAssign ,  sub_assign  for  Wrapping <$t >,  Wrapping <$t > }# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  Mul  for  Wrapping <$t > { type  Output =  Wrapping <$t >; # [ inline ] fn  mul ( self ,  other :  Wrapping <$t >)->  Wrapping <$t > { Wrapping ( self .  0 .  wrapping_mul ( other .  0 ))}} forward_ref_binop ! { impl  Mul ,  mul  for  Wrapping <$t >,  Wrapping <$t >, # [ stable ( feature =  "wrapping_ref" ,  since =  "1.14.0" )]}# [ stable ( feature =  "op_assign_traits" ,  since =  "1.8.0" )] impl  MulAssign  for  Wrapping <$t > {# [ inline ] fn  mul_assign (&  mut  self ,  other :  Wrapping <$t >){*  self = *  self *  other ; }} forward_ref_op_assign ! { impl  MulAssign ,  mul_assign  for  Wrapping <$t >,  Wrapping <$t > }# [ stable ( feature =  "wrapping_div" ,  since =  "1.3.0" )] impl  Div  for  Wrapping <$t > { type  Output =  Wrapping <$t >; # [ inline ] fn  div ( self ,  other :  Wrapping <$t >)->  Wrapping <$t > { Wrapping ( self .  0 .  wrapping_div ( other .  0 ))}} forward_ref_binop ! { impl  Div ,  div  for  Wrapping <$t >,  Wrapping <$t >, # [ stable ( feature =  "wrapping_ref" ,  since =  "1.14.0" )]}# [ stable ( feature =  "op_assign_traits" ,  since =  "1.8.0" )] impl  DivAssign  for  Wrapping <$t > {# [ inline ] fn  div_assign (&  mut  self ,  other :  Wrapping <$t >){*  self = *  self /  other ; }} forward_ref_op_assign ! { impl  DivAssign ,  div_assign  for  Wrapping <$t >,  Wrapping <$t > }# [ stable ( feature =  "wrapping_impls" ,  since =  "1.7.0" )] impl  Rem  for  Wrapping <$t > { type  Output =  Wrapping <$t >; # [ inline ] fn  rem ( self ,  other :  Wrapping <$t >)->  Wrapping <$t > { Wrapping ( self .  0 .  wrapping_rem ( other .  0 ))}} forward_ref_binop ! { impl  Rem ,  rem  for  Wrapping <$t >,  Wrapping <$t >, # [ stable ( feature =  "wrapping_ref" ,  since =  "1.14.0" )]}# [ stable ( feature =  "op_assign_traits" ,  since =  "1.8.0" )] impl  RemAssign  for  Wrapping <$t > {# [ inline ] fn  rem_assign (&  mut  self ,  other :  Wrapping <$t >){*  self = *  self %  other ; }} forward_ref_op_assign ! { impl  RemAssign ,  rem_assign  for  Wrapping <$t >,  Wrapping <$t > }# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  Not  for  Wrapping <$t > { type  Output =  Wrapping <$t >; # [ inline ] fn  not ( self )->  Wrapping <$t > { Wrapping (!  self .  0 )}} forward_ref_unop ! { impl  Not ,  not  for  Wrapping <$t >, # [ stable ( feature =  "wrapping_ref" ,  since =  "1.14.0" )]}# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  BitXor  for  Wrapping <$t > { type  Output =  Wrapping <$t >; # [ inline ] fn  bitxor ( self ,  other :  Wrapping <$t >)->  Wrapping <$t > { Wrapping ( self .  0 ^  other .  0 )}} forward_ref_binop ! { impl  BitXor ,  bitxor  for  Wrapping <$t >,  Wrapping <$t >, # [ stable ( feature =  "wrapping_ref" ,  since =  "1.14.0" )]}# [ stable ( feature =  "op_assign_traits" ,  since =  "1.8.0" )] impl  BitXorAssign  for  Wrapping <$t > {# [ inline ] fn  bitxor_assign (&  mut  self ,  other :  Wrapping <$t >){*  self = *  self ^  other ; }} forward_ref_op_assign ! { impl  BitXorAssign ,  bitxor_assign  for  Wrapping <$t >,  Wrapping <$t > }# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  BitOr  for  Wrapping <$t > { type  Output =  Wrapping <$t >; # [ inline ] fn  bitor ( self ,  other :  Wrapping <$t >)->  Wrapping <$t > { Wrapping ( self .  0 |  other .  0 )}} forward_ref_binop ! { impl  BitOr ,  bitor  for  Wrapping <$t >,  Wrapping <$t >, # [ stable ( feature =  "wrapping_ref" ,  since =  "1.14.0" )]}# [ stable ( feature =  "op_assign_traits" ,  since =  "1.8.0" )] impl  BitOrAssign  for  Wrapping <$t > {# [ inline ] fn  bitor_assign (&  mut  self ,  other :  Wrapping <$t >){*  self = *  self |  other ; }} forward_ref_op_assign ! { impl  BitOrAssign ,  bitor_assign  for  Wrapping <$t >,  Wrapping <$t > }# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  BitAnd  for  Wrapping <$t > { type  Output =  Wrapping <$t >; # [ inline ] fn  bitand ( self ,  other :  Wrapping <$t >)->  Wrapping <$t > { Wrapping ( self .  0 &  other .  0 )}} forward_ref_binop ! { impl  BitAnd ,  bitand  for  Wrapping <$t >,  Wrapping <$t >, # [ stable ( feature =  "wrapping_ref" ,  since =  "1.14.0" )]}# [ stable ( feature =  "op_assign_traits" ,  since =  "1.8.0" )] impl  BitAndAssign  for  Wrapping <$t > {# [ inline ] fn  bitand_assign (&  mut  self ,  other :  Wrapping <$t >){*  self = *  self &  other ; }} forward_ref_op_assign ! { impl  BitAndAssign ,  bitand_assign  for  Wrapping <$t >,  Wrapping <$t > }# [ stable ( feature =  "wrapping_neg" ,  since =  "1.10.0" )] impl  Neg  for  Wrapping <$t > { type  Output =  Self ; # [ inline ] fn  neg ( self )->  Self { Wrapping ( 0 )-  self }} forward_ref_unop ! { impl  Neg ,  neg  for  Wrapping <$t >, # [ stable ( feature =  "wrapping_ref" ,  since =  "1.14.0" )]})*)}
+macro_rules! __ra_macro_fixture8 {($($t :  ty )*)=>($(impl  Wrapping <$t > { doc_comment ! { concat ! ( "Returns the smallest value that can be represented by this integer type.\n\n# Examples\n\nBasic usage:\n\n```\n#![feature(wrapping_int_impl)]\nuse std::num::Wrapping;\n\nassert_eq!(<Wrapping<" ,  stringify ! ($t ),  ">>::MIN, Wrapping(" ,  stringify ! ($t ),  "::MIN));\n```" ), # [ unstable ( feature =  "wrapping_int_impl" ,  issue =  "32463" )] pub  const  MIN :  Self =  Self (<$t >::  MIN ); } doc_comment ! { concat ! ( "Returns the largest value that can be represented by this integer type.\n\n# Examples\n\nBasic usage:\n\n```\n#![feature(wrapping_int_impl)]\nuse std::num::Wrapping;\n\nassert_eq!(<Wrapping<" ,  stringify ! ($t ),  ">>::MAX, Wrapping(" ,  stringify ! ($t ),  "::MAX));\n```" ), # [ unstable ( feature =  "wrapping_int_impl" ,  issue =  "32463" )] pub  const  MAX :  Self =  Self (<$t >::  MAX ); } doc_comment ! { concat ! ( "Returns the number of ones in the binary representation of `self`.\n\n# Examples\n\nBasic usage:\n\n```\n#![feature(wrapping_int_impl)]\nuse std::num::Wrapping;\n\nlet n = Wrapping(0b01001100" ,  stringify ! ($t ),  ");\n\nassert_eq!(n.count_ones(), 3);\n```" ), # [ inline ]# [ unstable ( feature =  "wrapping_int_impl" ,  issue =  "32463" )] pub  const  fn  count_ones ( self )->  u32 { self .  0 .  count_ones ()}} doc_comment ! { concat ! ( "Returns the number of zeros in the binary representation of `self`.\n\n# Examples\n\nBasic usage:\n\n```\n#![feature(wrapping_int_impl)]\nuse std::num::Wrapping;\n\nassert_eq!(Wrapping(!0" ,  stringify ! ($t ),  ").count_zeros(), 0);\n```" ), # [ inline ]# [ unstable ( feature =  "wrapping_int_impl" ,  issue =  "32463" )] pub  const  fn  count_zeros ( self )->  u32 { self .  0 .  count_zeros ()}} doc_comment ! { concat ! ( "Returns the number of trailing zeros in the binary representation\nof `self`.\n\n# Examples\n\nBasic usage:\n\n```\n#![feature(wrapping_int_impl)]\nuse std::num::Wrapping;\n\nlet n = Wrapping(0b0101000" ,  stringify ! ($t ),  ");\n\nassert_eq!(n.trailing_zeros(), 3);\n```" ), # [ inline ]# [ unstable ( feature =  "wrapping_int_impl" ,  issue =  "32463" )] pub  const  fn  trailing_zeros ( self )->  u32 { self .  0 .  trailing_zeros ()}}# [ doc =  " Shifts the bits to the left by a specified amount, `n`," ]# [ doc =  " wrapping the truncated bits to the end of the resulting" ]# [ doc =  " integer." ]# [ doc =  "" ]# [ doc =  " Please note this isn\\\'t the same operation as the `<<` shifting" ]# [ doc =  " operator!" ]# [ doc =  "" ]# [ doc =  " # Examples" ]# [ doc =  "" ]# [ doc =  " Basic usage:" ]# [ doc =  "" ]# [ doc =  " ```" ]# [ doc =  " #![feature(wrapping_int_impl)]" ]# [ doc =  " use std::num::Wrapping;" ]# [ doc =  "" ]# [ doc =  " let n: Wrapping<i64> = Wrapping(0x0123456789ABCDEF);" ]# [ doc =  " let m: Wrapping<i64> = Wrapping(-0x76543210FEDCBA99);" ]# [ doc =  "" ]# [ doc =  " assert_eq!(n.rotate_left(32), m);" ]# [ doc =  " ```" ]# [ inline ]# [ unstable ( feature =  "wrapping_int_impl" ,  issue =  "32463" )] pub  const  fn  rotate_left ( self ,  n :  u32 )->  Self { Wrapping ( self .  0 .  rotate_left ( n ))}# [ doc =  " Shifts the bits to the right by a specified amount, `n`," ]# [ doc =  " wrapping the truncated bits to the beginning of the resulting" ]# [ doc =  " integer." ]# [ doc =  "" ]# [ doc =  " Please note this isn\\\'t the same operation as the `>>` shifting" ]# [ doc =  " operator!" ]# [ doc =  "" ]# [ doc =  " # Examples" ]# [ doc =  "" ]# [ doc =  " Basic usage:" ]# [ doc =  "" ]# [ doc =  " ```" ]# [ doc =  " #![feature(wrapping_int_impl)]" ]# [ doc =  " use std::num::Wrapping;" ]# [ doc =  "" ]# [ doc =  " let n: Wrapping<i64> = Wrapping(0x0123456789ABCDEF);" ]# [ doc =  " let m: Wrapping<i64> = Wrapping(-0xFEDCBA987654322);" ]# [ doc =  "" ]# [ doc =  " assert_eq!(n.rotate_right(4), m);" ]# [ doc =  " ```" ]# [ inline ]# [ unstable ( feature =  "wrapping_int_impl" ,  issue =  "32463" )] pub  const  fn  rotate_right ( self ,  n :  u32 )->  Self { Wrapping ( self .  0 .  rotate_right ( n ))}# [ doc =  " Reverses the byte order of the integer." ]# [ doc =  "" ]# [ doc =  " # Examples" ]# [ doc =  "" ]# [ doc =  " Basic usage:" ]# [ doc =  "" ]# [ doc =  " ```" ]# [ doc =  " #![feature(wrapping_int_impl)]" ]# [ doc =  " use std::num::Wrapping;" ]# [ doc =  "" ]# [ doc =  " let n: Wrapping<i16> = Wrapping(0b0000000_01010101);" ]# [ doc =  " assert_eq!(n, Wrapping(85));" ]# [ doc =  "" ]# [ doc =  " let m = n.swap_bytes();" ]# [ doc =  "" ]# [ doc =  " assert_eq!(m, Wrapping(0b01010101_00000000));" ]# [ doc =  " assert_eq!(m, Wrapping(21760));" ]# [ doc =  " ```" ]# [ inline ]# [ unstable ( feature =  "wrapping_int_impl" ,  issue =  "32463" )] pub  const  fn  swap_bytes ( self )->  Self { Wrapping ( self .  0 .  swap_bytes ())}# [ doc =  " Reverses the bit pattern of the integer." ]# [ doc =  "" ]# [ doc =  " # Examples" ]# [ doc =  "" ]# [ doc =  " Please note that this example is shared between integer types." ]# [ doc =  " Which explains why `i16` is used here." ]# [ doc =  "" ]# [ doc =  " Basic usage:" ]# [ doc =  "" ]# [ doc =  " ```" ]# [ doc =  " use std::num::Wrapping;" ]# [ doc =  "" ]# [ doc =  " let n = Wrapping(0b0000000_01010101i16);" ]# [ doc =  " assert_eq!(n, Wrapping(85));" ]# [ doc =  "" ]# [ doc =  " let m = n.reverse_bits();" ]# [ doc =  "" ]# [ doc =  " assert_eq!(m.0 as u16, 0b10101010_00000000);" ]# [ doc =  " assert_eq!(m, Wrapping(-22016));" ]# [ doc =  " ```" ]# [ stable ( feature =  "reverse_bits" ,  since =  "1.37.0" )]# [ rustc_const_stable ( feature =  "const_reverse_bits" ,  since =  "1.37.0" )]# [ inline ]# [ must_use ] pub  const  fn  reverse_bits ( self )->  Self { Wrapping ( self .  0 .  reverse_bits ())} doc_comment ! { concat ! ( "Converts an integer from big endian to the target's endianness.\n\nOn big endian this is a no-op. On little endian the bytes are\nswapped.\n\n# Examples\n\nBasic usage:\n\n```\n#![feature(wrapping_int_impl)]\nuse std::num::Wrapping;\n\nlet n = Wrapping(0x1A" ,  stringify ! ($t ),  ");\n\nif cfg!(target_endian = \"big\") {\n    assert_eq!(<Wrapping<" ,  stringify ! ($t ),  ">>::from_be(n), n)\n} else {\n    assert_eq!(<Wrapping<" ,  stringify ! ($t ),  ">>::from_be(n), n.swap_bytes())\n}\n```" ), # [ inline ]# [ unstable ( feature =  "wrapping_int_impl" ,  issue =  "32463" )] pub  const  fn  from_be ( x :  Self )->  Self { Wrapping (<$t >::  from_be ( x .  0 ))}} doc_comment ! { concat ! ( "Converts an integer from little endian to the target's endianness.\n\nOn little endian this is a no-op. On big endian the bytes are\nswapped.\n\n# Examples\n\nBasic usage:\n\n```\n#![feature(wrapping_int_impl)]\nuse std::num::Wrapping;\n\nlet n = Wrapping(0x1A" ,  stringify ! ($t ),  ");\n\nif cfg!(target_endian = \"little\") {\n    assert_eq!(<Wrapping<" ,  stringify ! ($t ),  ">>::from_le(n), n)\n} else {\n    assert_eq!(<Wrapping<" ,  stringify ! ($t ),  ">>::from_le(n), n.swap_bytes())\n}\n```" ), # [ inline ]# [ unstable ( feature =  "wrapping_int_impl" ,  issue =  "32463" )] pub  const  fn  from_le ( x :  Self )->  Self { Wrapping (<$t >::  from_le ( x .  0 ))}} doc_comment ! { concat ! ( "Converts `self` to big endian from the target's endianness.\n\nOn big endian this is a no-op. On little endian the bytes are\nswapped.\n\n# Examples\n\nBasic usage:\n\n```\n#![feature(wrapping_int_impl)]\nuse std::num::Wrapping;\n\nlet n = Wrapping(0x1A" ,  stringify ! ($t ),  ");\n\nif cfg!(target_endian = \"big\") {\n    assert_eq!(n.to_be(), n)\n} else {\n    assert_eq!(n.to_be(), n.swap_bytes())\n}\n```" ), # [ inline ]# [ unstable ( feature =  "wrapping_int_impl" ,  issue =  "32463" )] pub  const  fn  to_be ( self )->  Self { Wrapping ( self .  0 .  to_be ())}} doc_comment ! { concat ! ( "Converts `self` to little endian from the target's endianness.\n\nOn little endian this is a no-op. On big endian the bytes are\nswapped.\n\n# Examples\n\nBasic usage:\n\n```\n#![feature(wrapping_int_impl)]\nuse std::num::Wrapping;\n\nlet n = Wrapping(0x1A" ,  stringify ! ($t ),  ");\n\nif cfg!(target_endian = \"little\") {\n    assert_eq!(n.to_le(), n)\n} else {\n    assert_eq!(n.to_le(), n.swap_bytes())\n}\n```" ), # [ inline ]# [ unstable ( feature =  "wrapping_int_impl" ,  issue =  "32463" )] pub  const  fn  to_le ( self )->  Self { Wrapping ( self .  0 .  to_le ())}} doc_comment ! { concat ! ( "Raises self to the power of `exp`, using exponentiation by squaring.\n\n# Examples\n\nBasic usage:\n\n```\n#![feature(wrapping_int_impl)]\nuse std::num::Wrapping;\n\nassert_eq!(Wrapping(3" ,  stringify ! ($t ),  ").pow(4), Wrapping(81));\n```\n\nResults that are too large are wrapped:\n\n```\n#![feature(wrapping_int_impl)]\nuse std::num::Wrapping;\n\nassert_eq!(Wrapping(3i8).pow(5), Wrapping(-13));\nassert_eq!(Wrapping(3i8).pow(6), Wrapping(-39));\n```" ), # [ inline ]# [ unstable ( feature =  "wrapping_int_impl" ,  issue =  "32463" )] pub  fn  pow ( self ,  exp :  u32 )->  Self { Wrapping ( self .  0 .  wrapping_pow ( exp ))}}})*)}
+macro_rules! __ra_macro_fixture9 {($($t :  ty )*)=>($(impl  Wrapping <$t > { doc_comment ! { concat ! ( "Returns the number of leading zeros in the binary representation of `self`.\n\n# Examples\n\nBasic usage:\n\n```\n#![feature(wrapping_int_impl)]\nuse std::num::Wrapping;\n\nlet n = Wrapping(" ,  stringify ! ($t ),  "::MAX) >> 2;\n\nassert_eq!(n.leading_zeros(), 3);\n```" ), # [ inline ]# [ unstable ( feature =  "wrapping_int_impl" ,  issue =  "32463" )] pub  const  fn  leading_zeros ( self )->  u32 { self .  0 .  leading_zeros ()}} doc_comment ! { concat ! ( "Computes the absolute value of `self`, wrapping around at\nthe boundary of the type.\n\nThe only case where such wrapping can occur is when one takes the absolute value of the negative\nminimal value for the type this is a positive value that is too large to represent in the type. In\nsuch a case, this function returns `MIN` itself.\n\n# Examples\n\nBasic usage:\n\n```\n#![feature(wrapping_int_impl)]\nuse std::num::Wrapping;\n\nassert_eq!(Wrapping(100" ,  stringify ! ($t ),  ").abs(), Wrapping(100));\nassert_eq!(Wrapping(-100" ,  stringify ! ($t ),  ").abs(), Wrapping(100));\nassert_eq!(Wrapping(" ,  stringify ! ($t ),  "::MIN).abs(), Wrapping(" ,  stringify ! ($t ),  "::MIN));\nassert_eq!(Wrapping(-128i8).abs().0 as u8, 128u8);\n```" ), # [ inline ]# [ unstable ( feature =  "wrapping_int_impl" ,  issue =  "32463" )] pub  fn  abs ( self )->  Wrapping <$t > { Wrapping ( self .  0 .  wrapping_abs ())}} doc_comment ! { concat ! ( "Returns a number representing sign of `self`.\n\n - `0` if the number is zero\n - `1` if the number is positive\n - `-1` if the number is negative\n\n# Examples\n\nBasic usage:\n\n```\n#![feature(wrapping_int_impl)]\nuse std::num::Wrapping;\n\nassert_eq!(Wrapping(10" ,  stringify ! ($t ),  ").signum(), Wrapping(1));\nassert_eq!(Wrapping(0" ,  stringify ! ($t ),  ").signum(), Wrapping(0));\nassert_eq!(Wrapping(-10" ,  stringify ! ($t ),  ").signum(), Wrapping(-1));\n```" ), # [ inline ]# [ unstable ( feature =  "wrapping_int_impl" ,  issue =  "32463" )] pub  fn  signum ( self )->  Wrapping <$t > { Wrapping ( self .  0 .  signum ())}} doc_comment ! { concat ! ( "Returns `true` if `self` is positive and `false` if the number is zero or\nnegative.\n\n# Examples\n\nBasic usage:\n\n```\n#![feature(wrapping_int_impl)]\nuse std::num::Wrapping;\n\nassert!(Wrapping(10" ,  stringify ! ($t ),  ").is_positive());\nassert!(!Wrapping(-10" ,  stringify ! ($t ),  ").is_positive());\n```" ), # [ inline ]# [ unstable ( feature =  "wrapping_int_impl" ,  issue =  "32463" )] pub  const  fn  is_positive ( self )->  bool { self .  0 .  is_positive ()}} doc_comment ! { concat ! ( "Returns `true` if `self` is negative and `false` if the number is zero or\npositive.\n\n# Examples\n\nBasic usage:\n\n```\n#![feature(wrapping_int_impl)]\nuse std::num::Wrapping;\n\nassert!(Wrapping(-10" ,  stringify ! ($t ),  ").is_negative());\nassert!(!Wrapping(10" ,  stringify ! ($t ),  ").is_negative());\n```" ), # [ inline ]# [ unstable ( feature =  "wrapping_int_impl" ,  issue =  "32463" )] pub  const  fn  is_negative ( self )->  bool { self .  0 .  is_negative ()}}})*)}
+macro_rules! __ra_macro_fixture10 {($($t :  ty )*)=>($(impl  Wrapping <$t > { doc_comment ! { concat ! ( "Returns the number of leading zeros in the binary representation of `self`.\n\n# Examples\n\nBasic usage:\n\n```\n#![feature(wrapping_int_impl)]\nuse std::num::Wrapping;\n\nlet n = Wrapping(" ,  stringify ! ($t ),  "::MAX) >> 2;\n\nassert_eq!(n.leading_zeros(), 2);\n```" ), # [ inline ]# [ unstable ( feature =  "wrapping_int_impl" ,  issue =  "32463" )] pub  const  fn  leading_zeros ( self )->  u32 { self .  0 .  leading_zeros ()}} doc_comment ! { concat ! ( "Returns `true` if and only if `self == 2^k` for some `k`.\n\n# Examples\n\nBasic usage:\n\n```\n#![feature(wrapping_int_impl)]\nuse std::num::Wrapping;\n\nassert!(Wrapping(16" ,  stringify ! ($t ),  ").is_power_of_two());\nassert!(!Wrapping(10" ,  stringify ! ($t ),  ").is_power_of_two());\n```" ), # [ inline ]# [ unstable ( feature =  "wrapping_int_impl" ,  issue =  "32463" )] pub  fn  is_power_of_two ( self )->  bool { self .  0 .  is_power_of_two ()}} doc_comment ! { concat ! ( "Returns the smallest power of two greater than or equal to `self`.\n\nWhen return value overflows (i.e., `self > (1 << (N-1))` for type\n`uN`), overflows to `2^N = 0`.\n\n# Examples\n\nBasic usage:\n\n```\n#![feature(wrapping_next_power_of_two)]\nuse std::num::Wrapping;\n\nassert_eq!(Wrapping(2" ,  stringify ! ($t ),  ").next_power_of_two(), Wrapping(2));\nassert_eq!(Wrapping(3" ,  stringify ! ($t ),  ").next_power_of_two(), Wrapping(4));\nassert_eq!(Wrapping(200_u8).next_power_of_two(), Wrapping(0));\n```" ), # [ inline ]# [ unstable ( feature =  "wrapping_next_power_of_two" ,  issue =  "32463" ,  reason =  "needs decision on wrapping behaviour" )] pub  fn  next_power_of_two ( self )->  Self { Wrapping ( self .  0 .  wrapping_next_power_of_two ())}}})*)}
+macro_rules! __ra_macro_fixture11 {($($t :  ty )*)=>{$(# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  FromStr  for $t { type  Err =  ParseIntError ;  fn  from_str ( src : &  str )->  Result <  Self ,  ParseIntError > { from_str_radix ( src ,  10 )}})*}}
+macro_rules! __ra_macro_fixture12 {($($t :  ty )*)=>($(impl  FromStrRadixHelper  for $t {# [ inline ] fn  min_value ()->  Self { Self ::  MIN }# [ inline ] fn  max_value ()->  Self { Self ::  MAX }# [ inline ] fn  from_u32 ( u :  u32 )->  Self { u  as  Self }# [ inline ] fn  checked_mul (&  self ,  other :  u32 )->  Option <  Self > { Self ::  checked_mul (*  self ,  other  as  Self )}# [ inline ] fn  checked_sub (&  self ,  other :  u32 )->  Option <  Self > { Self ::  checked_sub (*  self ,  other  as  Self )}# [ inline ] fn  checked_add (&  self ,  other :  u32 )->  Option <  Self > { Self ::  checked_add (*  self ,  other  as  Self )}})*)}
+macro_rules! __ra_macro_fixture13 {($($Arg :  ident ),+)=>{ fnptr_impls_safety_abi ! { extern  "Rust"  fn ($($Arg ),+)->  Ret , $($Arg ),+ } fnptr_impls_safety_abi ! { extern  "C"  fn ($($Arg ),+)->  Ret , $($Arg ),+ } fnptr_impls_safety_abi ! { extern  "C"  fn ($($Arg ),+ , ...)->  Ret , $($Arg ),+ } fnptr_impls_safety_abi ! { unsafe  extern  "Rust"  fn ($($Arg ),+)->  Ret , $($Arg ),+ } fnptr_impls_safety_abi ! { unsafe  extern  "C"  fn ($($Arg ),+)->  Ret , $($Arg ),+ } fnptr_impls_safety_abi ! { unsafe  extern  "C"  fn ($($Arg ),+ , ...)->  Ret , $($Arg ),+ }}; ()=>{ fnptr_impls_safety_abi ! { extern  "Rust"  fn ()->  Ret , } fnptr_impls_safety_abi ! { extern  "C"  fn ()->  Ret , } fnptr_impls_safety_abi ! { unsafe  extern  "Rust"  fn ()->  Ret , } fnptr_impls_safety_abi ! { unsafe  extern  "C"  fn ()->  Ret , }}; }
+macro_rules! __ra_macro_fixture14 {($($t :  ty )*)=>{$(# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  Clone  for $t {# [ inline ] fn  clone (&  self )->  Self {*  self }})* }}
+macro_rules! __ra_macro_fixture15 {($($t :  ty )*)=>($(# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  PartialEq  for $t {# [ inline ] fn  eq (&  self ,  other : &$t )->  bool {(*  self )== (*  other )}# [ inline ] fn  ne (&  self ,  other : &$t )->  bool {(*  self )!= (*  other )}})*)}
+macro_rules! __ra_macro_fixture16 {($($t :  ty )*)=>($(# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  Eq  for $t {})*)}
+macro_rules! __ra_macro_fixture17 {($($t :  ty )*)=>($(# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  PartialOrd  for $t {# [ inline ] fn  partial_cmp (&  self ,  other : &$t )->  Option <  Ordering > { match ( self <=  other ,  self >=  other ){( false ,  false )=> None , ( false ,  true )=> Some ( Greater ), ( true ,  false )=> Some ( Less ), ( true ,  true )=> Some ( Equal ), }}# [ inline ] fn  lt (&  self ,  other : &$t )->  bool {(*  self )< (*  other )}# [ inline ] fn  le (&  self ,  other : &$t )->  bool {(*  self )<= (*  other )}# [ inline ] fn  ge (&  self ,  other : &$t )->  bool {(*  self )>= (*  other )}# [ inline ] fn  gt (&  self ,  other : &$t )->  bool {(*  self )> (*  other )}})*)}
+macro_rules! __ra_macro_fixture18 {($($t :  ty )*)=>($(# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  PartialOrd  for $t {# [ inline ] fn  partial_cmp (&  self ,  other : &$t )->  Option <  Ordering > { Some ( self .  cmp ( other ))}# [ inline ] fn  lt (&  self ,  other : &$t )->  bool {(*  self )< (*  other )}# [ inline ] fn  le (&  self ,  other : &$t )->  bool {(*  self )<= (*  other )}# [ inline ] fn  ge (&  self ,  other : &$t )->  bool {(*  self )>= (*  other )}# [ inline ] fn  gt (&  self ,  other : &$t )->  bool {(*  self )> (*  other )}}# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  Ord  for $t {# [ inline ] fn  cmp (&  self ,  other : &$t )->  Ordering { if *  self < *  other { Less } else  if *  self == *  other { Equal } else { Greater }}})*)}
+macro_rules! __ra_macro_fixture19 {($Float :  ident =>$($Int :  ident )+ )=>{# [ unstable ( feature =  "convert_float_to_int" ,  issue =  "67057" )] impl  private ::  Sealed  for $Float {}$(# [ unstable ( feature =  "convert_float_to_int" ,  issue =  "67057" )] impl  FloatToInt <$Int >  for $Float {# [ doc ( hidden )]# [ inline ] unsafe  fn  to_int_unchecked ( self )-> $Int { unsafe { crate ::  intrinsics ::  float_to_int_unchecked ( self )}}})+ }}
+macro_rules! __ra_macro_fixture20 {($target :  ty , # [$attr :  meta ])=>{ impl_from ! ( bool , $target , # [$attr ],  concat ! ( "Converts a `bool` to a `" ,  stringify ! ($target ),  "`. The resulting value is `0` for `false` and `1` for `true`\nvalues.\n\n# Examples\n\n```\nassert_eq!(" ,  stringify ! ($target ),  "::from(true), 1);\nassert_eq!(" ,  stringify ! ($target ),  "::from(false), 0);\n```" )); }; }
+macro_rules! __ra_macro_fixture21 {($Small :  ty , $Large :  ty , # [$attr :  meta ], $doc :  expr )=>{# [$attr ]# [ doc = $doc ] impl  From <$Small >  for $Large {# [ inline ] fn  from ( small : $Small )->  Self { small  as  Self }}}; ($Small :  ty , $Large :  ty , # [$attr :  meta ])=>{ impl_from ! ($Small , $Large , # [$attr ],  concat ! ( "Converts `" ,  stringify ! ($Small ),  "` to `" ,  stringify ! ($Large ),  "` losslessly." )); }}
+macro_rules! __ra_macro_fixture22 {($source :  ty , $($target :  ty ),*)=>{$(# [ stable ( feature =  "try_from" ,  since =  "1.34.0" )] impl  TryFrom <$source >  for $target { type  Error =  TryFromIntError ; # [ doc =  " Try to create the target number type from a source" ]# [ doc =  " number type. This returns an error if the source value" ]# [ doc =  " is outside of the range of the target type." ]# [ inline ] fn  try_from ( u : $source )->  Result <  Self ,  Self ::  Error > { if  u > ( Self ::  MAX  as $source ){ Err ( TryFromIntError (()))} else { Ok ( u  as  Self )}}})*}}
+macro_rules! __ra_macro_fixture23 {($source :  ty , $($target :  ty ),*)=>{$(# [ stable ( feature =  "try_from" ,  since =  "1.34.0" )] impl  TryFrom <$source >  for $target { type  Error =  TryFromIntError ; # [ doc =  " Try to create the target number type from a source" ]# [ doc =  " number type. This returns an error if the source value" ]# [ doc =  " is outside of the range of the target type." ]# [ inline ] fn  try_from ( u : $source )->  Result <  Self ,  Self ::  Error > { let  min =  Self ::  MIN  as $source ;  let  max =  Self ::  MAX  as $source ;  if  u <  min ||  u >  max { Err ( TryFromIntError (()))} else { Ok ( u  as  Self )}}})*}}
+macro_rules! __ra_macro_fixture24 {($source :  ty , $($target :  ty ),*)=>{$(# [ stable ( feature =  "try_from" ,  since =  "1.34.0" )] impl  TryFrom <$source >  for $target { type  Error =  TryFromIntError ; # [ doc =  " Try to create the target number type from a source" ]# [ doc =  " number type. This returns an error if the source value" ]# [ doc =  " is outside of the range of the target type." ]# [ inline ] fn  try_from ( u : $source )->  Result <  Self ,  Self ::  Error > { if  u >=  0 { Ok ( u  as  Self )} else { Err ( TryFromIntError (()))}}})*}}
+macro_rules! __ra_macro_fixture25 {($source :  ty , $($target :  ty ),*)=>{$(# [ stable ( feature =  "try_from" ,  since =  "1.34.0" )] impl  TryFrom <$source >  for $target { type  Error =  TryFromIntError ; # [ doc =  " Try to create the target number type from a source" ]# [ doc =  " number type. This returns an error if the source value" ]# [ doc =  " is outside of the range of the target type." ]# [ inline ] fn  try_from ( value : $source )->  Result <  Self ,  Self ::  Error > { Ok ( value  as  Self )}})*}}
+macro_rules! __ra_macro_fixture26 {($mac :  ident , $source :  ty , $($target :  ty ),*)=>{$($mac ! ($target , $source ); )*}}
+macro_rules! __ra_macro_fixture27 {($Small :  ty , $Large :  ty , # [$attr :  meta ], $doc :  expr )=>{# [$attr ]# [ doc = $doc ] impl  From <$Small >  for $Large {# [ inline ] fn  from ( small : $Small )->  Self { unsafe { Self ::  new_unchecked ( small .  get ().  into ())}}}}; ($Small :  ty , $Large :  ty , # [$attr :  meta ])=>{ nzint_impl_from ! ($Small , $Large , # [$attr ],  concat ! ( "Converts `" ,  stringify ! ($Small ),  "` to `" ,  stringify ! ($Large ),  "` losslessly." )); }}
+macro_rules! __ra_macro_fixture28 {($Int :  ty , $NonZeroInt :  ty , # [$attr :  meta ], $doc :  expr )=>{# [$attr ]# [ doc = $doc ] impl  TryFrom <$Int >  for $NonZeroInt { type  Error =  TryFromIntError ; # [ inline ] fn  try_from ( value : $Int )->  Result <  Self ,  Self ::  Error > { Self ::  new ( value ).  ok_or ( TryFromIntError (()))}}}; ($Int :  ty , $NonZeroInt :  ty , # [$attr :  meta ])=>{ nzint_impl_try_from_int ! ($Int , $NonZeroInt , # [$attr ],  concat ! ( "Attempts to convert `" ,  stringify ! ($Int ),  "` to `" ,  stringify ! ($NonZeroInt ),  "`." )); }}
+macro_rules! __ra_macro_fixture29 {($From :  ty =>$To :  ty , $doc :  expr )=>{# [ stable ( feature =  "nzint_try_from_nzint_conv" ,  since =  "1.49.0" )]# [ doc = $doc ] impl  TryFrom <$From >  for $To { type  Error =  TryFromIntError ; # [ inline ] fn  try_from ( value : $From )->  Result <  Self ,  Self ::  Error > { TryFrom ::  try_from ( value .  get ()).  map (|  v | { unsafe { Self ::  new_unchecked ( v )}})}}}; ($To :  ty : $($From :  ty ),*)=>{$(nzint_impl_try_from_nzint ! ($From =>$To ,  concat ! ( "Attempts to convert `" ,  stringify ! ($From ),  "` to `" ,  stringify ! ($To ),  "`." , )); )*}; }
+macro_rules! __ra_macro_fixture30 {($t :  ty , $v :  expr , $doc :  tt )=>{# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  Default  for $t {# [ inline ]# [ doc = $doc ] fn  default ()-> $t {$v }}}}
+macro_rules! __ra_macro_fixture31 {($t :  ident )=>{# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl <  T : ?  Sized >  Hash  for $t <  T > {# [ inline ] fn  hash <  H :  Hasher > (&  self , _: &  mut  H ){}}# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl <  T : ?  Sized >  cmp ::  PartialEq  for $t <  T > { fn  eq (&  self ,  _other : &$t <  T >)->  bool { true }}# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl <  T : ?  Sized >  cmp ::  Eq  for $t <  T > {}# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl <  T : ?  Sized >  cmp ::  PartialOrd  for $t <  T > { fn  partial_cmp (&  self ,  _other : &$t <  T >)->  Option <  cmp ::  Ordering > { Option ::  Some ( cmp ::  Ordering ::  Equal )}}# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl <  T : ?  Sized >  cmp ::  Ord  for $t <  T > { fn  cmp (&  self ,  _other : &$t <  T >)->  cmp ::  Ordering { cmp ::  Ordering ::  Equal }}# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl <  T : ?  Sized >  Copy  for $t <  T > {}# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl <  T : ?  Sized >  Clone  for $t <  T > { fn  clone (&  self )->  Self { Self }}# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl <  T : ?  Sized >  Default  for $t <  T > { fn  default ()->  Self { Self }}# [ unstable ( feature =  "structural_match" ,  issue =  "31434" )] impl <  T : ?  Sized >  StructuralPartialEq  for $t <  T > {}# [ unstable ( feature =  "structural_match" ,  issue =  "31434" )] impl <  T : ?  Sized >  StructuralEq  for $t <  T > {}}; }
+macro_rules! __ra_macro_fixture32 {($($t :  ty )*)=>{$(# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  Copy  for $t {})* }}
+macro_rules! __ra_macro_fixture33 {($($t :  ty )*)=>($(# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  Add  for $t { type  Output = $t ; # [ inline ]# [ rustc_inherit_overflow_checks ] fn  add ( self ,  other : $t )-> $t { self +  other }} forward_ref_binop ! { impl  Add ,  add  for $t , $t })*)}
+macro_rules! __ra_macro_fixture34 {($($t :  ty )*)=>($(# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  Sub  for $t { type  Output = $t ; # [ inline ]# [ rustc_inherit_overflow_checks ] fn  sub ( self ,  other : $t )-> $t { self -  other }} forward_ref_binop ! { impl  Sub ,  sub  for $t , $t })*)}
+macro_rules! __ra_macro_fixture35 {($($t :  ty )*)=>($(# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  Mul  for $t { type  Output = $t ; # [ inline ]# [ rustc_inherit_overflow_checks ] fn  mul ( self ,  other : $t )-> $t { self *  other }} forward_ref_binop ! { impl  Mul ,  mul  for $t , $t })*)}
+macro_rules! __ra_macro_fixture36 {($($t :  ty )*)=>($(# [ doc =  " This operation rounds towards zero, truncating any" ]# [ doc =  " fractional part of the exact result." ]# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  Div  for $t { type  Output = $t ; # [ inline ] fn  div ( self ,  other : $t )-> $t { self /  other }} forward_ref_binop ! { impl  Div ,  div  for $t , $t })*)}
+macro_rules! __ra_macro_fixture37 {($($t :  ty )*)=>($(# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  Div  for $t { type  Output = $t ; # [ inline ] fn  div ( self ,  other : $t )-> $t { self /  other }} forward_ref_binop ! { impl  Div ,  div  for $t , $t })*)}
+macro_rules! __ra_macro_fixture38 {($($t :  ty )*)=>($(# [ doc =  " This operation satisfies `n % d == n - (n / d) * d`. The" ]# [ doc =  " result has the same sign as the left operand." ]# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  Rem  for $t { type  Output = $t ; # [ inline ] fn  rem ( self ,  other : $t )-> $t { self %  other }} forward_ref_binop ! { impl  Rem ,  rem  for $t , $t })*)}
+macro_rules! __ra_macro_fixture39 {($($t :  ty )*)=>($(# [ doc =  " The remainder from the division of two floats." ]# [ doc =  "" ]# [ doc =  " The remainder has the same sign as the dividend and is computed as:" ]# [ doc =  " `x - (x / y).trunc() * y`." ]# [ doc =  "" ]# [ doc =  " # Examples" ]# [ doc =  " ```" ]# [ doc =  " let x: f32 = 50.50;" ]# [ doc =  " let y: f32 = 8.125;" ]# [ doc =  " let remainder = x - (x / y).trunc() * y;" ]# [ doc =  "" ]# [ doc =  " // The answer to both operations is 1.75" ]# [ doc =  " assert_eq!(x % y, remainder);" ]# [ doc =  " ```" ]# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  Rem  for $t { type  Output = $t ; # [ inline ] fn  rem ( self ,  other : $t )-> $t { self %  other }} forward_ref_binop ! { impl  Rem ,  rem  for $t , $t })*)}
+macro_rules! __ra_macro_fixture40 {($($t :  ty )*)=>($(# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  Neg  for $t { type  Output = $t ; # [ inline ]# [ rustc_inherit_overflow_checks ] fn  neg ( self )-> $t {-  self }} forward_ref_unop ! { impl  Neg ,  neg  for $t })*)}
+macro_rules! __ra_macro_fixture41 {($($t :  ty )+)=>($(# [ stable ( feature =  "op_assign_traits" ,  since =  "1.8.0" )] impl  AddAssign  for $t {# [ inline ]# [ rustc_inherit_overflow_checks ] fn  add_assign (&  mut  self ,  other : $t ){*  self +=  other }} forward_ref_op_assign ! { impl  AddAssign ,  add_assign  for $t , $t })+)}
+macro_rules! __ra_macro_fixture42 {($($t :  ty )+)=>($(# [ stable ( feature =  "op_assign_traits" ,  since =  "1.8.0" )] impl  SubAssign  for $t {# [ inline ]# [ rustc_inherit_overflow_checks ] fn  sub_assign (&  mut  self ,  other : $t ){*  self -=  other }} forward_ref_op_assign ! { impl  SubAssign ,  sub_assign  for $t , $t })+)}
+macro_rules! __ra_macro_fixture43 {($($t :  ty )+)=>($(# [ stable ( feature =  "op_assign_traits" ,  since =  "1.8.0" )] impl  MulAssign  for $t {# [ inline ]# [ rustc_inherit_overflow_checks ] fn  mul_assign (&  mut  self ,  other : $t ){*  self *=  other }} forward_ref_op_assign ! { impl  MulAssign ,  mul_assign  for $t , $t })+)}
+macro_rules! __ra_macro_fixture44 {($($t :  ty )+)=>($(# [ stable ( feature =  "op_assign_traits" ,  since =  "1.8.0" )] impl  DivAssign  for $t {# [ inline ] fn  div_assign (&  mut  self ,  other : $t ){*  self /=  other }} forward_ref_op_assign ! { impl  DivAssign ,  div_assign  for $t , $t })+)}
+macro_rules! __ra_macro_fixture45 {($($t :  ty )+)=>($(# [ stable ( feature =  "op_assign_traits" ,  since =  "1.8.0" )] impl  RemAssign  for $t {# [ inline ] fn  rem_assign (&  mut  self ,  other : $t ){*  self %=  other }} forward_ref_op_assign ! { impl  RemAssign ,  rem_assign  for $t , $t })+)}
+macro_rules! __ra_macro_fixture46 {($($t :  ty )*)=>($(# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  Not  for $t { type  Output = $t ; # [ inline ] fn  not ( self )-> $t {!  self }} forward_ref_unop ! { impl  Not ,  not  for $t })*)}
+macro_rules! __ra_macro_fixture47 {($($t :  ty )*)=>($(# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  BitAnd  for $t { type  Output = $t ; # [ inline ] fn  bitand ( self ,  rhs : $t )-> $t { self &  rhs }} forward_ref_binop ! { impl  BitAnd ,  bitand  for $t , $t })*)}
+macro_rules! __ra_macro_fixture48 {($($t :  ty )*)=>($(# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  BitOr  for $t { type  Output = $t ; # [ inline ] fn  bitor ( self ,  rhs : $t )-> $t { self |  rhs }} forward_ref_binop ! { impl  BitOr ,  bitor  for $t , $t })*)}
+macro_rules! __ra_macro_fixture49 {($($t :  ty )*)=>($(# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  BitXor  for $t { type  Output = $t ; # [ inline ] fn  bitxor ( self ,  other : $t )-> $t { self ^  other }} forward_ref_binop ! { impl  BitXor ,  bitxor  for $t , $t })*)}
+macro_rules! __ra_macro_fixture50 {($($t :  ty )*)=>($(shl_impl ! {$t ,  u8 } shl_impl ! {$t ,  u16 } shl_impl ! {$t ,  u32 } shl_impl ! {$t ,  u64 } shl_impl ! {$t ,  u128 } shl_impl ! {$t ,  usize } shl_impl ! {$t ,  i8 } shl_impl ! {$t ,  i16 } shl_impl ! {$t ,  i32 } shl_impl ! {$t ,  i64 } shl_impl ! {$t ,  i128 } shl_impl ! {$t ,  isize })*)}
+macro_rules! __ra_macro_fixture51 {($($t :  ty )*)=>($(shr_impl ! {$t ,  u8 } shr_impl ! {$t ,  u16 } shr_impl ! {$t ,  u32 } shr_impl ! {$t ,  u64 } shr_impl ! {$t ,  u128 } shr_impl ! {$t ,  usize } shr_impl ! {$t ,  i8 } shr_impl ! {$t ,  i16 } shr_impl ! {$t ,  i32 } shr_impl ! {$t ,  i64 } shr_impl ! {$t ,  i128 } shr_impl ! {$t ,  isize })*)}
+macro_rules! __ra_macro_fixture52 {($($t :  ty )+)=>($(# [ stable ( feature =  "op_assign_traits" ,  since =  "1.8.0" )] impl  BitAndAssign  for $t {# [ inline ] fn  bitand_assign (&  mut  self ,  other : $t ){*  self &=  other }} forward_ref_op_assign ! { impl  BitAndAssign ,  bitand_assign  for $t , $t })+)}
+macro_rules! __ra_macro_fixture53 {($($t :  ty )+)=>($(# [ stable ( feature =  "op_assign_traits" ,  since =  "1.8.0" )] impl  BitOrAssign  for $t {# [ inline ] fn  bitor_assign (&  mut  self ,  other : $t ){*  self |=  other }} forward_ref_op_assign ! { impl  BitOrAssign ,  bitor_assign  for $t , $t })+)}
+macro_rules! __ra_macro_fixture54 {($($t :  ty )+)=>($(# [ stable ( feature =  "op_assign_traits" ,  since =  "1.8.0" )] impl  BitXorAssign  for $t {# [ inline ] fn  bitxor_assign (&  mut  self ,  other : $t ){*  self ^=  other }} forward_ref_op_assign ! { impl  BitXorAssign ,  bitxor_assign  for $t , $t })+)}
+macro_rules! __ra_macro_fixture55 {($($t :  ty )*)=>($(shl_assign_impl ! {$t ,  u8 } shl_assign_impl ! {$t ,  u16 } shl_assign_impl ! {$t ,  u32 } shl_assign_impl ! {$t ,  u64 } shl_assign_impl ! {$t ,  u128 } shl_assign_impl ! {$t ,  usize } shl_assign_impl ! {$t ,  i8 } shl_assign_impl ! {$t ,  i16 } shl_assign_impl ! {$t ,  i32 } shl_assign_impl ! {$t ,  i64 } shl_assign_impl ! {$t ,  i128 } shl_assign_impl ! {$t ,  isize })*)}
+macro_rules! __ra_macro_fixture56 {($($t :  ty )*)=>($(shr_assign_impl ! {$t ,  u8 } shr_assign_impl ! {$t ,  u16 } shr_assign_impl ! {$t ,  u32 } shr_assign_impl ! {$t ,  u64 } shr_assign_impl ! {$t ,  u128 } shr_assign_impl ! {$t ,  usize } shr_assign_impl ! {$t ,  i8 } shr_assign_impl ! {$t ,  i16 } shr_assign_impl ! {$t ,  i32 } shr_assign_impl ! {$t ,  i64 } shr_assign_impl ! {$t ,  i128 } shr_assign_impl ! {$t ,  isize })*)}
+macro_rules! __ra_macro_fixture57 {{$n :  expr , $t :  ident $($ts :  ident )*}=>{# [ stable ( since =  "1.4.0" ,  feature =  "array_default" )] impl <  T >  Default  for [ T ; $n ] where  T :  Default { fn  default ()-> [ T ; $n ]{[$t ::  default (), $($ts ::  default ()),*]}} array_impl_default ! {($n -  1 ), $($ts )*}}; {$n :  expr ,}=>{# [ stable ( since =  "1.4.0" ,  feature =  "array_default" )] impl <  T >  Default  for [ T ; $n ]{ fn  default ()-> [ T ; $n ]{[]}}}; }
+macro_rules! __ra_macro_fixture58 {($($t :  ty ),+)=>{$(# [ unstable ( feature =  "c_variadic" ,  reason =  "the `c_variadic` feature has not been properly tested on \\n                                 all supported platforms" ,  issue =  "44930" )] impl  sealed_trait ::  VaArgSafe  for $t {})+ }}
+macro_rules! __ra_macro_fixture59 {{ narrower  than  or  same  width  as  usize : $([$u_narrower :  ident $i_narrower :  ident ]),+;  wider  than  usize : $([$u_wider :  ident $i_wider :  ident ]),+; }=>{$(# [ allow ( unreachable_patterns )]# [ unstable ( feature =  "step_trait" ,  reason =  "recently redesigned" ,  issue =  "42168" )] unsafe  impl  Step  for $u_narrower { step_identical_methods ! (); # [ inline ] fn  steps_between ( start : &  Self ,  end : &  Self )->  Option <  usize > { if *  start <= *  end { Some ((*  end - *  start ) as  usize )} else { None }}# [ inline ] fn  forward_checked ( start :  Self ,  n :  usize )->  Option <  Self > { match  Self ::  try_from ( n ){ Ok ( n )=> start .  checked_add ( n ),  Err (_)=> None , }}# [ inline ] fn  backward_checked ( start :  Self ,  n :  usize )->  Option <  Self > { match  Self ::  try_from ( n ){ Ok ( n )=> start .  checked_sub ( n ),  Err (_)=> None , }}}# [ allow ( unreachable_patterns )]# [ unstable ( feature =  "step_trait" ,  reason =  "recently redesigned" ,  issue =  "42168" )] unsafe  impl  Step  for $i_narrower { step_identical_methods ! (); # [ inline ] fn  steps_between ( start : &  Self ,  end : &  Self )->  Option <  usize > { if *  start <= *  end { Some ((*  end  as  isize ).  wrapping_sub (*  start  as  isize ) as  usize )} else { None }}# [ inline ] fn  forward_checked ( start :  Self ,  n :  usize )->  Option <  Self > { match $u_narrower ::  try_from ( n ){ Ok ( n )=>{ let  wrapped =  start .  wrapping_add ( n  as  Self );  if  wrapped >=  start { Some ( wrapped )} else { None }} Err (_)=> None , }}# [ inline ] fn  backward_checked ( start :  Self ,  n :  usize )->  Option <  Self > { match $u_narrower ::  try_from ( n ){ Ok ( n )=>{ let  wrapped =  start .  wrapping_sub ( n  as  Self );  if  wrapped <=  start { Some ( wrapped )} else { None }} Err (_)=> None , }}})+ $(# [ allow ( unreachable_patterns )]# [ unstable ( feature =  "step_trait" ,  reason =  "recently redesigned" ,  issue =  "42168" )] unsafe  impl  Step  for $u_wider { step_identical_methods ! (); # [ inline ] fn  steps_between ( start : &  Self ,  end : &  Self )->  Option <  usize > { if *  start <= *  end { usize ::  try_from (*  end - *  start ).  ok ()} else { None }}# [ inline ] fn  forward_checked ( start :  Self ,  n :  usize )->  Option <  Self > { start .  checked_add ( n  as  Self )}# [ inline ] fn  backward_checked ( start :  Self ,  n :  usize )->  Option <  Self > { start .  checked_sub ( n  as  Self )}}# [ allow ( unreachable_patterns )]# [ unstable ( feature =  "step_trait" ,  reason =  "recently redesigned" ,  issue =  "42168" )] unsafe  impl  Step  for $i_wider { step_identical_methods ! (); # [ inline ] fn  steps_between ( start : &  Self ,  end : &  Self )->  Option <  usize > { if *  start <= *  end { match  end .  checked_sub (*  start ){ Some ( result )=> usize ::  try_from ( result ).  ok (),  None => None , }} else { None }}# [ inline ] fn  forward_checked ( start :  Self ,  n :  usize )->  Option <  Self > { start .  checked_add ( n  as  Self )}# [ inline ] fn  backward_checked ( start :  Self ,  n :  usize )->  Option <  Self > { start .  checked_sub ( n  as  Self )}})+ }; }
+macro_rules! __ra_macro_fixture60 {($($t :  ty )*)=>($(# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  ExactSizeIterator  for  ops ::  Range <$t > {})*)}
+macro_rules! __ra_macro_fixture61 {($($t :  ty )*)=>($(# [ stable ( feature =  "inclusive_range" ,  since =  "1.26.0" )] impl  ExactSizeIterator  for  ops ::  RangeInclusive <$t > {})*)}
+macro_rules! __ra_macro_fixture62 {(@  impls $zero :  expr , $one :  expr , # [$attr :  meta ], $($a :  ty )*)=>($(# [$attr ] impl  Sum  for $a { fn  sum <  I :  Iterator <  Item =  Self >> ( iter :  I )->  Self { iter .  fold ($zero ,  Add ::  add )}}# [$attr ] impl  Product  for $a { fn  product <  I :  Iterator <  Item =  Self >> ( iter :  I )->  Self { iter .  fold ($one ,  Mul ::  mul )}}# [$attr ] impl < 'a >  Sum <& 'a $a >  for $a { fn  sum <  I :  Iterator <  Item =& 'a  Self >> ( iter :  I )->  Self { iter .  fold ($zero ,  Add ::  add )}}# [$attr ] impl < 'a >  Product <& 'a $a >  for $a { fn  product <  I :  Iterator <  Item =& 'a  Self >> ( iter :  I )->  Self { iter .  fold ($one ,  Mul ::  mul )}})*); ($($a :  ty )*)=>( integer_sum_product ! (@  impls  0 ,  1 , # [ stable ( feature =  "iter_arith_traits" ,  since =  "1.12.0" )], $($a )*);  integer_sum_product ! (@  impls  Wrapping ( 0 ),  Wrapping ( 1 ), # [ stable ( feature =  "wrapping_iter_arith" ,  since =  "1.14.0" )], $(Wrapping <$a >)*); ); }
+macro_rules! __ra_macro_fixture63 {($($a :  ident )*)=>($(# [ stable ( feature =  "iter_arith_traits" ,  since =  "1.12.0" )] impl  Sum  for $a { fn  sum <  I :  Iterator <  Item =  Self >> ( iter :  I )->  Self { iter .  fold ( 0.0 ,  Add ::  add )}}# [ stable ( feature =  "iter_arith_traits" ,  since =  "1.12.0" )] impl  Product  for $a { fn  product <  I :  Iterator <  Item =  Self >> ( iter :  I )->  Self { iter .  fold ( 1.0 ,  Mul ::  mul )}}# [ stable ( feature =  "iter_arith_traits" ,  since =  "1.12.0" )] impl < 'a >  Sum <& 'a $a >  for $a { fn  sum <  I :  Iterator <  Item =& 'a  Self >> ( iter :  I )->  Self { iter .  fold ( 0.0 ,  Add ::  add )}}# [ stable ( feature =  "iter_arith_traits" ,  since =  "1.12.0" )] impl < 'a >  Product <& 'a $a >  for $a { fn  product <  I :  Iterator <  Item =& 'a  Self >> ( iter :  I )->  Self { iter .  fold ( 1.0 ,  Mul ::  mul )}})*)}
+macro_rules! __ra_macro_fixture64 {($cfg_cas :  meta , $cfg_align :  meta , $stable :  meta , $stable_cxchg :  meta , $stable_debug :  meta , $stable_access :  meta , $stable_from :  meta , $stable_nand :  meta , $const_stable :  meta , $stable_init_const :  meta , $s_int_type :  literal , $int_ref :  expr , $extra_feature :  expr , $min_fn :  ident , $max_fn :  ident , $align :  expr , $atomic_new :  expr , $int_type :  ident $atomic_type :  ident $atomic_init :  ident )=>{# [ doc =  " An integer type which can be safely shared between threads." ]# [ doc =  "" ]# [ doc =  " This type has the same in-memory representation as the underlying" ]# [ doc =  " integer type, [`" ]# [ doc = $s_int_type ]# [ doc =  " `](" ]# [ doc = $int_ref ]# [ doc =  " ). For more about the differences between atomic types and" ]# [ doc =  " non-atomic types as well as information about the portability of" ]# [ doc =  " this type, please see the [module-level documentation]." ]# [ doc =  "" ]# [ doc =  " **Note:** This type is only available on platforms that support" ]# [ doc =  " atomic loads and stores of [`" ]# [ doc = $s_int_type ]# [ doc =  " `](" ]# [ doc = $int_ref ]# [ doc =  " )." ]# [ doc =  "" ]# [ doc =  " [module-level documentation]: crate::sync::atomic" ]# [$stable ]# [ repr ( C ,  align ($align ))] pub  struct $atomic_type { v :  UnsafeCell <$int_type >, }# [ doc =  " An atomic integer initialized to `0`." ]# [$stable_init_const ]# [ rustc_deprecated ( since =  "1.34.0" ,  reason =  "the `new` function is now preferred" ,  suggestion = $atomic_new , )] pub  const $atomic_init : $atomic_type = $atomic_type ::  new ( 0 ); # [$stable ] impl  Default  for $atomic_type {# [ inline ] fn  default ()->  Self { Self ::  new ( Default ::  default ())}}# [$stable_from ] impl  From <$int_type >  for $atomic_type { doc_comment ! { concat ! ( "Converts an `" ,  stringify ! ($int_type ),  "` into an `" ,  stringify ! ($atomic_type ),  "`." ), # [ inline ] fn  from ( v : $int_type )->  Self { Self ::  new ( v )}}}# [$stable_debug ] impl  fmt ::  Debug  for $atomic_type { fn  fmt (&  self ,  f : &  mut  fmt ::  Formatter < '_ >)->  fmt ::  Result { fmt ::  Debug ::  fmt (&  self .  load ( Ordering ::  SeqCst ),  f )}}# [$stable ] unsafe  impl  Sync  for $atomic_type {} impl $atomic_type { doc_comment ! { concat ! ( "Creates a new atomic integer.\n\n# Examples\n\n```\n" , $extra_feature ,  "use std::sync::atomic::" ,  stringify ! ($atomic_type ),  ";\n\nlet atomic_forty_two = " ,  stringify ! ($atomic_type ),  "::new(42);\n```" ), # [ inline ]# [$stable ]# [$const_stable ] pub  const  fn  new ( v : $int_type )->  Self { Self { v :  UnsafeCell ::  new ( v )}}} doc_comment ! { concat ! ( "Returns a mutable reference to the underlying integer.\n\nThis is safe because the mutable reference guarantees that no other threads are\nconcurrently accessing the atomic data.\n\n# Examples\n\n```\n" , $extra_feature ,  "use std::sync::atomic::{" ,  stringify ! ($atomic_type ),  ", Ordering};\n\nlet mut some_var = " ,  stringify ! ($atomic_type ),  "::new(10);\nassert_eq!(*some_var.get_mut(), 10);\n*some_var.get_mut() = 5;\nassert_eq!(some_var.load(Ordering::SeqCst), 5);\n```" ), # [ inline ]# [$stable_access ] pub  fn  get_mut (&  mut  self )-> &  mut $int_type { self .  v .  get_mut ()}} doc_comment ! { concat ! ( "Get atomic access to a `&mut " ,  stringify ! ($int_type ),  "`.\n\n" ,  if_not_8_bit ! {$int_type ,  concat ! ( "**Note:** This function is only available on targets where `" ,  stringify ! ($int_type ),  "` has an alignment of " , $align ,  " bytes." )},  "\n\n# Examples\n\n```\n#![feature(atomic_from_mut)]\n" , $extra_feature ,  "use std::sync::atomic::{" ,  stringify ! ($atomic_type ),  ", Ordering};\n\nlet mut some_int = 123;\nlet a = " ,  stringify ! ($atomic_type ),  "::from_mut(&mut some_int);\na.store(100, Ordering::Relaxed);\nassert_eq!(some_int, 100);\n```\n                " ), # [ inline ]# [$cfg_align ]# [ unstable ( feature =  "atomic_from_mut" ,  issue =  "76314" )] pub  fn  from_mut ( v : &  mut $int_type )-> &  Self { use  crate ::  mem ::  align_of ;  let []= [();  align_of ::<  Self > ()-  align_of ::<$int_type > ()];  unsafe {&* ( v  as *  mut $int_type  as *  mut  Self )}}} doc_comment ! { concat ! ( "Consumes the atomic and returns the contained value.\n\nThis is safe because passing `self` by value guarantees that no other threads are\nconcurrently accessing the atomic data.\n\n# Examples\n\n```\n" , $extra_feature ,  "use std::sync::atomic::" ,  stringify ! ($atomic_type ),  ";\n\nlet some_var = " ,  stringify ! ($atomic_type ),  "::new(5);\nassert_eq!(some_var.into_inner(), 5);\n```" ), # [ inline ]# [$stable_access ]# [ rustc_const_unstable ( feature =  "const_cell_into_inner" ,  issue =  "78729" )] pub  const  fn  into_inner ( self )-> $int_type { self .  v .  into_inner ()}} doc_comment ! { concat ! ( "Loads a value from the atomic integer.\n\n`load` takes an [`Ordering`] argument which describes the memory ordering of this operation.\nPossible values are [`SeqCst`], [`Acquire`] and [`Relaxed`].\n\n# Panics\n\nPanics if `order` is [`Release`] or [`AcqRel`].\n\n# Examples\n\n```\n" , $extra_feature ,  "use std::sync::atomic::{" ,  stringify ! ($atomic_type ),  ", Ordering};\n\nlet some_var = " ,  stringify ! ($atomic_type ),  "::new(5);\n\nassert_eq!(some_var.load(Ordering::Relaxed), 5);\n```" ), # [ inline ]# [$stable ] pub  fn  load (&  self ,  order :  Ordering )-> $int_type { unsafe { atomic_load ( self .  v .  get (),  order )}}} doc_comment ! { concat ! ( "Stores a value into the atomic integer.\n\n`store` takes an [`Ordering`] argument which describes the memory ordering of this operation.\n Possible values are [`SeqCst`], [`Release`] and [`Relaxed`].\n\n# Panics\n\nPanics if `order` is [`Acquire`] or [`AcqRel`].\n\n# Examples\n\n```\n" , $extra_feature ,  "use std::sync::atomic::{" ,  stringify ! ($atomic_type ),  ", Ordering};\n\nlet some_var = " ,  stringify ! ($atomic_type ),  "::new(5);\n\nsome_var.store(10, Ordering::Relaxed);\nassert_eq!(some_var.load(Ordering::Relaxed), 10);\n```" ), # [ inline ]# [$stable ] pub  fn  store (&  self ,  val : $int_type ,  order :  Ordering ){ unsafe { atomic_store ( self .  v .  get (),  val ,  order ); }}} doc_comment ! { concat ! ( "Stores a value into the atomic integer, returning the previous value.\n\n`swap` takes an [`Ordering`] argument which describes the memory ordering\nof this operation. All ordering modes are possible. Note that using\n[`Acquire`] makes the store part of this operation [`Relaxed`], and\nusing [`Release`] makes the load part [`Relaxed`].\n\n**Note**: This method is only available on platforms that support atomic\noperations on [`" , $s_int_type ,  "`](" , $int_ref ,  ").\n\n# Examples\n\n```\n" , $extra_feature ,  "use std::sync::atomic::{" ,  stringify ! ($atomic_type ),  ", Ordering};\n\nlet some_var = " ,  stringify ! ($atomic_type ),  "::new(5);\n\nassert_eq!(some_var.swap(10, Ordering::Relaxed), 5);\n```" ), # [ inline ]# [$stable ]# [$cfg_cas ] pub  fn  swap (&  self ,  val : $int_type ,  order :  Ordering )-> $int_type { unsafe { atomic_swap ( self .  v .  get (),  val ,  order )}}} doc_comment ! { concat ! ( "Stores a value into the atomic integer if the current value is the same as\nthe `current` value.\n\nThe return value is always the previous value. If it is equal to `current`, then the\nvalue was updated.\n\n`compare_and_swap` also takes an [`Ordering`] argument which describes the memory\nordering of this operation. Notice that even when using [`AcqRel`], the operation\nmight fail and hence just perform an `Acquire` load, but not have `Release` semantics.\nUsing [`Acquire`] makes the store part of this operation [`Relaxed`] if it\nhappens, and using [`Release`] makes the load part [`Relaxed`].\n\n**Note**: This method is only available on platforms that support atomic\noperations on [`" , $s_int_type ,  "`](" , $int_ref ,  ").\n\n# Examples\n\n```\n" , $extra_feature ,  "use std::sync::atomic::{" ,  stringify ! ($atomic_type ),  ", Ordering};\n\nlet some_var = " ,  stringify ! ($atomic_type ),  "::new(5);\n\nassert_eq!(some_var.compare_and_swap(5, 10, Ordering::Relaxed), 5);\nassert_eq!(some_var.load(Ordering::Relaxed), 10);\n\nassert_eq!(some_var.compare_and_swap(6, 12, Ordering::Relaxed), 10);\nassert_eq!(some_var.load(Ordering::Relaxed), 10);\n```" ), # [ inline ]# [$stable ]# [$cfg_cas ] pub  fn  compare_and_swap (&  self ,  current : $int_type ,  new : $int_type ,  order :  Ordering )-> $int_type { match  self .  compare_exchange ( current ,  new ,  order ,  strongest_failure_ordering ( order )){ Ok ( x )=> x ,  Err ( x )=> x , }}} doc_comment ! { concat ! ( "Stores a value into the atomic integer if the current value is the same as\nthe `current` value.\n\nThe return value is a result indicating whether the new value was written and\ncontaining the previous value. On success this value is guaranteed to be equal to\n`current`.\n\n`compare_exchange` takes two [`Ordering`] arguments to describe the memory\nordering of this operation. The first describes the required ordering if the\noperation succeeds while the second describes the required ordering when the\noperation fails. Using [`Acquire`] as success ordering makes the store part\nof this operation [`Relaxed`], and using [`Release`] makes the successful load\n[`Relaxed`]. The failure ordering can only be [`SeqCst`], [`Acquire`] or [`Relaxed`]\nand must be equivalent to or weaker than the success ordering.\n\n**Note**: This method is only available on platforms that support atomic\noperations on [`" , $s_int_type ,  "`](" , $int_ref ,  ").\n\n# Examples\n\n```\n" , $extra_feature ,  "use std::sync::atomic::{" ,  stringify ! ($atomic_type ),  ", Ordering};\n\nlet some_var = " ,  stringify ! ($atomic_type ),  "::new(5);\n\nassert_eq!(some_var.compare_exchange(5, 10,\n                                     Ordering::Acquire,\n                                     Ordering::Relaxed),\n           Ok(5));\nassert_eq!(some_var.load(Ordering::Relaxed), 10);\n\nassert_eq!(some_var.compare_exchange(6, 12,\n                                     Ordering::SeqCst,\n                                     Ordering::Acquire),\n           Err(10));\nassert_eq!(some_var.load(Ordering::Relaxed), 10);\n```" ), # [ inline ]# [$stable_cxchg ]# [$cfg_cas ] pub  fn  compare_exchange (&  self ,  current : $int_type ,  new : $int_type ,  success :  Ordering ,  failure :  Ordering )->  Result <$int_type , $int_type > { unsafe { atomic_compare_exchange ( self .  v .  get (),  current ,  new ,  success ,  failure )}}} doc_comment ! { concat ! ( "Stores a value into the atomic integer if the current value is the same as\nthe `current` value.\n\nUnlike [`" ,  stringify ! ($atomic_type ),  "::compare_exchange`], this function is allowed to spuriously fail even\nwhen the comparison succeeds, which can result in more efficient code on some\nplatforms. The return value is a result indicating whether the new value was\nwritten and containing the previous value.\n\n`compare_exchange_weak` takes two [`Ordering`] arguments to describe the memory\nordering of this operation. The first describes the required ordering if the\noperation succeeds while the second describes the required ordering when the\noperation fails. Using [`Acquire`] as success ordering makes the store part\nof this operation [`Relaxed`], and using [`Release`] makes the successful load\n[`Relaxed`]. The failure ordering can only be [`SeqCst`], [`Acquire`] or [`Relaxed`]\nand must be equivalent to or weaker than the success ordering.\n\n**Note**: This method is only available on platforms that support atomic\noperations on [`" , $s_int_type ,  "`](" , $int_ref ,  ").\n\n# Examples\n\n```\n" , $extra_feature ,  "use std::sync::atomic::{" ,  stringify ! ($atomic_type ),  ", Ordering};\n\nlet val = " ,  stringify ! ($atomic_type ),  "::new(4);\n\nlet mut old = val.load(Ordering::Relaxed);\nloop {\n    let new = old * 2;\n    match val.compare_exchange_weak(old, new, Ordering::SeqCst, Ordering::Relaxed) {\n        Ok(_) => break,\n        Err(x) => old = x,\n    }\n}\n```" ), # [ inline ]# [$stable_cxchg ]# [$cfg_cas ] pub  fn  compare_exchange_weak (&  self ,  current : $int_type ,  new : $int_type ,  success :  Ordering ,  failure :  Ordering )->  Result <$int_type , $int_type > { unsafe { atomic_compare_exchange_weak ( self .  v .  get (),  current ,  new ,  success ,  failure )}}} doc_comment ! { concat ! ( "Adds to the current value, returning the previous value.\n\nThis operation wraps around on overflow.\n\n`fetch_add` takes an [`Ordering`] argument which describes the memory ordering\nof this operation. All ordering modes are possible. Note that using\n[`Acquire`] makes the store part of this operation [`Relaxed`], and\nusing [`Release`] makes the load part [`Relaxed`].\n\n**Note**: This method is only available on platforms that support atomic\noperations on [`" , $s_int_type ,  "`](" , $int_ref ,  ").\n\n# Examples\n\n```\n" , $extra_feature ,  "use std::sync::atomic::{" ,  stringify ! ($atomic_type ),  ", Ordering};\n\nlet foo = " ,  stringify ! ($atomic_type ),  "::new(0);\nassert_eq!(foo.fetch_add(10, Ordering::SeqCst), 0);\nassert_eq!(foo.load(Ordering::SeqCst), 10);\n```" ), # [ inline ]# [$stable ]# [$cfg_cas ] pub  fn  fetch_add (&  self ,  val : $int_type ,  order :  Ordering )-> $int_type { unsafe { atomic_add ( self .  v .  get (),  val ,  order )}}} doc_comment ! { concat ! ( "Subtracts from the current value, returning the previous value.\n\nThis operation wraps around on overflow.\n\n`fetch_sub` takes an [`Ordering`] argument which describes the memory ordering\nof this operation. All ordering modes are possible. Note that using\n[`Acquire`] makes the store part of this operation [`Relaxed`], and\nusing [`Release`] makes the load part [`Relaxed`].\n\n**Note**: This method is only available on platforms that support atomic\noperations on [`" , $s_int_type ,  "`](" , $int_ref ,  ").\n\n# Examples\n\n```\n" , $extra_feature ,  "use std::sync::atomic::{" ,  stringify ! ($atomic_type ),  ", Ordering};\n\nlet foo = " ,  stringify ! ($atomic_type ),  "::new(20);\nassert_eq!(foo.fetch_sub(10, Ordering::SeqCst), 20);\nassert_eq!(foo.load(Ordering::SeqCst), 10);\n```" ), # [ inline ]# [$stable ]# [$cfg_cas ] pub  fn  fetch_sub (&  self ,  val : $int_type ,  order :  Ordering )-> $int_type { unsafe { atomic_sub ( self .  v .  get (),  val ,  order )}}} doc_comment ! { concat ! ( "Bitwise \"and\" with the current value.\n\nPerforms a bitwise \"and\" operation on the current value and the argument `val`, and\nsets the new value to the result.\n\nReturns the previous value.\n\n`fetch_and` takes an [`Ordering`] argument which describes the memory ordering\nof this operation. All ordering modes are possible. Note that using\n[`Acquire`] makes the store part of this operation [`Relaxed`], and\nusing [`Release`] makes the load part [`Relaxed`].\n\n**Note**: This method is only available on platforms that support atomic\noperations on [`" , $s_int_type ,  "`](" , $int_ref ,  ").\n\n# Examples\n\n```\n" , $extra_feature ,  "use std::sync::atomic::{" ,  stringify ! ($atomic_type ),  ", Ordering};\n\nlet foo = " ,  stringify ! ($atomic_type ),  "::new(0b101101);\nassert_eq!(foo.fetch_and(0b110011, Ordering::SeqCst), 0b101101);\nassert_eq!(foo.load(Ordering::SeqCst), 0b100001);\n```" ), # [ inline ]# [$stable ]# [$cfg_cas ] pub  fn  fetch_and (&  self ,  val : $int_type ,  order :  Ordering )-> $int_type { unsafe { atomic_and ( self .  v .  get (),  val ,  order )}}} doc_comment ! { concat ! ( "Bitwise \"nand\" with the current value.\n\nPerforms a bitwise \"nand\" operation on the current value and the argument `val`, and\nsets the new value to the result.\n\nReturns the previous value.\n\n`fetch_nand` takes an [`Ordering`] argument which describes the memory ordering\nof this operation. All ordering modes are possible. Note that using\n[`Acquire`] makes the store part of this operation [`Relaxed`], and\nusing [`Release`] makes the load part [`Relaxed`].\n\n**Note**: This method is only available on platforms that support atomic\noperations on [`" , $s_int_type ,  "`](" , $int_ref ,  ").\n\n# Examples\n\n```\n" , $extra_feature ,  "\nuse std::sync::atomic::{" ,  stringify ! ($atomic_type ),  ", Ordering};\n\nlet foo = " ,  stringify ! ($atomic_type ),  "::new(0x13);\nassert_eq!(foo.fetch_nand(0x31, Ordering::SeqCst), 0x13);\nassert_eq!(foo.load(Ordering::SeqCst), !(0x13 & 0x31));\n```" ), # [ inline ]# [$stable_nand ]# [$cfg_cas ] pub  fn  fetch_nand (&  self ,  val : $int_type ,  order :  Ordering )-> $int_type { unsafe { atomic_nand ( self .  v .  get (),  val ,  order )}}} doc_comment ! { concat ! ( "Bitwise \"or\" with the current value.\n\nPerforms a bitwise \"or\" operation on the current value and the argument `val`, and\nsets the new value to the result.\n\nReturns the previous value.\n\n`fetch_or` takes an [`Ordering`] argument which describes the memory ordering\nof this operation. All ordering modes are possible. Note that using\n[`Acquire`] makes the store part of this operation [`Relaxed`], and\nusing [`Release`] makes the load part [`Relaxed`].\n\n**Note**: This method is only available on platforms that support atomic\noperations on [`" , $s_int_type ,  "`](" , $int_ref ,  ").\n\n# Examples\n\n```\n" , $extra_feature ,  "use std::sync::atomic::{" ,  stringify ! ($atomic_type ),  ", Ordering};\n\nlet foo = " ,  stringify ! ($atomic_type ),  "::new(0b101101);\nassert_eq!(foo.fetch_or(0b110011, Ordering::SeqCst), 0b101101);\nassert_eq!(foo.load(Ordering::SeqCst), 0b111111);\n```" ), # [ inline ]# [$stable ]# [$cfg_cas ] pub  fn  fetch_or (&  self ,  val : $int_type ,  order :  Ordering )-> $int_type { unsafe { atomic_or ( self .  v .  get (),  val ,  order )}}} doc_comment ! { concat ! ( "Bitwise \"xor\" with the current value.\n\nPerforms a bitwise \"xor\" operation on the current value and the argument `val`, and\nsets the new value to the result.\n\nReturns the previous value.\n\n`fetch_xor` takes an [`Ordering`] argument which describes the memory ordering\nof this operation. All ordering modes are possible. Note that using\n[`Acquire`] makes the store part of this operation [`Relaxed`], and\nusing [`Release`] makes the load part [`Relaxed`].\n\n**Note**: This method is only available on platforms that support atomic\noperations on [`" , $s_int_type ,  "`](" , $int_ref ,  ").\n\n# Examples\n\n```\n" , $extra_feature ,  "use std::sync::atomic::{" ,  stringify ! ($atomic_type ),  ", Ordering};\n\nlet foo = " ,  stringify ! ($atomic_type ),  "::new(0b101101);\nassert_eq!(foo.fetch_xor(0b110011, Ordering::SeqCst), 0b101101);\nassert_eq!(foo.load(Ordering::SeqCst), 0b011110);\n```" ), # [ inline ]# [$stable ]# [$cfg_cas ] pub  fn  fetch_xor (&  self ,  val : $int_type ,  order :  Ordering )-> $int_type { unsafe { atomic_xor ( self .  v .  get (),  val ,  order )}}} doc_comment ! { concat ! ( "Fetches the value, and applies a function to it that returns an optional\nnew value. Returns a `Result` of `Ok(previous_value)` if the function returned `Some(_)`, else\n`Err(previous_value)`.\n\nNote: This may call the function multiple times if the value has been changed from other threads in\nthe meantime, as long as the function returns `Some(_)`, but the function will have been applied\nonly once to the stored value.\n\n`fetch_update` takes two [`Ordering`] arguments to describe the memory ordering of this operation.\nThe first describes the required ordering for when the operation finally succeeds while the second\ndescribes the required ordering for loads. These correspond to the success and failure orderings of\n[`" ,  stringify ! ($atomic_type ),  "::compare_exchange`] respectively.\n\nUsing [`Acquire`] as success ordering makes the store part\nof this operation [`Relaxed`], and using [`Release`] makes the final successful load\n[`Relaxed`]. The (failed) load ordering can only be [`SeqCst`], [`Acquire`] or [`Relaxed`]\nand must be equivalent to or weaker than the success ordering.\n\n**Note**: This method is only available on platforms that support atomic\noperations on [`" , $s_int_type ,  "`](" , $int_ref ,  ").\n\n# Examples\n\n```rust\n" , $extra_feature ,  "use std::sync::atomic::{" ,  stringify ! ($atomic_type ),  ", Ordering};\n\nlet x = " ,  stringify ! ($atomic_type ),  "::new(7);\nassert_eq!(x.fetch_update(Ordering::SeqCst, Ordering::SeqCst, |_| None), Err(7));\nassert_eq!(x.fetch_update(Ordering::SeqCst, Ordering::SeqCst, |x| Some(x + 1)), Ok(7));\nassert_eq!(x.fetch_update(Ordering::SeqCst, Ordering::SeqCst, |x| Some(x + 1)), Ok(8));\nassert_eq!(x.load(Ordering::SeqCst), 9);\n```" ), # [ inline ]# [ stable ( feature =  "no_more_cas" ,  since =  "1.45.0" )]# [$cfg_cas ] pub  fn  fetch_update <  F > (&  self ,  set_order :  Ordering ,  fetch_order :  Ordering ,  mut  f :  F )->  Result <$int_type , $int_type >  where  F :  FnMut ($int_type )->  Option <$int_type > { let  mut  prev =  self .  load ( fetch_order );  while  let  Some ( next )=  f ( prev ){ match  self .  compare_exchange_weak ( prev ,  next ,  set_order ,  fetch_order ){ x @  Ok (_)=> return  x ,  Err ( next_prev )=> prev =  next_prev }} Err ( prev )}} doc_comment ! { concat ! ( "Maximum with the current value.\n\nFinds the maximum of the current value and the argument `val`, and\nsets the new value to the result.\n\nReturns the previous value.\n\n`fetch_max` takes an [`Ordering`] argument which describes the memory ordering\nof this operation. All ordering modes are possible. Note that using\n[`Acquire`] makes the store part of this operation [`Relaxed`], and\nusing [`Release`] makes the load part [`Relaxed`].\n\n**Note**: This method is only available on platforms that support atomic\noperations on [`" , $s_int_type ,  "`](" , $int_ref ,  ").\n\n# Examples\n\n```\n" , $extra_feature ,  "use std::sync::atomic::{" ,  stringify ! ($atomic_type ),  ", Ordering};\n\nlet foo = " ,  stringify ! ($atomic_type ),  "::new(23);\nassert_eq!(foo.fetch_max(42, Ordering::SeqCst), 23);\nassert_eq!(foo.load(Ordering::SeqCst), 42);\n```\n\nIf you want to obtain the maximum value in one step, you can use the following:\n\n```\n" , $extra_feature ,  "use std::sync::atomic::{" ,  stringify ! ($atomic_type ),  ", Ordering};\n\nlet foo = " ,  stringify ! ($atomic_type ),  "::new(23);\nlet bar = 42;\nlet max_foo = foo.fetch_max(bar, Ordering::SeqCst).max(bar);\nassert!(max_foo == 42);\n```" ), # [ inline ]# [ stable ( feature =  "atomic_min_max" ,  since =  "1.45.0" )]# [$cfg_cas ] pub  fn  fetch_max (&  self ,  val : $int_type ,  order :  Ordering )-> $int_type { unsafe {$max_fn ( self .  v .  get (),  val ,  order )}}} doc_comment ! { concat ! ( "Minimum with the current value.\n\nFinds the minimum of the current value and the argument `val`, and\nsets the new value to the result.\n\nReturns the previous value.\n\n`fetch_min` takes an [`Ordering`] argument which describes the memory ordering\nof this operation. All ordering modes are possible. Note that using\n[`Acquire`] makes the store part of this operation [`Relaxed`], and\nusing [`Release`] makes the load part [`Relaxed`].\n\n**Note**: This method is only available on platforms that support atomic\noperations on [`" , $s_int_type ,  "`](" , $int_ref ,  ").\n\n# Examples\n\n```\n" , $extra_feature ,  "use std::sync::atomic::{" ,  stringify ! ($atomic_type ),  ", Ordering};\n\nlet foo = " ,  stringify ! ($atomic_type ),  "::new(23);\nassert_eq!(foo.fetch_min(42, Ordering::Relaxed), 23);\nassert_eq!(foo.load(Ordering::Relaxed), 23);\nassert_eq!(foo.fetch_min(22, Ordering::Relaxed), 23);\nassert_eq!(foo.load(Ordering::Relaxed), 22);\n```\n\nIf you want to obtain the minimum value in one step, you can use the following:\n\n```\n" , $extra_feature ,  "use std::sync::atomic::{" ,  stringify ! ($atomic_type ),  ", Ordering};\n\nlet foo = " ,  stringify ! ($atomic_type ),  "::new(23);\nlet bar = 12;\nlet min_foo = foo.fetch_min(bar, Ordering::SeqCst).min(bar);\nassert_eq!(min_foo, 12);\n```" ), # [ inline ]# [ stable ( feature =  "atomic_min_max" ,  since =  "1.45.0" )]# [$cfg_cas ] pub  fn  fetch_min (&  self ,  val : $int_type ,  order :  Ordering )-> $int_type { unsafe {$min_fn ( self .  v .  get (),  val ,  order )}}} doc_comment ! { concat ! ( "Returns a mutable pointer to the underlying integer.\n\nDoing non-atomic reads and writes on the resulting integer can be a data race.\nThis method is mostly useful for FFI, where the function signature may use\n`*mut " ,  stringify ! ($int_type ),  "` instead of `&" ,  stringify ! ($atomic_type ),  "`.\n\nReturning an `*mut` pointer from a shared reference to this atomic is safe because the\natomic types work with interior mutability. All modifications of an atomic change the value\nthrough a shared reference, and can do so safely as long as they use atomic operations. Any\nuse of the returned raw pointer requires an `unsafe` block and still has to uphold the same\nrestriction: operations on it must be atomic.\n\n# Examples\n\n```ignore (extern-declaration)\n# fn main() {\n" , $extra_feature ,  "use std::sync::atomic::" ,  stringify ! ($atomic_type ),  ";\n\nextern {\n    fn my_atomic_op(arg: *mut " ,  stringify ! ($int_type ),  ");\n}\n\nlet mut atomic = " ,  stringify ! ($atomic_type ),  "::new(1);\n" ,  "unsafe {\n    my_atomic_op(atomic.as_mut_ptr());\n}\n# }\n```" ), # [ inline ]# [ unstable ( feature =  "atomic_mut_ptr" ,  reason =  "recently added" ,  issue =  "66893" )] pub  fn  as_mut_ptr (&  self )-> *  mut $int_type { self .  v .  get ()}}}}}
+macro_rules! __ra_macro_fixture65 {($($target_pointer_width :  literal $align :  literal )* )=>{$(# [ cfg ( target_has_atomic_load_store =  "ptr" )]# [ cfg ( target_pointer_width = $target_pointer_width )] atomic_int ! { cfg ( target_has_atomic =  "ptr" ),  cfg ( target_has_atomic_equal_alignment =  "ptr" ),  stable ( feature =  "rust1" ,  since =  "1.0.0" ),  stable ( feature =  "extended_compare_and_swap" ,  since =  "1.10.0" ),  stable ( feature =  "atomic_debug" ,  since =  "1.3.0" ),  stable ( feature =  "atomic_access" ,  since =  "1.15.0" ),  stable ( feature =  "atomic_from" ,  since =  "1.23.0" ),  stable ( feature =  "atomic_nand" ,  since =  "1.27.0" ),  rustc_const_stable ( feature =  "const_integer_atomics" ,  since =  "1.34.0" ),  stable ( feature =  "rust1" ,  since =  "1.0.0" ),  "isize" ,  "../../../std/primitive.isize.html" ,  "" ,  atomic_min ,  atomic_max , $align ,  "AtomicIsize::new(0)" ,  isize  AtomicIsize  ATOMIC_ISIZE_INIT }# [ cfg ( target_has_atomic_load_store =  "ptr" )]# [ cfg ( target_pointer_width = $target_pointer_width )] atomic_int ! { cfg ( target_has_atomic =  "ptr" ),  cfg ( target_has_atomic_equal_alignment =  "ptr" ),  stable ( feature =  "rust1" ,  since =  "1.0.0" ),  stable ( feature =  "extended_compare_and_swap" ,  since =  "1.10.0" ),  stable ( feature =  "atomic_debug" ,  since =  "1.3.0" ),  stable ( feature =  "atomic_access" ,  since =  "1.15.0" ),  stable ( feature =  "atomic_from" ,  since =  "1.23.0" ),  stable ( feature =  "atomic_nand" ,  since =  "1.27.0" ),  rustc_const_stable ( feature =  "const_integer_atomics" ,  since =  "1.34.0" ),  stable ( feature =  "rust1" ,  since =  "1.0.0" ),  "usize" ,  "../../../std/primitive.usize.html" ,  "" ,  atomic_umin ,  atomic_umax , $align ,  "AtomicUsize::new(0)" ,  usize  AtomicUsize  ATOMIC_USIZE_INIT })* }; }
+macro_rules! __ra_macro_fixture66 {($ty :  ident )=>{# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  Debug  for $ty { fn  fmt (&  self ,  fmt : &  mut  Formatter < '_ >)->  Result { float_to_decimal_common ( fmt ,  self ,  true ,  1 )}}# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  Display  for $ty { fn  fmt (&  self ,  fmt : &  mut  Formatter < '_ >)->  Result { float_to_decimal_common ( fmt ,  self ,  false ,  0 )}}# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  LowerExp  for $ty { fn  fmt (&  self ,  fmt : &  mut  Formatter < '_ >)->  Result { float_to_exponential_common ( fmt ,  self ,  false )}}# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  UpperExp  for $ty { fn  fmt (&  self ,  fmt : &  mut  Formatter < '_ >)->  Result { float_to_exponential_common ( fmt ,  self ,  true )}}}; }
+macro_rules! __ra_macro_fixture67 {($($t :  ident )*)=>($(impl  DisplayInt  for $t { fn  zero ()->  Self { 0 } fn  from_u8 ( u :  u8 )->  Self { u  as  Self } fn  to_u8 (&  self )->  u8 {*  self  as  u8 } fn  to_u16 (&  self )->  u16 {*  self  as  u16 } fn  to_u32 (&  self )->  u32 {*  self  as  u32 } fn  to_u64 (&  self )->  u64 {*  self  as  u64 } fn  to_u128 (&  self )->  u128 {*  self  as  u128 }})* )}
+macro_rules! __ra_macro_fixture68 {($($t :  ident )*)=>($(impl  DisplayInt  for $t { fn  zero ()->  Self { 0 } fn  from_u8 ( u :  u8 )->  Self { u  as  Self } fn  to_u8 (&  self )->  u8 {*  self  as  u8 } fn  to_u16 (&  self )->  u16 {*  self  as  u16 } fn  to_u32 (&  self )->  u32 {*  self  as  u32 } fn  to_u64 (&  self )->  u64 {*  self  as  u64 } fn  to_u128 (&  self )->  u128 {*  self  as  u128 }})* )}
+macro_rules! __ra_macro_fixture69 {($T :  ident , $base :  expr , $prefix :  expr , $($x :  pat =>$conv :  expr ),+)=>{ impl  GenericRadix  for $T { const  BASE :  u8 = $base ;  const  PREFIX : & 'static  str = $prefix ;  fn  digit ( x :  u8 )->  u8 { match  x {$($x =>$conv ,)+  x => panic ! ( "number not in the range 0..={}: {}" ,  Self ::  BASE -  1 ,  x ), }}}}}
+macro_rules! __ra_macro_fixture70 {($Int :  ident , $Uint :  ident )=>{ int_base ! { fmt ::  Binary  for $Int  as $Uint ->  Binary } int_base ! { fmt ::  Octal  for $Int  as $Uint ->  Octal } int_base ! { fmt ::  LowerHex  for $Int  as $Uint ->  LowerHex } int_base ! { fmt ::  UpperHex  for $Int  as $Uint ->  UpperHex } int_base ! { fmt ::  Binary  for $Uint  as $Uint ->  Binary } int_base ! { fmt ::  Octal  for $Uint  as $Uint ->  Octal } int_base ! { fmt ::  LowerHex  for $Uint  as $Uint ->  LowerHex } int_base ! { fmt ::  UpperHex  for $Uint  as $Uint ->  UpperHex }}; }
+macro_rules! __ra_macro_fixture71 {($($T :  ident )*)=>{$(# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  fmt ::  Debug  for $T {# [ inline ] fn  fmt (&  self ,  f : &  mut  fmt ::  Formatter < '_ >)->  fmt ::  Result { if  f .  debug_lower_hex (){ fmt ::  LowerHex ::  fmt ( self ,  f )} else  if  f .  debug_upper_hex (){ fmt ::  UpperHex ::  fmt ( self ,  f )} else { fmt ::  Display ::  fmt ( self ,  f )}}})*}; }
+macro_rules! __ra_macro_fixture72 {($($t :  ident ),*  as $u :  ident  via $conv_fn :  ident  named $name :  ident )=>{ fn $name ( mut  n : $u ,  is_nonnegative :  bool ,  f : &  mut  fmt ::  Formatter < '_ >)->  fmt ::  Result { let  mut  buf = [ MaybeUninit ::<  u8 >::  uninit ();  39 ];  let  mut  curr =  buf .  len () as  isize ;  let  buf_ptr =  MaybeUninit ::  slice_as_mut_ptr (&  mut  buf );  let  lut_ptr =  DEC_DIGITS_LUT .  as_ptr ();  unsafe { assert ! ( crate ::  mem ::  size_of ::<$u > ()>=  2 );  while  n >=  10000 { let  rem = ( n %  10000 ) as  isize ;  n /=  10000 ;  let  d1 = ( rem /  100 )<<  1 ;  let  d2 = ( rem %  100 )<<  1 ;  curr -=  4 ;  ptr ::  copy_nonoverlapping ( lut_ptr .  offset ( d1 ),  buf_ptr .  offset ( curr ),  2 );  ptr ::  copy_nonoverlapping ( lut_ptr .  offset ( d2 ),  buf_ptr .  offset ( curr +  2 ),  2 ); } let  mut  n =  n  as  isize ;  if  n >=  100 { let  d1 = ( n %  100 )<<  1 ;  n /=  100 ;  curr -=  2 ;  ptr ::  copy_nonoverlapping ( lut_ptr .  offset ( d1 ),  buf_ptr .  offset ( curr ),  2 ); } if  n <  10 { curr -=  1 ; *  buf_ptr .  offset ( curr )= ( n  as  u8 )+  b'0' ; } else { let  d1 =  n <<  1 ;  curr -=  2 ;  ptr ::  copy_nonoverlapping ( lut_ptr .  offset ( d1 ),  buf_ptr .  offset ( curr ),  2 ); }} let  buf_slice =  unsafe { str ::  from_utf8_unchecked ( slice ::  from_raw_parts ( buf_ptr .  offset ( curr ),  buf .  len ()-  curr  as  usize ))};  f .  pad_integral ( is_nonnegative ,  "" ,  buf_slice )}$(# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  fmt ::  Display  for $t {# [ allow ( unused_comparisons )] fn  fmt (&  self ,  f : &  mut  fmt ::  Formatter < '_ >)->  fmt ::  Result { let  is_nonnegative = *  self >=  0 ;  let  n =  if  is_nonnegative { self .$conv_fn ()} else {(!  self .$conv_fn ()).  wrapping_add ( 1 )}; $name ( n ,  is_nonnegative ,  f )}})* }; }
+macro_rules! __ra_macro_fixture73 {($($t :  ident ),*  as $u :  ident  via $conv_fn :  ident  named $name :  ident )=>{ fn $name ( mut  n : $u ,  is_nonnegative :  bool ,  upper :  bool ,  f : &  mut  fmt ::  Formatter < '_ > )->  fmt ::  Result { let ( mut  n ,  mut  exponent ,  trailing_zeros ,  added_precision )= { let  mut  exponent =  0 ;  while  n %  10 ==  0 &&  n >=  10 { n /=  10 ;  exponent +=  1 ; } let  trailing_zeros =  exponent ;  let ( added_precision ,  subtracted_precision )=  match  f .  precision (){ Some ( fmt_prec )=>{ let  mut  tmp =  n ;  let  mut  prec =  0 ;  while  tmp >=  10 { tmp /=  10 ;  prec +=  1 ; }( fmt_prec .  saturating_sub ( prec ),  prec .  saturating_sub ( fmt_prec ))} None =>( 0 ,  0 )};  for _  in  1 ..  subtracted_precision { n /=  10 ;  exponent +=  1 ; } if  subtracted_precision !=  0 { let  rem =  n %  10 ;  n /=  10 ;  exponent +=  1 ;  if  rem >=  5 { n +=  1 ; }}( n ,  exponent ,  trailing_zeros ,  added_precision )};  let  mut  buf = [ MaybeUninit ::<  u8 >::  uninit ();  40 ];  let  mut  curr =  buf .  len () as  isize ;  let  buf_ptr =  MaybeUninit ::  slice_as_mut_ptr (&  mut  buf );  let  lut_ptr =  DEC_DIGITS_LUT .  as_ptr ();  while  n >=  100 { let  d1 = (( n %  100 ) as  isize )<<  1 ;  curr -=  2 ;  unsafe { ptr ::  copy_nonoverlapping ( lut_ptr .  offset ( d1 ),  buf_ptr .  offset ( curr ),  2 ); } n /=  100 ;  exponent +=  2 ; } let  mut  n =  n  as  isize ;  if  n >=  10 { curr -=  1 ;  unsafe {*  buf_ptr .  offset ( curr )= ( n  as  u8 %  10_u8 )+  b'0' ; } n /=  10 ;  exponent +=  1 ; } if  exponent !=  trailing_zeros ||  added_precision !=  0 { curr -=  1 ;  unsafe {*  buf_ptr .  offset ( curr )=  b'.' ; }} let  buf_slice =  unsafe { curr -=  1 ; *  buf_ptr .  offset ( curr )= ( n  as  u8 )+  b'0' ;  let  len =  buf .  len ()-  curr  as  usize ;  slice ::  from_raw_parts ( buf_ptr .  offset ( curr ),  len )};  let  mut  exp_buf = [ MaybeUninit ::<  u8 >::  uninit ();  3 ];  let  exp_ptr =  MaybeUninit ::  slice_as_mut_ptr (&  mut  exp_buf );  let  exp_slice =  unsafe {*  exp_ptr .  offset ( 0 )=  if  upper { b'E' } else { b'e' };  let  len =  if  exponent <  10 {*  exp_ptr .  offset ( 1 )= ( exponent  as  u8 )+  b'0' ;  2 } else { let  off =  exponent <<  1 ;  ptr ::  copy_nonoverlapping ( lut_ptr .  offset ( off ),  exp_ptr .  offset ( 1 ),  2 );  3 };  slice ::  from_raw_parts ( exp_ptr ,  len )};  let  parts = & [ flt2dec ::  Part ::  Copy ( buf_slice ),  flt2dec ::  Part ::  Zero ( added_precision ),  flt2dec ::  Part ::  Copy ( exp_slice )];  let  sign =  if !  is_nonnegative { "-" } else  if  f .  sign_plus (){ "+" } else { "" };  let  formatted =  flt2dec ::  Formatted { sign ,  parts };  f .  pad_formatted_parts (&  formatted )}$(# [ stable ( feature =  "integer_exp_format" ,  since =  "1.42.0" )] impl  fmt ::  LowerExp  for $t {# [ allow ( unused_comparisons )] fn  fmt (&  self ,  f : &  mut  fmt ::  Formatter < '_ >)->  fmt ::  Result { let  is_nonnegative = *  self >=  0 ;  let  n =  if  is_nonnegative { self .$conv_fn ()} else {(!  self .$conv_fn ()).  wrapping_add ( 1 )}; $name ( n ,  is_nonnegative ,  false ,  f )}})* $(# [ stable ( feature =  "integer_exp_format" ,  since =  "1.42.0" )] impl  fmt ::  UpperExp  for $t {# [ allow ( unused_comparisons )] fn  fmt (&  self ,  f : &  mut  fmt ::  Formatter < '_ >)->  fmt ::  Result { let  is_nonnegative = *  self >=  0 ;  let  n =  if  is_nonnegative { self .$conv_fn ()} else {(!  self .$conv_fn ()).  wrapping_add ( 1 )}; $name ( n ,  is_nonnegative ,  true ,  f )}})* }; }
+macro_rules! __ra_macro_fixture74 {($($tr :  ident ),*)=>{$(# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl <  T : ?  Sized + $tr > $tr  for &  T { fn  fmt (&  self ,  f : &  mut  Formatter < '_ >)->  Result {$tr ::  fmt (&**  self ,  f )}}# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl <  T : ?  Sized + $tr > $tr  for &  mut  T { fn  fmt (&  self ,  f : &  mut  Formatter < '_ >)->  Result {$tr ::  fmt (&**  self ,  f )}})* }}
+macro_rules! __ra_macro_fixture75 {()=>(); ($($name :  ident ,)+ )=>(# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl <$($name :  Debug ),+>  Debug  for ($($name ,)+) where  last_type ! ($($name ,)+): ?  Sized {# [ allow ( non_snake_case ,  unused_assignments )] fn  fmt (&  self ,  f : &  mut  Formatter < '_ >)->  Result { let  mut  builder =  f .  debug_tuple ( "" );  let ($(ref $name ,)+)= *  self ; $(builder .  field (&$name ); )+  builder .  finish ()}} peel ! {$($name ,)+ })}
+macro_rules! __ra_macro_fixture76 {($(($ty :  ident , $meth :  ident ),)*)=>{$(# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  Hash  for $ty { fn  hash <  H :  Hasher > (&  self ,  state : &  mut  H ){ state .$meth (*  self )} fn  hash_slice <  H :  Hasher > ( data : & [$ty ],  state : &  mut  H ){ let  newlen =  data .  len ()*  mem ::  size_of ::<$ty > ();  let  ptr =  data .  as_ptr () as *  const  u8 ;  state .  write ( unsafe { slice ::  from_raw_parts ( ptr ,  newlen )})}})*}}
+macro_rules! __ra_macro_fixture77 {()=>(# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  Hash  for (){ fn  hash <  H :  Hasher > (&  self ,  _state : &  mut  H ){}}); ($($name :  ident )+)=>(# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl <$($name :  Hash ),+>  Hash  for ($($name ,)+) where  last_type ! ($($name ,)+): ?  Sized {# [ allow ( non_snake_case )] fn  hash <  S :  Hasher > (&  self ,  state : &  mut  S ){ let ($(ref $name ,)+)= *  self ; $($name .  hash ( state );)+ }}); }
+macro_rules! __ra_macro_fixture78 {($([$($p :  tt )*]$t :  ty ,)*)=>{$(impl <$($p )*>  AlwaysApplicableOrd  for $t {})* }}
+macro_rules! __ra_macro_fixture79 {($traitname :  ident , $($ty :  ty )*)=>{$(impl $traitname <$ty >  for $ty {})* }}
+macro_rules! __ra_macro_fixture80 {( struct $name :  ident -> $ptr :  ty , $elem :  ty , $raw_mut :  tt , {$($mut_ :  tt )?}, {$($extra :  tt )*})=>{ macro_rules !  next_unchecked {($self :  ident )=>{& $($mut_ )? *$self .  post_inc_start ( 1 )}} macro_rules !  next_back_unchecked {($self :  ident )=>{& $($mut_ )? *$self .  pre_dec_end ( 1 )}} macro_rules !  zst_shrink {($self :  ident , $n :  ident )=>{$self .  end = ($self .  end  as * $raw_mut  u8 ).  wrapping_offset (-$n ) as * $raw_mut  T ; }} impl < 'a ,  T > $name < 'a ,  T > {# [ inline ( always )] fn  make_slice (&  self )-> & 'a [ T ]{ unsafe { from_raw_parts ( self .  ptr .  as_ptr (),  len ! ( self ))}}# [ inline ( always )] unsafe  fn  post_inc_start (&  mut  self ,  offset :  isize )-> * $raw_mut  T { if  mem ::  size_of ::<  T > ()==  0 { zst_shrink ! ( self ,  offset );  self .  ptr .  as_ptr ()} else { let  old =  self .  ptr .  as_ptr ();  self .  ptr =  unsafe { NonNull ::  new_unchecked ( self .  ptr .  as_ptr ().  offset ( offset ))};  old }}# [ inline ( always )] unsafe  fn  pre_dec_end (&  mut  self ,  offset :  isize )-> * $raw_mut  T { if  mem ::  size_of ::<  T > ()==  0 { zst_shrink ! ( self ,  offset );  self .  ptr .  as_ptr ()} else { self .  end =  unsafe { self .  end .  offset (-  offset )};  self .  end }}}# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl <  T >  ExactSizeIterator  for $name < '_ ,  T > {# [ inline ( always )] fn  len (&  self )->  usize { len ! ( self )}# [ inline ( always )] fn  is_empty (&  self )->  bool { is_empty ! ( self )}}# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl < 'a ,  T >  Iterator  for $name < 'a ,  T > { type  Item = $elem ; # [ inline ] fn  next (&  mut  self )->  Option <$elem > { unsafe { assume (!  self .  ptr .  as_ptr ().  is_null ());  if  mem ::  size_of ::<  T > ()!=  0 { assume (!  self .  end .  is_null ()); } if  is_empty ! ( self ){ None } else { Some ( next_unchecked ! ( self ))}}}# [ inline ] fn  size_hint (&  self )-> ( usize ,  Option <  usize >){ let  exact =  len ! ( self ); ( exact ,  Some ( exact ))}# [ inline ] fn  count ( self )->  usize { len ! ( self )}# [ inline ] fn  nth (&  mut  self ,  n :  usize )->  Option <$elem > { if  n >=  len ! ( self ){ if  mem ::  size_of ::<  T > ()==  0 { self .  end =  self .  ptr .  as_ptr (); } else { unsafe { self .  ptr =  NonNull ::  new_unchecked ( self .  end  as *  mut  T ); }} return  None ; } unsafe { self .  post_inc_start ( n  as  isize );  Some ( next_unchecked ! ( self ))}}# [ inline ] fn  last ( mut  self )->  Option <$elem > { self .  next_back ()}# [ inline ] fn  for_each <  F > ( mut  self ,  mut  f :  F ) where  Self :  Sized ,  F :  FnMut ( Self ::  Item ), { while  let  Some ( x )=  self .  next (){ f ( x ); }}# [ inline ] fn  all <  F > (&  mut  self ,  mut  f :  F )->  bool  where  Self :  Sized ,  F :  FnMut ( Self ::  Item )->  bool , { while  let  Some ( x )=  self .  next (){ if !  f ( x ){ return  false ; }} true }# [ inline ] fn  any <  F > (&  mut  self ,  mut  f :  F )->  bool  where  Self :  Sized ,  F :  FnMut ( Self ::  Item )->  bool , { while  let  Some ( x )=  self .  next (){ if  f ( x ){ return  true ; }} false }# [ inline ] fn  find <  P > (&  mut  self ,  mut  predicate :  P )->  Option <  Self ::  Item >  where  Self :  Sized ,  P :  FnMut (&  Self ::  Item )->  bool , { while  let  Some ( x )=  self .  next (){ if  predicate (&  x ){ return  Some ( x ); }} None }# [ inline ] fn  find_map <  B ,  F > (&  mut  self ,  mut  f :  F )->  Option <  B >  where  Self :  Sized ,  F :  FnMut ( Self ::  Item )->  Option <  B >, { while  let  Some ( x )=  self .  next (){ if  let  Some ( y )=  f ( x ){ return  Some ( y ); }} None }# [ inline ]# [ rustc_inherit_overflow_checks ] fn  position <  P > (&  mut  self ,  mut  predicate :  P )->  Option <  usize >  where  Self :  Sized ,  P :  FnMut ( Self ::  Item )->  bool , { let  n =  len ! ( self );  let  mut  i =  0 ;  while  let  Some ( x )=  self .  next (){ if  predicate ( x ){ unsafe { assume ( i <  n )};  return  Some ( i ); } i +=  1 ; } None }# [ inline ] fn  rposition <  P > (&  mut  self ,  mut  predicate :  P )->  Option <  usize >  where  P :  FnMut ( Self ::  Item )->  bool ,  Self :  Sized +  ExactSizeIterator +  DoubleEndedIterator { let  n =  len ! ( self );  let  mut  i =  n ;  while  let  Some ( x )=  self .  next_back (){ i -=  1 ;  if  predicate ( x ){ unsafe { assume ( i <  n )};  return  Some ( i ); }} None }# [ doc ( hidden )] unsafe  fn  __iterator_get_unchecked (&  mut  self ,  idx :  usize )->  Self ::  Item { unsafe {& $($mut_ )? *  self .  ptr .  as_ptr ().  add ( idx )}}$($extra )* }# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl < 'a ,  T >  DoubleEndedIterator  for $name < 'a ,  T > {# [ inline ] fn  next_back (&  mut  self )->  Option <$elem > { unsafe { assume (!  self .  ptr .  as_ptr ().  is_null ());  if  mem ::  size_of ::<  T > ()!=  0 { assume (!  self .  end .  is_null ()); } if  is_empty ! ( self ){ None } else { Some ( next_back_unchecked ! ( self ))}}}# [ inline ] fn  nth_back (&  mut  self ,  n :  usize )->  Option <$elem > { if  n >=  len ! ( self ){ self .  end =  self .  ptr .  as_ptr ();  return  None ; } unsafe { self .  pre_dec_end ( n  as  isize );  Some ( next_back_unchecked ! ( self ))}}}# [ stable ( feature =  "fused" ,  since =  "1.26.0" )] impl <  T >  FusedIterator  for $name < '_ ,  T > {}# [ unstable ( feature =  "trusted_len" ,  issue =  "37572" )] unsafe  impl <  T >  TrustedLen  for $name < '_ ,  T > {}}}
+macro_rules! __ra_macro_fixture81 {($name :  ident : $elem :  ident , $iter_of :  ty )=>{# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl < 'a , $elem ,  P >  Iterator  for $name < 'a , $elem ,  P >  where  P :  FnMut (&  T )->  bool , { type  Item = $iter_of ; # [ inline ] fn  next (&  mut  self )->  Option <$iter_of > { self .  inner .  next ()}# [ inline ] fn  size_hint (&  self )-> ( usize ,  Option <  usize >){ self .  inner .  size_hint ()}}# [ stable ( feature =  "fused" ,  since =  "1.26.0" )] impl < 'a , $elem ,  P >  FusedIterator  for $name < 'a , $elem ,  P >  where  P :  FnMut (&  T )->  bool {}}; }
+macro_rules! __ra_macro_fixture82 {( clone $t :  ident  with |$s :  ident | $e :  expr )=>{ impl < 'a ,  P >  Clone  for $t < 'a ,  P >  where  P :  Pattern < 'a ,  Searcher :  Clone >, { fn  clone (&  self )->  Self { let $s =  self ; $e }}}; }
+macro_rules! __ra_macro_fixture83 {{ forward : $(# [$forward_iterator_attribute :  meta ])*  struct $forward_iterator :  ident ;  reverse : $(# [$reverse_iterator_attribute :  meta ])*  struct $reverse_iterator :  ident ;  stability : $(# [$common_stability_attribute :  meta ])*  internal : $internal_iterator :  ident  yielding ($iterty :  ty );  delegate $($t :  tt )* }=>{$(# [$forward_iterator_attribute ])* $(# [$common_stability_attribute ])*  pub  struct $forward_iterator < 'a ,  P :  Pattern < 'a >> ( pub ( super )$internal_iterator < 'a ,  P >); $(# [$common_stability_attribute ])*  impl < 'a ,  P >  fmt ::  Debug  for $forward_iterator < 'a ,  P >  where  P :  Pattern < 'a ,  Searcher :  fmt ::  Debug >, { fn  fmt (&  self ,  f : &  mut  fmt ::  Formatter < '_ >)->  fmt ::  Result { f .  debug_tuple ( stringify ! ($forward_iterator )).  field (&  self .  0 ).  finish ()}}$(# [$common_stability_attribute ])*  impl < 'a ,  P :  Pattern < 'a >>  Iterator  for $forward_iterator < 'a ,  P > { type  Item = $iterty ; # [ inline ] fn  next (&  mut  self )->  Option <$iterty > { self .  0 .  next ()}}$(# [$common_stability_attribute ])*  impl < 'a ,  P >  Clone  for $forward_iterator < 'a ,  P >  where  P :  Pattern < 'a ,  Searcher :  Clone >, { fn  clone (&  self )->  Self {$forward_iterator ( self .  0 .  clone ())}}$(# [$reverse_iterator_attribute ])* $(# [$common_stability_attribute ])*  pub  struct $reverse_iterator < 'a ,  P :  Pattern < 'a >> ( pub ( super )$internal_iterator < 'a ,  P >); $(# [$common_stability_attribute ])*  impl < 'a ,  P >  fmt ::  Debug  for $reverse_iterator < 'a ,  P >  where  P :  Pattern < 'a ,  Searcher :  fmt ::  Debug >, { fn  fmt (&  self ,  f : &  mut  fmt ::  Formatter < '_ >)->  fmt ::  Result { f .  debug_tuple ( stringify ! ($reverse_iterator )).  field (&  self .  0 ).  finish ()}}$(# [$common_stability_attribute ])*  impl < 'a ,  P >  Iterator  for $reverse_iterator < 'a ,  P >  where  P :  Pattern < 'a ,  Searcher :  ReverseSearcher < 'a >>, { type  Item = $iterty ; # [ inline ] fn  next (&  mut  self )->  Option <$iterty > { self .  0 .  next_back ()}}$(# [$common_stability_attribute ])*  impl < 'a ,  P >  Clone  for $reverse_iterator < 'a ,  P >  where  P :  Pattern < 'a ,  Searcher :  Clone >, { fn  clone (&  self )->  Self {$reverse_iterator ( self .  0 .  clone ())}}# [ stable ( feature =  "fused" ,  since =  "1.26.0" )] impl < 'a ,  P :  Pattern < 'a >>  FusedIterator  for $forward_iterator < 'a ,  P > {}# [ stable ( feature =  "fused" ,  since =  "1.26.0" )] impl < 'a ,  P >  FusedIterator  for $reverse_iterator < 'a ,  P >  where  P :  Pattern < 'a ,  Searcher :  ReverseSearcher < 'a >>, {} generate_pattern_iterators ! ($($t )*  with $(# [$common_stability_attribute ])*, $forward_iterator , $reverse_iterator , $iterty ); }; { double  ended ;  with $(# [$common_stability_attribute :  meta ])*, $forward_iterator :  ident , $reverse_iterator :  ident , $iterty :  ty }=>{$(# [$common_stability_attribute ])*  impl < 'a ,  P >  DoubleEndedIterator  for $forward_iterator < 'a ,  P >  where  P :  Pattern < 'a ,  Searcher :  DoubleEndedSearcher < 'a >>, {# [ inline ] fn  next_back (&  mut  self )->  Option <$iterty > { self .  0 .  next_back ()}}$(# [$common_stability_attribute ])*  impl < 'a ,  P >  DoubleEndedIterator  for $reverse_iterator < 'a ,  P >  where  P :  Pattern < 'a ,  Searcher :  DoubleEndedSearcher < 'a >>, {# [ inline ] fn  next_back (&  mut  self )->  Option <$iterty > { self .  0 .  next ()}}}; { single  ended ;  with $(# [$common_stability_attribute :  meta ])*, $forward_iterator :  ident , $reverse_iterator :  ident , $iterty :  ty }=>{}}
+macro_rules! __ra_macro_fixture84 {($($Name :  ident ),+)=>{$(# [ stable ( feature =  "str_escape" ,  since =  "1.34.0" )] impl < 'a >  fmt ::  Display  for $Name < 'a > { fn  fmt (&  self ,  f : &  mut  fmt ::  Formatter < '_ >)->  fmt ::  Result { self .  clone ().  try_for_each (|  c |  f .  write_char ( c ))}}# [ stable ( feature =  "str_escape" ,  since =  "1.34.0" )] impl < 'a >  Iterator  for $Name < 'a > { type  Item =  char ; # [ inline ] fn  next (&  mut  self )->  Option <  char > { self .  inner .  next ()}# [ inline ] fn  size_hint (&  self )-> ( usize ,  Option <  usize >){ self .  inner .  size_hint ()}# [ inline ] fn  try_fold <  Acc ,  Fold ,  R > (&  mut  self ,  init :  Acc ,  fold :  Fold )->  R  where  Self :  Sized ,  Fold :  FnMut ( Acc ,  Self ::  Item )->  R ,  R :  Try <  Ok =  Acc >{ self .  inner .  try_fold ( init ,  fold )}# [ inline ] fn  fold <  Acc ,  Fold > ( self ,  init :  Acc ,  fold :  Fold )->  Acc  where  Fold :  FnMut ( Acc ,  Self ::  Item )->  Acc , { self .  inner .  fold ( init ,  fold )}}# [ stable ( feature =  "str_escape" ,  since =  "1.34.0" )] impl < 'a >  FusedIterator  for $Name < 'a > {})+}}
+macro_rules! __ra_macro_fixture85 {($($(# [$attr :  meta ])*  struct $Name :  ident  impl $(<$($lifetime :  lifetime ),+> )?  Fn = |$($arg :  ident : $ArgTy :  ty ),*| -> $ReturnTy :  ty $body :  block ; )+)=>{$($(# [$attr ])*  struct $Name ;  impl $(<$($lifetime ),+> )?  Fn < ($($ArgTy , )*)>  for $Name {# [ inline ] extern  "rust-call"  fn  call (&  self , ($($arg , )*): ($($ArgTy , )*))-> $ReturnTy {$body }} impl $(<$($lifetime ),+> )?  FnMut < ($($ArgTy , )*)>  for $Name {# [ inline ] extern  "rust-call"  fn  call_mut (&  mut  self , ($($arg , )*): ($($ArgTy , )*))-> $ReturnTy { Fn ::  call (&*  self , ($($arg , )*))}} impl $(<$($lifetime ),+> )?  FnOnce < ($($ArgTy , )*)>  for $Name { type  Output = $ReturnTy ; # [ inline ] extern  "rust-call"  fn  call_once ( self , ($($arg , )*): ($($ArgTy , )*))-> $ReturnTy { Fn ::  call (&  self , ($($arg , )*))}})+ }}
+macro_rules! __ra_macro_fixture86 {($($Tuple :  ident {$(($idx :  tt )-> $T :  ident )+ })+)=>{$(# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl <$($T :  PartialEq ),+>  PartialEq  for ($($T ,)+) where  last_type ! ($($T ,)+): ?  Sized {# [ inline ] fn  eq (&  self ,  other : & ($($T ,)+))->  bool {$(self .$idx ==  other .$idx )&&+ }# [ inline ] fn  ne (&  self ,  other : & ($($T ,)+))->  bool {$(self .$idx !=  other .$idx )||+ }}# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl <$($T :  Eq ),+>  Eq  for ($($T ,)+) where  last_type ! ($($T ,)+): ?  Sized {}# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl <$($T :  PartialOrd +  PartialEq ),+>  PartialOrd  for ($($T ,)+) where  last_type ! ($($T ,)+): ?  Sized {# [ inline ] fn  partial_cmp (&  self ,  other : & ($($T ,)+))->  Option <  Ordering > { lexical_partial_cmp ! ($(self .$idx ,  other .$idx ),+)}# [ inline ] fn  lt (&  self ,  other : & ($($T ,)+))->  bool { lexical_ord ! ( lt , $(self .$idx ,  other .$idx ),+)}# [ inline ] fn  le (&  self ,  other : & ($($T ,)+))->  bool { lexical_ord ! ( le , $(self .$idx ,  other .$idx ),+)}# [ inline ] fn  ge (&  self ,  other : & ($($T ,)+))->  bool { lexical_ord ! ( ge , $(self .$idx ,  other .$idx ),+)}# [ inline ] fn  gt (&  self ,  other : & ($($T ,)+))->  bool { lexical_ord ! ( gt , $(self .$idx ,  other .$idx ),+)}}# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl <$($T :  Ord ),+>  Ord  for ($($T ,)+) where  last_type ! ($($T ,)+): ?  Sized {# [ inline ] fn  cmp (&  self ,  other : & ($($T ,)+))->  Ordering { lexical_cmp ! ($(self .$idx ,  other .$idx ),+)}}# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl <$($T :  Default ),+>  Default  for ($($T ,)+){# [ inline ] fn  default ()-> ($($T ,)+){($({let  x : $T =  Default ::  default ();  x },)+)}})+ }}
+macro_rules! __ra_macro_fixture87 {($x :  expr , $($tt :  tt )*)=>{# [ doc = $x ]$($tt )* }; }
+macro_rules! __ra_macro_fixture88 {($x :  expr , $($tt :  tt )*)=>{# [ doc = $x ]$($tt )* }; }
+macro_rules! __ra_macro_fixture89 {(# [$stability :  meta ]($($Trait :  ident ),+ ) for $Ty :  ident )=>{$(# [$stability ] impl  fmt ::$Trait  for $Ty {# [ inline ] fn  fmt (&  self ,  f : &  mut  fmt ::  Formatter < '_ >)->  fmt ::  Result { self .  get ().  fmt ( f )}})+ }}
+macro_rules! __ra_macro_fixture90 {($t :  ident , $f :  ident )=>{# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  Shl <$f >  for  Wrapping <$t > { type  Output =  Wrapping <$t >; # [ inline ] fn  shl ( self ,  other : $f )->  Wrapping <$t > { Wrapping ( self .  0 .  wrapping_shl (( other &  self ::  shift_max ::$t  as $f ) as  u32 ))}} forward_ref_binop ! { impl  Shl ,  shl  for  Wrapping <$t >, $f , # [ stable ( feature =  "wrapping_ref_ops" ,  since =  "1.39.0" )]}# [ stable ( feature =  "op_assign_traits" ,  since =  "1.8.0" )] impl  ShlAssign <$f >  for  Wrapping <$t > {# [ inline ] fn  shl_assign (&  mut  self ,  other : $f ){*  self = *  self <<  other ; }} forward_ref_op_assign ! { impl  ShlAssign ,  shl_assign  for  Wrapping <$t >, $f }# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  Shr <$f >  for  Wrapping <$t > { type  Output =  Wrapping <$t >; # [ inline ] fn  shr ( self ,  other : $f )->  Wrapping <$t > { Wrapping ( self .  0 .  wrapping_shr (( other &  self ::  shift_max ::$t  as $f ) as  u32 ))}} forward_ref_binop ! { impl  Shr ,  shr  for  Wrapping <$t >, $f , # [ stable ( feature =  "wrapping_ref_ops" ,  since =  "1.39.0" )]}# [ stable ( feature =  "op_assign_traits" ,  since =  "1.8.0" )] impl  ShrAssign <$f >  for  Wrapping <$t > {# [ inline ] fn  shr_assign (&  mut  self ,  other : $f ){*  self = *  self >>  other ; }} forward_ref_op_assign ! { impl  ShrAssign ,  shr_assign  for  Wrapping <$t >, $f }}; }
+macro_rules! __ra_macro_fixture91 {( impl $imp :  ident , $method :  ident  for $t :  ty , $u :  ty )=>{ forward_ref_binop ! ( impl $imp , $method  for $t , $u , # [ stable ( feature =  "rust1" ,  since =  "1.0.0" )]); }; ( impl $imp :  ident , $method :  ident  for $t :  ty , $u :  ty , # [$attr :  meta ])=>{# [$attr ] impl < 'a > $imp <$u >  for & 'a $t { type  Output = <$t  as $imp <$u >>::  Output ; # [ inline ] fn $method ( self ,  other : $u )-> <$t  as $imp <$u >>::  Output {$imp ::$method (*  self ,  other )}}# [$attr ] impl $imp <&$u >  for $t { type  Output = <$t  as $imp <$u >>::  Output ; # [ inline ] fn $method ( self ,  other : &$u )-> <$t  as $imp <$u >>::  Output {$imp ::$method ( self , *  other )}}# [$attr ] impl $imp <&$u >  for &$t { type  Output = <$t  as $imp <$u >>::  Output ; # [ inline ] fn $method ( self ,  other : &$u )-> <$t  as $imp <$u >>::  Output {$imp ::$method (*  self , *  other )}}}}
+macro_rules! __ra_macro_fixture92 {( impl $imp :  ident , $method :  ident  for $t :  ty , $u :  ty )=>{ forward_ref_op_assign ! ( impl $imp , $method  for $t , $u , # [ stable ( feature =  "op_assign_builtins_by_ref" ,  since =  "1.22.0" )]); }; ( impl $imp :  ident , $method :  ident  for $t :  ty , $u :  ty , # [$attr :  meta ])=>{# [$attr ] impl $imp <&$u >  for $t {# [ inline ] fn $method (&  mut  self ,  other : &$u ){$imp ::$method ( self , *  other ); }}}}
+macro_rules! __ra_macro_fixture93 {( impl $imp :  ident , $method :  ident  for $t :  ty )=>{ forward_ref_unop ! ( impl $imp , $method  for $t , # [ stable ( feature =  "rust1" ,  since =  "1.0.0" )]); }; ( impl $imp :  ident , $method :  ident  for $t :  ty , # [$attr :  meta ])=>{# [$attr ] impl $imp  for &$t { type  Output = <$t  as $imp >::  Output ; # [ inline ] fn $method ( self )-> <$t  as $imp >::  Output {$imp ::$method (*  self )}}}}
+macro_rules! __ra_macro_fixture94 {($FnTy :  ty , $($Arg :  ident ),*)=>{# [ stable ( feature =  "fnptr_impls" ,  since =  "1.4.0" )] impl <  Ret , $($Arg ),*>  PartialEq  for $FnTy {# [ inline ] fn  eq (&  self ,  other : &  Self )->  bool {*  self  as  usize == *  other  as  usize }}# [ stable ( feature =  "fnptr_impls" ,  since =  "1.4.0" )] impl <  Ret , $($Arg ),*>  Eq  for $FnTy {}# [ stable ( feature =  "fnptr_impls" ,  since =  "1.4.0" )] impl <  Ret , $($Arg ),*>  PartialOrd  for $FnTy {# [ inline ] fn  partial_cmp (&  self ,  other : &  Self )->  Option <  Ordering > {(*  self  as  usize ).  partial_cmp (& (*  other  as  usize ))}}# [ stable ( feature =  "fnptr_impls" ,  since =  "1.4.0" )] impl <  Ret , $($Arg ),*>  Ord  for $FnTy {# [ inline ] fn  cmp (&  self ,  other : &  Self )->  Ordering {(*  self  as  usize ).  cmp (& (*  other  as  usize ))}}# [ stable ( feature =  "fnptr_impls" ,  since =  "1.4.0" )] impl <  Ret , $($Arg ),*>  hash ::  Hash  for $FnTy { fn  hash <  HH :  hash ::  Hasher > (&  self ,  state : &  mut  HH ){ state .  write_usize (*  self  as  usize )}}# [ stable ( feature =  "fnptr_impls" ,  since =  "1.4.0" )] impl <  Ret , $($Arg ),*>  fmt ::  Pointer  for $FnTy { fn  fmt (&  self ,  f : &  mut  fmt ::  Formatter < '_ >)->  fmt ::  Result { fmt ::  Pointer ::  fmt (& (*  self  as  usize  as *  const ()),  f )}}# [ stable ( feature =  "fnptr_impls" ,  since =  "1.4.0" )] impl <  Ret , $($Arg ),*>  fmt ::  Debug  for $FnTy { fn  fmt (&  self ,  f : &  mut  fmt ::  Formatter < '_ >)->  fmt ::  Result { fmt ::  Pointer ::  fmt (& (*  self  as  usize  as *  const ()),  f )}}}}
+macro_rules! __ra_macro_fixture95 {($t :  ty , $f :  ty )=>{# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  Shl <$f >  for $t { type  Output = $t ; # [ inline ]# [ rustc_inherit_overflow_checks ] fn  shl ( self ,  other : $f )-> $t { self <<  other }} forward_ref_binop ! { impl  Shl ,  shl  for $t , $f }}; }
+macro_rules! __ra_macro_fixture96 {($t :  ty , $f :  ty )=>{# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  Shr <$f >  for $t { type  Output = $t ; # [ inline ]# [ rustc_inherit_overflow_checks ] fn  shr ( self ,  other : $f )-> $t { self >>  other }} forward_ref_binop ! { impl  Shr ,  shr  for $t , $f }}; }
+macro_rules! __ra_macro_fixture97 {($t :  ty , $f :  ty )=>{# [ stable ( feature =  "op_assign_traits" ,  since =  "1.8.0" )] impl  ShlAssign <$f >  for $t {# [ inline ]# [ rustc_inherit_overflow_checks ] fn  shl_assign (&  mut  self ,  other : $f ){*  self <<=  other }} forward_ref_op_assign ! { impl  ShlAssign ,  shl_assign  for $t , $f }}; }
+macro_rules! __ra_macro_fixture98 {($t :  ty , $f :  ty )=>{# [ stable ( feature =  "op_assign_traits" ,  since =  "1.8.0" )] impl  ShrAssign <$f >  for $t {# [ inline ]# [ rustc_inherit_overflow_checks ] fn  shr_assign (&  mut  self ,  other : $f ){*  self >>=  other }} forward_ref_op_assign ! { impl  ShrAssign ,  shr_assign  for $t , $f }}; }
+macro_rules! __ra_macro_fixture99 {( fmt ::$Trait :  ident  for $T :  ident  as $U :  ident -> $Radix :  ident )=>{# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )] impl  fmt ::$Trait  for $T { fn  fmt (&  self ,  f : &  mut  fmt ::  Formatter < '_ >)->  fmt ::  Result {$Radix .  fmt_int (*  self  as $U ,  f )}}}; }
+macro_rules! __ra_macro_fixture100 {($name :  ident , $($other :  ident ,)*)=>( tuple ! {$($other ,)* })}
+macro_rules! __ra_macro_fixture101 {{ unsafe  fn $name :  ident : $adjacent_kv :  ident }=>{# [ doc =  " Given a leaf edge handle into an owned tree, returns a handle to the next KV," ]# [ doc =  " while deallocating any node left behind yet leaving the corresponding edge" ]# [ doc =  " in its parent node dangling." ]# [ doc =  "" ]# [ doc =  " # Safety" ]# [ doc =  " - The leaf edge must not be the last one in the direction travelled." ]# [ doc =  " - The node carrying the next KV returned must not have been deallocated by a" ]# [ doc =  "   previous call on any handle obtained for this tree." ] unsafe  fn $name <  K ,  V > ( leaf_edge :  Handle <  NodeRef <  marker ::  Owned ,  K ,  V ,  marker ::  Leaf >,  marker ::  Edge >, )->  Handle <  NodeRef <  marker ::  Owned ,  K ,  V ,  marker ::  LeafOrInternal >,  marker ::  KV > { let  mut  edge =  leaf_edge .  forget_node_type ();  loop { edge =  match  edge .$adjacent_kv (){ Ok ( internal_kv )=> return  internal_kv ,  Err ( last_edge )=>{ unsafe { let  parent_edge =  last_edge .  into_node ().  deallocate_and_ascend ();  unwrap_unchecked ( parent_edge ).  forget_node_type ()}}}}}}; }
+macro_rules! __ra_macro_fixture102 {([$($vars :  tt )*]$lhs :  ty , $rhs :  ty , $($constraints :  tt )*)=>{# [ stable ( feature =  "vec_deque_partial_eq_slice" ,  since =  "1.17.0" )] impl <  A ,  B , $($vars )*>  PartialEq <$rhs >  for $lhs  where  A :  PartialEq <  B >, $($constraints )* { fn  eq (&  self ,  other : &$rhs )->  bool { if  self .  len ()!=  other .  len (){ return  false ; } let ( sa ,  sb )=  self .  as_slices ();  let ( oa ,  ob )=  other [..].  split_at ( sa .  len ());  sa ==  oa &&  sb ==  ob }}}}
+macro_rules! __ra_macro_fixture103 {($lhs :  ty , $rhs :  ty )=>{# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )]# [ allow ( unused_lifetimes )] impl < 'a , 'b >  PartialEq <$rhs >  for $lhs {# [ inline ] fn  eq (&  self ,  other : &$rhs )->  bool { PartialEq ::  eq (&  self [..], &  other [..])}# [ inline ] fn  ne (&  self ,  other : &$rhs )->  bool { PartialEq ::  ne (&  self [..], &  other [..])}}# [ stable ( feature =  "rust1" ,  since =  "1.0.0" )]# [ allow ( unused_lifetimes )] impl < 'a , 'b >  PartialEq <$lhs >  for $rhs {# [ inline ] fn  eq (&  self ,  other : &$lhs )->  bool { PartialEq ::  eq (&  self [..], &  other [..])}# [ inline ] fn  ne (&  self ,  other : &$lhs )->  bool { PartialEq ::  ne (&  self [..], &  other [..])}}}; }
+macro_rules! __ra_macro_fixture104 {($t :  ty , $is_zero :  expr )=>{ unsafe  impl  IsZero  for $t {# [ inline ] fn  is_zero (&  self )->  bool {$is_zero (*  self )}}}; }
+macro_rules! __ra_macro_fixture105 {([$($vars :  tt )*]$lhs :  ty , $rhs :  ty $(where $ty :  ty : $bound :  ident )?, # [$stability :  meta ])=>{# [$stability ] impl <  A ,  B , $($vars )*>  PartialEq <$rhs >  for $lhs  where  A :  PartialEq <  B >, $($ty : $bound )? {# [ inline ] fn  eq (&  self ,  other : &$rhs )->  bool { self [..]==  other [..]}# [ inline ] fn  ne (&  self ,  other : &$rhs )->  bool { self [..]!=  other [..]}}}}
+macro_rules! __ra_macro_fixture106 {('owned : $($oty :  ident ,)* 'interned : $($ity :  ident ,)* )=>{# [ repr ( C )]# [ allow ( non_snake_case )] pub  struct  HandleCounters {$($oty :  AtomicUsize ,)* $($ity :  AtomicUsize ,)* } impl  HandleCounters { extern  "C"  fn  get ()-> & 'static  Self { static  COUNTERS :  HandleCounters =  HandleCounters {$($oty :  AtomicUsize ::  new ( 1 ),)* $($ity :  AtomicUsize ::  new ( 1 ),)* }; &  COUNTERS }}# [ repr ( C )]# [ allow ( non_snake_case )] pub ( super ) struct  HandleStore <  S :  server ::  Types > {$($oty :  handle ::  OwnedStore <  S ::$oty >,)* $($ity :  handle ::  InternedStore <  S ::$ity >,)* } impl <  S :  server ::  Types >  HandleStore <  S > { pub ( super ) fn  new ( handle_counters : & 'static  HandleCounters )->  Self { HandleStore {$($oty :  handle ::  OwnedStore ::  new (&  handle_counters .$oty ),)* $($ity :  handle ::  InternedStore ::  new (&  handle_counters .$ity ),)* }}}$(# [ repr ( C )] pub ( crate ) struct $oty ( handle ::  Handle );  impl !  Send  for $oty {} impl !  Sync  for $oty {} impl  Drop  for $oty { fn  drop (&  mut  self ){$oty ( self .  0 ).  drop (); }} impl <  S >  Encode <  S >  for $oty { fn  encode ( self ,  w : &  mut  Writer ,  s : &  mut  S ){ let  handle =  self .  0 ;  mem ::  forget ( self );  handle .  encode ( w ,  s ); }} impl <  S :  server ::  Types >  DecodeMut < '_ , '_ ,  HandleStore <  server ::  MarkedTypes <  S >>>  for  Marked <  S ::$oty , $oty > { fn  decode ( r : &  mut  Reader < '_ >,  s : &  mut  HandleStore <  server ::  MarkedTypes <  S >>)->  Self { s .$oty .  take ( handle ::  Handle ::  decode ( r , &  mut ()))}} impl <  S >  Encode <  S >  for &$oty { fn  encode ( self ,  w : &  mut  Writer ,  s : &  mut  S ){ self .  0 .  encode ( w ,  s ); }} impl <  S :  server ::  Types >  Decode < '_ , 's ,  HandleStore <  server ::  MarkedTypes <  S >>>  for & 's  Marked <  S ::$oty , $oty > { fn  decode ( r : &  mut  Reader < '_ >,  s : & 's  HandleStore <  server ::  MarkedTypes <  S >>)->  Self {&  s .$oty [ handle ::  Handle ::  decode ( r , &  mut ())]}} impl <  S >  Encode <  S >  for &  mut $oty { fn  encode ( self ,  w : &  mut  Writer ,  s : &  mut  S ){ self .  0 .  encode ( w ,  s ); }} impl <  S :  server ::  Types >  DecodeMut < '_ , 's ,  HandleStore <  server ::  MarkedTypes <  S >>>  for & 's  mut  Marked <  S ::$oty , $oty > { fn  decode ( r : &  mut  Reader < '_ >,  s : & 's  mut  HandleStore <  server ::  MarkedTypes <  S >> )->  Self {&  mut  s .$oty [ handle ::  Handle ::  decode ( r , &  mut ())]}} impl <  S :  server ::  Types >  Encode <  HandleStore <  server ::  MarkedTypes <  S >>>  for  Marked <  S ::$oty , $oty > { fn  encode ( self ,  w : &  mut  Writer ,  s : &  mut  HandleStore <  server ::  MarkedTypes <  S >>){ s .$oty .  alloc ( self ).  encode ( w ,  s ); }} impl <  S >  DecodeMut < '_ , '_ ,  S >  for $oty { fn  decode ( r : &  mut  Reader < '_ >,  s : &  mut  S )->  Self {$oty ( handle ::  Handle ::  decode ( r ,  s ))}})* $(# [ repr ( C )]# [ derive ( Copy ,  Clone ,  PartialEq ,  Eq ,  Hash )] pub ( crate ) struct $ity ( handle ::  Handle );  impl !  Send  for $ity {} impl !  Sync  for $ity {} impl <  S >  Encode <  S >  for $ity { fn  encode ( self ,  w : &  mut  Writer ,  s : &  mut  S ){ self .  0 .  encode ( w ,  s ); }} impl <  S :  server ::  Types >  DecodeMut < '_ , '_ ,  HandleStore <  server ::  MarkedTypes <  S >>>  for  Marked <  S ::$ity , $ity > { fn  decode ( r : &  mut  Reader < '_ >,  s : &  mut  HandleStore <  server ::  MarkedTypes <  S >>)->  Self { s .$ity .  copy ( handle ::  Handle ::  decode ( r , &  mut ()))}} impl <  S :  server ::  Types >  Encode <  HandleStore <  server ::  MarkedTypes <  S >>>  for  Marked <  S ::$ity , $ity > { fn  encode ( self ,  w : &  mut  Writer ,  s : &  mut  HandleStore <  server ::  MarkedTypes <  S >>){ s .$ity .  alloc ( self ).  encode ( w ,  s ); }} impl <  S >  DecodeMut < '_ , '_ ,  S >  for $ity { fn  decode ( r : &  mut  Reader < '_ >,  s : &  mut  S )->  Self {$ity ( handle ::  Handle ::  decode ( r ,  s ))}})* }}
+macro_rules! __ra_macro_fixture107 {($S :  ident , $self :  ident , $m :  ident )=>{$m ! { FreeFunctions { fn  drop ($self : $S ::  FreeFunctions );  fn  track_env_var ( var : &  str ,  value :  Option <&  str >); },  TokenStream { fn  drop ($self : $S ::  TokenStream );  fn  clone ($self : &$S ::  TokenStream )-> $S ::  TokenStream ;  fn  new ()-> $S ::  TokenStream ;  fn  is_empty ($self : &$S ::  TokenStream )->  bool ;  fn  from_str ( src : &  str )-> $S ::  TokenStream ;  fn  to_string ($self : &$S ::  TokenStream )->  String ;  fn  from_token_tree ( tree :  TokenTree <$S ::  Group , $S ::  Punct , $S ::  Ident , $S ::  Literal >, )-> $S ::  TokenStream ;  fn  into_iter ($self : $S ::  TokenStream )-> $S ::  TokenStreamIter ; },  TokenStreamBuilder { fn  drop ($self : $S ::  TokenStreamBuilder );  fn  new ()-> $S ::  TokenStreamBuilder ;  fn  push ($self : &  mut $S ::  TokenStreamBuilder ,  stream : $S ::  TokenStream );  fn  build ($self : $S ::  TokenStreamBuilder )-> $S ::  TokenStream ; },  TokenStreamIter { fn  drop ($self : $S ::  TokenStreamIter );  fn  clone ($self : &$S ::  TokenStreamIter )-> $S ::  TokenStreamIter ;  fn  next ($self : &  mut $S ::  TokenStreamIter , )->  Option <  TokenTree <$S ::  Group , $S ::  Punct , $S ::  Ident , $S ::  Literal >>; },  Group { fn  drop ($self : $S ::  Group );  fn  clone ($self : &$S ::  Group )-> $S ::  Group ;  fn  new ( delimiter :  Delimiter ,  stream : $S ::  TokenStream )-> $S ::  Group ;  fn  delimiter ($self : &$S ::  Group )->  Delimiter ;  fn  stream ($self : &$S ::  Group )-> $S ::  TokenStream ;  fn  span ($self : &$S ::  Group )-> $S ::  Span ;  fn  span_open ($self : &$S ::  Group )-> $S ::  Span ;  fn  span_close ($self : &$S ::  Group )-> $S ::  Span ;  fn  set_span ($self : &  mut $S ::  Group ,  span : $S ::  Span ); },  Punct { fn  new ( ch :  char ,  spacing :  Spacing )-> $S ::  Punct ;  fn  as_char ($self : $S ::  Punct )->  char ;  fn  spacing ($self : $S ::  Punct )->  Spacing ;  fn  span ($self : $S ::  Punct )-> $S ::  Span ;  fn  with_span ($self : $S ::  Punct ,  span : $S ::  Span )-> $S ::  Punct ; },  Ident { fn  new ( string : &  str ,  span : $S ::  Span ,  is_raw :  bool )-> $S ::  Ident ;  fn  span ($self : $S ::  Ident )-> $S ::  Span ;  fn  with_span ($self : $S ::  Ident ,  span : $S ::  Span )-> $S ::  Ident ; },  Literal { fn  drop ($self : $S ::  Literal );  fn  clone ($self : &$S ::  Literal )-> $S ::  Literal ;  fn  debug_kind ($self : &$S ::  Literal )->  String ;  fn  symbol ($self : &$S ::  Literal )->  String ;  fn  suffix ($self : &$S ::  Literal )->  Option <  String >;  fn  integer ( n : &  str )-> $S ::  Literal ;  fn  typed_integer ( n : &  str ,  kind : &  str )-> $S ::  Literal ;  fn  float ( n : &  str )-> $S ::  Literal ;  fn  f32 ( n : &  str )-> $S ::  Literal ;  fn  f64 ( n : &  str )-> $S ::  Literal ;  fn  string ( string : &  str )-> $S ::  Literal ;  fn  character ( ch :  char )-> $S ::  Literal ;  fn  byte_string ( bytes : & [ u8 ])-> $S ::  Literal ;  fn  span ($self : &$S ::  Literal )-> $S ::  Span ;  fn  set_span ($self : &  mut $S ::  Literal ,  span : $S ::  Span );  fn  subspan ($self : &$S ::  Literal ,  start :  Bound <  usize >,  end :  Bound <  usize >, )->  Option <$S ::  Span >; },  SourceFile { fn  drop ($self : $S ::  SourceFile );  fn  clone ($self : &$S ::  SourceFile )-> $S ::  SourceFile ;  fn  eq ($self : &$S ::  SourceFile ,  other : &$S ::  SourceFile )->  bool ;  fn  path ($self : &$S ::  SourceFile )->  String ;  fn  is_real ($self : &$S ::  SourceFile )->  bool ; },  MultiSpan { fn  drop ($self : $S ::  MultiSpan );  fn  new ()-> $S ::  MultiSpan ;  fn  push ($self : &  mut $S ::  MultiSpan ,  span : $S ::  Span ); },  Diagnostic { fn  drop ($self : $S ::  Diagnostic );  fn  new ( level :  Level ,  msg : &  str ,  span : $S ::  MultiSpan )-> $S ::  Diagnostic ;  fn  sub ($self : &  mut $S ::  Diagnostic ,  level :  Level ,  msg : &  str ,  span : $S ::  MultiSpan , );  fn  emit ($self : $S ::  Diagnostic ); },  Span { fn  debug ($self : $S ::  Span )->  String ;  fn  def_site ()-> $S ::  Span ;  fn  call_site ()-> $S ::  Span ;  fn  mixed_site ()-> $S ::  Span ;  fn  source_file ($self : $S ::  Span )-> $S ::  SourceFile ;  fn  parent ($self : $S ::  Span )->  Option <$S ::  Span >;  fn  source ($self : $S ::  Span )-> $S ::  Span ;  fn  start ($self : $S ::  Span )->  LineColumn ;  fn  end ($self : $S ::  Span )->  LineColumn ;  fn  join ($self : $S ::  Span ,  other : $S ::  Span )->  Option <$S ::  Span >;  fn  resolved_at ($self : $S ::  Span ,  at : $S ::  Span )-> $S ::  Span ;  fn  source_text ($self : $S ::  Span )->  Option <  String >; }, }}; }
+macro_rules! __ra_macro_fixture108 {( le $ty :  ty )=>{ impl <  S >  Encode <  S >  for $ty { fn  encode ( self ,  w : &  mut  Writer , _: &  mut  S ){ w .  write_all (&  self .  to_le_bytes ()).  unwrap (); }} impl <  S >  DecodeMut < '_ , '_ ,  S >  for $ty { fn  decode ( r : &  mut  Reader < '_ >, _: &  mut  S )->  Self { const  N :  usize = ::  std ::  mem ::  size_of ::<$ty > ();  let  mut  bytes = [ 0 ;  N ];  bytes .  copy_from_slice (&  r [..  N ]); *  r = &  r [ N ..];  Self ::  from_le_bytes ( bytes )}}}; ( struct $name :  ident {$($field :  ident ),* $(,)? })=>{ impl <  S >  Encode <  S >  for $name { fn  encode ( self ,  w : &  mut  Writer ,  s : &  mut  S ){$(self .$field .  encode ( w ,  s );)* }} impl <  S >  DecodeMut < '_ , '_ ,  S >  for $name { fn  decode ( r : &  mut  Reader < '_ >,  s : &  mut  S )->  Self {$name {$($field :  DecodeMut ::  decode ( r ,  s )),* }}}}; ( enum $name :  ident $(<$($T :  ident ),+>)? {$($variant :  ident $(($field :  ident ))*),* $(,)? })=>{ impl <  S , $($($T :  Encode <  S >),+)?>  Encode <  S >  for $name $(<$($T ),+>)? { fn  encode ( self ,  w : &  mut  Writer ,  s : &  mut  S ){# [ allow ( non_upper_case_globals )] mod  tag {# [ repr ( u8 )] enum  Tag {$($variant ),* }$(pub  const $variant :  u8 =  Tag ::$variant  as  u8 ;)* } match  self {$($name ::$variant $(($field ))* =>{ tag ::$variant .  encode ( w ,  s ); $($field .  encode ( w ,  s );)* })* }}} impl <  S , $($($T :  for < 's >  DecodeMut < 'a , 's ,  S >),+)?>  DecodeMut < 'a , '_ ,  S >  for $name $(<$($T ),+>)? { fn  decode ( r : &  mut  Reader < 'a >,  s : &  mut  S )->  Self {# [ allow ( non_upper_case_globals )] mod  tag {# [ repr ( u8 )] enum  Tag {$($variant ),* }$(pub  const $variant :  u8 =  Tag ::$variant  as  u8 ;)* } match  u8 ::  decode ( r ,  s ){$(tag ::$variant =>{$(let $field =  DecodeMut ::  decode ( r ,  s );)* $name ::$variant $(($field ))* })* _ => unreachable ! (), }}}}}
+macro_rules! __ra_macro_fixture109 {($($ty :  ty ),* $(,)?)=>{$(impl  Mark  for $ty { type  Unmarked =  Self ;  fn  mark ( unmarked :  Self ::  Unmarked )->  Self { unmarked }} impl  Unmark  for $ty { type  Unmarked =  Self ;  fn  unmark ( self )->  Self ::  Unmarked { self }})* }}
+macro_rules! __ra_macro_fixture110 {($($name :  ident {$(fn $method :  ident ($($arg :  ident : $arg_ty :  ty ),* $(,)?)$(-> $ret_ty :  ty )*;)* }),* $(,)?)=>{$(impl $name {$(pub ( crate ) fn $method ($($arg : $arg_ty ),*)$(-> $ret_ty )* { Bridge ::  with (|  bridge | { let  mut  b =  bridge .  cached_buffer .  take ();  b .  clear ();  api_tags ::  Method ::$name ( api_tags ::$name ::$method ).  encode (&  mut  b , &  mut ());  reverse_encode ! ( b ; $($arg ),*);  b =  bridge .  dispatch .  call ( b );  let  r =  Result ::<_,  PanicMessage >::  decode (&  mut &  b [..], &  mut ());  bridge .  cached_buffer =  b ;  r .  unwrap_or_else (|  e |  panic ::  resume_unwind ( e .  into ()))})})* })* }}
+macro_rules! __ra_macro_fixture111 {($($name :  ident {$(fn $method :  ident ($($arg :  ident : $arg_ty :  ty ),* $(,)?)$(-> $ret_ty :  ty )?;)* }),* $(,)?)=>{ pub  trait  Types {$(associated_item ! ( type $name );)* }$(pub  trait $name :  Types {$(associated_item ! ( fn $method (&  mut  self , $($arg : $arg_ty ),*)$(-> $ret_ty )?);)* })*  pub  trait  Server :  Types $(+ $name )* {} impl <  S :  Types $(+ $name )*>  Server  for  S {}}}
+macro_rules! __ra_macro_fixture112 {($($name :  ident {$(fn $method :  ident ($($arg :  ident : $arg_ty :  ty ),* $(,)?)$(-> $ret_ty :  ty )?;)* }),* $(,)?)=>{ impl <  S :  Types >  Types  for  MarkedTypes <  S > {$(type $name =  Marked <  S ::$name ,  client ::$name >;)* }$(impl <  S : $name > $name  for  MarkedTypes <  S > {$(fn $method (&  mut  self , $($arg : $arg_ty ),*)$(-> $ret_ty )? {<_>::  mark ($name ::$method (&  mut  self .  0 , $($arg .  unmark ()),*))})* })* }}
+macro_rules! __ra_macro_fixture113 {($($name :  ident {$(fn $method :  ident ($($arg :  ident : $arg_ty :  ty ),* $(,)?)$(-> $ret_ty :  ty )?;)* }),* $(,)?)=>{ pub  trait  DispatcherTrait {$(type $name ;)*  fn  dispatch (&  mut  self ,  b :  Buffer <  u8 >)->  Buffer <  u8 >; } impl <  S :  Server >  DispatcherTrait  for  Dispatcher <  MarkedTypes <  S >> {$(type $name = <  MarkedTypes <  S >  as  Types >::$name ;)*  fn  dispatch (&  mut  self ,  mut  b :  Buffer <  u8 >)->  Buffer <  u8 > { let  Dispatcher { handle_store ,  server }=  self ;  let  mut  reader = &  b [..];  match  api_tags ::  Method ::  decode (&  mut  reader , &  mut ()){$(api_tags ::  Method ::$name ( m )=> match  m {$(api_tags ::$name ::$method =>{ let  mut  call_method = || { reverse_decode ! ( reader ,  handle_store ; $($arg : $arg_ty ),*); $name ::$method ( server , $($arg ),*)};  let  r =  if  thread ::  panicking (){ Ok ( call_method ())} else { panic ::  catch_unwind ( panic ::  AssertUnwindSafe ( call_method )).  map_err ( PanicMessage ::  from )};  b .  clear ();  r .  encode (&  mut  b ,  handle_store ); })* }),* } b }}}}
+macro_rules! __ra_macro_fixture114 {($($name :  ident {$(fn $method :  ident ($($arg :  ident : $arg_ty :  ty ),* $(,)?)$(-> $ret_ty :  ty )*;)* }),* $(,)?)=>{$(pub ( super ) enum $name {$($method ),* } rpc_encode_decode ! ( enum $name {$($method ),* }); )*  pub ( super ) enum  Method {$($name ($name )),* } rpc_encode_decode ! ( enum  Method {$($name ( m )),* }); }}
+macro_rules! __ra_macro_fixture115 {($(if # [ cfg ($meta :  meta )]{$($tokens :  tt )* }) else *  else {$($tokens2 :  tt )* })=>{$crate ::  cfg_if ! {@  __items (); $((($meta )($($tokens )*)), )* (()($($tokens2 )*)), }}; ( if # [ cfg ($i_met :  meta )]{$($i_tokens :  tt )* }$(else  if # [ cfg ($e_met :  meta )]{$($e_tokens :  tt )* })* )=>{$crate ::  cfg_if ! {@  __items (); (($i_met )($($i_tokens )*)), $((($e_met )($($e_tokens )*)), )* (()()), }}; (@  __items ($($not :  meta ,)*); )=>{}; (@  __items ($($not :  meta ,)*); (($($m :  meta ),*)($($tokens :  tt )*)), $($rest :  tt )*)=>{# [ cfg ( all ($($m ,)*  not ( any ($($not ),*))))]$crate ::  cfg_if ! {@  __identity $($tokens )* }$crate ::  cfg_if ! {@  __items ($($not ,)* $($m ,)*); $($rest )* }}; (@  __identity $($tokens :  tt )*)=>{$($tokens )* }; }
+macro_rules! __ra_macro_fixture116 {($lhs :  ty , $rhs :  ty )=>{# [ stable ( feature =  "cmp_os_str" ,  since =  "1.8.0" )] impl < 'a , 'b >  PartialEq <$rhs >  for $lhs {# [ inline ] fn  eq (&  self ,  other : &$rhs )->  bool {<  OsStr  as  PartialEq >::  eq ( self ,  other )}}# [ stable ( feature =  "cmp_os_str" ,  since =  "1.8.0" )] impl < 'a , 'b >  PartialEq <$lhs >  for $rhs {# [ inline ] fn  eq (&  self ,  other : &$lhs )->  bool {<  OsStr  as  PartialEq >::  eq ( self ,  other )}}# [ stable ( feature =  "cmp_os_str" ,  since =  "1.8.0" )] impl < 'a , 'b >  PartialOrd <$rhs >  for $lhs {# [ inline ] fn  partial_cmp (&  self ,  other : &$rhs )->  Option <  cmp ::  Ordering > {<  OsStr  as  PartialOrd >::  partial_cmp ( self ,  other )}}# [ stable ( feature =  "cmp_os_str" ,  since =  "1.8.0" )] impl < 'a , 'b >  PartialOrd <$lhs >  for $rhs {# [ inline ] fn  partial_cmp (&  self ,  other : &$lhs )->  Option <  cmp ::  Ordering > {<  OsStr  as  PartialOrd >::  partial_cmp ( self ,  other )}}}; }
+macro_rules! __ra_macro_fixture117 {()=>{}; ($(# [$attr :  meta ])* $vis :  vis  static $name :  ident : $t :  ty = $init :  expr ; $($rest :  tt )*)=>($crate ::  __thread_local_inner ! ($(# [$attr ])* $vis $name , $t , $init ); $crate ::  thread_local ! ($($rest )*); ); ($(# [$attr :  meta ])* $vis :  vis  static $name :  ident : $t :  ty = $init :  expr )=>($crate ::  __thread_local_inner ! ($(# [$attr ])* $vis $name , $t , $init ); ); }
+macro_rules! __ra_macro_fixture118 {($($t :  ty )*)=>($(impl  ReadNumberHelper  for $t { const  ZERO :  Self =  0 ; # [ inline ] fn  checked_mul (&  self ,  other :  u32 )->  Option <  Self > { Self ::  checked_mul (*  self ,  other .  try_into ().  ok ()?)}# [ inline ] fn  checked_add (&  self ,  other :  u32 )->  Option <  Self > { Self ::  checked_add (*  self ,  other .  try_into ().  ok ()?)}})*)}
+macro_rules! __ra_macro_fixture119 {($lhs :  ty , $rhs :  ty )=>{# [ stable ( feature =  "partialeq_path" ,  since =  "1.6.0" )] impl < 'a , 'b >  PartialEq <$rhs >  for $lhs {# [ inline ] fn  eq (&  self ,  other : &$rhs )->  bool {<  Path  as  PartialEq >::  eq ( self ,  other )}}# [ stable ( feature =  "partialeq_path" ,  since =  "1.6.0" )] impl < 'a , 'b >  PartialEq <$lhs >  for $rhs {# [ inline ] fn  eq (&  self ,  other : &$lhs )->  bool {<  Path  as  PartialEq >::  eq ( self ,  other )}}# [ stable ( feature =  "cmp_path" ,  since =  "1.8.0" )] impl < 'a , 'b >  PartialOrd <$rhs >  for $lhs {# [ inline ] fn  partial_cmp (&  self ,  other : &$rhs )->  Option <  cmp ::  Ordering > {<  Path  as  PartialOrd >::  partial_cmp ( self ,  other )}}# [ stable ( feature =  "cmp_path" ,  since =  "1.8.0" )] impl < 'a , 'b >  PartialOrd <$lhs >  for $rhs {# [ inline ] fn  partial_cmp (&  self ,  other : &$lhs )->  Option <  cmp ::  Ordering > {<  Path  as  PartialOrd >::  partial_cmp ( self ,  other )}}}; }
+macro_rules! __ra_macro_fixture120 {($lhs :  ty , $rhs :  ty )=>{# [ stable ( feature =  "cmp_path" ,  since =  "1.8.0" )] impl < 'a , 'b >  PartialEq <$rhs >  for $lhs {# [ inline ] fn  eq (&  self ,  other : &$rhs )->  bool {<  Path  as  PartialEq >::  eq ( self ,  other .  as_ref ())}}# [ stable ( feature =  "cmp_path" ,  since =  "1.8.0" )] impl < 'a , 'b >  PartialEq <$lhs >  for $rhs {# [ inline ] fn  eq (&  self ,  other : &$lhs )->  bool {<  Path  as  PartialEq >::  eq ( self .  as_ref (),  other )}}# [ stable ( feature =  "cmp_path" ,  since =  "1.8.0" )] impl < 'a , 'b >  PartialOrd <$rhs >  for $lhs {# [ inline ] fn  partial_cmp (&  self ,  other : &$rhs )->  Option <  cmp ::  Ordering > {<  Path  as  PartialOrd >::  partial_cmp ( self ,  other .  as_ref ())}}# [ stable ( feature =  "cmp_path" ,  since =  "1.8.0" )] impl < 'a , 'b >  PartialOrd <$lhs >  for $rhs {# [ inline ] fn  partial_cmp (&  self ,  other : &$lhs )->  Option <  cmp ::  Ordering > {<  Path  as  PartialOrd >::  partial_cmp ( self .  as_ref (),  other )}}}; }
+macro_rules! __ra_macro_fixture121 {(@  key $t :  ty , $init :  expr )=>{{# [ inline ] fn  __init ()-> $t {$init } unsafe  fn  __getit ()-> $crate ::  option ::  Option <& 'static $t > {# [ cfg ( all ( target_arch =  "wasm32" ,  not ( target_feature =  "atomics" )))] static  __KEY : $crate ::  thread ::  __StaticLocalKeyInner <$t > = $crate ::  thread ::  __StaticLocalKeyInner ::  new (); # [ thread_local ]# [ cfg ( all ( target_thread_local ,  not ( all ( target_arch =  "wasm32" ,  not ( target_feature =  "atomics" ))), ))] static  __KEY : $crate ::  thread ::  __FastLocalKeyInner <$t > = $crate ::  thread ::  __FastLocalKeyInner ::  new (); # [ cfg ( all ( not ( target_thread_local ),  not ( all ( target_arch =  "wasm32" ,  not ( target_feature =  "atomics" ))), ))] static  __KEY : $crate ::  thread ::  __OsLocalKeyInner <$t > = $crate ::  thread ::  __OsLocalKeyInner ::  new (); # [ allow ( unused_unsafe )] unsafe { __KEY .  get ( __init )}} unsafe {$crate ::  thread ::  LocalKey ::  new ( __getit )}}}; ($(# [$attr :  meta ])* $vis :  vis $name :  ident , $t :  ty , $init :  expr )=>{$(# [$attr ])* $vis  const $name : $crate ::  thread ::  LocalKey <$t > = $crate ::  __thread_local_inner ! (@  key $t , $init ); }}
+macro_rules! __ra_macro_fixture122 {({$($then_tt :  tt )* } else {$($else_tt :  tt )* })=>{ cfg_if ::  cfg_if ! { if # [ cfg ( all ( target_os =  "linux" ,  target_env =  "gnu" ))]{$($then_tt )* } else {$($else_tt )* }}}; ($($block_inner :  tt )*)=>{# [ cfg ( all ( target_os =  "linux" ,  target_env =  "gnu" ))]{$($block_inner )* }}; }
+macro_rules! __ra_macro_fixture123 {($($t :  ident )*)=>($(impl  IsMinusOne  for $t { fn  is_minus_one (&  self )->  bool {*  self == -  1 }})*)}
+macro_rules! __ra_macro_fixture124 {($(if # [ cfg ($($meta :  meta ),*)]{$($it :  item )* }) else *  else {$($it2 :  item )* })=>{ cfg_if ! {@  __items (); $((($($meta ),*)($($it )*)), )* (()($($it2 )*)), }}; ( if # [ cfg ($($i_met :  meta ),*)]{$($i_it :  item )* }$(else  if # [ cfg ($($e_met :  meta ),*)]{$($e_it :  item )* })* )=>{ cfg_if ! {@  __items (); (($($i_met ),*)($($i_it )*)), $((($($e_met ),*)($($e_it )*)), )* (()()), }}; (@  __items ($($not :  meta ,)*); )=>{}; (@  __items ($($not :  meta ,)*); (($($m :  meta ),*)($($it :  item )*)), $($rest :  tt )*)=>{ cfg_if ! {@  __apply  cfg ( all ($($m ,)*  not ( any ($($not ),*)))), $($it )* } cfg_if ! {@  __items ($($not ,)* $($m ,)*); $($rest )* }}; (@  __apply $m :  meta , $($it :  item )*)=>{$(# [$m ]$it )* }; }
+macro_rules! __ra_macro_fixture125 {($bench_macro :  ident , $bench_ahash_serial :  ident , $bench_std_serial :  ident , $bench_ahash_highbits :  ident , $bench_std_highbits :  ident , $bench_ahash_random :  ident , $bench_std_random :  ident )=>{$bench_macro ! ($bench_ahash_serial ,  AHashMap ,  0 ..); $bench_macro ! ($bench_std_serial ,  StdHashMap ,  0 ..); $bench_macro ! ($bench_ahash_highbits ,  AHashMap , ( 0 ..).  map ( usize ::  swap_bytes )); $bench_macro ! ($bench_std_highbits ,  StdHashMap , ( 0 ..).  map ( usize ::  swap_bytes )); $bench_macro ! ($bench_ahash_random ,  AHashMap ,  RandomKeys ::  new ()); $bench_macro ! ($bench_std_random ,  StdHashMap ,  RandomKeys ::  new ()); }; }
+macro_rules! __ra_macro_fixture126 {($name :  ident , $maptype :  ident , $keydist :  expr )=>{# [ bench ] fn $name ( b : &  mut  Bencher ){ let  mut  m = $maptype ::  with_capacity_and_hasher ( SIZE ,  Default ::  default ());  b .  iter (|| { m .  clear ();  for  i  in ($keydist ).  take ( SIZE ){ m .  insert ( i ,  i ); } black_box (&  mut  m ); })}}; }
+macro_rules! __ra_macro_fixture127 {($name :  ident , $maptype :  ident , $keydist :  expr )=>{# [ bench ] fn $name ( b : &  mut  Bencher ){ let  mut  base = $maptype ::  default ();  for  i  in ($keydist ).  take ( SIZE ){ base .  insert ( i ,  i ); } let  skip = $keydist .  skip ( SIZE );  b .  iter (|| { let  mut  m =  base .  clone ();  let  mut  add_iter =  skip .  clone ();  let  mut  remove_iter = $keydist ;  for ( add ,  remove ) in (&  mut  add_iter ).  zip (&  mut  remove_iter ).  take ( SIZE ){ m .  insert ( add ,  add );  black_box ( m .  remove (&  remove )); } black_box ( m ); })}}; }
+macro_rules! __ra_macro_fixture128 {($name :  ident , $maptype :  ident , $keydist :  expr )=>{# [ bench ] fn $name ( b : &  mut  Bencher ){ let  mut  m = $maptype ::  default ();  for  i  in $keydist .  take ( SIZE ){ m .  insert ( i ,  i ); } b .  iter (|| { for  i  in $keydist .  take ( SIZE ){ black_box ( m .  get (&  i )); }})}}; }
+macro_rules! __ra_macro_fixture129 {($name :  ident , $maptype :  ident , $keydist :  expr )=>{# [ bench ] fn $name ( b : &  mut  Bencher ){ let  mut  m = $maptype ::  default ();  let  mut  iter = $keydist ;  for  i  in (&  mut  iter ).  take ( SIZE ){ m .  insert ( i ,  i ); } b .  iter (|| { for  i  in (&  mut  iter ).  take ( SIZE ){ black_box ( m .  get (&  i )); }})}}; }
+macro_rules! __ra_macro_fixture130 {($name :  ident , $maptype :  ident , $keydist :  expr )=>{# [ bench ] fn $name ( b : &  mut  Bencher ){ let  mut  m = $maptype ::  default ();  for  i  in ($keydist ).  take ( SIZE ){ m .  insert ( i ,  i ); } b .  iter (|| { for  i  in &  m { black_box ( i ); }})}}; }
+macro_rules! __ra_macro_fixture131 {($(if # [ cfg ($($meta :  meta ),*)]{$($it :  item )* }) else *  else {$($it2 :  item )* })=>{ cfg_if ! {@  __items (); $((($($meta ),*)($($it )*)), )* (()($($it2 )*)), }}; ( if # [ cfg ($($i_met :  meta ),*)]{$($i_it :  item )* }$(else  if # [ cfg ($($e_met :  meta ),*)]{$($e_it :  item )* })* )=>{ cfg_if ! {@  __items (); (($($i_met ),*)($($i_it )*)), $((($($e_met ),*)($($e_it )*)), )* (()()), }}; (@  __items ($($not :  meta ,)*); )=>{}; (@  __items ($($not :  meta ,)*); (($($m :  meta ),*)($($it :  item )*)), $($rest :  tt )*)=>{ cfg_if ! {@  __apply  cfg ( all ($($m ,)*  not ( any ($($not ),*)))), $($it )* } cfg_if ! {@  __items ($($not ,)* $($m ,)*); $($rest )* }}; (@  __apply $m :  meta , $($it :  item )*)=>{$(# [$m ]$it )* }; }
+macro_rules! __ra_macro_fixture132 {($($(# [$attr :  meta ])*  pub $t :  ident $i :  ident {$($field :  tt )* })*)=>($(s ! ( it : $(# [$attr ])*  pub $t $i {$($field )* }); )*); ( it : $(# [$attr :  meta ])*  pub  union $i :  ident {$($field :  tt )* })=>( compile_error ! ( "unions cannot derive extra traits, use s_no_extra_traits instead" ); ); ( it : $(# [$attr :  meta ])*  pub  struct $i :  ident {$($field :  tt )* })=>( __item ! {# [ repr ( C )]# [ cfg_attr ( feature =  "extra_traits" ,  derive ( Debug ,  Eq ,  Hash ,  PartialEq ))]# [ allow ( deprecated )]$(# [$attr ])*  pub  struct $i {$($field )* }}# [ allow ( deprecated )] impl ::  Copy  for $i {}# [ allow ( deprecated )] impl ::  Clone  for $i { fn  clone (&  self )-> $i {*  self }}); }
+macro_rules! __ra_macro_fixture133 {($i :  item )=>{$i }; }
+macro_rules! __ra_macro_fixture134 {($($(# [$attr :  meta ])*  pub $t :  ident $i :  ident {$($field :  tt )* })*)=>($(s_no_extra_traits ! ( it : $(# [$attr ])*  pub $t $i {$($field )* }); )*); ( it : $(# [$attr :  meta ])*  pub  union $i :  ident {$($field :  tt )* })=>( cfg_if ! { if # [ cfg ( libc_union )]{ __item ! {# [ repr ( C )]$(# [$attr ])*  pub  union $i {$($field )* }} impl ::  Copy  for $i {} impl ::  Clone  for $i { fn  clone (&  self )-> $i {*  self }}}}); ( it : $(# [$attr :  meta ])*  pub  struct $i :  ident {$($field :  tt )* })=>( __item ! {# [ repr ( C )]$(# [$attr ])*  pub  struct $i {$($field )* }}# [ allow ( deprecated )] impl ::  Copy  for $i {}# [ allow ( deprecated )] impl ::  Clone  for $i { fn  clone (&  self )-> $i {*  self }}); }
+macro_rules! __ra_macro_fixture135 {($($(# [$attr :  meta ])*  pub  const $name :  ident : $t1 :  ty = $t2 :  ident {$($field :  tt )* };)*)=>($(# [ cfg ( libc_align )]$(# [$attr ])*  pub  const $name : $t1 = $t2 {$($field )* }; # [ cfg ( not ( libc_align ))]$(# [$attr ])*  pub  const $name : $t1 = $t2 {$($field )*  __align : [], }; )*)}
+macro_rules! __ra_macro_fixture136 {($($args :  tt )* )=>{$(define_ioctl ! ($args ); )* }}
+macro_rules! __ra_macro_fixture137 {({$name :  ident , $ioctl :  ident , $arg_type :  ty })=>{ pub  unsafe  fn $name ( fd :  c_int ,  arg : $arg_type )->  c_int { untyped_ioctl ( fd ,  bindings ::$ioctl ,  arg )}}; }
+macro_rules! __ra_macro_fixture138 {($($T :  ty ),*)=>{$(impl  IdentFragment  for $T { fn  fmt (&  self ,  f : &  mut  fmt ::  Formatter )->  fmt ::  Result { fmt ::  Display ::  fmt ( self ,  f )}})* }}
+macro_rules! __ra_macro_fixture139 {($($t :  ident =>$name :  ident )*)=>($(impl  ToTokens  for $t { fn  to_tokens (&  self ,  tokens : &  mut  TokenStream ){ tokens .  append ( Literal ::$name (*  self )); }})*)}
+macro_rules! __ra_macro_fixture140 {($($l :  tt )*)=>{$(impl < 'q ,  T : 'q >  RepAsIteratorExt < 'q >  for [ T ; $l ]{ type  Iter =  slice ::  Iter < 'q ,  T >;  fn  quote_into_iter (& 'q  self )-> ( Self ::  Iter ,  HasIter ){( self .  iter (),  HasIter )}})* }}
+macro_rules! __ra_macro_fixture141 {($name :  ident $spanned :  ident $char1 :  tt )=>{ pub  fn $name ( tokens : &  mut  TokenStream ){ tokens .  append ( Punct ::  new ($char1 ,  Spacing ::  Alone )); } pub  fn $spanned ( tokens : &  mut  TokenStream ,  span :  Span ){ let  mut  punct =  Punct ::  new ($char1 ,  Spacing ::  Alone );  punct .  set_span ( span );  tokens .  append ( punct ); }}; ($name :  ident $spanned :  ident $char1 :  tt $char2 :  tt )=>{ pub  fn $name ( tokens : &  mut  TokenStream ){ tokens .  append ( Punct ::  new ($char1 ,  Spacing ::  Joint ));  tokens .  append ( Punct ::  new ($char2 ,  Spacing ::  Alone )); } pub  fn $spanned ( tokens : &  mut  TokenStream ,  span :  Span ){ let  mut  punct =  Punct ::  new ($char1 ,  Spacing ::  Joint );  punct .  set_span ( span );  tokens .  append ( punct );  let  mut  punct =  Punct ::  new ($char2 ,  Spacing ::  Alone );  punct .  set_span ( span );  tokens .  append ( punct ); }}; ($name :  ident $spanned :  ident $char1 :  tt $char2 :  tt $char3 :  tt )=>{ pub  fn $name ( tokens : &  mut  TokenStream ){ tokens .  append ( Punct ::  new ($char1 ,  Spacing ::  Joint ));  tokens .  append ( Punct ::  new ($char2 ,  Spacing ::  Joint ));  tokens .  append ( Punct ::  new ($char3 ,  Spacing ::  Alone )); } pub  fn $spanned ( tokens : &  mut  TokenStream ,  span :  Span ){ let  mut  punct =  Punct ::  new ($char1 ,  Spacing ::  Joint );  punct .  set_span ( span );  tokens .  append ( punct );  let  mut  punct =  Punct ::  new ($char2 ,  Spacing ::  Joint );  punct .  set_span ( span );  tokens .  append ( punct );  let  mut  punct =  Punct ::  new ($char3 ,  Spacing ::  Alone );  punct .  set_span ( span );  tokens .  append ( punct ); }}; }
+macro_rules! __ra_macro_fixture142 {($display :  tt $name :  ty )=>{# [ cfg ( feature =  "parsing" )] impl  Token  for $name { fn  peek ( cursor :  Cursor )->  bool { fn  peek ( input :  ParseStream )->  bool {<$name  as  Parse >::  parse ( input ).  is_ok ()} peek_impl ( cursor ,  peek )} fn  display ()-> & 'static  str {$display }}# [ cfg ( feature =  "parsing" )] impl  private ::  Sealed  for $name {}}; }
+macro_rules! __ra_macro_fixture143 {($display :  tt $ty :  ident $get :  ident )=>{# [ cfg ( feature =  "parsing" )] impl  Token  for $ty { fn  peek ( cursor :  Cursor )->  bool { cursor .$get ().  is_some ()} fn  display ()-> & 'static  str {$display }}# [ cfg ( feature =  "parsing" )] impl  private ::  Sealed  for $ty {}}; }
+macro_rules! __ra_macro_fixture144 {($($token :  tt  pub  struct $name :  ident /$len :  tt # [$doc :  meta ])*)=>{$(# [ repr ( C )]# [$doc ]# [ doc =  "" ]# [ doc =  " Don\\\'t try to remember the name of this type &mdash; use the" ]# [ doc =  " [`Token!`] macro instead." ]# [ doc =  "" ]# [ doc =  " [`Token!`]: crate::token" ] pub  struct $name { pub  spans : [ Span ; $len ], }# [ doc ( hidden )]# [ allow ( non_snake_case )] pub  fn $name <  S :  IntoSpans < [ Span ; $len ]>> ( spans :  S )-> $name {$name { spans :  spans .  into_spans (), }} impl  std ::  default ::  Default  for $name { fn  default ()->  Self {$name { spans : [ Span ::  call_site (); $len ], }}}# [ cfg ( feature =  "clone-impls" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "clone-impls" )))] impl  Copy  for $name {}# [ cfg ( feature =  "clone-impls" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "clone-impls" )))] impl  Clone  for $name { fn  clone (&  self )->  Self {*  self }}# [ cfg ( feature =  "extra-traits" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "extra-traits" )))] impl  Debug  for $name { fn  fmt (&  self ,  f : &  mut  fmt ::  Formatter )->  fmt ::  Result { f .  write_str ( stringify ! ($name ))}}# [ cfg ( feature =  "extra-traits" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "extra-traits" )))] impl  cmp ::  Eq  for $name {}# [ cfg ( feature =  "extra-traits" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "extra-traits" )))] impl  PartialEq  for $name { fn  eq (&  self ,  _other : &$name )->  bool { true }}# [ cfg ( feature =  "extra-traits" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "extra-traits" )))] impl  Hash  for $name { fn  hash <  H :  Hasher > (&  self ,  _state : &  mut  H ){}} impl_deref_if_len_is_1 ! ($name /$len ); )* }; }
+macro_rules! __ra_macro_fixture145 {($($token :  tt  pub  struct $name :  ident # [$doc :  meta ])*)=>{$(# [$doc ]# [ doc =  "" ]# [ doc =  " Don\\\'t try to remember the name of this type &mdash; use the" ]# [ doc =  " [`Token!`] macro instead." ]# [ doc =  "" ]# [ doc =  " [`Token!`]: crate::token" ] pub  struct $name { pub  span :  Span , }# [ doc ( hidden )]# [ allow ( non_snake_case )] pub  fn $name <  S :  IntoSpans < [ Span ;  1 ]>> ( span :  S )-> $name {$name { span :  span .  into_spans ()[ 0 ], }} impl  std ::  default ::  Default  for $name { fn  default ()->  Self {$name { span :  Span ::  call_site (), }}}# [ cfg ( feature =  "clone-impls" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "clone-impls" )))] impl  Copy  for $name {}# [ cfg ( feature =  "clone-impls" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "clone-impls" )))] impl  Clone  for $name { fn  clone (&  self )->  Self {*  self }}# [ cfg ( feature =  "extra-traits" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "extra-traits" )))] impl  Debug  for $name { fn  fmt (&  self ,  f : &  mut  fmt ::  Formatter )->  fmt ::  Result { f .  write_str ( stringify ! ($name ))}}# [ cfg ( feature =  "extra-traits" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "extra-traits" )))] impl  cmp ::  Eq  for $name {}# [ cfg ( feature =  "extra-traits" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "extra-traits" )))] impl  PartialEq  for $name { fn  eq (&  self ,  _other : &$name )->  bool { true }}# [ cfg ( feature =  "extra-traits" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "extra-traits" )))] impl  Hash  for $name { fn  hash <  H :  Hasher > (&  self ,  _state : &  mut  H ){}}# [ cfg ( feature =  "printing" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "printing" )))] impl  ToTokens  for $name { fn  to_tokens (&  self ,  tokens : &  mut  TokenStream ){ printing ::  keyword ($token ,  self .  span ,  tokens ); }}# [ cfg ( feature =  "parsing" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "parsing" )))] impl  Parse  for $name { fn  parse ( input :  ParseStream )->  Result <  Self > { Ok ($name { span :  parsing ::  keyword ( input , $token )?, })}}# [ cfg ( feature =  "parsing" )] impl  Token  for $name { fn  peek ( cursor :  Cursor )->  bool { parsing ::  peek_keyword ( cursor , $token )} fn  display ()-> & 'static  str { concat ! ( "`" , $token ,  "`" )}}# [ cfg ( feature =  "parsing" )] impl  private ::  Sealed  for $name {})* }; }
+macro_rules! __ra_macro_fixture146 {($($token :  tt  pub  struct $name :  ident /$len :  tt # [$doc :  meta ])*)=>{$(define_punctuation_structs ! {$token  pub  struct $name /$len # [$doc ]}# [ cfg ( feature =  "printing" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "printing" )))] impl  ToTokens  for $name { fn  to_tokens (&  self ,  tokens : &  mut  TokenStream ){ printing ::  punct ($token , &  self .  spans ,  tokens ); }}# [ cfg ( feature =  "parsing" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "parsing" )))] impl  Parse  for $name { fn  parse ( input :  ParseStream )->  Result <  Self > { Ok ($name { spans :  parsing ::  punct ( input , $token )?, })}}# [ cfg ( feature =  "parsing" )] impl  Token  for $name { fn  peek ( cursor :  Cursor )->  bool { parsing ::  peek_punct ( cursor , $token )} fn  display ()-> & 'static  str { concat ! ( "`" , $token ,  "`" )}}# [ cfg ( feature =  "parsing" )] impl  private ::  Sealed  for $name {})* }; }
+macro_rules! __ra_macro_fixture147 {($($token :  tt  pub  struct $name :  ident # [$doc :  meta ])*)=>{$(# [$doc ] pub  struct $name { pub  span :  Span , }# [ doc ( hidden )]# [ allow ( non_snake_case )] pub  fn $name <  S :  IntoSpans < [ Span ;  1 ]>> ( span :  S )-> $name {$name { span :  span .  into_spans ()[ 0 ], }} impl  std ::  default ::  Default  for $name { fn  default ()->  Self {$name { span :  Span ::  call_site (), }}}# [ cfg ( feature =  "clone-impls" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "clone-impls" )))] impl  Copy  for $name {}# [ cfg ( feature =  "clone-impls" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "clone-impls" )))] impl  Clone  for $name { fn  clone (&  self )->  Self {*  self }}# [ cfg ( feature =  "extra-traits" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "extra-traits" )))] impl  Debug  for $name { fn  fmt (&  self ,  f : &  mut  fmt ::  Formatter )->  fmt ::  Result { f .  write_str ( stringify ! ($name ))}}# [ cfg ( feature =  "extra-traits" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "extra-traits" )))] impl  cmp ::  Eq  for $name {}# [ cfg ( feature =  "extra-traits" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "extra-traits" )))] impl  PartialEq  for $name { fn  eq (&  self ,  _other : &$name )->  bool { true }}# [ cfg ( feature =  "extra-traits" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "extra-traits" )))] impl  Hash  for $name { fn  hash <  H :  Hasher > (&  self ,  _state : &  mut  H ){}} impl $name {# [ cfg ( feature =  "printing" )] pub  fn  surround <  F > (&  self ,  tokens : &  mut  TokenStream ,  f :  F ) where  F :  FnOnce (&  mut  TokenStream ), { printing ::  delim ($token ,  self .  span ,  tokens ,  f ); }}# [ cfg ( feature =  "parsing" )] impl  private ::  Sealed  for $name {})* }; }
+macro_rules! __ra_macro_fixture148 {($token :  ident )=>{ impl  From <  Token ! [$token ]>  for  Ident { fn  from ( token :  Token ! [$token ])->  Ident { Ident ::  new ( stringify ! ($token ),  token .  span )}}}; }
+macro_rules! __ra_macro_fixture149 {([$($attrs_pub :  tt )*] struct $name :  ident #  full $($rest :  tt )* )=>{# [ cfg ( feature =  "full" )]$($attrs_pub )*  struct $name $($rest )* # [ cfg ( not ( feature =  "full" ))]$($attrs_pub )*  struct $name { _noconstruct : ::  std ::  marker ::  PhantomData <::  proc_macro2 ::  Span >, }# [ cfg ( all ( not ( feature =  "full" ),  feature =  "printing" ))] impl ::  quote ::  ToTokens  for $name { fn  to_tokens (&  self , _: &  mut ::  proc_macro2 ::  TokenStream ){ unreachable ! ()}}}; ([$($attrs_pub :  tt )*] struct $name :  ident $($rest :  tt )* )=>{$($attrs_pub )*  struct $name $($rest )* }; ($($t :  tt )*)=>{ strip_attrs_pub ! ( ast_struct ! ($($t )*)); }; }
+macro_rules! __ra_macro_fixture150 {([$($attrs_pub :  tt )*] enum $name :  ident #  no_visit $($rest :  tt )* )=>( ast_enum ! ([$($attrs_pub )*] enum $name $($rest )*); ); ([$($attrs_pub :  tt )*] enum $name :  ident $($rest :  tt )* )=>($($attrs_pub )*  enum $name $($rest )* ); ($($t :  tt )*)=>{ strip_attrs_pub ! ( ast_enum ! ($($t )*)); }; }
+macro_rules! __ra_macro_fixture151 {($(# [$enum_attr :  meta ])* $pub :  ident $enum :  ident $name :  ident #$tag :  ident $body :  tt $($remaining :  tt )* )=>{ ast_enum ! ($(# [$enum_attr ])* $pub $enum $name #$tag $body );  ast_enum_of_structs_impl ! ($pub $enum $name $body $($remaining )*); }; ($(# [$enum_attr :  meta ])* $pub :  ident $enum :  ident $name :  ident $body :  tt $($remaining :  tt )* )=>{ ast_enum ! ($(# [$enum_attr ])* $pub $enum $name $body );  ast_enum_of_structs_impl ! ($pub $enum $name $body $($remaining )*); }; }
+macro_rules! __ra_macro_fixture152 {($ident :  ident )=>{# [ allow ( non_camel_case_types )] pub  struct $ident { pub  span : $crate ::  __private ::  Span , }# [ doc ( hidden )]# [ allow ( dead_code ,  non_snake_case )] pub  fn $ident <  __S : $crate ::  __private ::  IntoSpans < [$crate ::  __private ::  Span ;  1 ]>> ( span :  __S , )-> $ident {$ident { span : $crate ::  __private ::  IntoSpans ::  into_spans ( span )[ 0 ], }} impl $crate ::  __private ::  Default  for $ident { fn  default ()->  Self {$ident { span : $crate ::  __private ::  Span ::  call_site (), }}}$crate ::  impl_parse_for_custom_keyword ! ($ident ); $crate ::  impl_to_tokens_for_custom_keyword ! ($ident ); $crate ::  impl_clone_for_custom_keyword ! ($ident ); $crate ::  impl_extra_traits_for_custom_keyword ! ($ident ); }; }
+macro_rules! __ra_macro_fixture153 {($($expr_type :  ty , $variant :  ident , $msg :  expr , )* )=>{$(# [ cfg ( all ( feature =  "full" ,  feature =  "printing" ))]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "parsing" )))] impl  Parse  for $expr_type { fn  parse ( input :  ParseStream )->  Result <  Self > { let  mut  expr :  Expr =  input .  parse ()?;  loop { match  expr { Expr ::$variant ( inner )=> return  Ok ( inner ),  Expr ::  Group ( next )=> expr = *  next .  expr , _ => return  Err ( Error ::  new_spanned ( expr , $msg )), }}}})* }; }
+macro_rules! __ra_macro_fixture154 {($ty :  ident )=>{# [ cfg ( feature =  "clone-impls" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "clone-impls" )))] impl < 'a >  Clone  for $ty < 'a > { fn  clone (&  self )->  Self {$ty ( self .  0 )}}# [ cfg ( feature =  "extra-traits" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "extra-traits" )))] impl < 'a >  Debug  for $ty < 'a > { fn  fmt (&  self ,  formatter : &  mut  fmt ::  Formatter )->  fmt ::  Result { formatter .  debug_tuple ( stringify ! ($ty )).  field ( self .  0 ).  finish ()}}# [ cfg ( feature =  "extra-traits" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "extra-traits" )))] impl < 'a >  Eq  for $ty < 'a > {}# [ cfg ( feature =  "extra-traits" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "extra-traits" )))] impl < 'a >  PartialEq  for $ty < 'a > { fn  eq (&  self ,  other : &  Self )->  bool { self .  0 ==  other .  0 }}# [ cfg ( feature =  "extra-traits" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "extra-traits" )))] impl < 'a >  Hash  for $ty < 'a > { fn  hash <  H :  Hasher > (&  self ,  state : &  mut  H ){ self .  0 .  hash ( state ); }}}; }
+macro_rules! __ra_macro_fixture155 {($ty :  ident )=>{# [ cfg ( feature =  "clone-impls" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "clone-impls" )))] impl  Clone  for $ty { fn  clone (&  self )->  Self {$ty { repr :  self .  repr .  clone (), }}}# [ cfg ( feature =  "extra-traits" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "extra-traits" )))] impl  PartialEq  for $ty { fn  eq (&  self ,  other : &  Self )->  bool { self .  repr .  token .  to_string ()==  other .  repr .  token .  to_string ()}}# [ cfg ( feature =  "extra-traits" )]# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "extra-traits" )))] impl  Hash  for $ty { fn  hash <  H > (&  self ,  state : &  mut  H ) where  H :  Hasher , { self .  repr .  token .  to_string ().  hash ( state ); }}# [ cfg ( feature =  "parsing" )]# [ doc ( hidden )]# [ allow ( non_snake_case )] pub  fn $ty ( marker :  lookahead ::  TokenMarker )-> $ty { match  marker {}}}; }
+macro_rules! __ra_macro_fixture156 {($name :  ident /  1 )=>{ impl  Deref  for $name { type  Target =  WithSpan ;  fn  deref (&  self )-> &  Self ::  Target { unsafe {&* ( self  as *  const  Self  as *  const  WithSpan )}}} impl  DerefMut  for $name { fn  deref_mut (&  mut  self )-> &  mut  Self ::  Target { unsafe {&  mut * ( self  as *  mut  Self  as *  mut  WithSpan )}}}}; ($name :  ident /$len :  tt )=>{}; }
+macro_rules! __ra_macro_fixture157 {($($await_rule :  tt )*)=>{# [ doc =  " A type-macro that expands to the name of the Rust type representation of a" ]# [ doc =  " given token." ]# [ doc =  "" ]# [ doc =  " See the [token module] documentation for details and examples." ]# [ doc =  "" ]# [ doc =  " [token module]: crate::token" ]# [ macro_export ] macro_rules !  Token {[ abstract ]=>{$crate ::  token ::  Abstract }; [ as ]=>{$crate ::  token ::  As }; [ async ]=>{$crate ::  token ::  Async }; [ auto ]=>{$crate ::  token ::  Auto }; $($await_rule =>{$crate ::  token ::  Await };)* [ become ]=>{$crate ::  token ::  Become }; [ box ]=>{$crate ::  token ::  Box }; [ break ]=>{$crate ::  token ::  Break }; [ const ]=>{$crate ::  token ::  Const }; [ continue ]=>{$crate ::  token ::  Continue }; [ crate ]=>{$crate ::  token ::  Crate }; [ default ]=>{$crate ::  token ::  Default }; [ do ]=>{$crate ::  token ::  Do }; [ dyn ]=>{$crate ::  token ::  Dyn }; [ else ]=>{$crate ::  token ::  Else }; [ enum ]=>{$crate ::  token ::  Enum }; [ extern ]=>{$crate ::  token ::  Extern }; [ final ]=>{$crate ::  token ::  Final }; [ fn ]=>{$crate ::  token ::  Fn }; [ for ]=>{$crate ::  token ::  For }; [ if ]=>{$crate ::  token ::  If }; [ impl ]=>{$crate ::  token ::  Impl }; [ in ]=>{$crate ::  token ::  In }; [ let ]=>{$crate ::  token ::  Let }; [ loop ]=>{$crate ::  token ::  Loop }; [ macro ]=>{$crate ::  token ::  Macro }; [ match ]=>{$crate ::  token ::  Match }; [ mod ]=>{$crate ::  token ::  Mod }; [ move ]=>{$crate ::  token ::  Move }; [ mut ]=>{$crate ::  token ::  Mut }; [ override ]=>{$crate ::  token ::  Override }; [ priv ]=>{$crate ::  token ::  Priv }; [ pub ]=>{$crate ::  token ::  Pub }; [ ref ]=>{$crate ::  token ::  Ref }; [ return ]=>{$crate ::  token ::  Return }; [ Self ]=>{$crate ::  token ::  SelfType }; [ self ]=>{$crate ::  token ::  SelfValue }; [ static ]=>{$crate ::  token ::  Static }; [ struct ]=>{$crate ::  token ::  Struct }; [ super ]=>{$crate ::  token ::  Super }; [ trait ]=>{$crate ::  token ::  Trait }; [ try ]=>{$crate ::  token ::  Try }; [ type ]=>{$crate ::  token ::  Type }; [ typeof ]=>{$crate ::  token ::  Typeof }; [ union ]=>{$crate ::  token ::  Union }; [ unsafe ]=>{$crate ::  token ::  Unsafe }; [ unsized ]=>{$crate ::  token ::  Unsized }; [ use ]=>{$crate ::  token ::  Use }; [ virtual ]=>{$crate ::  token ::  Virtual }; [ where ]=>{$crate ::  token ::  Where }; [ while ]=>{$crate ::  token ::  While }; [ yield ]=>{$crate ::  token ::  Yield }; [+]=>{$crate ::  token ::  Add }; [+=]=>{$crate ::  token ::  AddEq }; [&]=>{$crate ::  token ::  And }; [&&]=>{$crate ::  token ::  AndAnd }; [&=]=>{$crate ::  token ::  AndEq }; [@]=>{$crate ::  token ::  At }; [!]=>{$crate ::  token ::  Bang }; [^]=>{$crate ::  token ::  Caret }; [^=]=>{$crate ::  token ::  CaretEq }; [:]=>{$crate ::  token ::  Colon }; [::]=>{$crate ::  token ::  Colon2 }; [,]=>{$crate ::  token ::  Comma }; [/]=>{$crate ::  token ::  Div }; [/=]=>{$crate ::  token ::  DivEq }; [$]=>{$crate ::  token ::  Dollar }; [.]=>{$crate ::  token ::  Dot }; [..]=>{$crate ::  token ::  Dot2 }; [...]=>{$crate ::  token ::  Dot3 }; [..=]=>{$crate ::  token ::  DotDotEq }; [=]=>{$crate ::  token ::  Eq }; [==]=>{$crate ::  token ::  EqEq }; [>=]=>{$crate ::  token ::  Ge }; [>]=>{$crate ::  token ::  Gt }; [<=]=>{$crate ::  token ::  Le }; [<]=>{$crate ::  token ::  Lt }; [*=]=>{$crate ::  token ::  MulEq }; [!=]=>{$crate ::  token ::  Ne }; [|]=>{$crate ::  token ::  Or }; [|=]=>{$crate ::  token ::  OrEq }; [||]=>{$crate ::  token ::  OrOr }; [#]=>{$crate ::  token ::  Pound }; [?]=>{$crate ::  token ::  Question }; [->]=>{$crate ::  token ::  RArrow }; [<-]=>{$crate ::  token ::  LArrow }; [%]=>{$crate ::  token ::  Rem }; [%=]=>{$crate ::  token ::  RemEq }; [=>]=>{$crate ::  token ::  FatArrow }; [;]=>{$crate ::  token ::  Semi }; [<<]=>{$crate ::  token ::  Shl }; [<<=]=>{$crate ::  token ::  ShlEq }; [>>]=>{$crate ::  token ::  Shr }; [>>=]=>{$crate ::  token ::  ShrEq }; [*]=>{$crate ::  token ::  Star }; [-]=>{$crate ::  token ::  Sub }; [-=]=>{$crate ::  token ::  SubEq }; [~]=>{$crate ::  token ::  Tilde }; [_]=>{$crate ::  token ::  Underscore }; }}; }
+macro_rules! __ra_macro_fixture158 {($mac :  ident ! ($(# [$m :  meta ])* $pub :  ident $($t :  tt )*))=>{ check_keyword_matches ! ( pub $pub ); $mac ! ([$(# [$m ])* $pub ]$($t )*); }; }
+macro_rules! __ra_macro_fixture159 {($pub :  ident $enum :  ident $name :  ident {$($(# [$variant_attr :  meta ])* $variant :  ident $(($($member :  ident )::+))*, )* }$($remaining :  tt )* )=>{ check_keyword_matches ! ( pub $pub );  check_keyword_matches ! ( enum $enum ); $($(ast_enum_from_struct ! ($name ::$variant , $($member )::+); )*)* # [ cfg ( feature =  "printing" )] generate_to_tokens ! {$($remaining )* () tokens $name {$($variant $($($member )::+)*,)* }}}; }
+macro_rules! __ra_macro_fixture160 {($ident :  ident )=>{ impl $crate ::  token ::  CustomToken  for $ident { fn  peek ( cursor : $crate ::  buffer ::  Cursor )-> $crate ::  __private ::  bool { if  let  Some (( ident ,  _rest ))=  cursor .  ident (){ ident ==  stringify ! ($ident )} else { false }} fn  display ()-> & 'static $crate ::  __private ::  str { concat ! ( "`" ,  stringify ! ($ident ),  "`" )}} impl $crate ::  parse ::  Parse  for $ident { fn  parse ( input : $crate ::  parse ::  ParseStream )-> $crate ::  parse ::  Result <$ident > { input .  step (|  cursor | { if  let $crate ::  __private ::  Some (( ident ,  rest ))=  cursor .  ident (){ if  ident ==  stringify ! ($ident ){ return $crate ::  __private ::  Ok (($ident { span :  ident .  span ()},  rest )); }}$crate ::  __private ::  Err ( cursor .  error ( concat ! ( "expected `" ,  stringify ! ($ident ),  "`" )))})}}}; }
+macro_rules! __ra_macro_fixture161 {($ident :  ident )=>{ impl $crate ::  __private ::  ToTokens  for $ident { fn  to_tokens (&  self ,  tokens : &  mut $crate ::  __private ::  TokenStream2 ){ let  ident = $crate ::  Ident ::  new ( stringify ! ($ident ),  self .  span ); $crate ::  __private ::  TokenStreamExt ::  append ( tokens ,  ident ); }}}; }
+macro_rules! __ra_macro_fixture162 {($ident :  ident )=>{ impl $crate ::  __private ::  Copy  for $ident {} impl $crate ::  __private ::  Clone  for $ident { fn  clone (&  self )->  Self {*  self }}}; }
+macro_rules! __ra_macro_fixture163 {($ident :  ident )=>{ impl $crate ::  __private ::  Debug  for $ident { fn  fmt (&  self ,  f : &  mut $crate ::  __private ::  Formatter )-> $crate ::  __private ::  fmt ::  Result {$crate ::  __private ::  Formatter ::  write_str ( f ,  concat ! ( "Keyword [" ,  stringify ! ($ident ),  "]" ), )}} impl $crate ::  __private ::  Eq  for $ident {} impl $crate ::  __private ::  PartialEq  for $ident { fn  eq (&  self ,  _other : &  Self )-> $crate ::  __private ::  bool { true }} impl $crate ::  __private ::  Hash  for $ident { fn  hash <  __H : $crate ::  __private ::  Hasher > (&  self ,  _state : &  mut  __H ){}}}; }
+macro_rules! __ra_macro_fixture164 {( struct  struct )=>{}; ( enum  enum )=>{}; ( pub  pub )=>{}; }
+macro_rules! __ra_macro_fixture165 {($name :  ident ::  Verbatim , $member :  ident )=>{}; ($name :  ident ::$variant :  ident ,  crate ::  private )=>{}; ($name :  ident ::$variant :  ident , $member :  ident )=>{ impl  From <$member >  for $name { fn  from ( e : $member )-> $name {$name ::$variant ( e )}}}; }
+macro_rules! __ra_macro_fixture166 {( do_not_generate_to_tokens $($foo :  tt )*)=>(); (($($arms :  tt )*)$tokens :  ident $name :  ident {$variant :  ident , $($next :  tt )*})=>{ generate_to_tokens ! (($($arms )* $name ::$variant =>{})$tokens $name {$($next )* }); }; (($($arms :  tt )*)$tokens :  ident $name :  ident {$variant :  ident $member :  ident , $($next :  tt )*})=>{ generate_to_tokens ! (($($arms )* $name ::$variant ( _e )=> _e .  to_tokens ($tokens ),)$tokens $name {$($next )* }); }; (($($arms :  tt )*)$tokens :  ident $name :  ident {$variant :  ident  crate ::  private , $($next :  tt )*})=>{ generate_to_tokens ! (($($arms )* $name ::$variant (_)=> unreachable ! (),)$tokens $name {$($next )* }); }; (($($arms :  tt )*)$tokens :  ident $name :  ident {})=>{# [ cfg_attr ( doc_cfg ,  doc ( cfg ( feature =  "printing" )))] impl ::  quote ::  ToTokens  for $name { fn  to_tokens (&  self , $tokens : &  mut ::  proc_macro2 ::  TokenStream ){ match  self {$($arms )* }}}}; }
+macro_rules! __ra_macro_fixture167 {($(# [$attr :  meta ])*  static  ref $N :  ident : $T :  ty = $e :  expr ; $($t :  tt )*)=>{ __lazy_static_internal ! ($(# [$attr ])* () static  ref $N : $T = $e ; $($t )*); }; ($(# [$attr :  meta ])*  pub  static  ref $N :  ident : $T :  ty = $e :  expr ; $($t :  tt )*)=>{ __lazy_static_internal ! ($(# [$attr ])* ( pub ) static  ref $N : $T = $e ; $($t )*); }; ($(# [$attr :  meta ])*  pub ($($vis :  tt )+) static  ref $N :  ident : $T :  ty = $e :  expr ; $($t :  tt )*)=>{ __lazy_static_internal ! ($(# [$attr ])* ( pub ($($vis )+)) static  ref $N : $T = $e ; $($t )*); }; ()=>()}
+macro_rules! __ra_macro_fixture168 {($($record :  ident ($($whatever :  tt )+ )),+ )=>{$(impl_value ! {$record ($($whatever )+ )})+ }}
+macro_rules! __ra_macro_fixture169 {($($len :  tt ),+ )=>{$(impl < 'a >  private ::  ValidLen < 'a >  for [(& 'a  Field ,  Option <& 'a ( dyn  Value + 'a )>); $len ]{})+ }}
+macro_rules! __ra_macro_fixture170 {($(# [$attr :  meta ])* ($($vis :  tt )*) static  ref $N :  ident : $T :  ty = $e :  expr ; $($t :  tt )*)=>{ __lazy_static_internal ! (@  MAKE  TY , $(# [$attr ])*, ($($vis )*), $N );  __lazy_static_internal ! (@  TAIL , $N : $T = $e );  lazy_static ! ($($t )*); }; (@  TAIL , $N :  ident : $T :  ty = $e :  expr )=>{ impl $crate ::  __Deref  for $N { type  Target = $T ;  fn  deref (&  self )-> &$T {# [ inline ( always )] fn  __static_ref_initialize ()-> $T {$e }# [ inline ( always )] fn  __stability ()-> & 'static $T { __lazy_static_create ! ( LAZY , $T );  LAZY .  get ( __static_ref_initialize )} __stability ()}} impl $crate ::  LazyStatic  for $N { fn  initialize ( lazy : &  Self ){ let _ = &**  lazy ; }}}; (@  MAKE  TY , $(# [$attr :  meta ])*, ($($vis :  tt )*), $N :  ident )=>{# [ allow ( missing_copy_implementations )]# [ allow ( non_camel_case_types )]# [ allow ( dead_code )]$(# [$attr ])* $($vis )*  struct $N { __private_field : ()}# [ doc ( hidden )]$($vis )*  static $N : $N = $N { __private_field : ()}; }; ()=>()}
+macro_rules! __ra_macro_fixture171 {($record :  ident ($($value_ty :  tt ),+ ))=>{$(impl_one_value ! ($value_ty , |  this : $value_ty |  this , $record ); )+ }; ($record :  ident ($($value_ty :  tt ),+  as $as_ty :  ty ))=>{$(impl_one_value ! ($value_ty , |  this : $value_ty |  this  as $as_ty , $record ); )+ }; }
+macro_rules! __ra_macro_fixture172 {( bool , $op :  expr , $record :  ident )=>{ impl_one_value ! ( normal ,  bool , $op , $record ); }; ($value_ty :  tt , $op :  expr , $record :  ident )=>{ impl_one_value ! ( normal , $value_ty , $op , $record );  impl_one_value ! ( nonzero , $value_ty , $op , $record ); }; ( normal , $value_ty :  tt , $op :  expr , $record :  ident )=>{ impl $crate ::  sealed ::  Sealed  for $value_ty {} impl $crate ::  field ::  Value  for $value_ty { fn  record (&  self ,  key : &$crate ::  field ::  Field ,  visitor : &  mut  dyn $crate ::  field ::  Visit ){ visitor .$record ( key , $op (*  self ))}}}; ( nonzero , $value_ty :  tt , $op :  expr , $record :  ident )=>{# [ allow ( clippy ::  useless_attribute ,  unused )] use  num ::*;  impl $crate ::  sealed ::  Sealed  for  ty_to_nonzero ! ($value_ty ){} impl $crate ::  field ::  Value  for  ty_to_nonzero ! ($value_ty ){ fn  record (&  self ,  key : &$crate ::  field ::  Field ,  visitor : &  mut  dyn $crate ::  field ::  Visit ){ visitor .$record ( key , $op ( self .  get ()))}}}; }
+macro_rules! __ra_macro_fixture173 {($(# [ doc $($doc :  tt )*])* # [ project = $proj_mut_ident :  ident ]# [ project_ref = $proj_ref_ident :  ident ]# [ project_replace = $proj_replace_ident :  ident ]$($tt :  tt )* )=>{$crate ::  __pin_project_internal ! {[$proj_mut_ident ][$proj_ref_ident ][$proj_replace_ident ]$(# [ doc $($doc )*])* $($tt )* }}; ($(# [ doc $($doc :  tt )*])* # [ project = $proj_mut_ident :  ident ]# [ project_ref = $proj_ref_ident :  ident ]$($tt :  tt )* )=>{$crate ::  __pin_project_internal ! {[$proj_mut_ident ][$proj_ref_ident ][]$(# [ doc $($doc )*])* $($tt )* }}; ($(# [ doc $($doc :  tt )*])* # [ project = $proj_mut_ident :  ident ]# [ project_replace = $proj_replace_ident :  ident ]$($tt :  tt )* )=>{$crate ::  __pin_project_internal ! {[$proj_mut_ident ][][$proj_replace_ident ]$(# [ doc $($doc )*])* $($tt )* }}; ($(# [ doc $($doc :  tt )*])* # [ project_ref = $proj_ref_ident :  ident ]# [ project_replace = $proj_replace_ident :  ident ]$($tt :  tt )* )=>{$crate ::  __pin_project_internal ! {[][$proj_ref_ident ][$proj_replace_ident ]$(# [ doc $($doc )*])* $($tt )* }}; ($(# [ doc $($doc :  tt )*])* # [ project = $proj_mut_ident :  ident ]$($tt :  tt )* )=>{$crate ::  __pin_project_internal ! {[$proj_mut_ident ][][]$(# [ doc $($doc )*])* $($tt )* }}; ($(# [ doc $($doc :  tt )*])* # [ project_ref = $proj_ref_ident :  ident ]$($tt :  tt )* )=>{$crate ::  __pin_project_internal ! {[][$proj_ref_ident ][]$(# [ doc $($doc )*])* $($tt )* }}; ($(# [ doc $($doc :  tt )*])* # [ project_replace = $proj_replace_ident :  ident ]$($tt :  tt )* )=>{$crate ::  __pin_project_internal ! {[][][$proj_replace_ident ]$(# [ doc $($doc )*])* $($tt )* }}; ($($tt :  tt )* )=>{$crate ::  __pin_project_internal ! {[][][]$($tt )* }}; }
+macro_rules! __ra_macro_fixture174 {(@  struct => internal ; [$($proj_mut_ident :  ident )?][$($proj_ref_ident :  ident )?][$($proj_replace_ident :  ident )?][$proj_vis :  vis ][$(# [$attrs :  meta ])* $vis :  vis  struct $ident :  ident ][$($def_generics :  tt )*][$($impl_generics :  tt )*][$($ty_generics :  tt )*][$(where $($where_clause :  tt )*)?]{$($(# [$pin :  ident ])? $field_vis :  vis $field :  ident : $field_ty :  ty ),+ })=>{$(# [$attrs ])* $vis  struct $ident $($def_generics )* $(where $($where_clause )*)? {$($field_vis $field : $field_ty ),+ }$crate ::  __pin_project_internal ! {@  struct => make_proj_ty => named ; [$proj_vis ][$($proj_mut_ident )?][ make_proj_field_mut ][$ident ][$($impl_generics )*][$($ty_generics )*][$(where $($where_clause )*)?]{$($(# [$pin ])? $field_vis $field : $field_ty ),+ }}$crate ::  __pin_project_internal ! {@  struct => make_proj_ty => named ; [$proj_vis ][$($proj_ref_ident )?][ make_proj_field_ref ][$ident ][$($impl_generics )*][$($ty_generics )*][$(where $($where_clause )*)?]{$($(# [$pin ])? $field_vis $field : $field_ty ),+ }}$crate ::  __pin_project_internal ! {@  struct => make_proj_replace_ty => named ; [$proj_vis ][$($proj_replace_ident )?][ make_proj_field_replace ][$ident ][$($impl_generics )*][$($ty_generics )*][$(where $($where_clause )*)?]{$($(# [$pin ])? $field_vis $field : $field_ty ),+ }}# [ allow ( explicit_outlives_requirements )]# [ allow ( single_use_lifetimes )]# [ allow ( clippy ::  unknown_clippy_lints )]# [ allow ( clippy ::  redundant_pub_crate )]# [ allow ( clippy ::  used_underscore_binding )] const _: ()= {$crate ::  __pin_project_internal ! {@  struct => make_proj_ty => unnamed ; [$proj_vis ][$($proj_mut_ident )?][ Projection ][ make_proj_field_mut ][$ident ][$($impl_generics )*][$($ty_generics )*][$(where $($where_clause )*)?]{$($(# [$pin ])? $field_vis $field : $field_ty ),+ }}$crate ::  __pin_project_internal ! {@  struct => make_proj_ty => unnamed ; [$proj_vis ][$($proj_ref_ident )?][ ProjectionRef ][ make_proj_field_ref ][$ident ][$($impl_generics )*][$($ty_generics )*][$(where $($where_clause )*)?]{$($(# [$pin ])? $field_vis $field : $field_ty ),+ }}$crate ::  __pin_project_internal ! {@  struct => make_proj_replace_ty => unnamed ; [$proj_vis ][$($proj_replace_ident )?][ ProjectionReplace ][ make_proj_field_replace ][$ident ][$($impl_generics )*][$($ty_generics )*][$(where $($where_clause )*)?]{$($(# [$pin ])? $field_vis $field : $field_ty ),+ }} impl <$($impl_generics )*> $ident <$($ty_generics )*> $(where $($where_clause )*)? {$crate ::  __pin_project_internal ! {@  struct => make_proj_method ; [$proj_vis ][$($proj_mut_ident )?][ Projection ][ project  get_unchecked_mut  mut ][$($ty_generics )*]{$($(# [$pin ])? $field_vis $field ),+ }}$crate ::  __pin_project_internal ! {@  struct => make_proj_method ; [$proj_vis ][$($proj_ref_ident )?][ ProjectionRef ][ project_ref  get_ref ][$($ty_generics )*]{$($(# [$pin ])? $field_vis $field ),+ }}$crate ::  __pin_project_internal ! {@  struct => make_proj_replace_method ; [$proj_vis ][$($proj_replace_ident )?][ ProjectionReplace ][$($ty_generics )*]{$($(# [$pin ])? $field_vis $field ),+ }}}$crate ::  __pin_project_internal ! {@  make_unpin_impl ; [$vis $ident ][$($impl_generics )*][$($ty_generics )*][$(where $($where_clause )*)?]$($field : $crate ::  __pin_project_internal ! (@  make_unpin_bound ; $(# [$pin ])? $field_ty )),+ }$crate ::  __pin_project_internal ! {@  make_drop_impl ; [$ident ][$($impl_generics )*][$($ty_generics )*][$(where $($where_clause )*)?]}# [ forbid ( safe_packed_borrows )] fn  __assert_not_repr_packed <$($impl_generics )*> ( this : &$ident <$($ty_generics )*>)$(where $($where_clause )*)? {$(let _ = &  this .$field ; )+ }}; }; (@  enum => internal ; [$($proj_mut_ident :  ident )?][$($proj_ref_ident :  ident )?][$($proj_replace_ident :  ident )?][$proj_vis :  vis ][$(# [$attrs :  meta ])* $vis :  vis  enum $ident :  ident ][$($def_generics :  tt )*][$($impl_generics :  tt )*][$($ty_generics :  tt )*][$(where $($where_clause :  tt )*)?]{$($(# [$variant_attrs :  meta ])* $variant :  ident $({$($(# [$pin :  ident ])? $field :  ident : $field_ty :  ty ),+ })? ),+ })=>{$(# [$attrs ])* $vis  enum $ident $($def_generics )* $(where $($where_clause )*)? {$($(# [$variant_attrs ])* $variant $({$($field : $field_ty ),+ })? ),+ }$crate ::  __pin_project_internal ! {@  enum => make_proj_ty ; [$proj_vis ][$($proj_mut_ident )?][ make_proj_field_mut ][$ident ][$($impl_generics )*][$($ty_generics )*][$(where $($where_clause )*)?]{$($variant $({$($(# [$pin ])? $field : $field_ty ),+ })? ),+ }}$crate ::  __pin_project_internal ! {@  enum => make_proj_ty ; [$proj_vis ][$($proj_ref_ident )?][ make_proj_field_ref ][$ident ][$($impl_generics )*][$($ty_generics )*][$(where $($where_clause )*)?]{$($variant $({$($(# [$pin ])? $field : $field_ty ),+ })? ),+ }}$crate ::  __pin_project_internal ! {@  enum => make_proj_replace_ty ; [$proj_vis ][$($proj_replace_ident )?][ make_proj_field_replace ][$ident ][$($impl_generics )*][$($ty_generics )*][$(where $($where_clause )*)?]{$($variant $({$($(# [$pin ])? $field : $field_ty ),+ })? ),+ }}# [ allow ( single_use_lifetimes )]# [ allow ( clippy ::  unknown_clippy_lints )]# [ allow ( clippy ::  used_underscore_binding )] const _: ()= { impl <$($impl_generics )*> $ident <$($ty_generics )*> $(where $($where_clause )*)? {$crate ::  __pin_project_internal ! {@  enum => make_proj_method ; [$proj_vis ][$($proj_mut_ident )?][ project  get_unchecked_mut  mut ][$($ty_generics )*]{$($variant $({$($(# [$pin ])? $field ),+ })? ),+ }}$crate ::  __pin_project_internal ! {@  enum => make_proj_method ; [$proj_vis ][$($proj_ref_ident )?][ project_ref  get_ref ][$($ty_generics )*]{$($variant $({$($(# [$pin ])? $field ),+ })? ),+ }}$crate ::  __pin_project_internal ! {@  enum => make_proj_replace_method ; [$proj_vis ][$($proj_replace_ident )?][$($ty_generics )*]{$($variant $({$($(# [$pin ])? $field ),+ })? ),+ }}}$crate ::  __pin_project_internal ! {@  make_unpin_impl ; [$vis $ident ][$($impl_generics )*][$($ty_generics )*][$(where $($where_clause )*)?]$($variant : ($($($crate ::  __pin_project_internal ! (@  make_unpin_bound ; $(# [$pin ])? $field_ty )),+ )?)),+ }$crate ::  __pin_project_internal ! {@  make_drop_impl ; [$ident ][$($impl_generics )*][$($ty_generics )*][$(where $($where_clause )*)?]}}; }; (@  struct => make_proj_ty => unnamed ; [$proj_vis :  vis ][$_proj_ty_ident :  ident ][$proj_ty_ident :  ident ][$make_proj_field :  ident ][$ident :  ident ][$($impl_generics :  tt )*][$($ty_generics :  tt )*][$(where $($where_clause :  tt )* )?]$($field :  tt )* )=>{}; (@  struct => make_proj_ty => unnamed ; [$proj_vis :  vis ][][$proj_ty_ident :  ident ][$make_proj_field :  ident ][$ident :  ident ][$($impl_generics :  tt )*][$($ty_generics :  tt )*][$(where $($where_clause :  tt )* )?]$($field :  tt )* )=>{$crate ::  __pin_project_internal ! {@  struct => make_proj_ty => named ; [$proj_vis ][$proj_ty_ident ][$make_proj_field ][$ident ][$($impl_generics )*][$($ty_generics )*][$(where $($where_clause )*)?]$($field )* }}; (@  struct => make_proj_ty => named ; [$proj_vis :  vis ][$proj_ty_ident :  ident ][$make_proj_field :  ident ][$ident :  ident ][$($impl_generics :  tt )*][$($ty_generics :  tt )*][$(where $($where_clause :  tt )* )?]{$($(# [$pin :  ident ])? $field_vis :  vis $field :  ident : $field_ty :  ty ),+ })=>{# [ allow ( dead_code )]# [ allow ( single_use_lifetimes )]# [ allow ( clippy ::  unknown_clippy_lints )]# [ allow ( clippy ::  mut_mut )]# [ allow ( clippy ::  redundant_pub_crate )]# [ allow ( clippy ::  ref_option_ref )]# [ allow ( clippy ::  type_repetition_in_bounds )]$proj_vis  struct $proj_ty_ident < '__pin , $($impl_generics )*>  where $ident <$($ty_generics )*>: '__pin $(, $($where_clause )*)? {$($field_vis $field : $crate ::  __pin_project_internal ! (@$make_proj_field ; $(# [$pin ])? $field_ty )),+ }}; (@  struct => make_proj_ty => named ; [$proj_vis :  vis ][][$make_proj_field :  ident ][$ident :  ident ][$($impl_generics :  tt )*][$($ty_generics :  tt )*][$(where $($where_clause :  tt )* )?]$($field :  tt )* )=>{}; (@  struct => make_proj_replace_ty => unnamed ; [$proj_vis :  vis ][$_proj_ty_ident :  ident ][$proj_ty_ident :  ident ][$make_proj_field :  ident ][$ident :  ident ][$($impl_generics :  tt )*][$($ty_generics :  tt )*][$(where $($where_clause :  tt )* )?]$($field :  tt )* )=>{}; (@  struct => make_proj_replace_ty => unnamed ; [$proj_vis :  vis ][][$proj_ty_ident :  ident ][$make_proj_field :  ident ][$ident :  ident ][$($impl_generics :  tt )*][$($ty_generics :  tt )*][$(where $($where_clause :  tt )* )?]$($field :  tt )* )=>{}; (@  struct => make_proj_replace_ty => named ; [$proj_vis :  vis ][$proj_ty_ident :  ident ][$make_proj_field :  ident ][$ident :  ident ][$($impl_generics :  tt )*][$($ty_generics :  tt )*][$(where $($where_clause :  tt )* )?]{$($(# [$pin :  ident ])? $field_vis :  vis $field :  ident : $field_ty :  ty ),+ })=>{# [ allow ( dead_code )]# [ allow ( single_use_lifetimes )]# [ allow ( clippy ::  mut_mut )]# [ allow ( clippy ::  redundant_pub_crate )]# [ allow ( clippy ::  type_repetition_in_bounds )]$proj_vis  struct $proj_ty_ident <$($impl_generics )*>  where $($($where_clause )*)? {$($field_vis $field : $crate ::  __pin_project_internal ! (@$make_proj_field ; $(# [$pin ])? $field_ty )),+ }}; (@  struct => make_proj_replace_ty => named ; [$proj_vis :  vis ][][$make_proj_field :  ident ][$ident :  ident ][$($impl_generics :  tt )*][$($ty_generics :  tt )*][$(where $($where_clause :  tt )* )?]$($field :  tt )* )=>{}; (@  enum => make_proj_ty ; [$proj_vis :  vis ][$proj_ty_ident :  ident ][$make_proj_field :  ident ][$ident :  ident ][$($impl_generics :  tt )*][$($ty_generics :  tt )*][$(where $($where_clause :  tt )* )?]{$($variant :  ident $({$($(# [$pin :  ident ])? $field :  ident : $field_ty :  ty ),+ })? ),+ })=>{# [ allow ( dead_code )]# [ allow ( single_use_lifetimes )]# [ allow ( clippy ::  unknown_clippy_lints )]# [ allow ( clippy ::  mut_mut )]# [ allow ( clippy ::  redundant_pub_crate )]# [ allow ( clippy ::  ref_option_ref )]# [ allow ( clippy ::  type_repetition_in_bounds )]$proj_vis  enum $proj_ty_ident < '__pin , $($impl_generics )*>  where $ident <$($ty_generics )*>: '__pin $(, $($where_clause )*)? {$($variant $({$($field : $crate ::  __pin_project_internal ! (@$make_proj_field ; $(# [$pin ])? $field_ty )),+ })? ),+ }}; (@  enum => make_proj_ty ; [$proj_vis :  vis ][][$make_proj_field :  ident ][$ident :  ident ][$($impl_generics :  tt )*][$($ty_generics :  tt )*][$(where $($where_clause :  tt )* )?]$($variant :  tt )* )=>{}; (@  enum => make_proj_replace_ty ; [$proj_vis :  vis ][$proj_ty_ident :  ident ][$make_proj_field :  ident ][$ident :  ident ][$($impl_generics :  tt )*][$($ty_generics :  tt )*][$(where $($where_clause :  tt )* )?]{$($variant :  ident $({$($(# [$pin :  ident ])? $field :  ident : $field_ty :  ty ),+ })? ),+ })=>{# [ allow ( dead_code )]# [ allow ( single_use_lifetimes )]# [ allow ( clippy ::  mut_mut )]# [ allow ( clippy ::  redundant_pub_crate )]# [ allow ( clippy ::  type_repetition_in_bounds )]$proj_vis  enum $proj_ty_ident <$($impl_generics )*>  where $($($where_clause )*)? {$($variant $({$($field : $crate ::  __pin_project_internal ! (@$make_proj_field ; $(# [$pin ])? $field_ty )),+ })? ),+ }}; (@  enum => make_proj_replace_ty ; [$proj_vis :  vis ][][$make_proj_field :  ident ][$ident :  ident ][$($impl_generics :  tt )*][$($ty_generics :  tt )*][$(where $($where_clause :  tt )* )?]$($variant :  tt )* )=>{}; (@  make_proj_replace_block ; [$($proj_path :  tt )+]{$($(# [$pin :  ident ])? $field_vis :  vis $field :  ident ),+ })=>{ let  result = $($proj_path )* {$($field : $crate ::  __pin_project_internal ! (@  make_replace_field_proj ; $(# [$pin ])? $field )),+ }; {($($crate ::  __pin_project_internal ! (@  make_unsafe_drop_in_place_guard ; $(# [$pin ])? $field ), )* ); } result }; (@  make_proj_replace_block ; [$($proj_path :  tt )+])=>{$($proj_path )* }; (@  struct => make_proj_method ; [$proj_vis :  vis ][$proj_ty_ident :  ident ][$_proj_ty_ident :  ident ][$method_ident :  ident $get_method :  ident $($mut :  ident )?][$($ty_generics :  tt )*]{$($(# [$pin :  ident ])? $field_vis :  vis $field :  ident ),+ })=>{$proj_vis  fn $method_ident < '__pin > ( self : $crate ::  __private ::  Pin <& '__pin $($mut )?  Self >, )-> $proj_ty_ident < '__pin , $($ty_generics )*> { unsafe { let  Self {$($field ),* }=  self .$get_method (); $proj_ty_ident {$($field : $crate ::  __pin_project_internal ! (@  make_unsafe_field_proj ; $(# [$pin ])? $field )),+ }}}}; (@  struct => make_proj_method ; [$proj_vis :  vis ][][$proj_ty_ident :  ident ][$method_ident :  ident $get_method :  ident $($mut :  ident )?][$($ty_generics :  tt )*]$($variant :  tt )* )=>{$crate ::  __pin_project_internal ! {@  struct => make_proj_method ; [$proj_vis ][$proj_ty_ident ][$proj_ty_ident ][$method_ident $get_method $($mut )?][$($ty_generics )*]$($variant )* }}; (@  struct => make_proj_replace_method ; [$proj_vis :  vis ][$proj_ty_ident :  ident ][$_proj_ty_ident :  ident ][$($ty_generics :  tt )*]{$($(# [$pin :  ident ])? $field_vis :  vis $field :  ident ),+ })=>{$proj_vis  fn  project_replace ( self : $crate ::  __private ::  Pin <&  mut  Self >,  replacement :  Self , )-> $proj_ty_ident <$($ty_generics )*> { unsafe { let  __self_ptr : *  mut  Self =  self .  get_unchecked_mut ();  let  __guard = $crate ::  __private ::  UnsafeOverwriteGuard { target :  __self_ptr ,  value : $crate ::  __private ::  ManuallyDrop ::  new ( replacement ), };  let  Self {$($field ),* }= &  mut *  __self_ptr ; $crate ::  __pin_project_internal ! {@  make_proj_replace_block ; [$proj_ty_ident ]{$($(# [$pin ])? $field ),+ }}}}}; (@  struct => make_proj_replace_method ; [$proj_vis :  vis ][][$proj_ty_ident :  ident ][$($ty_generics :  tt )*]$($variant :  tt )* )=>{}; (@  enum => make_proj_method ; [$proj_vis :  vis ][$proj_ty_ident :  ident ][$method_ident :  ident $get_method :  ident $($mut :  ident )?][$($ty_generics :  tt )*]{$($variant :  ident $({$($(# [$pin :  ident ])? $field :  ident ),+ })? ),+ })=>{$proj_vis  fn $method_ident < '__pin > ( self : $crate ::  __private ::  Pin <& '__pin $($mut )?  Self >, )-> $proj_ty_ident < '__pin , $($ty_generics )*> { unsafe { match  self .$get_method (){$(Self ::$variant $({$($field ),+ })? =>{$proj_ty_ident ::$variant $({$($field : $crate ::  __pin_project_internal ! (@  make_unsafe_field_proj ; $(# [$pin ])? $field )),+ })? }),+ }}}}; (@  enum => make_proj_method ; [$proj_vis :  vis ][][$method_ident :  ident $get_method :  ident $($mut :  ident )?][$($ty_generics :  tt )*]$($variant :  tt )* )=>{}; (@  enum => make_proj_replace_method ; [$proj_vis :  vis ][$proj_ty_ident :  ident ][$($ty_generics :  tt )*]{$($variant :  ident $({$($(# [$pin :  ident ])? $field :  ident ),+ })? ),+ })=>{$proj_vis  fn  project_replace ( self : $crate ::  __private ::  Pin <&  mut  Self >,  replacement :  Self , )-> $proj_ty_ident <$($ty_generics )*> { unsafe { let  __self_ptr : *  mut  Self =  self .  get_unchecked_mut ();  let  __guard = $crate ::  __private ::  UnsafeOverwriteGuard { target :  __self_ptr ,  value : $crate ::  __private ::  ManuallyDrop ::  new ( replacement ), };  match &  mut *  __self_ptr {$(Self ::$variant $({$($field ),+ })? =>{$crate ::  __pin_project_internal ! {@  make_proj_replace_block ; [$proj_ty_ident :: $variant ]$({$($(# [$pin ])? $field ),+ })? }}),+ }}}}; (@  enum => make_proj_replace_method ; [$proj_vis :  vis ][][$($ty_generics :  tt )*]$($variant :  tt )* )=>{}; (@  make_unpin_impl ; [$vis :  vis $ident :  ident ][$($impl_generics :  tt )*][$($ty_generics :  tt )*][$(where $($where_clause :  tt )* )?]$($field :  tt )* )=>{# [ allow ( non_snake_case )]$vis  struct  __Origin < '__pin , $($impl_generics )*> $(where $($where_clause )*)? { __dummy_lifetime : $crate ::  __private ::  PhantomData <& '__pin ()>, $($field )* } impl < '__pin , $($impl_generics )*> $crate ::  __private ::  Unpin  for $ident <$($ty_generics )*>  where  __Origin < '__pin , $($ty_generics )*>: $crate ::  __private ::  Unpin $(, $($where_clause )*)? {}}; (@  make_drop_impl ; [$ident :  ident ][$($impl_generics :  tt )*][$($ty_generics :  tt )*][$(where $($where_clause :  tt )* )?])=>{ trait  MustNotImplDrop {}# [ allow ( clippy ::  drop_bounds ,  drop_bounds )] impl <  T : $crate ::  __private ::  Drop >  MustNotImplDrop  for  T {} impl <$($impl_generics )*>  MustNotImplDrop  for $ident <$($ty_generics )*> $(where $($where_clause )*)? {}}; (@  make_unpin_bound ; # [ pin ]$field_ty :  ty )=>{$field_ty }; (@  make_unpin_bound ; $field_ty :  ty )=>{$crate ::  __private ::  AlwaysUnpin <$field_ty > }; (@  make_unsafe_field_proj ; # [ pin ]$field :  ident )=>{$crate ::  __private ::  Pin ::  new_unchecked ($field )}; (@  make_unsafe_field_proj ; $field :  ident )=>{$field }; (@  make_replace_field_proj ; # [ pin ]$field :  ident )=>{$crate ::  __private ::  PhantomData }; (@  make_replace_field_proj ; $field :  ident )=>{$crate ::  __private ::  ptr ::  read ($field )}; (@  make_unsafe_drop_in_place_guard ; # [ pin ]$field :  ident )=>{$crate ::  __private ::  UnsafeDropInPlaceGuard ($field )}; (@  make_unsafe_drop_in_place_guard ; $field :  ident )=>{()}; (@  make_proj_field_mut ; # [ pin ]$field_ty :  ty )=>{$crate ::  __private ::  Pin <& '__pin  mut ($field_ty )> }; (@  make_proj_field_mut ; $field_ty :  ty )=>{& '__pin  mut ($field_ty )}; (@  make_proj_field_ref ; # [ pin ]$field_ty :  ty )=>{$crate ::  __private ::  Pin <& '__pin ($field_ty )> }; (@  make_proj_field_ref ; $field_ty :  ty )=>{& '__pin ($field_ty )}; (@  make_proj_field_replace ; # [ pin ]$field_ty :  ty )=>{$crate ::  __private ::  PhantomData <$field_ty > }; (@  make_proj_field_replace ; $field_ty :  ty )=>{$field_ty }; ([$($proj_mut_ident :  ident )?][$($proj_ref_ident :  ident )?][$($proj_replace_ident :  ident )?]$(# [$attrs :  meta ])*  pub  struct $ident :  ident $(< $($lifetime :  lifetime $(: $lifetime_bound :  lifetime )? ),* $(,)? $($generics :  ident $(: $generics_bound :  path )? $(: ?$generics_unsized_bound :  path )? $(: $generics_lifetime_bound :  lifetime )? $(= $generics_default :  ty )? ),* $(,)? >)? $(where $($where_clause_ty :  ty $(: $where_clause_bound :  path )? $(: ?$where_clause_unsized_bound :  path )? $(: $where_clause_lifetime_bound :  lifetime )? ),* $(,)? )? {$($(# [$pin :  ident ])? $field_vis :  vis $field :  ident : $field_ty :  ty ),+ $(,)? })=>{$crate ::  __pin_project_internal ! {@  struct => internal ; [$($proj_mut_ident )?][$($proj_ref_ident )?][$($proj_replace_ident )?][ pub ( crate )][$(# [$attrs ])*  pub  struct $ident ][$(< $($lifetime $(: $lifetime_bound )? ,)* $($generics $(: $generics_bound )? $(: ?$generics_unsized_bound )? $(: $generics_lifetime_bound )? $(= $generics_default )? ),* >)?][$($($lifetime $(: $lifetime_bound )? ,)* $($generics $(: $generics_bound )? $(: ?$generics_unsized_bound )? $(: $generics_lifetime_bound )? ),* )?][$($($lifetime ,)* $($generics ),* )?][$(where $($where_clause_ty $(: $where_clause_bound )? $(: ?$where_clause_unsized_bound )? $(: $where_clause_lifetime_bound )? ),* )?]{$($(# [$pin ])? $field_vis $field : $field_ty ),+ }}}; ([$($proj_mut_ident :  ident )?][$($proj_ref_ident :  ident )?][$($proj_replace_ident :  ident )?]$(# [$attrs :  meta ])* $vis :  vis  struct $ident :  ident $(< $($lifetime :  lifetime $(: $lifetime_bound :  lifetime )? ),* $(,)? $($generics :  ident $(: $generics_bound :  path )? $(: ?$generics_unsized_bound :  path )? $(: $generics_lifetime_bound :  lifetime )? $(= $generics_default :  ty )? ),* $(,)? >)? $(where $($where_clause_ty :  ty $(: $where_clause_bound :  path )? $(: ?$where_clause_unsized_bound :  path )? $(: $where_clause_lifetime_bound :  lifetime )? ),* $(,)? )? {$($(# [$pin :  ident ])? $field_vis :  vis $field :  ident : $field_ty :  ty ),+ $(,)? })=>{$crate ::  __pin_project_internal ! {@  struct => internal ; [$($proj_mut_ident )?][$($proj_ref_ident )?][$($proj_replace_ident )?][$vis ][$(# [$attrs ])* $vis  struct $ident ][$(< $($lifetime $(: $lifetime_bound )? ,)* $($generics $(: $generics_bound )? $(: ?$generics_unsized_bound )? $(: $generics_lifetime_bound )? $(= $generics_default )? ),* >)?][$($($lifetime $(: $lifetime_bound )? ,)* $($generics $(: $generics_bound )? $(: ?$generics_unsized_bound )? $(: $generics_lifetime_bound )? ),* )?][$($($lifetime ,)* $($generics ),* )?][$(where $($where_clause_ty $(: $where_clause_bound )? $(: ?$where_clause_unsized_bound )? $(: $where_clause_lifetime_bound )? ),* )?]{$($(# [$pin ])? $field_vis $field : $field_ty ),+ }}}; ([$($proj_mut_ident :  ident )?][$($proj_ref_ident :  ident )?][$($proj_replace_ident :  ident )?]$(# [$attrs :  meta ])*  pub  enum $ident :  ident $(< $($lifetime :  lifetime $(: $lifetime_bound :  lifetime )? ),* $(,)? $($generics :  ident $(: $generics_bound :  path )? $(: ?$generics_unsized_bound :  path )? $(: $generics_lifetime_bound :  lifetime )? $(= $generics_default :  ty )? ),* $(,)? >)? $(where $($where_clause_ty :  ty $(: $where_clause_bound :  path )? $(: ?$where_clause_unsized_bound :  path )? $(: $where_clause_lifetime_bound :  lifetime )? ),* $(,)? )? {$($(# [$variant_attrs :  meta ])* $variant :  ident $({$($(# [$pin :  ident ])? $field :  ident : $field_ty :  ty ),+ $(,)? })? ),+ $(,)? })=>{$crate ::  __pin_project_internal ! {@  enum => internal ; [$($proj_mut_ident )?][$($proj_ref_ident )?][$($proj_replace_ident )?][ pub ( crate )][$(# [$attrs ])*  pub  enum $ident ][$(< $($lifetime $(: $lifetime_bound )? ,)* $($generics $(: $generics_bound )? $(: ?$generics_unsized_bound )? $(: $generics_lifetime_bound )? $(= $generics_default )? ),* >)?][$($($lifetime $(: $lifetime_bound )? ,)* $($generics $(: $generics_bound )? $(: ?$generics_unsized_bound )? $(: $generics_lifetime_bound )? ),* )?][$($($lifetime ,)* $($generics ),* )?][$(where $($where_clause_ty $(: $where_clause_bound )? $(: ?$where_clause_unsized_bound )? $(: $where_clause_lifetime_bound )? ),* )?]{$($(# [$variant_attrs ])* $variant $({$($(# [$pin ])? $field : $field_ty ),+ })? ),+ }}}; ([$($proj_mut_ident :  ident )?][$($proj_ref_ident :  ident )?][$($proj_replace_ident :  ident )?]$(# [$attrs :  meta ])* $vis :  vis  enum $ident :  ident $(< $($lifetime :  lifetime $(: $lifetime_bound :  lifetime )? ),* $(,)? $($generics :  ident $(: $generics_bound :  path )? $(: ?$generics_unsized_bound :  path )? $(: $generics_lifetime_bound :  lifetime )? $(= $generics_default :  ty )? ),* $(,)? >)? $(where $($where_clause_ty :  ty $(: $where_clause_bound :  path )? $(: ?$where_clause_unsized_bound :  path )? $(: $where_clause_lifetime_bound :  lifetime )? ),* $(,)? )? {$($(# [$variant_attrs :  meta ])* $variant :  ident $({$($(# [$pin :  ident ])? $field :  ident : $field_ty :  ty ),+ $(,)? })? ),+ $(,)? })=>{$crate ::  __pin_project_internal ! {@  enum => internal ; [$($proj_mut_ident )?][$($proj_ref_ident )?][$($proj_replace_ident )?][$vis ][$(# [$attrs ])* $vis  enum $ident ][$(< $($lifetime $(: $lifetime_bound )? ,)* $($generics $(: $generics_bound )? $(: ?$generics_unsized_bound )? $(: $generics_lifetime_bound )? $(= $generics_default )? ),* >)?][$($($lifetime $(: $lifetime_bound )? ,)* $($generics $(: $generics_bound )? $(: ?$generics_unsized_bound )? $(: $generics_lifetime_bound )? ),* )?][$($($lifetime ,)* $($generics ),* )?][$(where $($where_clause_ty $(: $where_clause_bound )? $(: ?$where_clause_unsized_bound )? $(: $where_clause_lifetime_bound )? ),* )?]{$($(# [$variant_attrs ])* $variant $({$($(# [$pin ])? $field : $field_ty ),+ })? ),+ }}}; }
+macro_rules! __ra_macro_fixture175 {($t :  ty , $example :  tt )=>{ impl  AtomicCell <$t > {# [ doc =  " Increments the current value by `val` and returns the previous value." ]# [ doc =  "" ]# [ doc =  " The addition wraps on overflow." ]# [ doc =  "" ]# [ doc =  " # Examples" ]# [ doc =  "" ]# [ doc =  " ```" ]# [ doc =  " use crossbeam_utils::atomic::AtomicCell;" ]# [ doc =  "" ]# [ doc = $example ]# [ doc =  "" ]# [ doc =  " assert_eq!(a.fetch_add(3), 7);" ]# [ doc =  " assert_eq!(a.load(), 10);" ]# [ doc =  " ```" ]# [ inline ] pub  fn  fetch_add (&  self ,  val : $t )-> $t { if  can_transmute ::<$t ,  atomic ::  AtomicUsize > (){ let  a =  unsafe {&* ( self .  value .  get () as *  const  atomic ::  AtomicUsize )};  a .  fetch_add ( val  as  usize ,  Ordering ::  AcqRel ) as $t } else { let  _guard =  lock ( self .  value .  get () as  usize ).  write ();  let  value =  unsafe {&  mut * ( self .  value .  get ())};  let  old = *  value ; *  value =  value .  wrapping_add ( val );  old }}# [ doc =  " Decrements the current value by `val` and returns the previous value." ]# [ doc =  "" ]# [ doc =  " The subtraction wraps on overflow." ]# [ doc =  "" ]# [ doc =  " # Examples" ]# [ doc =  "" ]# [ doc =  " ```" ]# [ doc =  " use crossbeam_utils::atomic::AtomicCell;" ]# [ doc =  "" ]# [ doc = $example ]# [ doc =  "" ]# [ doc =  " assert_eq!(a.fetch_sub(3), 7);" ]# [ doc =  " assert_eq!(a.load(), 4);" ]# [ doc =  " ```" ]# [ inline ] pub  fn  fetch_sub (&  self ,  val : $t )-> $t { if  can_transmute ::<$t ,  atomic ::  AtomicUsize > (){ let  a =  unsafe {&* ( self .  value .  get () as *  const  atomic ::  AtomicUsize )};  a .  fetch_sub ( val  as  usize ,  Ordering ::  AcqRel ) as $t } else { let  _guard =  lock ( self .  value .  get () as  usize ).  write ();  let  value =  unsafe {&  mut * ( self .  value .  get ())};  let  old = *  value ; *  value =  value .  wrapping_sub ( val );  old }}# [ doc =  " Applies bitwise \\\"and\\\" to the current value and returns the previous value." ]# [ doc =  "" ]# [ doc =  " # Examples" ]# [ doc =  "" ]# [ doc =  " ```" ]# [ doc =  " use crossbeam_utils::atomic::AtomicCell;" ]# [ doc =  "" ]# [ doc = $example ]# [ doc =  "" ]# [ doc =  " assert_eq!(a.fetch_and(3), 7);" ]# [ doc =  " assert_eq!(a.load(), 3);" ]# [ doc =  " ```" ]# [ inline ] pub  fn  fetch_and (&  self ,  val : $t )-> $t { if  can_transmute ::<$t ,  atomic ::  AtomicUsize > (){ let  a =  unsafe {&* ( self .  value .  get () as *  const  atomic ::  AtomicUsize )};  a .  fetch_and ( val  as  usize ,  Ordering ::  AcqRel ) as $t } else { let  _guard =  lock ( self .  value .  get () as  usize ).  write ();  let  value =  unsafe {&  mut * ( self .  value .  get ())};  let  old = *  value ; *  value &=  val ;  old }}# [ doc =  " Applies bitwise \\\"or\\\" to the current value and returns the previous value." ]# [ doc =  "" ]# [ doc =  " # Examples" ]# [ doc =  "" ]# [ doc =  " ```" ]# [ doc =  " use crossbeam_utils::atomic::AtomicCell;" ]# [ doc =  "" ]# [ doc = $example ]# [ doc =  "" ]# [ doc =  " assert_eq!(a.fetch_or(16), 7);" ]# [ doc =  " assert_eq!(a.load(), 23);" ]# [ doc =  " ```" ]# [ inline ] pub  fn  fetch_or (&  self ,  val : $t )-> $t { if  can_transmute ::<$t ,  atomic ::  AtomicUsize > (){ let  a =  unsafe {&* ( self .  value .  get () as *  const  atomic ::  AtomicUsize )};  a .  fetch_or ( val  as  usize ,  Ordering ::  AcqRel ) as $t } else { let  _guard =  lock ( self .  value .  get () as  usize ).  write ();  let  value =  unsafe {&  mut * ( self .  value .  get ())};  let  old = *  value ; *  value |=  val ;  old }}# [ doc =  " Applies bitwise \\\"xor\\\" to the current value and returns the previous value." ]# [ doc =  "" ]# [ doc =  " # Examples" ]# [ doc =  "" ]# [ doc =  " ```" ]# [ doc =  " use crossbeam_utils::atomic::AtomicCell;" ]# [ doc =  "" ]# [ doc = $example ]# [ doc =  "" ]# [ doc =  " assert_eq!(a.fetch_xor(2), 7);" ]# [ doc =  " assert_eq!(a.load(), 5);" ]# [ doc =  " ```" ]# [ inline ] pub  fn  fetch_xor (&  self ,  val : $t )-> $t { if  can_transmute ::<$t ,  atomic ::  AtomicUsize > (){ let  a =  unsafe {&* ( self .  value .  get () as *  const  atomic ::  AtomicUsize )};  a .  fetch_xor ( val  as  usize ,  Ordering ::  AcqRel ) as $t } else { let  _guard =  lock ( self .  value .  get () as  usize ).  write ();  let  value =  unsafe {&  mut * ( self .  value .  get ())};  let  old = *  value ; *  value ^=  val ;  old }}}}; ($t :  ty , $atomic :  ty , $example :  tt )=>{ impl  AtomicCell <$t > {# [ doc =  " Increments the current value by `val` and returns the previous value." ]# [ doc =  "" ]# [ doc =  " The addition wraps on overflow." ]# [ doc =  "" ]# [ doc =  " # Examples" ]# [ doc =  "" ]# [ doc =  " ```" ]# [ doc =  " use crossbeam_utils::atomic::AtomicCell;" ]# [ doc =  "" ]# [ doc = $example ]# [ doc =  "" ]# [ doc =  " assert_eq!(a.fetch_add(3), 7);" ]# [ doc =  " assert_eq!(a.load(), 10);" ]# [ doc =  " ```" ]# [ inline ] pub  fn  fetch_add (&  self ,  val : $t )-> $t { let  a =  unsafe {&* ( self .  value .  get () as *  const $atomic )};  a .  fetch_add ( val ,  Ordering ::  AcqRel )}# [ doc =  " Decrements the current value by `val` and returns the previous value." ]# [ doc =  "" ]# [ doc =  " The subtraction wraps on overflow." ]# [ doc =  "" ]# [ doc =  " # Examples" ]# [ doc =  "" ]# [ doc =  " ```" ]# [ doc =  " use crossbeam_utils::atomic::AtomicCell;" ]# [ doc =  "" ]# [ doc = $example ]# [ doc =  "" ]# [ doc =  " assert_eq!(a.fetch_sub(3), 7);" ]# [ doc =  " assert_eq!(a.load(), 4);" ]# [ doc =  " ```" ]# [ inline ] pub  fn  fetch_sub (&  self ,  val : $t )-> $t { let  a =  unsafe {&* ( self .  value .  get () as *  const $atomic )};  a .  fetch_sub ( val ,  Ordering ::  AcqRel )}# [ doc =  " Applies bitwise \\\"and\\\" to the current value and returns the previous value." ]# [ doc =  "" ]# [ doc =  " # Examples" ]# [ doc =  "" ]# [ doc =  " ```" ]# [ doc =  " use crossbeam_utils::atomic::AtomicCell;" ]# [ doc =  "" ]# [ doc = $example ]# [ doc =  "" ]# [ doc =  " assert_eq!(a.fetch_and(3), 7);" ]# [ doc =  " assert_eq!(a.load(), 3);" ]# [ doc =  " ```" ]# [ inline ] pub  fn  fetch_and (&  self ,  val : $t )-> $t { let  a =  unsafe {&* ( self .  value .  get () as *  const $atomic )};  a .  fetch_and ( val ,  Ordering ::  AcqRel )}# [ doc =  " Applies bitwise \\\"or\\\" to the current value and returns the previous value." ]# [ doc =  "" ]# [ doc =  " # Examples" ]# [ doc =  "" ]# [ doc =  " ```" ]# [ doc =  " use crossbeam_utils::atomic::AtomicCell;" ]# [ doc =  "" ]# [ doc = $example ]# [ doc =  "" ]# [ doc =  " assert_eq!(a.fetch_or(16), 7);" ]# [ doc =  " assert_eq!(a.load(), 23);" ]# [ doc =  " ```" ]# [ inline ] pub  fn  fetch_or (&  self ,  val : $t )-> $t { let  a =  unsafe {&* ( self .  value .  get () as *  const $atomic )};  a .  fetch_or ( val ,  Ordering ::  AcqRel )}# [ doc =  " Applies bitwise \\\"xor\\\" to the current value and returns the previous value." ]# [ doc =  "" ]# [ doc =  " # Examples" ]# [ doc =  "" ]# [ doc =  " ```" ]# [ doc =  " use crossbeam_utils::atomic::AtomicCell;" ]# [ doc =  "" ]# [ doc = $example ]# [ doc =  "" ]# [ doc =  " assert_eq!(a.fetch_xor(2), 7);" ]# [ doc =  " assert_eq!(a.load(), 5);" ]# [ doc =  " ```" ]# [ inline ] pub  fn  fetch_xor (&  self ,  val : $t )-> $t { let  a =  unsafe {&* ( self .  value .  get () as *  const $atomic )};  a .  fetch_xor ( val ,  Ordering ::  AcqRel )}}}; }
+macro_rules! __ra_macro_fixture176 {($atomic :  ident , $val :  ty )=>{ impl  AtomicConsume  for ::  core ::  sync ::  atomic ::$atomic { type  Val = $val ;  impl_consume ! (); }}; }
+macro_rules! __ra_macro_fixture177 {($t :  ty , $min :  expr , $max :  expr )=>{ impl  Bounded  for $t {# [ inline ] fn  min_value ()-> $t {$min }# [ inline ] fn  max_value ()-> $t {$max }}}; }
+macro_rules! __ra_macro_fixture178 {($m :  ident )=>{ for_each_tuple_ ! {$m !!  A ,  B ,  C ,  D ,  E ,  F ,  G ,  H ,  I ,  J ,  K ,  L ,  M ,  N ,  O ,  P ,  Q ,  R ,  S ,  T , }}; }
+macro_rules! __ra_macro_fixture179 {($T :  ident )=>{ impl  ToPrimitive  for $T { impl_to_primitive_int_to_int ! {$T :  fn  to_isize ->  isize ;  fn  to_i8 ->  i8 ;  fn  to_i16 ->  i16 ;  fn  to_i32 ->  i32 ;  fn  to_i64 ->  i64 ; # [ cfg ( has_i128 )] fn  to_i128 ->  i128 ; } impl_to_primitive_int_to_uint ! {$T :  fn  to_usize ->  usize ;  fn  to_u8 ->  u8 ;  fn  to_u16 ->  u16 ;  fn  to_u32 ->  u32 ;  fn  to_u64 ->  u64 ; # [ cfg ( has_i128 )] fn  to_u128 ->  u128 ; }# [ inline ] fn  to_f32 (&  self )->  Option <  f32 > { Some (*  self  as  f32 )}# [ inline ] fn  to_f64 (&  self )->  Option <  f64 > { Some (*  self  as  f64 )}}}; }
+macro_rules! __ra_macro_fixture180 {($T :  ident )=>{ impl  ToPrimitive  for $T { impl_to_primitive_uint_to_int ! {$T :  fn  to_isize ->  isize ;  fn  to_i8 ->  i8 ;  fn  to_i16 ->  i16 ;  fn  to_i32 ->  i32 ;  fn  to_i64 ->  i64 ; # [ cfg ( has_i128 )] fn  to_i128 ->  i128 ; } impl_to_primitive_uint_to_uint ! {$T :  fn  to_usize ->  usize ;  fn  to_u8 ->  u8 ;  fn  to_u16 ->  u16 ;  fn  to_u32 ->  u32 ;  fn  to_u64 ->  u64 ; # [ cfg ( has_i128 )] fn  to_u128 ->  u128 ; }# [ inline ] fn  to_f32 (&  self )->  Option <  f32 > { Some (*  self  as  f32 )}# [ inline ] fn  to_f64 (&  self )->  Option <  f64 > { Some (*  self  as  f64 )}}}; }
+macro_rules! __ra_macro_fixture181 {($T :  ident )=>{ impl  ToPrimitive  for $T { impl_to_primitive_float_to_signed_int ! {$T :  fn  to_isize ->  isize ;  fn  to_i8 ->  i8 ;  fn  to_i16 ->  i16 ;  fn  to_i32 ->  i32 ;  fn  to_i64 ->  i64 ; # [ cfg ( has_i128 )] fn  to_i128 ->  i128 ; } impl_to_primitive_float_to_unsigned_int ! {$T :  fn  to_usize ->  usize ;  fn  to_u8 ->  u8 ;  fn  to_u16 ->  u16 ;  fn  to_u32 ->  u32 ;  fn  to_u64 ->  u64 ; # [ cfg ( has_i128 )] fn  to_u128 ->  u128 ; } impl_to_primitive_float_to_float ! {$T :  fn  to_f32 ->  f32 ;  fn  to_f64 ->  f64 ; }}}; }
+macro_rules! __ra_macro_fixture182 {($T :  ty , $to_ty :  ident )=>{# [ allow ( deprecated )] impl  FromPrimitive  for $T {# [ inline ] fn  from_isize ( n :  isize )->  Option <$T > { n .$to_ty ()}# [ inline ] fn  from_i8 ( n :  i8 )->  Option <$T > { n .$to_ty ()}# [ inline ] fn  from_i16 ( n :  i16 )->  Option <$T > { n .$to_ty ()}# [ inline ] fn  from_i32 ( n :  i32 )->  Option <$T > { n .$to_ty ()}# [ inline ] fn  from_i64 ( n :  i64 )->  Option <$T > { n .$to_ty ()}# [ cfg ( has_i128 )]# [ inline ] fn  from_i128 ( n :  i128 )->  Option <$T > { n .$to_ty ()}# [ inline ] fn  from_usize ( n :  usize )->  Option <$T > { n .$to_ty ()}# [ inline ] fn  from_u8 ( n :  u8 )->  Option <$T > { n .$to_ty ()}# [ inline ] fn  from_u16 ( n :  u16 )->  Option <$T > { n .$to_ty ()}# [ inline ] fn  from_u32 ( n :  u32 )->  Option <$T > { n .$to_ty ()}# [ inline ] fn  from_u64 ( n :  u64 )->  Option <$T > { n .$to_ty ()}# [ cfg ( has_i128 )]# [ inline ] fn  from_u128 ( n :  u128 )->  Option <$T > { n .$to_ty ()}# [ inline ] fn  from_f32 ( n :  f32 )->  Option <$T > { n .$to_ty ()}# [ inline ] fn  from_f64 ( n :  f64 )->  Option <$T > { n .$to_ty ()}}}; }
+macro_rules! __ra_macro_fixture183 {($T :  ty , $conv :  ident )=>{ impl  NumCast  for $T {# [ inline ]# [ allow ( deprecated )] fn  from <  N :  ToPrimitive > ( n :  N )->  Option <$T > { n .$conv ()}}}; }
+macro_rules! __ra_macro_fixture184 {(@ $T :  ty =>$(# [$cfg :  meta ])*  impl $U :  ty )=>{$(# [$cfg ])*  impl  AsPrimitive <$U >  for $T {# [ inline ] fn  as_ ( self )-> $U { self  as $U }}}; (@ $T :  ty =>{$($U :  ty ),* })=>{$(impl_as_primitive ! (@ $T => impl $U ); )*}; ($T :  ty =>{$($U :  ty ),* })=>{ impl_as_primitive ! (@ $T =>{$($U ),* });  impl_as_primitive ! (@ $T =>{ u8 ,  u16 ,  u32 ,  u64 ,  usize });  impl_as_primitive ! (@ $T =># [ cfg ( has_i128 )] impl  u128 );  impl_as_primitive ! (@ $T =>{ i8 ,  i16 ,  i32 ,  i64 ,  isize });  impl_as_primitive ! (@ $T =># [ cfg ( has_i128 )] impl  i128 ); }; }
+macro_rules! __ra_macro_fixture185 {($(# [$doc :  meta ]$constant :  ident ,)+)=>(# [ allow ( non_snake_case )] pub  trait  FloatConst {$(# [$doc ] fn $constant ()->  Self ;)+ # [ doc =  "Return the full circle constant `τ`." ]# [ inline ] fn  TAU ()->  Self  where  Self :  Sized +  Add <  Self ,  Output =  Self >{ Self ::  PI ()+  Self ::  PI ()}# [ doc =  "Return `log10(2.0)`." ]# [ inline ] fn  LOG10_2 ()->  Self  where  Self :  Sized +  Div <  Self ,  Output =  Self >{ Self ::  LN_2 ()/  Self ::  LN_10 ()}# [ doc =  "Return `log2(10.0)`." ]# [ inline ] fn  LOG2_10 ()->  Self  where  Self :  Sized +  Div <  Self ,  Output =  Self >{ Self ::  LN_10 ()/  Self ::  LN_2 ()}} float_const_impl ! {@  float  f32 , $($constant ,)+ } float_const_impl ! {@  float  f64 , $($constant ,)+ }); (@  float $T :  ident , $($constant :  ident ,)+)=>( impl  FloatConst  for $T { constant ! {$($constant ()-> $T ::  consts ::$constant ; )+  TAU ()->  6.28318530717958647692528676655900577 ;  LOG10_2 ()->  0.301029995663981195213738894724493027 ;  LOG2_10 ()->  3.32192809488736234787031942948939018 ; }}); }
+macro_rules! __ra_macro_fixture186 {($t :  ty , $v :  expr )=>{ impl  Zero  for $t {# [ inline ] fn  zero ()-> $t {$v }# [ inline ] fn  is_zero (&  self )->  bool {*  self == $v }}}; }
+macro_rules! __ra_macro_fixture187 {($t :  ty , $v :  expr )=>{ impl  One  for $t {# [ inline ] fn  one ()-> $t {$v }# [ inline ] fn  is_one (&  self )->  bool {*  self == $v }}}; }
+macro_rules! __ra_macro_fixture188 {($T :  ty , $S :  ty , $U :  ty )=>{ impl  PrimInt  for $T {# [ inline ] fn  count_ones ( self )->  u32 {<$T >::  count_ones ( self )}# [ inline ] fn  count_zeros ( self )->  u32 {<$T >::  count_zeros ( self )}# [ inline ] fn  leading_zeros ( self )->  u32 {<$T >::  leading_zeros ( self )}# [ inline ] fn  trailing_zeros ( self )->  u32 {<$T >::  trailing_zeros ( self )}# [ inline ] fn  rotate_left ( self ,  n :  u32 )->  Self {<$T >::  rotate_left ( self ,  n )}# [ inline ] fn  rotate_right ( self ,  n :  u32 )->  Self {<$T >::  rotate_right ( self ,  n )}# [ inline ] fn  signed_shl ( self ,  n :  u32 )->  Self {(( self  as $S )<<  n ) as $T }# [ inline ] fn  signed_shr ( self ,  n :  u32 )->  Self {(( self  as $S )>>  n ) as $T }# [ inline ] fn  unsigned_shl ( self ,  n :  u32 )->  Self {(( self  as $U )<<  n ) as $T }# [ inline ] fn  unsigned_shr ( self ,  n :  u32 )->  Self {(( self  as $U )>>  n ) as $T }# [ inline ] fn  swap_bytes ( self )->  Self {<$T >::  swap_bytes ( self )}# [ inline ] fn  from_be ( x :  Self )->  Self {<$T >::  from_be ( x )}# [ inline ] fn  from_le ( x :  Self )->  Self {<$T >::  from_le ( x )}# [ inline ] fn  to_be ( self )->  Self {<$T >::  to_be ( self )}# [ inline ] fn  to_le ( self )->  Self {<$T >::  to_le ( self )}# [ inline ] fn  pow ( self ,  exp :  u32 )->  Self {<$T >::  pow ( self ,  exp )}}}; }
+macro_rules! __ra_macro_fixture189 {($trait_name :  ident , $method :  ident , $t :  ty )=>{ impl $trait_name  for $t {# [ inline ] fn $method (&  self ,  v : &$t )->  Option <$t > {<$t >::$method (*  self , *  v )}}}; }
+macro_rules! __ra_macro_fixture190 {($trait_name :  ident , $method :  ident , $t :  ty )=>{ impl $trait_name  for $t {# [ inline ] fn $method (&  self )->  Option <$t > {<$t >::$method (*  self )}}}; }
+macro_rules! __ra_macro_fixture191 {($trait_name :  ident , $method :  ident , $t :  ty )=>{ impl $trait_name  for $t {# [ inline ] fn $method (&  self ,  rhs :  u32 )->  Option <$t > {<$t >::$method (*  self ,  rhs )}}}; }
+macro_rules! __ra_macro_fixture192 {($trait_name :  ident  for $($t :  ty )*)=>{$(impl $trait_name  for $t { type  Output =  Self ; # [ inline ] fn  mul_add ( self ,  a :  Self ,  b :  Self )->  Self ::  Output {( self *  a )+  b }})*}}
+macro_rules! __ra_macro_fixture193 {($trait_name :  ident  for $($t :  ty )*)=>{$(impl $trait_name  for $t {# [ inline ] fn  mul_add_assign (&  mut  self ,  a :  Self ,  b :  Self ){*  self = (*  self *  a )+  b }})*}}
+macro_rules! __ra_macro_fixture194 {($trait_name :  ident , $method :  ident , $t :  ty )=>{ impl $trait_name  for $t {# [ inline ] fn $method (&  self ,  v : &  Self )-> ( Self ,  bool ){<$t >::$method (*  self , *  v )}}}; }
+macro_rules! __ra_macro_fixture195 {($trait_name :  ident  for $($t :  ty )*)=>{$(impl $trait_name  for $t {# [ inline ] fn  saturating_add ( self ,  v :  Self )->  Self { Self ::  saturating_add ( self ,  v )}# [ inline ] fn  saturating_sub ( self ,  v :  Self )->  Self { Self ::  saturating_sub ( self ,  v )}})*}}
+macro_rules! __ra_macro_fixture196 {($trait_name :  ident , $method :  ident , $t :  ty )=>{ impl $trait_name  for $t {# [ inline ] fn $method (&  self ,  v : &  Self )->  Self {<$t >::$method (*  self , *  v )}}}; }
+macro_rules! __ra_macro_fixture197 {($trait_name :  ident , $method :  ident , $t :  ty )=>{ impl $trait_name  for $t {# [ inline ] fn $method (&  self ,  v : &  Self )->  Self {<$t >::$method (*  self , *  v )}}}; ($trait_name :  ident , $method :  ident , $t :  ty , $rhs :  ty )=>{ impl $trait_name <$rhs >  for $t {# [ inline ] fn $method (&  self ,  v : &$rhs )->  Self {<$t >::$method (*  self , *  v )}}}; }
+macro_rules! __ra_macro_fixture198 {($trait_name :  ident , $method :  ident , $t :  ty )=>{ impl $trait_name  for $t {# [ inline ] fn $method (&  self )-> $t {<$t >::$method (*  self )}}}; }
+macro_rules! __ra_macro_fixture199 {($trait_name :  ident , $method :  ident , $t :  ty )=>{ impl $trait_name  for $t {# [ inline ] fn $method (&  self ,  rhs :  u32 )-> $t {<$t >::$method (*  self ,  rhs )}}}; }
+macro_rules! __ra_macro_fixture200 {($t :  ty )=>{ pow_impl ! ($t ,  u8 );  pow_impl ! ($t ,  usize ); }; ($t :  ty , $rhs :  ty )=>{ pow_impl ! ($t , $rhs ,  usize ,  pow ); }; ($t :  ty , $rhs :  ty , $desired_rhs :  ty , $method :  expr )=>{ impl  Pow <$rhs >  for $t { type  Output = $t ; # [ inline ] fn  pow ( self ,  rhs : $rhs )-> $t {($method )( self , <$desired_rhs >::  from ( rhs ))}} impl < 'a >  Pow <& 'a $rhs >  for $t { type  Output = $t ; # [ inline ] fn  pow ( self ,  rhs : & 'a $rhs )-> $t {($method )( self , <$desired_rhs >::  from (*  rhs ))}} impl < 'a >  Pow <$rhs >  for & 'a $t { type  Output = $t ; # [ inline ] fn  pow ( self ,  rhs : $rhs )-> $t {($method )(*  self , <$desired_rhs >::  from ( rhs ))}} impl < 'a , 'b >  Pow <& 'a $rhs >  for & 'b $t { type  Output = $t ; # [ inline ] fn  pow ( self ,  rhs : & 'a $rhs )-> $t {($method )(*  self , <$desired_rhs >::  from (*  rhs ))}}}; }
+macro_rules! __ra_macro_fixture201 {($($t :  ty )*)=>($(impl  Signed  for $t {# [ inline ] fn  abs (&  self )-> $t { if  self .  is_negative (){-*  self } else {*  self }}# [ inline ] fn  abs_sub (&  self ,  other : &$t )-> $t { if *  self <= *  other { 0 } else {*  self - *  other }}# [ inline ] fn  signum (&  self )-> $t { match *  self { n  if  n >  0 => 1 ,  0 => 0 , _ =>-  1 , }}# [ inline ] fn  is_positive (&  self )->  bool {*  self >  0 }# [ inline ] fn  is_negative (&  self )->  bool {*  self <  0 }})*)}
+macro_rules! __ra_macro_fixture202 {($t :  ty )=>{ impl  Signed  for $t {# [ doc =  " Computes the absolute value. Returns `NAN` if the number is `NAN`." ]# [ inline ] fn  abs (&  self )-> $t { FloatCore ::  abs (*  self )}# [ doc =  " The positive difference of two numbers. Returns `0.0` if the number is" ]# [ doc =  " less than or equal to `other`, otherwise the difference between`self`" ]# [ doc =  " and `other` is returned." ]# [ inline ] fn  abs_sub (&  self ,  other : &$t )-> $t { if *  self <= *  other { 0. } else {*  self - *  other }}# [ doc =  " # Returns" ]# [ doc =  "" ]# [ doc =  " - `1.0` if the number is positive, `+0.0` or `INFINITY`" ]# [ doc =  " - `-1.0` if the number is negative, `-0.0` or `NEG_INFINITY`" ]# [ doc =  " - `NAN` if the number is NaN" ]# [ inline ] fn  signum (&  self )-> $t { FloatCore ::  signum (*  self )}# [ doc =  " Returns `true` if the number is positive, including `+0.0` and `INFINITY`" ]# [ inline ] fn  is_positive (&  self )->  bool { FloatCore ::  is_sign_positive (*  self )}# [ doc =  " Returns `true` if the number is negative, including `-0.0` and `NEG_INFINITY`" ]# [ inline ] fn  is_negative (&  self )->  bool { FloatCore ::  is_sign_negative (*  self )}}}; }
+macro_rules! __ra_macro_fixture203 {($name :  ident  for $($t :  ty )*)=>($(impl $name  for $t {})*)}
+macro_rules! __ra_macro_fixture204 {($name :  ident  for $($t :  ty )*)=>($(impl $name  for $t { type  FromStrRadixErr = ::  core ::  num ::  ParseIntError ; # [ inline ] fn  from_str_radix ( s : &  str ,  radix :  u32 )->  Result <  Self , ::  core ::  num ::  ParseIntError > {<$t >::  from_str_radix ( s ,  radix )}})*)}
+macro_rules! __ra_macro_fixture205 {($name :  ident  for $($t :  ident )*)=>($(impl $name  for $t { type  FromStrRadixErr =  ParseFloatError ;  fn  from_str_radix ( src : &  str ,  radix :  u32 )->  Result <  Self ,  Self ::  FromStrRadixErr > { use  self ::  FloatErrorKind ::*;  use  self ::  ParseFloatError  as  PFE ;  match  src { "inf" => return  Ok ( core ::$t ::  INFINITY ),  "-inf" => return  Ok ( core ::$t ::  NEG_INFINITY ),  "NaN" => return  Ok ( core ::$t ::  NAN ), _ =>{}, } fn  slice_shift_char ( src : &  str )->  Option < ( char , &  str )> { let  mut  chars =  src .  chars ();  if  let  Some ( ch )=  chars .  next (){ Some (( ch ,  chars .  as_str ()))} else { None }} let ( is_positive ,  src )=  match  slice_shift_char ( src ){ None => return  Err ( PFE { kind :  Empty }),  Some (( '-' ,  "" ))=> return  Err ( PFE { kind :  Empty }),  Some (( '-' ,  src ))=>( false ,  src ),  Some ((_, _))=>( true ,  src ), };  let  mut  sig =  if  is_positive { 0.0 } else {-  0.0 };  let  mut  prev_sig =  sig ;  let  mut  cs =  src .  chars ().  enumerate ();  let  mut  exp_info =  None ::< ( char ,  usize )>;  for ( i ,  c ) in  cs .  by_ref (){ match  c .  to_digit ( radix ){ Some ( digit )=>{ sig =  sig * ( radix  as $t );  if  is_positive { sig =  sig + (( digit  as  isize ) as $t ); } else { sig =  sig - (( digit  as  isize ) as $t ); } if  prev_sig !=  0.0 { if  is_positive &&  sig <=  prev_sig { return  Ok ( core ::$t ::  INFINITY ); } if !  is_positive &&  sig >=  prev_sig { return  Ok ( core ::$t ::  NEG_INFINITY ); } if  is_positive && ( prev_sig != ( sig -  digit  as $t )/  radix  as $t ){ return  Ok ( core ::$t ::  INFINITY ); } if !  is_positive && ( prev_sig != ( sig +  digit  as $t )/  radix  as $t ){ return  Ok ( core ::$t ::  NEG_INFINITY ); }} prev_sig =  sig ; },  None => match  c { 'e' |  'E' |  'p' |  'P' =>{ exp_info =  Some (( c ,  i +  1 ));  break ; },  '.' =>{ break ; }, _ =>{ return  Err ( PFE { kind :  Invalid }); }, }, }} if  exp_info .  is_none (){ let  mut  power =  1.0 ;  for ( i ,  c ) in  cs .  by_ref (){ match  c .  to_digit ( radix ){ Some ( digit )=>{ power =  power / ( radix  as $t );  sig =  if  is_positive { sig + ( digit  as $t )*  power } else { sig - ( digit  as $t )*  power };  if  is_positive &&  sig <  prev_sig { return  Ok ( core ::$t ::  INFINITY ); } if !  is_positive &&  sig >  prev_sig { return  Ok ( core ::$t ::  NEG_INFINITY ); } prev_sig =  sig ; },  None => match  c { 'e' |  'E' |  'p' |  'P' =>{ exp_info =  Some (( c ,  i +  1 ));  break ; }, _ =>{ return  Err ( PFE { kind :  Invalid }); }, }, }}} let  exp =  match  exp_info { Some (( c ,  offset ))=>{ let  base =  match  c { 'E' |  'e'  if  radix ==  10 => 10.0 ,  'P' |  'p'  if  radix ==  16 => 2.0 , _ => return  Err ( PFE { kind :  Invalid }), };  let  src = &  src [ offset ..];  let ( is_positive ,  exp )=  match  slice_shift_char ( src ){ Some (( '-' ,  src ))=>( false ,  src .  parse ::<  usize > ()),  Some (( '+' ,  src ))=>( true ,  src .  parse ::<  usize > ()),  Some ((_, _))=>( true ,  src .  parse ::<  usize > ()),  None => return  Err ( PFE { kind :  Invalid }), }; # [ cfg ( feature =  "std" )] fn  pow ( base : $t ,  exp :  usize )-> $t { Float ::  powi ( base ,  exp  as  i32 )} match ( is_positive ,  exp ){( true ,  Ok ( exp ))=> pow ( base ,  exp ), ( false ,  Ok ( exp ))=> 1.0 /  pow ( base ,  exp ), (_,  Err (_))=> return  Err ( PFE { kind :  Invalid }), }},  None => 1.0 , };  Ok ( sig *  exp )}})*)}
+macro_rules! __ra_macro_fixture206 {($m :  ident !! )=>($m ! {}); ($m :  ident !! $h :  ident , $($t :  ident ,)* )=>($m ! {$h $($t )* } for_each_tuple_ ! {$m !! $($t ,)* }); }
+macro_rules! __ra_macro_fixture207 {($($name :  ident )* )=>( impl <$($name :  Bounded ,)*>  Bounded  for ($($name ,)*){# [ inline ] fn  min_value ()->  Self {($($name ::  min_value (),)*)}# [ inline ] fn  max_value ()->  Self {($($name ::  max_value (),)*)}}); }
+macro_rules! __ra_macro_fixture208 {($T :  ty , $U :  ty )=>{ impl  Roots  for $T {# [ inline ] fn  nth_root (&  self ,  n :  u32 )->  Self { if *  self >=  0 {(*  self  as $U ).  nth_root ( n ) as  Self } else { assert ! ( n .  is_odd (),  "even roots of a negative are imaginary" ); - (( self .  wrapping_neg () as $U ).  nth_root ( n ) as  Self )}}# [ inline ] fn  sqrt (&  self )->  Self { assert ! (*  self >=  0 ,  "the square root of a negative is imaginary" ); (*  self  as $U ).  sqrt () as  Self }# [ inline ] fn  cbrt (&  self )->  Self { if *  self >=  0 {(*  self  as $U ).  cbrt () as  Self } else {- (( self .  wrapping_neg () as $U ).  cbrt () as  Self )}}}}; }
+macro_rules! __ra_macro_fixture209 {($T :  ident )=>{ impl  Roots  for $T {# [ inline ] fn  nth_root (&  self ,  n :  u32 )->  Self { fn  go ( a : $T ,  n :  u32 )-> $T { match  n { 0 => panic ! ( "can't find a root of degree 0!" ),  1 => return  a ,  2 => return  a .  sqrt (),  3 => return  a .  cbrt (), _ =>(), } if  bits ::<$T > ()<=  n ||  a < ( 1 <<  n ){ return ( a >  0 ) as $T ; } if  bits ::<$T > ()>  64 { return  if  a <=  core ::  u64 ::  MAX  as $T {( a  as  u64 ).  nth_root ( n ) as $T } else { let  lo = ( a >>  n ).  nth_root ( n )<<  1 ;  let  hi =  lo +  1 ;  if  hi .  next_power_of_two ().  trailing_zeros ()*  n >=  bits ::<$T > (){ match  checked_pow ( hi ,  n  as  usize ){ Some ( x ) if  x <=  a => hi , _ => lo , }} else { if  hi .  pow ( n )<=  a { hi } else { lo }}}; }# [ cfg ( feature =  "std" )]# [ inline ] fn  guess ( x : $T ,  n :  u32 )-> $T { if  bits ::<$T > ()<=  32 ||  x <=  core ::  u32 ::  MAX  as $T { 1 << (( log2 ( x )+  n -  1 )/  n )} else {(( x  as  f64 ).  ln ()/  f64 ::  from ( n )).  exp () as $T }}# [ cfg ( not ( feature =  "std" ))]# [ inline ] fn  guess ( x : $T ,  n :  u32 )-> $T { 1 << (( log2 ( x )+  n -  1 )/  n )} let  n1 =  n -  1 ;  let  next = |  x : $T | { let  y =  match  checked_pow ( x ,  n1  as  usize ){ Some ( ax )=> a /  ax ,  None => 0 , }; ( y +  x *  n1  as $T )/  n  as $T };  fixpoint ( guess ( a ,  n ),  next )} go (*  self ,  n )}# [ inline ] fn  sqrt (&  self )->  Self { fn  go ( a : $T )-> $T { if  bits ::<$T > ()>  64 { return  if  a <=  core ::  u64 ::  MAX  as $T {( a  as  u64 ).  sqrt () as $T } else { let  lo = ( a >>  2u32 ).  sqrt ()<<  1 ;  let  hi =  lo +  1 ;  if  hi *  hi <=  a { hi } else { lo }}; } if  a <  4 { return ( a >  0 ) as $T ; }# [ cfg ( feature =  "std" )]# [ inline ] fn  guess ( x : $T )-> $T {( x  as  f64 ).  sqrt () as $T }# [ cfg ( not ( feature =  "std" ))]# [ inline ] fn  guess ( x : $T )-> $T { 1 << (( log2 ( x )+  1 )/  2 )} let  next = |  x : $T | ( a /  x +  x )>>  1 ;  fixpoint ( guess ( a ),  next )} go (*  self )}# [ inline ] fn  cbrt (&  self )->  Self { fn  go ( a : $T )-> $T { if  bits ::<$T > ()>  64 { return  if  a <=  core ::  u64 ::  MAX  as $T {( a  as  u64 ).  cbrt () as $T } else { let  lo = ( a >>  3u32 ).  cbrt ()<<  1 ;  let  hi =  lo +  1 ;  if  hi *  hi *  hi <=  a { hi } else { lo }}; } if  bits ::<$T > ()<=  32 { let  mut  x =  a ;  let  mut  y2 =  0 ;  let  mut  y =  0 ;  let  smax =  bits ::<$T > ()/  3 ;  for  s  in ( 0 ..  smax +  1 ).  rev (){ let  s =  s *  3 ;  y2 *=  4 ;  y *=  2 ;  let  b =  3 * ( y2 +  y )+  1 ;  if  x >>  s >=  b { x -=  b <<  s ;  y2 +=  2 *  y +  1 ;  y +=  1 ; }} return  y ; } if  a <  8 { return ( a >  0 ) as $T ; } if  a <=  core ::  u32 ::  MAX  as $T { return ( a  as  u32 ).  cbrt () as $T ; }# [ cfg ( feature =  "std" )]# [ inline ] fn  guess ( x : $T )-> $T {( x  as  f64 ).  cbrt () as $T }# [ cfg ( not ( feature =  "std" ))]# [ inline ] fn  guess ( x : $T )-> $T { 1 << (( log2 ( x )+  2 )/  3 )} let  next = |  x : $T | ( a / ( x *  x )+  x *  2 )/  3 ;  fixpoint ( guess ( a ),  next )} go (*  self )}}}; }
+macro_rules! __ra_macro_fixture210 {($T :  ty , $test_mod :  ident )=>{ impl  Integer  for $T {# [ doc =  " Floored integer division" ]# [ inline ] fn  div_floor (&  self ,  other : &  Self )->  Self { let ( d ,  r )=  self .  div_rem ( other );  if ( r >  0 && *  other <  0 )|| ( r <  0 && *  other >  0 ){ d -  1 } else { d }}# [ doc =  " Floored integer modulo" ]# [ inline ] fn  mod_floor (&  self ,  other : &  Self )->  Self { let  r = *  self % *  other ;  if ( r >  0 && *  other <  0 )|| ( r <  0 && *  other >  0 ){ r + *  other } else { r }}# [ doc =  " Calculates `div_floor` and `mod_floor` simultaneously" ]# [ inline ] fn  div_mod_floor (&  self ,  other : &  Self )-> ( Self ,  Self ){ let ( d ,  r )=  self .  div_rem ( other );  if ( r >  0 && *  other <  0 )|| ( r <  0 && *  other >  0 ){( d -  1 ,  r + *  other )} else {( d ,  r )}}# [ inline ] fn  div_ceil (&  self ,  other : &  Self )->  Self { let ( d ,  r )=  self .  div_rem ( other );  if ( r >  0 && *  other >  0 )|| ( r <  0 && *  other <  0 ){ d +  1 } else { d }}# [ doc =  " Calculates the Greatest Common Divisor (GCD) of the number and" ]# [ doc =  " `other`. The result is always positive." ]# [ inline ] fn  gcd (&  self ,  other : &  Self )->  Self { let  mut  m = *  self ;  let  mut  n = *  other ;  if  m ==  0 ||  n ==  0 { return ( m |  n ).  abs (); } let  shift = ( m |  n ).  trailing_zeros ();  if  m ==  Self ::  min_value ()||  n ==  Self ::  min_value (){ return ( 1 <<  shift ).  abs (); } m =  m .  abs ();  n =  n .  abs ();  m >>=  m .  trailing_zeros ();  n >>=  n .  trailing_zeros ();  while  m !=  n { if  m > n { m -=  n ;  m >>=  m .  trailing_zeros (); } else { n -=  m ;  n >>=  n .  trailing_zeros (); }} m <<  shift }# [ inline ] fn  extended_gcd_lcm (&  self ,  other : &  Self )-> ( ExtendedGcd <  Self >,  Self ){ let  egcd =  self .  extended_gcd ( other );  let  lcm =  if  egcd .  gcd .  is_zero (){ Self ::  zero ()} else {(*  self * (*  other /  egcd .  gcd )).  abs ()}; ( egcd ,  lcm )}# [ doc =  " Calculates the Lowest Common Multiple (LCM) of the number and" ]# [ doc =  " `other`." ]# [ inline ] fn  lcm (&  self ,  other : &  Self )->  Self { self .  gcd_lcm ( other ).  1 }# [ doc =  " Calculates the Greatest Common Divisor (GCD) and" ]# [ doc =  " Lowest Common Multiple (LCM) of the number and `other`." ]# [ inline ] fn  gcd_lcm (&  self ,  other : &  Self )-> ( Self ,  Self ){ if  self .  is_zero ()&&  other .  is_zero (){ return ( Self ::  zero (),  Self ::  zero ()); } let  gcd =  self .  gcd ( other );  let  lcm = (*  self * (*  other /  gcd )).  abs (); ( gcd ,  lcm )}# [ doc =  " Deprecated, use `is_multiple_of` instead." ]# [ inline ] fn  divides (&  self ,  other : &  Self )->  bool { self .  is_multiple_of ( other )}# [ doc =  " Returns `true` if the number is a multiple of `other`." ]# [ inline ] fn  is_multiple_of (&  self ,  other : &  Self )->  bool {*  self % *  other ==  0 }# [ doc =  " Returns `true` if the number is divisible by `2`" ]# [ inline ] fn  is_even (&  self )->  bool {(*  self )&  1 ==  0 }# [ doc =  " Returns `true` if the number is not divisible by `2`" ]# [ inline ] fn  is_odd (&  self )->  bool {!  self .  is_even ()}# [ doc =  " Simultaneous truncated integer division and modulus." ]# [ inline ] fn  div_rem (&  self ,  other : &  Self )-> ( Self ,  Self ){(*  self / *  other , *  self % *  other )}}# [ cfg ( test )] mod $test_mod { use  core ::  mem ;  use  Integer ; # [ doc =  " Checks that the division rule holds for:" ]# [ doc =  "" ]# [ doc =  " - `n`: numerator (dividend)" ]# [ doc =  " - `d`: denominator (divisor)" ]# [ doc =  " - `qr`: quotient and remainder" ]# [ cfg ( test )] fn  test_division_rule (( n ,  d ): ($T , $T ), ( q ,  r ): ($T , $T )){ assert_eq ! ( d *  q +  r ,  n ); }# [ test ] fn  test_div_rem (){ fn  test_nd_dr ( nd : ($T , $T ),  qr : ($T , $T )){ let ( n ,  d )=  nd ;  let  separate_div_rem = ( n /  d ,  n %  d );  let  combined_div_rem =  n .  div_rem (&  d );  assert_eq ! ( separate_div_rem ,  qr );  assert_eq ! ( combined_div_rem ,  qr );  test_division_rule ( nd ,  separate_div_rem );  test_division_rule ( nd ,  combined_div_rem ); } test_nd_dr (( 8 ,  3 ), ( 2 ,  2 ));  test_nd_dr (( 8 , -  3 ), (-  2 ,  2 ));  test_nd_dr ((-  8 ,  3 ), (-  2 , -  2 ));  test_nd_dr ((-  8 , -  3 ), ( 2 , -  2 ));  test_nd_dr (( 1 ,  2 ), ( 0 ,  1 ));  test_nd_dr (( 1 , -  2 ), ( 0 ,  1 ));  test_nd_dr ((-  1 ,  2 ), ( 0 , -  1 ));  test_nd_dr ((-  1 , -  2 ), ( 0 , -  1 )); }# [ test ] fn  test_div_mod_floor (){ fn  test_nd_dm ( nd : ($T , $T ),  dm : ($T , $T )){ let ( n ,  d )=  nd ;  let  separate_div_mod_floor = ( n .  div_floor (&  d ),  n .  mod_floor (&  d ));  let  combined_div_mod_floor =  n .  div_mod_floor (&  d );  assert_eq ! ( separate_div_mod_floor ,  dm );  assert_eq ! ( combined_div_mod_floor ,  dm );  test_division_rule ( nd ,  separate_div_mod_floor );  test_division_rule ( nd ,  combined_div_mod_floor ); } test_nd_dm (( 8 ,  3 ), ( 2 ,  2 ));  test_nd_dm (( 8 , -  3 ), (-  3 , -  1 ));  test_nd_dm ((-  8 ,  3 ), (-  3 ,  1 ));  test_nd_dm ((-  8 , -  3 ), ( 2 , -  2 ));  test_nd_dm (( 1 ,  2 ), ( 0 ,  1 ));  test_nd_dm (( 1 , -  2 ), (-  1 , -  1 ));  test_nd_dm ((-  1 ,  2 ), (-  1 ,  1 ));  test_nd_dm ((-  1 , -  2 ), ( 0 , -  1 )); }# [ test ] fn  test_gcd (){ assert_eq ! (( 10  as $T ).  gcd (&  2 ),  2  as $T );  assert_eq ! (( 10  as $T ).  gcd (&  3 ),  1  as $T );  assert_eq ! (( 0  as $T ).  gcd (&  3 ),  3  as $T );  assert_eq ! (( 3  as $T ).  gcd (&  3 ),  3  as $T );  assert_eq ! (( 56  as $T ).  gcd (&  42 ),  14  as $T );  assert_eq ! (( 3  as $T ).  gcd (&-  3 ),  3  as $T );  assert_eq ! ((-  6  as $T ).  gcd (&  3 ),  3  as $T );  assert_eq ! ((-  4  as $T ).  gcd (&-  2 ),  2  as $T ); }# [ test ] fn  test_gcd_cmp_with_euclidean (){ fn  euclidean_gcd ( mut  m : $T ,  mut  n : $T )-> $T { while  m !=  0 { mem ::  swap (&  mut  m , &  mut  n );  m %=  n ; } n .  abs ()} for  i  in -  127 ..  127 { for  j  in -  127 ..  127 { assert_eq ! ( euclidean_gcd ( i ,  j ),  i .  gcd (&  j )); }} let  i =  127 ;  for  j  in -  127 ..  127 { assert_eq ! ( euclidean_gcd ( i ,  j ),  i .  gcd (&  j )); } assert_eq ! ( 127 .  gcd (&  127 ),  127 ); }# [ test ] fn  test_gcd_min_val (){ let  min = <$T >::  min_value ();  let  max = <$T >::  max_value ();  let  max_pow2 =  max /  2 +  1 ;  assert_eq ! ( min .  gcd (&  max ),  1  as $T );  assert_eq ! ( max .  gcd (&  min ),  1  as $T );  assert_eq ! ( min .  gcd (&  max_pow2 ),  max_pow2 );  assert_eq ! ( max_pow2 .  gcd (&  min ),  max_pow2 );  assert_eq ! ( min .  gcd (&  42 ),  2  as $T );  assert_eq ! (( 42  as $T ).  gcd (&  min ),  2  as $T ); }# [ test ]# [ should_panic ] fn  test_gcd_min_val_min_val (){ let  min = <$T >::  min_value ();  assert ! ( min .  gcd (&  min )>=  0 ); }# [ test ]# [ should_panic ] fn  test_gcd_min_val_0 (){ let  min = <$T >::  min_value ();  assert ! ( min .  gcd (&  0 )>=  0 ); }# [ test ]# [ should_panic ] fn  test_gcd_0_min_val (){ let  min = <$T >::  min_value ();  assert ! (( 0  as $T ).  gcd (&  min )>=  0 ); }# [ test ] fn  test_lcm (){ assert_eq ! (( 1  as $T ).  lcm (&  0 ),  0  as $T );  assert_eq ! (( 0  as $T ).  lcm (&  1 ),  0  as $T );  assert_eq ! (( 1  as $T ).  lcm (&  1 ),  1  as $T );  assert_eq ! ((-  1  as $T ).  lcm (&  1 ),  1  as $T );  assert_eq ! (( 1  as $T ).  lcm (&-  1 ),  1  as $T );  assert_eq ! ((-  1  as $T ).  lcm (&-  1 ),  1  as $T );  assert_eq ! (( 8  as $T ).  lcm (&  9 ),  72  as $T );  assert_eq ! (( 11  as $T ).  lcm (&  5 ),  55  as $T ); }# [ test ] fn  test_gcd_lcm (){ use  core ::  iter ::  once ;  for  i  in  once ( 0 ).  chain (( 1 ..).  take ( 127 ).  flat_map (|  a |  once ( a ).  chain ( once (-  a )))).  chain ( once (-  128 )){ for  j  in  once ( 0 ).  chain (( 1 ..).  take ( 127 ).  flat_map (|  a |  once ( a ).  chain ( once (-  a )))).  chain ( once (-  128 )){ assert_eq ! ( i .  gcd_lcm (&  j ), ( i .  gcd (&  j ),  i .  lcm (&  j ))); }}}# [ test ] fn  test_extended_gcd_lcm (){ use  core ::  fmt ::  Debug ;  use  traits ::  NumAssign ;  use  ExtendedGcd ;  fn  check <  A :  Copy +  Debug +  Integer +  NumAssign > ( a :  A ,  b :  A ){ let  ExtendedGcd { gcd ,  x ,  y , .. }=  a .  extended_gcd (&  b );  assert_eq ! ( gcd ,  x *  a +  y *  b ); } use  core ::  iter ::  once ;  for  i  in  once ( 0 ).  chain (( 1 ..).  take ( 127 ).  flat_map (|  a |  once ( a ).  chain ( once (-  a )))).  chain ( once (-  128 )){ for  j  in  once ( 0 ).  chain (( 1 ..).  take ( 127 ).  flat_map (|  a |  once ( a ).  chain ( once (-  a )))).  chain ( once (-  128 )){ check ( i ,  j );  let ( ExtendedGcd { gcd , .. },  lcm )=  i .  extended_gcd_lcm (&  j );  assert_eq ! (( gcd ,  lcm ), ( i .  gcd (&  j ),  i .  lcm (&  j ))); }}}# [ test ] fn  test_even (){ assert_eq ! ((-  4  as $T ).  is_even (),  true );  assert_eq ! ((-  3  as $T ).  is_even (),  false );  assert_eq ! ((-  2  as $T ).  is_even (),  true );  assert_eq ! ((-  1  as $T ).  is_even (),  false );  assert_eq ! (( 0  as $T ).  is_even (),  true );  assert_eq ! (( 1  as $T ).  is_even (),  false );  assert_eq ! (( 2  as $T ).  is_even (),  true );  assert_eq ! (( 3  as $T ).  is_even (),  false );  assert_eq ! (( 4  as $T ).  is_even (),  true ); }# [ test ] fn  test_odd (){ assert_eq ! ((-  4  as $T ).  is_odd (),  false );  assert_eq ! ((-  3  as $T ).  is_odd (),  true );  assert_eq ! ((-  2  as $T ).  is_odd (),  false );  assert_eq ! ((-  1  as $T ).  is_odd (),  true );  assert_eq ! (( 0  as $T ).  is_odd (),  false );  assert_eq ! (( 1  as $T ).  is_odd (),  true );  assert_eq ! (( 2  as $T ).  is_odd (),  false );  assert_eq ! (( 3  as $T ).  is_odd (),  true );  assert_eq ! (( 4  as $T ).  is_odd (),  false ); }}}; }
+macro_rules! __ra_macro_fixture211 {($T :  ty , $test_mod :  ident )=>{ impl  Integer  for $T {# [ doc =  " Unsigned integer division. Returns the same result as `div` (`/`)." ]# [ inline ] fn  div_floor (&  self ,  other : &  Self )->  Self {*  self / *  other }# [ doc =  " Unsigned integer modulo operation. Returns the same result as `rem` (`%`)." ]# [ inline ] fn  mod_floor (&  self ,  other : &  Self )->  Self {*  self % *  other }# [ inline ] fn  div_ceil (&  self ,  other : &  Self )->  Self {*  self / *  other + ( 0 != *  self % *  other ) as  Self }# [ doc =  " Calculates the Greatest Common Divisor (GCD) of the number and `other`" ]# [ inline ] fn  gcd (&  self ,  other : &  Self )->  Self { let  mut  m = *  self ;  let  mut  n = *  other ;  if  m ==  0 ||  n ==  0 { return  m |  n ; } let  shift = ( m |  n ).  trailing_zeros ();  m >>=  m .  trailing_zeros ();  n >>=  n .  trailing_zeros ();  while  m !=  n { if  m > n { m -=  n ;  m >>=  m .  trailing_zeros (); } else { n -=  m ;  n >>=  n .  trailing_zeros (); }} m <<  shift }# [ inline ] fn  extended_gcd_lcm (&  self ,  other : &  Self )-> ( ExtendedGcd <  Self >,  Self ){ let  egcd =  self .  extended_gcd ( other );  let  lcm =  if  egcd .  gcd .  is_zero (){ Self ::  zero ()} else {*  self * (*  other /  egcd .  gcd )}; ( egcd ,  lcm )}# [ doc =  " Calculates the Lowest Common Multiple (LCM) of the number and `other`." ]# [ inline ] fn  lcm (&  self ,  other : &  Self )->  Self { self .  gcd_lcm ( other ).  1 }# [ doc =  " Calculates the Greatest Common Divisor (GCD) and" ]# [ doc =  " Lowest Common Multiple (LCM) of the number and `other`." ]# [ inline ] fn  gcd_lcm (&  self ,  other : &  Self )-> ( Self ,  Self ){ if  self .  is_zero ()&&  other .  is_zero (){ return ( Self ::  zero (),  Self ::  zero ()); } let  gcd =  self .  gcd ( other );  let  lcm = *  self * (*  other /  gcd ); ( gcd ,  lcm )}# [ doc =  " Deprecated, use `is_multiple_of` instead." ]# [ inline ] fn  divides (&  self ,  other : &  Self )->  bool { self .  is_multiple_of ( other )}# [ doc =  " Returns `true` if the number is a multiple of `other`." ]# [ inline ] fn  is_multiple_of (&  self ,  other : &  Self )->  bool {*  self % *  other ==  0 }# [ doc =  " Returns `true` if the number is divisible by `2`." ]# [ inline ] fn  is_even (&  self )->  bool {*  self %  2 ==  0 }# [ doc =  " Returns `true` if the number is not divisible by `2`." ]# [ inline ] fn  is_odd (&  self )->  bool {!  self .  is_even ()}# [ doc =  " Simultaneous truncated integer division and modulus." ]# [ inline ] fn  div_rem (&  self ,  other : &  Self )-> ( Self ,  Self ){(*  self / *  other , *  self % *  other )}}# [ cfg ( test )] mod $test_mod { use  core ::  mem ;  use  Integer ; # [ test ] fn  test_div_mod_floor (){ assert_eq ! (( 10  as $T ).  div_floor (& ( 3  as $T )),  3  as $T );  assert_eq ! (( 10  as $T ).  mod_floor (& ( 3  as $T )),  1  as $T );  assert_eq ! (( 10  as $T ).  div_mod_floor (& ( 3  as $T )), ( 3  as $T ,  1  as $T ));  assert_eq ! (( 5  as $T ).  div_floor (& ( 5  as $T )),  1  as $T );  assert_eq ! (( 5  as $T ).  mod_floor (& ( 5  as $T )),  0  as $T );  assert_eq ! (( 5  as $T ).  div_mod_floor (& ( 5  as $T )), ( 1  as $T ,  0  as $T ));  assert_eq ! (( 3  as $T ).  div_floor (& ( 7  as $T )),  0  as $T );  assert_eq ! (( 3  as $T ).  mod_floor (& ( 7  as $T )),  3  as $T );  assert_eq ! (( 3  as $T ).  div_mod_floor (& ( 7  as $T )), ( 0  as $T ,  3  as $T )); }# [ test ] fn  test_gcd (){ assert_eq ! (( 10  as $T ).  gcd (&  2 ),  2  as $T );  assert_eq ! (( 10  as $T ).  gcd (&  3 ),  1  as $T );  assert_eq ! (( 0  as $T ).  gcd (&  3 ),  3  as $T );  assert_eq ! (( 3  as $T ).  gcd (&  3 ),  3  as $T );  assert_eq ! (( 56  as $T ).  gcd (&  42 ),  14  as $T ); }# [ test ] fn  test_gcd_cmp_with_euclidean (){ fn  euclidean_gcd ( mut  m : $T ,  mut  n : $T )-> $T { while  m !=  0 { mem ::  swap (&  mut  m , &  mut  n );  m %=  n ; } n } for  i  in  0 ..  255 { for  j  in  0 ..  255 { assert_eq ! ( euclidean_gcd ( i ,  j ),  i .  gcd (&  j )); }} let  i =  255 ;  for  j  in  0 ..  255 { assert_eq ! ( euclidean_gcd ( i ,  j ),  i .  gcd (&  j )); } assert_eq ! ( 255 .  gcd (&  255 ),  255 ); }# [ test ] fn  test_lcm (){ assert_eq ! (( 1  as $T ).  lcm (&  0 ),  0  as $T );  assert_eq ! (( 0  as $T ).  lcm (&  1 ),  0  as $T );  assert_eq ! (( 1  as $T ).  lcm (&  1 ),  1  as $T );  assert_eq ! (( 8  as $T ).  lcm (&  9 ),  72  as $T );  assert_eq ! (( 11  as $T ).  lcm (&  5 ),  55  as $T );  assert_eq ! (( 15  as $T ).  lcm (&  17 ),  255  as $T ); }# [ test ] fn  test_gcd_lcm (){ for  i  in ( 0 ..).  take ( 256 ){ for  j  in ( 0 ..).  take ( 256 ){ assert_eq ! ( i .  gcd_lcm (&  j ), ( i .  gcd (&  j ),  i .  lcm (&  j ))); }}}# [ test ] fn  test_is_multiple_of (){ assert ! (( 6  as $T ).  is_multiple_of (& ( 6  as $T )));  assert ! (( 6  as $T ).  is_multiple_of (& ( 3  as $T )));  assert ! (( 6  as $T ).  is_multiple_of (& ( 1  as $T ))); }# [ test ] fn  test_even (){ assert_eq ! (( 0  as $T ).  is_even (),  true );  assert_eq ! (( 1  as $T ).  is_even (),  false );  assert_eq ! (( 2  as $T ).  is_even (),  true );  assert_eq ! (( 3  as $T ).  is_even (),  false );  assert_eq ! (( 4  as $T ).  is_even (),  true ); }# [ test ] fn  test_odd (){ assert_eq ! (( 0  as $T ).  is_odd (),  false );  assert_eq ! (( 1  as $T ).  is_odd (),  true );  assert_eq ! (( 2  as $T ).  is_odd (),  false );  assert_eq ! (( 3  as $T ).  is_odd (),  true );  assert_eq ! (( 4  as $T ).  is_odd (),  false ); }}}; }
+macro_rules! __ra_macro_fixture212 {($I :  ident , $U :  ident )=>{ mod $I { use  check ;  use  neg ;  use  num_integer ::  Roots ;  use  pos ;  use  std ::  mem ; # [ test ]# [ should_panic ] fn  zeroth_root (){( 123  as $I ).  nth_root ( 0 ); }# [ test ] fn  sqrt (){ check (&  pos ::<$I > (),  2 ); }# [ test ]# [ should_panic ] fn  sqrt_neg (){(-  123  as $I ).  sqrt (); }# [ test ] fn  cbrt (){ check (&  pos ::<$I > (),  3 ); }# [ test ] fn  cbrt_neg (){ check (&  neg ::<$I > (),  3 ); }# [ test ] fn  nth_root (){ let  bits =  8 *  mem ::  size_of ::<$I > () as  u32 -  1 ;  let  pos =  pos ::<$I > ();  for  n  in  4 ..  bits { check (&  pos ,  n ); }}# [ test ] fn  nth_root_neg (){ let  bits =  8 *  mem ::  size_of ::<$I > () as  u32 -  1 ;  let  neg =  neg ::<$I > ();  for  n  in  2 ..  bits /  2 { check (&  neg ,  2 *  n +  1 ); }}# [ test ] fn  bit_size (){ let  bits =  8 *  mem ::  size_of ::<$I > () as  u32 -  1 ;  assert_eq ! ($I ::  max_value ().  nth_root ( bits -  1 ),  2 );  assert_eq ! ($I ::  max_value ().  nth_root ( bits ),  1 );  assert_eq ! ($I ::  min_value ().  nth_root ( bits ), -  2 );  assert_eq ! (($I ::  min_value ()+  1 ).  nth_root ( bits ), -  1 ); }} mod $U { use  check ;  use  num_integer ::  Roots ;  use  pos ;  use  std ::  mem ; # [ test ]# [ should_panic ] fn  zeroth_root (){( 123  as $U ).  nth_root ( 0 ); }# [ test ] fn  sqrt (){ check (&  pos ::<$U > (),  2 ); }# [ test ] fn  cbrt (){ check (&  pos ::<$U > (),  3 ); }# [ test ] fn  nth_root (){ let  bits =  8 *  mem ::  size_of ::<$I > () as  u32 -  1 ;  let  pos =  pos ::<$I > ();  for  n  in  4 ..  bits { check (&  pos ,  n ); }}# [ test ] fn  bit_size (){ let  bits =  8 *  mem ::  size_of ::<$U > () as  u32 ;  assert_eq ! ($U ::  max_value ().  nth_root ( bits -  1 ),  2 );  assert_eq ! ($U ::  max_value ().  nth_root ( bits ),  1 ); }}}; }
+macro_rules! __ra_macro_fixture213 {($name :  ident , $ranges :  ident )=>{# [ test ] fn $name (){ let  set =  ranges_to_set ( general_category ::$ranges );  let  hashset :  HashSet <  u32 > =  set .  iter ().  cloned ().  collect ();  let  trie =  TrieSetOwned ::  from_codepoints (&  set ).  unwrap ();  for  cp  in  0 ..  0x110000 { assert ! ( trie .  contains_u32 ( cp )==  hashset .  contains (&  cp )); } assert ! (!  trie .  contains_u32 ( 0x110000 ));  assert ! (!  hashset .  contains (&  0x110000 )); }}; }
+macro_rules! __ra_macro_fixture214 {{$(mod $module :  ident ; [$($prop :  ident , )*]; )*}=>{$(# [ allow ( unused )] mod $module ; $(pub  fn $prop ( c :  char )->  bool { self ::$module ::$prop .  contains_char ( c )})* )*}; }
+macro_rules! __ra_macro_fixture215 {($name :  ident : $input :  expr , $($x :  tt )* )=>{# [ test ] fn $name (){ let  expected_sets =  vec ! [$($x )*];  let  range_set :  RangeSet = $input .  parse ().  expect ( "parse failed" );  assert_eq ! ( range_set .  ranges .  len (),  expected_sets .  len ());  for  it  in  range_set .  ranges .  iter ().  zip ( expected_sets .  iter ()){ let ( ai ,  bi )=  it ;  assert_eq ! ( ai .  comparator_set .  len (), *  bi ); }}}; }
+macro_rules! __ra_macro_fixture216 {($name :  ident : $input :  expr , $($x :  tt )* )=>{# [ test ] fn $name (){ let  expected_sets =  vec ! [$($x )*];  let  range_set =  RangeSet ::  parse ($input ,  Compat ::  Npm ).  expect ( "parse failed" );  assert_eq ! ( range_set .  ranges .  len (),  expected_sets .  len ());  for  it  in  range_set .  ranges .  iter ().  zip ( expected_sets .  iter ()){ let ( ai ,  bi )=  it ;  assert_eq ! ( ai .  comparator_set .  len (), *  bi ); }}}; }
+macro_rules! __ra_macro_fixture217 {($($name :  ident : $value :  expr , )* )=>{$(# [ test ] fn $name (){ assert ! ($value .  parse ::<  RangeSet > ().  is_err ()); })* }; }
+macro_rules! __ra_macro_fixture218 {($($name :  ident : $value :  expr , )* )=>{$(# [ test ] fn $name (){ let ( input ,  expected_range )= $value ;  let  parsed_range =  parse_range ( input );  let  range =  from_pair_iterator ( parsed_range ,  range_set ::  Compat ::  Cargo ).  expect ( "parsing failed" );  let  num_comparators =  range .  comparator_set .  len ();  let  expected_comparators =  expected_range .  comparator_set .  len ();  assert_eq ! ( expected_comparators ,  num_comparators ,  "expected number of comparators: {}, got: {}" ,  expected_comparators ,  num_comparators );  assert_eq ! ( range ,  expected_range ); })* }; }
+macro_rules! __ra_macro_fixture219 {($($name :  ident : $value :  expr , )* )=>{$(# [ test ] fn $name (){ let ( input ,  expected_range )= $value ;  let  parsed_range =  parse_range ( input );  let  range =  from_pair_iterator ( parsed_range ,  range_set ::  Compat ::  Npm ).  expect ( "parsing failed" );  let  num_comparators =  range .  comparator_set .  len ();  let  expected_comparators =  expected_range .  comparator_set .  len ();  assert_eq ! ( expected_comparators ,  num_comparators ,  "expected number of comparators: {}, got: {}" ,  expected_comparators ,  num_comparators );  assert_eq ! ( range ,  expected_range ); })* }; }
+macro_rules! __ra_macro_fixture220 {($ty :  ident $(<$lifetime :  tt >)*)=>{ impl <$($lifetime ,)*  E >  Copy  for $ty <$($lifetime ,)*  E > {} impl <$($lifetime ,)*  E >  Clone  for $ty <$($lifetime ,)*  E > { fn  clone (&  self )->  Self {*  self }}}; }
+macro_rules! __ra_macro_fixture221 {($ty :  ty , $doc :  tt , $name :  ident , $method :  ident $($cast :  tt )*)=>{# [ doc =  "A deserializer holding" ]# [ doc = $doc ] pub  struct $name <  E > { value : $ty ,  marker :  PhantomData <  E > } impl_copy_clone ! ($name );  impl < 'de ,  E >  IntoDeserializer < 'de ,  E >  for $ty  where  E :  de ::  Error , { type  Deserializer = $name <  E >;  fn  into_deserializer ( self )-> $name <  E > {$name { value :  self ,  marker :  PhantomData , }}} impl < 'de ,  E >  de ::  Deserializer < 'de >  for $name <  E >  where  E :  de ::  Error , { type  Error =  E ;  forward_to_deserialize_any ! { bool  i8  i16  i32  i64  i128  u8  u16  u32  u64  u128  f32  f64  char  str  string  bytes  byte_buf  option  unit  unit_struct  newtype_struct  seq  tuple  tuple_struct  map  struct  enum  identifier  ignored_any } fn  deserialize_any <  V > ( self ,  visitor :  V )->  Result <  V ::  Value ,  Self ::  Error >  where  V :  de ::  Visitor < 'de >, { visitor .$method ( self .  value $($cast )*)}} impl <  E >  Debug  for $name <  E > { fn  fmt (&  self ,  formatter : &  mut  fmt ::  Formatter )->  fmt ::  Result { formatter .  debug_struct ( stringify ! ($name )).  field ( "value" , &  self .  value ).  finish ()}}}}
+macro_rules! __ra_macro_fixture222 {($($tt :  tt )*)=>{}; }
+macro_rules! __ra_macro_fixture223 {($ty :  ident , $deserialize :  ident $($methods :  tt )*)=>{ impl < 'de >  Deserialize < 'de >  for $ty {# [ inline ] fn  deserialize <  D > ( deserializer :  D )->  Result <  Self ,  D ::  Error >  where  D :  Deserializer < 'de >, { struct  PrimitiveVisitor ;  impl < 'de >  Visitor < 'de >  for  PrimitiveVisitor { type  Value = $ty ;  fn  expecting (&  self ,  formatter : &  mut  fmt ::  Formatter )->  fmt ::  Result { formatter .  write_str ( stringify ! ($ty ))}$($methods )* } deserializer .$deserialize ( PrimitiveVisitor )}}}; }
+macro_rules! __ra_macro_fixture224 {($ty :  ident <  T $(: $tbound1 :  ident $(+ $tbound2 :  ident )*)* $(, $typaram :  ident : $bound1 :  ident $(+ $bound2 :  ident )*)* >, $access :  ident , $clear :  expr , $with_capacity :  expr , $reserve :  expr , $insert :  expr )=>{ impl < 'de ,  T $(, $typaram )*>  Deserialize < 'de >  for $ty <  T $(, $typaram )*>  where  T :  Deserialize < 'de > $(+ $tbound1 $(+ $tbound2 )*)*, $($typaram : $bound1 $(+ $bound2 )*,)* { fn  deserialize <  D > ( deserializer :  D )->  Result <  Self ,  D ::  Error >  where  D :  Deserializer < 'de >, { struct  SeqVisitor <  T $(, $typaram )*> { marker :  PhantomData <$ty <  T $(, $typaram )*>>, } impl < 'de ,  T $(, $typaram )*>  Visitor < 'de >  for  SeqVisitor <  T $(, $typaram )*>  where  T :  Deserialize < 'de > $(+ $tbound1 $(+ $tbound2 )*)*, $($typaram : $bound1 $(+ $bound2 )*,)* { type  Value = $ty <  T $(, $typaram )*>;  fn  expecting (&  self ,  formatter : &  mut  fmt ::  Formatter )->  fmt ::  Result { formatter .  write_str ( "a sequence" )}# [ inline ] fn  visit_seq <  A > ( self ,  mut $access :  A )->  Result <  Self ::  Value ,  A ::  Error >  where  A :  SeqAccess < 'de >, { let  mut  values = $with_capacity ;  while  let  Some ( value )=  try ! ($access .  next_element ()){$insert (&  mut  values ,  value ); } Ok ( values )}} let  visitor =  SeqVisitor { marker :  PhantomData };  deserializer .  deserialize_seq ( visitor )} fn  deserialize_in_place <  D > ( deserializer :  D ,  place : &  mut  Self )->  Result < (),  D ::  Error >  where  D :  Deserializer < 'de >, { struct  SeqInPlaceVisitor < 'a ,  T : 'a $(, $typaram : 'a )*> (& 'a  mut $ty <  T $(, $typaram )*>);  impl < 'a , 'de ,  T $(, $typaram )*>  Visitor < 'de >  for  SeqInPlaceVisitor < 'a ,  T $(, $typaram )*>  where  T :  Deserialize < 'de > $(+ $tbound1 $(+ $tbound2 )*)*, $($typaram : $bound1 $(+ $bound2 )*,)* { type  Value = ();  fn  expecting (&  self ,  formatter : &  mut  fmt ::  Formatter )->  fmt ::  Result { formatter .  write_str ( "a sequence" )}# [ inline ] fn  visit_seq <  A > ( mut  self ,  mut $access :  A )->  Result <  Self ::  Value ,  A ::  Error >  where  A :  SeqAccess < 'de >, {$clear (&  mut  self .  0 ); $reserve (&  mut  self .  0 ,  size_hint ::  cautious ($access .  size_hint ()));  while  let  Some ( value )=  try ! ($access .  next_element ()){$insert (&  mut  self .  0 ,  value ); } Ok (())}} deserializer .  deserialize_seq ( SeqInPlaceVisitor ( place ))}}}}
+macro_rules! __ra_macro_fixture225 {($($len :  expr =>($($n :  tt )+))+)=>{$(impl < 'de ,  T >  Visitor < 'de >  for  ArrayVisitor < [ T ; $len ]>  where  T :  Deserialize < 'de >, { type  Value = [ T ; $len ];  fn  expecting (&  self ,  formatter : &  mut  fmt ::  Formatter )->  fmt ::  Result { formatter .  write_str ( concat ! ( "an array of length " , $len ))}# [ inline ] fn  visit_seq <  A > ( self ,  mut  seq :  A )->  Result <  Self ::  Value ,  A ::  Error >  where  A :  SeqAccess < 'de >, { Ok ([$(match  try ! ( seq .  next_element ()){ Some ( val )=> val ,  None => return  Err ( Error ::  invalid_length ($n , &  self )), }),+])}} impl < 'a , 'de ,  T >  Visitor < 'de >  for  ArrayInPlaceVisitor < 'a , [ T ; $len ]>  where  T :  Deserialize < 'de >, { type  Value = ();  fn  expecting (&  self ,  formatter : &  mut  fmt ::  Formatter )->  fmt ::  Result { formatter .  write_str ( concat ! ( "an array of length " , $len ))}# [ inline ] fn  visit_seq <  A > ( self ,  mut  seq :  A )->  Result <  Self ::  Value ,  A ::  Error >  where  A :  SeqAccess < 'de >, { let  mut  fail_idx =  None ;  for ( idx ,  dest ) in  self .  0 [..].  iter_mut ().  enumerate (){ if  try ! ( seq .  next_element_seed ( InPlaceSeed ( dest ))).  is_none (){ fail_idx =  Some ( idx );  break ; }} if  let  Some ( idx )=  fail_idx { return  Err ( Error ::  invalid_length ( idx , &  self )); } Ok (())}} impl < 'de ,  T >  Deserialize < 'de >  for [ T ; $len ] where  T :  Deserialize < 'de >, { fn  deserialize <  D > ( deserializer :  D )->  Result <  Self ,  D ::  Error >  where  D :  Deserializer < 'de >, { deserializer .  deserialize_tuple ($len ,  ArrayVisitor ::< [ T ; $len ]>::  new ())} fn  deserialize_in_place <  D > ( deserializer :  D ,  place : &  mut  Self )->  Result < (),  D ::  Error >  where  D :  Deserializer < 'de >, { deserializer .  deserialize_tuple ($len ,  ArrayInPlaceVisitor ( place ))}})+ }}
+macro_rules! __ra_macro_fixture226 {($($len :  tt =>($($n :  tt $name :  ident )+))+)=>{$(impl < 'de , $($name :  Deserialize < 'de >),+>  Deserialize < 'de >  for ($($name ,)+){# [ inline ] fn  deserialize <  D > ( deserializer :  D )->  Result <  Self ,  D ::  Error >  where  D :  Deserializer < 'de >, { struct  TupleVisitor <$($name ,)+> { marker :  PhantomData < ($($name ,)+)>, } impl < 'de , $($name :  Deserialize < 'de >),+>  Visitor < 'de >  for  TupleVisitor <$($name ,)+> { type  Value = ($($name ,)+);  fn  expecting (&  self ,  formatter : &  mut  fmt ::  Formatter )->  fmt ::  Result { formatter .  write_str ( concat ! ( "a tuple of size " , $len ))}# [ inline ]# [ allow ( non_snake_case )] fn  visit_seq <  A > ( self ,  mut  seq :  A )->  Result <  Self ::  Value ,  A ::  Error >  where  A :  SeqAccess < 'de >, {$(let $name =  match  try ! ( seq .  next_element ()){ Some ( value )=> value ,  None => return  Err ( Error ::  invalid_length ($n , &  self )), }; )+  Ok (($($name ,)+))}} deserializer .  deserialize_tuple ($len ,  TupleVisitor { marker :  PhantomData })}# [ inline ] fn  deserialize_in_place <  D > ( deserializer :  D ,  place : &  mut  Self )->  Result < (),  D ::  Error >  where  D :  Deserializer < 'de >, { struct  TupleInPlaceVisitor < 'a , $($name : 'a ,)+> (& 'a  mut ($($name ,)+));  impl < 'a , 'de , $($name :  Deserialize < 'de >),+>  Visitor < 'de >  for  TupleInPlaceVisitor < 'a , $($name ,)+> { type  Value = ();  fn  expecting (&  self ,  formatter : &  mut  fmt ::  Formatter )->  fmt ::  Result { formatter .  write_str ( concat ! ( "a tuple of size " , $len ))}# [ inline ]# [ allow ( non_snake_case )] fn  visit_seq <  A > ( self ,  mut  seq :  A )->  Result <  Self ::  Value ,  A ::  Error >  where  A :  SeqAccess < 'de >, {$(if  try ! ( seq .  next_element_seed ( InPlaceSeed (&  mut ( self .  0 ).$n ))).  is_none (){ return  Err ( Error ::  invalid_length ($n , &  self )); })+  Ok (())}} deserializer .  deserialize_tuple ($len ,  TupleInPlaceVisitor ( place ))}})+ }}
+macro_rules! __ra_macro_fixture227 {($ty :  ident <  K $(: $kbound1 :  ident $(+ $kbound2 :  ident )*)*,  V $(, $typaram :  ident : $bound1 :  ident $(+ $bound2 :  ident )*)* >, $access :  ident , $with_capacity :  expr )=>{ impl < 'de ,  K ,  V $(, $typaram )*>  Deserialize < 'de >  for $ty <  K ,  V $(, $typaram )*>  where  K :  Deserialize < 'de > $(+ $kbound1 $(+ $kbound2 )*)*,  V :  Deserialize < 'de >, $($typaram : $bound1 $(+ $bound2 )*),* { fn  deserialize <  D > ( deserializer :  D )->  Result <  Self ,  D ::  Error >  where  D :  Deserializer < 'de >, { struct  MapVisitor <  K ,  V $(, $typaram )*> { marker :  PhantomData <$ty <  K ,  V $(, $typaram )*>>, } impl < 'de ,  K ,  V $(, $typaram )*>  Visitor < 'de >  for  MapVisitor <  K ,  V $(, $typaram )*>  where  K :  Deserialize < 'de > $(+ $kbound1 $(+ $kbound2 )*)*,  V :  Deserialize < 'de >, $($typaram : $bound1 $(+ $bound2 )*),* { type  Value = $ty <  K ,  V $(, $typaram )*>;  fn  expecting (&  self ,  formatter : &  mut  fmt ::  Formatter )->  fmt ::  Result { formatter .  write_str ( "a map" )}# [ inline ] fn  visit_map <  A > ( self ,  mut $access :  A )->  Result <  Self ::  Value ,  A ::  Error >  where  A :  MapAccess < 'de >, { let  mut  values = $with_capacity ;  while  let  Some (( key ,  value ))=  try ! ($access .  next_entry ()){ values .  insert ( key ,  value ); } Ok ( values )}} let  visitor =  MapVisitor { marker :  PhantomData };  deserializer .  deserialize_map ( visitor )}}}}
+macro_rules! __ra_macro_fixture228 {($expecting :  tt $ty :  ty ; $size :  tt )=>{ impl < 'de >  Deserialize < 'de >  for $ty { fn  deserialize <  D > ( deserializer :  D )->  Result <  Self ,  D ::  Error >  where  D :  Deserializer < 'de >, { if  deserializer .  is_human_readable (){ deserializer .  deserialize_str ( FromStrVisitor ::  new ($expecting ))} else {< [ u8 ; $size ]>::  deserialize ( deserializer ).  map (<$ty >::  from )}}}}; }
+macro_rules! __ra_macro_fixture229 {($expecting :  tt $ty :  ty , $new :  expr )=>{ impl < 'de >  Deserialize < 'de >  for $ty { fn  deserialize <  D > ( deserializer :  D )->  Result <  Self ,  D ::  Error >  where  D :  Deserializer < 'de >, { if  deserializer .  is_human_readable (){ deserializer .  deserialize_str ( FromStrVisitor ::  new ($expecting ))} else {< (_,  u16 )>::  deserialize ( deserializer ).  map (| ( ip ,  port )| $new ( ip ,  port ))}}}}; }
+macro_rules! __ra_macro_fixture230 {($name_kind :  ident ($($variant :  ident ; $bytes :  expr ; $index :  expr ),* )$expecting_message :  expr , $variants_name :  ident )=>{ enum $name_kind {$($variant ),* } static $variants_name : & 'static [& 'static  str ]= & [$(stringify ! ($variant )),*];  impl < 'de >  Deserialize < 'de >  for $name_kind { fn  deserialize <  D > ( deserializer :  D )->  Result <  Self ,  D ::  Error >  where  D :  Deserializer < 'de >, { struct  KindVisitor ;  impl < 'de >  Visitor < 'de >  for  KindVisitor { type  Value = $name_kind ;  fn  expecting (&  self ,  formatter : &  mut  fmt ::  Formatter )->  fmt ::  Result { formatter .  write_str ($expecting_message )} fn  visit_u64 <  E > ( self ,  value :  u64 )->  Result <  Self ::  Value ,  E >  where  E :  Error , { match  value {$($index => Ok ($name_kind :: $variant ), )* _ => Err ( Error ::  invalid_value ( Unexpected ::  Unsigned ( value ), &  self ),), }} fn  visit_str <  E > ( self ,  value : &  str )->  Result <  Self ::  Value ,  E >  where  E :  Error , { match  value {$(stringify ! ($variant )=> Ok ($name_kind :: $variant ), )* _ => Err ( Error ::  unknown_variant ( value , $variants_name )), }} fn  visit_bytes <  E > ( self ,  value : & [ u8 ])->  Result <  Self ::  Value ,  E >  where  E :  Error , { match  value {$($bytes => Ok ($name_kind :: $variant ), )* _ =>{ match  str ::  from_utf8 ( value ){ Ok ( value )=> Err ( Error ::  unknown_variant ( value , $variants_name )),  Err (_)=> Err ( Error ::  invalid_value ( Unexpected ::  Bytes ( value ), &  self )), }}}}} deserializer .  deserialize_identifier ( KindVisitor )}}}}
+macro_rules! __ra_macro_fixture231 {($(# [ doc = $doc :  tt ])* ($($id :  ident ),* ), $ty :  ty , $func :  expr )=>{$(# [ doc = $doc ])*  impl < 'de $(, $id :  Deserialize < 'de >,)*>  Deserialize < 'de >  for $ty { fn  deserialize <  D > ( deserializer :  D )->  Result <  Self ,  D ::  Error >  where  D :  Deserializer < 'de >, { Deserialize ::  deserialize ( deserializer ).  map ($func )}}}}
+macro_rules! __ra_macro_fixture232 {($($T :  ident , )+ )=>{$(# [ cfg ( num_nonzero )] impl < 'de >  Deserialize < 'de >  for  num ::$T { fn  deserialize <  D > ( deserializer :  D )->  Result <  Self ,  D ::  Error >  where  D :  Deserializer < 'de >, { let  value =  try ! ( Deserialize ::  deserialize ( deserializer ));  match <  num ::$T >::  new ( value ){ Some ( nonzero )=> Ok ( nonzero ),  None => Err ( Error ::  custom ( "expected a non-zero value" )), }}})+ }; }
+macro_rules! __ra_macro_fixture233 {( Error :  Sized $(+ $($supertrait :  ident )::+)*)=>{# [ doc =  " The `Error` trait allows `Deserialize` implementations to create descriptive" ]# [ doc =  " error messages belonging to the `Deserializer` against which they are" ]# [ doc =  " currently running." ]# [ doc =  "" ]# [ doc =  " Every `Deserializer` declares an `Error` type that encompasses both" ]# [ doc =  " general-purpose deserialization errors as well as errors specific to the" ]# [ doc =  " particular deserialization format. For example the `Error` type of" ]# [ doc =  " `serde_json` can represent errors like an invalid JSON escape sequence or an" ]# [ doc =  " unterminated string literal, in addition to the error cases that are part of" ]# [ doc =  " this trait." ]# [ doc =  "" ]# [ doc =  " Most deserializers should only need to provide the `Error::custom` method" ]# [ doc =  " and inherit the default behavior for the other methods." ]# [ doc =  "" ]# [ doc =  " # Example implementation" ]# [ doc =  "" ]# [ doc =  " The [example data format] presented on the website shows an error" ]# [ doc =  " type appropriate for a basic JSON data format." ]# [ doc =  "" ]# [ doc =  " [example data format]: https://serde.rs/data-format.html" ] pub  trait  Error :  Sized $(+ $($supertrait )::+)* {# [ doc =  " Raised when there is general error when deserializing a type." ]# [ doc =  "" ]# [ doc =  " The message should not be capitalized and should not end with a period." ]# [ doc =  "" ]# [ doc =  " ```edition2018" ]# [ doc =  " # use std::str::FromStr;" ]# [ doc =  " #" ]# [ doc =  " # struct IpAddr;" ]# [ doc =  " #" ]# [ doc =  " # impl FromStr for IpAddr {" ]# [ doc =  " #     type Err = String;" ]# [ doc =  " #" ]# [ doc =  " #     fn from_str(_: &str) -> Result<Self, String> {" ]# [ doc =  " #         unimplemented!()" ]# [ doc =  " #     }" ]# [ doc =  " # }" ]# [ doc =  " #" ]# [ doc =  " use serde::de::{self, Deserialize, Deserializer};" ]# [ doc =  "" ]# [ doc =  " impl<\\\'de> Deserialize<\\\'de> for IpAddr {" ]# [ doc =  "     fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>" ]# [ doc =  "     where" ]# [ doc =  "         D: Deserializer<\\\'de>," ]# [ doc =  "     {" ]# [ doc =  "         let s = String::deserialize(deserializer)?;" ]# [ doc =  "         s.parse().map_err(de::Error::custom)" ]# [ doc =  "     }" ]# [ doc =  " }" ]# [ doc =  " ```" ] fn  custom <  T > ( msg :  T )->  Self  where  T :  Display ; # [ doc =  " Raised when a `Deserialize` receives a type different from what it was" ]# [ doc =  " expecting." ]# [ doc =  "" ]# [ doc =  " The `unexp` argument provides information about what type was received." ]# [ doc =  " This is the type that was present in the input file or other source data" ]# [ doc =  " of the Deserializer." ]# [ doc =  "" ]# [ doc =  " The `exp` argument provides information about what type was being" ]# [ doc =  " expected. This is the type that is written in the program." ]# [ doc =  "" ]# [ doc =  " For example if we try to deserialize a String out of a JSON file" ]# [ doc =  " containing an integer, the unexpected type is the integer and the" ]# [ doc =  " expected type is the string." ]# [ cold ] fn  invalid_type ( unexp :  Unexpected ,  exp : &  Expected )->  Self { Error ::  custom ( format_args ! ( "invalid type: {}, expected {}" ,  unexp ,  exp ))}# [ doc =  " Raised when a `Deserialize` receives a value of the right type but that" ]# [ doc =  " is wrong for some other reason." ]# [ doc =  "" ]# [ doc =  " The `unexp` argument provides information about what value was received." ]# [ doc =  " This is the value that was present in the input file or other source" ]# [ doc =  " data of the Deserializer." ]# [ doc =  "" ]# [ doc =  " The `exp` argument provides information about what value was being" ]# [ doc =  " expected. This is the type that is written in the program." ]# [ doc =  "" ]# [ doc =  " For example if we try to deserialize a String out of some binary data" ]# [ doc =  " that is not valid UTF-8, the unexpected value is the bytes and the" ]# [ doc =  " expected value is a string." ]# [ cold ] fn  invalid_value ( unexp :  Unexpected ,  exp : &  Expected )->  Self { Error ::  custom ( format_args ! ( "invalid value: {}, expected {}" ,  unexp ,  exp ))}# [ doc =  " Raised when deserializing a sequence or map and the input data contains" ]# [ doc =  " too many or too few elements." ]# [ doc =  "" ]# [ doc =  " The `len` argument is the number of elements encountered. The sequence" ]# [ doc =  " or map may have expected more arguments or fewer arguments." ]# [ doc =  "" ]# [ doc =  " The `exp` argument provides information about what data was being" ]# [ doc =  " expected. For example `exp` might say that a tuple of size 6 was" ]# [ doc =  " expected." ]# [ cold ] fn  invalid_length ( len :  usize ,  exp : &  Expected )->  Self { Error ::  custom ( format_args ! ( "invalid length {}, expected {}" ,  len ,  exp ))}# [ doc =  " Raised when a `Deserialize` enum type received a variant with an" ]# [ doc =  " unrecognized name." ]# [ cold ] fn  unknown_variant ( variant : &  str ,  expected : & 'static [& 'static  str ])->  Self { if  expected .  is_empty (){ Error ::  custom ( format_args ! ( "unknown variant `{}`, there are no variants" ,  variant ))} else { Error ::  custom ( format_args ! ( "unknown variant `{}`, expected {}" ,  variant ,  OneOf { names :  expected }))}}# [ doc =  " Raised when a `Deserialize` struct type received a field with an" ]# [ doc =  " unrecognized name." ]# [ cold ] fn  unknown_field ( field : &  str ,  expected : & 'static [& 'static  str ])->  Self { if  expected .  is_empty (){ Error ::  custom ( format_args ! ( "unknown field `{}`, there are no fields" ,  field ))} else { Error ::  custom ( format_args ! ( "unknown field `{}`, expected {}" ,  field ,  OneOf { names :  expected }))}}# [ doc =  " Raised when a `Deserialize` struct type expected to receive a required" ]# [ doc =  " field with a particular name but that field was not present in the" ]# [ doc =  " input." ]# [ cold ] fn  missing_field ( field : & 'static  str )->  Self { Error ::  custom ( format_args ! ( "missing field `{}`" ,  field ))}# [ doc