54 files changed, 1943 insertions, 1180 deletions
diff --git a/Cargo.lock b/Cargo.lock
index 7c07bddf9..669977163 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -76,15 +76,15 @@ dependencies = [
 [[package]]
 name = "bit-set"
-version = "0.5.0"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bit-vec 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bit-vec 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 [[package]]
 name = "bit-vec"
-version = "0.5.0"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
@@ -118,7 +118,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "cargo_metadata"
-version = "0.7.3"
+version = "0.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -359,11 +359,11 @@ dependencies = [
 [[package]]
 name = "flexi_logger"
-version = "0.11.1"
+version = "0.11.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "chrono 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glob 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
 "regex 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -444,6 +444,11 @@ version = "0.2.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
+name = "glob"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+[[package]]
 name = "heck"
 version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -503,7 +508,7 @@ dependencies = [
 [[package]]
 name = "insta"
-version = "0.7.1"
+version = "0.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "chrono 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -518,7 +523,7 @@ dependencies = [
 "serde 1.0.89 (registry+https://github.com/rust-lang/crates.io-index)",
 "serde_json 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
 "serde_yaml 0.8.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "uuid 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "uuid 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 [[package]]
@@ -589,9 +594,6 @@ dependencies = [
 name = "lazy_static"
 version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "spin 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 [[package]]
 name = "lazycell"
@@ -605,7 +607,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "linked-hash-map"
-version = "0.5.1"
+version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
@@ -855,10 +857,10 @@ dependencies = [
 [[package]]
 name = "proptest"
-version = "0.9.1"
+version = "0.9.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bit-set 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bit-set 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
 "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
 "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -911,7 +913,7 @@ dependencies = [
 "ra_hir 0.1.0",
 "ra_project_model 0.1.0",
 "ra_syntax 0.1.0",
- "ra_vfs 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ra_vfs 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 "rustc-hash 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 "test_utils 0.1.0",
 ]
@@ -922,14 +924,13 @@ version = "0.1.0"
 dependencies = [
 "clap 2.32.0 (registry+https://github.com/rust-lang/crates.io-index)",
 "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "flexi_logger 0.11.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "flexi_logger 0.11.2 (registry+https://github.com/rust-lang/crates.io-index)",
 "indicatif 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
 "join_to_string 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
 "ra_batch 0.1.0",
 "ra_db 0.1.0",
 "ra_hir 0.1.0",
 "ra_ide_api 0.1.0",
- "ra_ide_api_light 0.1.0",
 "ra_prof 0.1.0",
 "ra_syntax 0.1.0",
 "tools 0.1.0",
@@ -944,7 +945,7 @@ dependencies = [
 "ra_syntax 0.1.0",
 "relative-path 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 "rustc-hash 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "salsa 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "salsa 0.11.1 (registry+https://github.com/rust-lang/crates.io-index)",
 "test_utils 0.1.0",
 ]
@@ -962,8 +963,8 @@ version = "0.1.0"
 dependencies = [
 "arrayvec 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
 "ena 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "flexi_logger 0.11.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "flexi_logger 0.11.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "insta 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "insta 0.7.4 (registry+https://github.com/rust-lang/crates.io-index)",
 "join_to_string 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
 "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
 "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -983,19 +984,18 @@ name = "ra_ide_api"
 version = "0.1.0"
 dependencies = [
 "fst 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "insta 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "insta 0.7.4 (registry+https://github.com/rust-lang/crates.io-index)",
 "itertools 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
 "jemalloc-ctl 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 "jemallocator 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
 "join_to_string 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
 "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
 "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "proptest 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proptest 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
 "ra_assists 0.1.0",
 "ra_db 0.1.0",
 "ra_fmt 0.1.0",
 "ra_hir 0.1.0",
- "ra_ide_api_light 0.1.0",
 "ra_syntax 0.1.0",
 "ra_text_edit 0.1.0",
 "rayon 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1007,29 +1007,13 @@ dependencies = [
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 [[package]]
-name = "ra_ide_api_light"
-version = "0.1.0"
-dependencies = [
- "insta 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "itertools 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "join_to_string 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "proptest 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "ra_fmt 0.1.0",
- "ra_syntax 0.1.0",
- "ra_text_edit 0.1.0",
- "rustc-hash 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "superslice 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "test_utils 0.1.0",
-]
-[[package]]
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 "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 "failure_derive 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "flexi_logger 0.11.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "flexi_logger 0.11.2 (registry+https://github.com/rust-lang/crates.io-index)",
 "gen_lsp_server 0.1.0",
 "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -1040,7 +1024,7 @@ dependencies = [
 "ra_project_model 0.1.0",
 "ra_syntax 0.1.0",
 "ra_text_edit 0.1.0",
- "ra_vfs 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ra_vfs 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
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 "rustc-hash 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 "serde 1.0.89 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1080,7 +1064,7 @@ dependencies = [
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 version = "0.1.0"
 dependencies = [
- "cargo_metadata 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cargo_metadata 0.7.4 (registry+https://github.com/rust-lang/crates.io-index)",
 "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
 "ra_arena 0.1.0",
@@ -1115,7 +1099,7 @@ dependencies = [
 name = "ra_text_edit"
 version = "0.1.0"
 dependencies = [
- "proptest 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proptest 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
 "test_utils 0.1.0",
 "text_unit 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -1129,7 +1113,7 @@ dependencies = [
 [[package]]
 name = "ra_vfs"
-version = "0.2.0"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "crossbeam-channel 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1361,7 +1345,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "salsa"
-version = "0.10.0"
+version = "0.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "derive-new 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1370,13 +1354,13 @@ dependencies = [
 "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
 "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
 "rustc-hash 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "salsa-macros 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "salsa-macros 0.11.1 (registry+https://github.com/rust-lang/crates.io-index)",
 "smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
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-version = "0.10.0"
+version = "0.11.1"
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 dependencies = [
 "heck 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1446,7 +1430,7 @@ version = "0.8.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "dtoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "linked-hash-map 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "linked-hash-map 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
 "serde 1.0.89 (registry+https://github.com/rust-lang/crates.io-index)",
 "yaml-rust 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -1489,11 +1473,6 @@ dependencies = [
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 [[package]]
-name = "spin"
-version = "0.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-[[package]]
 name = "stable_deref_trait"
 version = "1.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1786,7 +1765,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "uuid"
-version = "0.7.2"
+version = "0.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1864,7 +1843,7 @@ name = "yaml-rust"
 version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "linked-hash-map 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "linked-hash-map 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 [metadata]
@@ -1877,14 +1856,14 @@ dependencies = [
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 "checksum backtrace-sys 0.1.28 (registry+https://github.com/rust-lang/crates.io-index)" = "797c830ac25ccc92a7f8a7b9862bde440715531514594a6154e3d4a54dd769b6"
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-"checksum bit-set 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "6f1efcc46c18245a69c38fcc5cc650f16d3a59d034f3106e9ed63748f695730a"
+"checksum bit-set 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "e84c238982c4b1e1ee668d136c510c67a13465279c0cb367ea6baf6310620a80"
-"checksum bit-vec 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "4440d5cb623bb7390ae27fec0bb6c61111969860f8e3ae198bfa0663645e67cf"
+"checksum bit-vec 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "f59bbe95d4e52a6398ec21238d31577f2b28a9d86807f06ca59d191d8440d0bb"
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-"checksum cargo_metadata 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)" = "bc796c7161c220089dfc7159e13324979181532850a237576b8fb907dd087c0d"
+"checksum cargo_metadata 0.7.4 (registry+https://github.com/rust-lang/crates.io-index)" = "178d62b240c34223f265a4c1e275e37d62da163d421fc8d7f7e3ee340f803c57"
 "checksum cc 1.0.31 (registry+https://github.com/rust-lang/crates.io-index)" = "c9ce8bb087aacff865633f0bd5aeaed910fe2fe55b55f4739527f2e023a2e53d"
 "checksum cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "11d43355396e872eefb45ce6342e4374ed7bc2b3a502d1b28e36d6e23c05d1f4"
 "checksum chrono 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "45912881121cb26fad7c38c17ba7daa18764771836b34fab7d3fbd93ed633878"
@@ -1913,7 +1892,7 @@ dependencies = [
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 "checksum fake-simd 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e88a8acf291dafb59c2d96e8f59828f3838bb1a70398823ade51a84de6a6deed"
 "checksum filetime 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "a2df5c1a8c4be27e7707789dc42ae65976e60b394afd293d1419ab915833e646"
-"checksum flexi_logger 0.11.1 (registry+https://github.com/rust-lang/crates.io-index)" = "4a7878fc9e06c948c6f9cddf571758e0c44786a509e646a094ef13ade3b1aab7"
+"checksum flexi_logger 0.11.2 (registry+https://github.com/rust-lang/crates.io-index)" = "005c01dd6942ca46283b7304d14c6d04ec2c87a62f6e62e17c06fb812a574f4a"
 "checksum fs_extra 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5f2a4a2034423744d2cc7ca2068453168dcdb82c438419e639a26bd87839c674"
 "checksum fsevent 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)" = "c4bbbf71584aeed076100b5665ac14e3d85eeb31fdbb45fbd41ef9a682b5ec05"
 "checksum fsevent-sys 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "1a772d36c338d07a032d5375a36f15f9a7043bf0cb8ce7cee658e037c6032874"
@@ -1923,6 +1902,7 @@ dependencies = [
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 "checksum generic-array 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ef25c5683767570c2bbd7deba372926a55eaae9982d7726ee2a1050239d45b9d"
 "checksum glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "8be18de09a56b60ed0edf84bc9df007e30040691af7acd1c41874faac5895bfb"
+"checksum glob 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "9b919933a397b79c37e33b77bb2aa3dc8eb6e165ad809e58ff75bc7db2e34574"
 "checksum heck 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "20564e78d53d2bb135c343b3f47714a56af2061f1c928fdb541dc7b9fdd94205"
 "checksum humansize 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b6cab2627acfc432780848602f3f558f7e9dd427352224b0d9324025796d2a5e"
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@@ -1930,7 +1910,7 @@ dependencies = [
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 "checksum inotify-sys 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "e74a1aa87c59aeff6ef2cc2fa62d41bc43f54952f55652656b18a02fd5e356c0"
-"checksum insta 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)" = "be9f00370d23dc7bd32a4d4506b1a14fb922fa39c576c3300fd25ce5b5dab18f"
+"checksum insta 0.7.4 (registry+https://github.com/rust-lang/crates.io-index)" = "03e7d88a87d342ce8bd698516151be43e6eb2e84b683db528696cb4a382f734a"
 "checksum iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "dbe6e417e7d0975db6512b90796e8ce223145ac4e33c377e4a42882a0e88bb08"
 "checksum itertools 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5b8467d9c1cebe26feb08c640139247fac215782d35371ade9a2136ed6085358"
 "checksum itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "1306f3464951f30e30d12373d31c79fbd52d236e5e896fd92f96ec7babbbe60b"
@@ -1942,7 +1922,7 @@ dependencies = [
 "checksum lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "bc5729f27f159ddd61f4df6228e827e86643d4d3e7c32183cb30a1c08f604a14"
 "checksum lazycell 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b294d6fa9ee409a054354afc4352b0b9ef7ca222c69b8812cbea9e7d2bf3783f"
 "checksum libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)" = "aab692d7759f5cd8c859e169db98ae5b52c924add2af5fbbca11d12fefb567c1"
-"checksum linked-hash-map 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "70fb39025bc7cdd76305867c4eccf2f2dcf6e9a57f5b21a93e1c2d86cd03ec9e"
+"checksum linked-hash-map 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "ae91b68aebc4ddb91978b11a1b02ddd8602a05ec19002801c5666000e05e0f83"
 "checksum lock_api 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "62ebf1391f6acad60e5c8b43706dde4582df75c06698ab44511d15016bc2442c"
 "checksum log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c84ec4b527950aa83a329754b01dbe3f58361d1c5efacd1f6d68c494d08a17c6"
 "checksum lsp-types 0.56.0 (registry+https://github.com/rust-lang/crates.io-index)" = "31954f2cf354421e6f99a48fdcfd5c3113c675a0db311960ffdac0b8d45cf09c"
@@ -1970,10 +1950,10 @@ dependencies = [
 "checksum pest_generator 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "63120576c4efd69615b5537d3d052257328a4ca82876771d6944424ccfd9f646"
 "checksum pest_meta 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f5a3492a4ed208ffc247adcdcc7ba2a95be3104f58877d0d02f0df39bf3efb5e"
 "checksum proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)" = "4d317f9caece796be1980837fd5cb3dfec5613ebdb04ad0956deea83ce168915"
-"checksum proptest 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)" = "8ea66c78d75f2c6e9f304269eaef90899798daecc69f1a625d5a3dd793ff3522"
+"checksum proptest 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)" = "24f5844db2f839e97e3021980975f6ebf8691d9b9b2ca67ed3feb38dc3edb52c"
 "checksum quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9274b940887ce9addde99c4eee6b5c44cc494b182b97e73dc8ffdcb3397fd3f0"
 "checksum quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)" = "cdd8e04bd9c52e0342b406469d494fcb033be4bdbe5c606016defbb1681411e1"
-"checksum ra_vfs 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "bb1839e4e003d865b58b8b6c231aae6c463dfcd01bfbbddffbdb7662a7b5a627"
+"checksum ra_vfs 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d75d08da053ec832676686c72dfe509fdd1e807191a50ac79087466ffefccb1c"
 "checksum rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)" = "6d71dacdc3c88c1fde3885a3be3fbab9f35724e6ce99467f7d9c5026132184ca"
 "checksum rand_chacha 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "556d3a1ca6600bfcbab7c7c91ccb085ac7fbbcd70e008a98742e7847f4f7bcef"
 "checksum rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6fdeb83b075e8266dcc8762c22776f6877a63111121f5f8c7411e5be7eed4b"
@@ -1999,8 +1979,8 @@ dependencies = [
 "checksum rustc-hash 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7540fc8b0c49f096ee9c961cda096467dce8084bec6bdca2fc83895fd9b28cb8"
 "checksum rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "138e3e0acb6c9fb258b19b67cb8abd63c00679d2851805ea151465464fe9030a"
 "checksum ryu 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "eb9e9b8cde282a9fe6a42dd4681319bfb63f121b8a8ee9439c6f4107e58a46f7"
-"checksum salsa 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "cad0e2348e2f80725b2980914a08a00267136c3ecf720896d3f7f08eef51e08f"
+"checksum salsa 0.11.1 (registry+https://github.com/rust-lang/crates.io-index)" = "94f14bbb013866db2fbeceb97ed82cf35f42020edd39d35268f0b11f89399c79"
-"checksum salsa-macros 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7c79744109df21b80aef1367669b0a9e4985bc966e76bf0e9321b222ec0b9fbb"
+"checksum salsa-macros 0.11.1 (registry+https://github.com/rust-lang/crates.io-index)" = "1ad27cbae189e9739a96e469d37c6a6deafec36f1282d4fdf4681eae67c9dd39"
 "checksum same-file 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "8f20c4be53a8a1ff4c1f1b2bd14570d2f634628709752f0702ecdd2b3f9a5267"
 "checksum scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "94258f53601af11e6a49f722422f6e3425c52b06245a5cf9bc09908b174f5e27"
 "checksum semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
@@ -2014,7 +1994,6 @@ dependencies = [
 "checksum slug 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "b3bc762e6a4b6c6fcaade73e77f9ebc6991b676f88bb2358bddb56560f073373"
 "checksum smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)" = "c4488ae950c49d403731982257768f48fada354a5203fe81f9bb6f43ca9002be"
 "checksum smol_str 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)" = "9af1035bc5d742ab6b7ab16713e41cc2ffe78cb474f6f43cd696b2d16052007e"
-"checksum spin 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "44363f6f51401c34e7be73db0db371c04705d35efbe9f7d6082e03a921a32c55"
 "checksum stable_deref_trait 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "dba1a27d3efae4351c8051072d619e3ade2820635c3958d826bfea39d59b54c8"
 "checksum strsim 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "bb4f380125926a99e52bc279241539c018323fab05ad6368b56f93d9369ff550"
 "checksum superslice 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ab16ced94dbd8a46c82fd81e3ed9a8727dac2977ea869d217bcc4ea1f122e81f"
@@ -2048,7 +2027,7 @@ dependencies = [
 "checksum url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)" = "dd4e7c0d531266369519a4aa4f399d748bd37043b00bde1e4ff1f60a120b355a"
 "checksum url_serde 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "74e7d099f1ee52f823d4bdd60c93c3602043c728f5db3b97bdb548467f7bddea"
 "checksum utf8-ranges 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "796f7e48bef87609f7ade7e06495a87d5cd06c7866e6a5cbfceffc558a243737"
-"checksum uuid 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)" = "0238db0c5b605dd1cf51de0f21766f97fba2645897024461d6a00c036819a768"
+"checksum uuid 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)" = "600ef8213e9f8a0ac1f876e470e90780ae0478eabce7f76aff41b0f4ef0fd5c0"
 "checksum vec_map 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "05c78687fb1a80548ae3250346c3db86a80a7cdd77bda190189f2d0a0987c81a"
 "checksum version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "914b1a6776c4c929a602fafd8bc742e06365d4bcbe48c30f9cca5824f70dc9dd"
 "checksum walkdir 2.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "9d9d7ed3431229a144296213105a390676cc49c9b6a72bd19f3176c98e129fa1"
diff --git a/README.md b/README.md
index 3a0c9dee1..8df991246 100644
--- a/README.md
+++ b/README.md
@@ -51,6 +51,12 @@ We are on the rust-lang Zulip!
 https://rust-lang.zulipchat.com/#narrow/stream/185405-t-compiler.2Frls-2.2E0
+## Quick Links
+* Work List: https://paper.dropbox.com/doc/RLS-2.0-work-list--AZ3BgHKKCtqszbsi3gi6sjchAQ-42vbnxzuKq2lKwW0mkn8Y
+* API docs: https://rust-analyzer.github.io/rust-analyzer/ra_ide_api/index.html
+* CI: https://travis-ci.org/rust-analyzer/rust-analyzer
 ## License
 Rust analyzer is primarily distributed under the terms of both the MIT
diff --git a/crates/ra_assists/src/flip_binexpr.rs b/crates/ra_assists/src/flip_binexpr.rs
new file mode 100644
index 000000000..ec377642e
--- /dev/null
+++ b/crates/ra_assists/src/flip_binexpr.rs
@@ -0,0 +1,141 @@
+use hir::db::HirDatabase;
+use ra_syntax::ast::{AstNode, BinExpr, BinOp};
+use crate::{AssistCtx, Assist, AssistId};
+/// Flip binary expression assist.
+pub(crate) fn flip_binexpr(mut ctx: AssistCtx<impl HirDatabase>) -> Option<Assist> {
+    let expr = ctx.node_at_offset::<BinExpr>()?;
+    let lhs = expr.lhs()?.syntax();
+    let rhs = expr.rhs()?.syntax();
+    let op_range = expr.op()?.range();
+    // The assist should be applied only if the cursor is on the operator
+    let cursor_in_range = ctx.frange.range.is_subrange(&op_range);
+    if !cursor_in_range {
+        return None;
+    }
+    let action: FlipAction = expr.op_kind()?.into();
+    // The assist should not be applied for certain operators
+    if let FlipAction::DontFlip = action {
+        return None;
+    }
+    ctx.add_action(AssistId("flip_binexpr"), "flip binary expression", |edit| {
+        edit.target(op_range);
+        if let FlipAction::FlipAndReplaceOp(new_op) = action {
+            edit.replace(op_range, new_op);
+        }
+        edit.replace(lhs.range(), rhs.text());
+        edit.replace(rhs.range(), lhs.text());
+    });
+    ctx.build()
+}
+enum FlipAction {
+    // Flip the expression
+    Flip,
+    // Flip the expression and replace the operator with this string
+    FlipAndReplaceOp(&'static str),
+    // Do not flip the expression
+    DontFlip,
+}
+impl From<BinOp> for FlipAction {
+    fn from(op_kind: BinOp) -> Self {
+        match op_kind {
+            BinOp::Assignment => FlipAction::DontFlip,
+            BinOp::AddAssign => FlipAction::DontFlip,
+            BinOp::DivAssign => FlipAction::DontFlip,
+            BinOp::MulAssign => FlipAction::DontFlip,
+            BinOp::RemAssign => FlipAction::DontFlip,
+            BinOp::ShrAssign => FlipAction::DontFlip,
+            BinOp::ShlAssign => FlipAction::DontFlip,
+            BinOp::SubAssign => FlipAction::DontFlip,
+            BinOp::BitOrAssign => FlipAction::DontFlip,
+            BinOp::BitAndAssign => FlipAction::DontFlip,
+            BinOp::BitXorAssign => FlipAction::DontFlip,
+            BinOp::GreaterTest => FlipAction::FlipAndReplaceOp("<"),
+            BinOp::GreaterEqualTest => FlipAction::FlipAndReplaceOp("<="),
+            BinOp::LesserTest => FlipAction::FlipAndReplaceOp(">"),
+            BinOp::LesserEqualTest => FlipAction::FlipAndReplaceOp(">="),
+            _ => FlipAction::Flip,
+        }
+    }
+}
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::helpers::{ check_assist, check_assist_target, check_assist_not_applicable };
+    #[test]
+    fn flip_binexpr_target_is_the_op() {
+        check_assist_target(flip_binexpr, "fn f() { let res = 1 ==<|> 2; }", "==")
+    }
+    #[test]
+    fn flip_binexpr_not_applicable_for_assignment() {
+        check_assist_not_applicable(flip_binexpr, "fn f() { let mut _x = 1; _x +=<|> 2 }")
+    }
+    #[test]
+    fn flip_binexpr_works_for_eq() {
+        check_assist(
+            flip_binexpr,
+            "fn f() { let res = 1 ==<|> 2; }",
+            "fn f() { let res = 2 ==<|> 1; }",
+        )
+    }
+    #[test]
+    fn flip_binexpr_works_for_gt() {
+        check_assist(
+            flip_binexpr,
+            "fn f() { let res = 1 ><|> 2; }",
+            "fn f() { let res = 2 <<|> 1; }",
+        )
+    }
+    #[test]
+    fn flip_binexpr_works_for_lteq() {
+        check_assist(
+            flip_binexpr,
+            "fn f() { let res = 1 <=<|> 2; }",
+            "fn f() { let res = 2 >=<|> 1; }",
+        )
+    }
+    #[test]
+    fn flip_binexpr_works_for_complex_expr() {
+        check_assist(
+            flip_binexpr,
+            "fn f() { let res = (1 + 1) ==<|> (2 + 2); }",
+            "fn f() { let res = (2 + 2) ==<|> (1 + 1); }",
+        )
+    }
+    #[test]
+    fn flip_binexpr_works_inside_match() {
+        check_assist(
+            flip_binexpr,
+            r#"
+            fn dyn_eq(&self, other: &dyn Diagnostic) -> bool {
+                match other.downcast_ref::<Self>() {
+                    None => false,
+                    Some(it) => it ==<|> self,
+                }
+            }
+            "#,
+            r#"
+            fn dyn_eq(&self, other: &dyn Diagnostic) -> bool {
+                match other.downcast_ref::<Self>() {
+                    None => false,
+                    Some(it) => self ==<|> it,
+                }
+            }
+            "#,
+        )
+    }
+}
diff --git a/crates/ra_assists/src/flip_eq_operands.rs b/crates/ra_assists/src/flip_eq_operands.rs
deleted file mode 100644
index df0bb689d..000000000
--- a/crates/ra_assists/src/flip_eq_operands.rs
+++ /dev/null
@@ -1,86 +0,0 @@
-use hir::db::HirDatabase;
-use ra_syntax::ast::{AstNode, BinExpr, BinOp};
-use crate::{AssistCtx, Assist, AssistId};
-pub(crate) fn flip_eq_operands(mut ctx: AssistCtx<impl HirDatabase>) -> Option<Assist> {
-    let expr = ctx.node_at_offset::<BinExpr>()?;
-    let lhs = expr.lhs()?.syntax();
-    let rhs = expr.rhs()?.syntax();
-    let op_range = expr.op()?.range();
-    let cursor_in_range = ctx.frange.range.is_subrange(&op_range);
-    let allowed_ops = [BinOp::EqualityTest, BinOp::NegatedEqualityTest];
-    let expr_op = expr.op_kind()?;
-    if !cursor_in_range || !allowed_ops.iter().any(|o| *o == expr_op) {
-        return None;
-    }
-    ctx.add_action(AssistId("flip_eq_operands"), "flip equality operands", |edit| {
-        edit.target(op_range);
-        edit.replace(lhs.range(), rhs.text());
-        edit.replace(rhs.range(), lhs.text());
-    });
-    ctx.build()
-}
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use crate::helpers::{check_assist, check_assist_target};
-    #[test]
-    fn flip_eq_operands_for_simple_stmt() {
-        check_assist(
-            flip_eq_operands,
-            "fn f() { let res = 1 ==<|> 2; }",
-            "fn f() { let res = 2 ==<|> 1; }",
-        )
-    }
-    #[test]
-    fn flip_neq_operands_for_simple_stmt() {
-        check_assist(
-            flip_eq_operands,
-            "fn f() { let res = 1 !=<|> 2; }",
-            "fn f() { let res = 2 !=<|> 1; }",
-        )
-    }
-    #[test]
-    fn flip_eq_operands_for_complex_stmt() {
-        check_assist(
-            flip_eq_operands,
-            "fn f() { let res = (1 + 1) ==<|> (2 + 2); }",
-            "fn f() { let res = (2 + 2) ==<|> (1 + 1); }",
-        )
-    }
-    #[test]
-    fn flip_eq_operands_in_match_expr() {
-        check_assist(
-            flip_eq_operands,
-            r#"
-            fn dyn_eq(&self, other: &dyn Diagnostic) -> bool {
-                match other.downcast_ref::<Self>() {
-                    None => false,
-                    Some(it) => it ==<|> self,
-                }
-            }
-            "#,
-            r#"
-            fn dyn_eq(&self, other: &dyn Diagnostic) -> bool {
-                match other.downcast_ref::<Self>() {
-                    None => false,
-                    Some(it) => self ==<|> it,
-                }
-            }
-            "#,
-        )
-    }
-    #[test]
-    fn flip_eq_operands_target() {
-        check_assist_target(flip_eq_operands, "fn f() { let res = 1 ==<|> 2; }", "==")
-    }
-}
diff --git a/crates/ra_assists/src/inline_local_variable.rs b/crates/ra_assists/src/inline_local_variable.rs
new file mode 100644
index 000000000..bd3cdb970
--- /dev/null
+++ b/crates/ra_assists/src/inline_local_variable.rs
@@ -0,0 +1,298 @@
+use hir::db::HirDatabase;
+use hir::source_binder::function_from_child_node;
+use ra_syntax::{ast::{self, AstNode}, TextRange};
+use ra_syntax::ast::{PatKind, ExprKind};
+use crate::{Assist, AssistCtx, AssistId};
+use crate::assist_ctx::AssistBuilder;
+pub(crate) fn inline_local_varialbe(mut ctx: AssistCtx<impl HirDatabase>) -> Option<Assist> {
+    let let_stmt = ctx.node_at_offset::<ast::LetStmt>()?;
+    let bind_pat = match let_stmt.pat()?.kind() {
+        PatKind::BindPat(pat) => pat,
+        _ => return None,
+    };
+    if bind_pat.is_mutable() {
+        return None;
+    }
+    let initializer = let_stmt.initializer()?;
+    let wrap_in_parens = match initializer.kind() {
+        ExprKind::LambdaExpr(_)
+        | ExprKind::IfExpr(_)
+        | ExprKind::LoopExpr(_)
+        | ExprKind::ForExpr(_)
+        | ExprKind::WhileExpr(_)
+        | ExprKind::ContinueExpr(_)
+        | ExprKind::BreakExpr(_)
+        | ExprKind::Label(_)
+        | ExprKind::ReturnExpr(_)
+        | ExprKind::MatchExpr(_)
+        | ExprKind::StructLit(_)
+        | ExprKind::CastExpr(_)
+        | ExprKind::PrefixExpr(_)
+        | ExprKind::RangeExpr(_)
+        | ExprKind::BinExpr(_) => true,
+        ExprKind::CallExpr(_)
+        | ExprKind::IndexExpr(_)
+        | ExprKind::MethodCallExpr(_)
+        | ExprKind::FieldExpr(_)
+        | ExprKind::TryExpr(_)
+        | ExprKind::RefExpr(_)
+        | ExprKind::Literal(_)
+        | ExprKind::TupleExpr(_)
+        | ExprKind::ArrayExpr(_)
+        | ExprKind::ParenExpr(_)
+        | ExprKind::PathExpr(_)
+        | ExprKind::BlockExpr(_) => false,
+    };
+    let delete_range = if let Some(whitespace) =
+        let_stmt.syntax().next_sibling().and_then(ast::Whitespace::cast)
+    {
+        TextRange::from_to(let_stmt.syntax().range().start(), whitespace.syntax().range().end())
+    } else {
+        let_stmt.syntax().range()
+    };
+    let init_str = if wrap_in_parens {
+        format!("({})", initializer.syntax().text().to_string())
+    } else {
+        initializer.syntax().text().to_string()
+    };
+    let function = function_from_child_node(ctx.db, ctx.frange.file_id, bind_pat.syntax())?;
+    let scope = function.scopes(ctx.db);
+    let refs = scope.find_all_refs(bind_pat);
+    ctx.add_action(
+        AssistId("inline_local_variable"),
+        "inline local variable",
+        move |edit: &mut AssistBuilder| {
+            edit.delete(delete_range);
+            for desc in refs {
+                edit.replace(desc.range, init_str.clone())
+            }
+            edit.set_cursor(delete_range.start())
+        },
+    );
+    ctx.build()
+}
+#[cfg(test)]
+mod tests {
+    use crate::helpers::{check_assist, check_assist_not_applicable};
+    use super::*;
+    #[test]
+    fn test_inline_let_bind_literal_expr() {
+        check_assist(
+            inline_local_varialbe,
+            "
+fn bar(a: usize) {}
+fn foo() {
+    let a<|> = 1;
+    a + 1;
+    if a > 10 {
+    }
+    while a > 10 {
+    }
+    let b = a * 10;
+    bar(a);
+}",
+            "
+fn bar(a: usize) {}
+fn foo() {
+    <|>1 + 1;
+    if 1 > 10 {
+    }
+    while 1 > 10 {
+    }
+    let b = 1 * 10;
+    bar(1);
+}",
+        );
+    }
+    #[test]
+    fn test_inline_let_bind_bin_expr() {
+        check_assist(
+            inline_local_varialbe,
+            "
+fn bar(a: usize) {}
+fn foo() {
+    let a<|> = 1 + 1;
+    a + 1;
+    if a > 10 {
+    }
+    while a > 10 {
+    }
+    let b = a * 10;
+    bar(a);
+}",
+            "
+fn bar(a: usize) {}
+fn foo() {
+    <|>(1 + 1) + 1;
+    if (1 + 1) > 10 {
+    }
+    while (1 + 1) > 10 {
+    }
+    let b = (1 + 1) * 10;
+    bar((1 + 1));
+}",
+        );
+    }
+    #[test]
+    fn test_inline_let_bind_function_call_expr() {
+        check_assist(
+            inline_local_varialbe,
+            "
+fn bar(a: usize) {}
+fn foo() {
+    let a<|> = bar(1);
+    a + 1;
+    if a > 10 {
+    }
+    while a > 10 {
+    }
+    let b = a * 10;
+    bar(a);
+}",
+            "
+fn bar(a: usize) {}
+fn foo() {
+    <|>bar(1) + 1;
+    if bar(1) > 10 {
+    }
+    while bar(1) > 10 {
+    }
+    let b = bar(1) * 10;
+    bar(bar(1));
+}",
+        );
+    }
+    #[test]
+    fn test_inline_let_bind_cast_expr() {
+        check_assist(
+            inline_local_varialbe,
+            "
+fn bar(a: usize): usize { a }
+fn foo() {
+    let a<|> = bar(1) as u64;
+    a + 1;
+    if a > 10 {
+    }
+    while a > 10 {
+    }
+    let b = a * 10;
+    bar(a);
+}",
+            "
+fn bar(a: usize): usize { a }
+fn foo() {
+    <|>(bar(1) as u64) + 1;
+    if (bar(1) as u64) > 10 {
+    }
+    while (bar(1) as u64) > 10 {
+    }
+    let b = (bar(1) as u64) * 10;
+    bar((bar(1) as u64));
+}",
+        );
+    }
+    #[test]
+    fn test_inline_let_bind_block_expr() {
+        check_assist(
+            inline_local_varialbe,
+            "
+fn foo() {
+    let a<|> = { 10 + 1 };
+    a + 1;
+    if a > 10 {
+    }
+    while a > 10 {
+    }
+    let b = a * 10;
+    bar(a);
+}",
+            "
+fn foo() {
+    <|>{ 10 + 1 } + 1;
+    if { 10 + 1 } > 10 {
+    }
+    while { 10 + 1 } > 10 {
+    }
+    let b = { 10 + 1 } * 10;
+    bar({ 10 + 1 });
+}",
+        );
+    }
+    #[test]
+    fn test_inline_let_bind_paren_expr() {
+        check_assist(
+            inline_local_varialbe,
+            "
+fn foo() {
+    let a<|> = ( 10 + 1 );
+    a + 1;
+    if a > 10 {
+    }
+    while a > 10 {
+    }
+    let b = a * 10;
+    bar(a);
+}",
+            "
+fn foo() {
+    <|>( 10 + 1 ) + 1;
+    if ( 10 + 1 ) > 10 {
+    }
+    while ( 10 + 1 ) > 10 {
+    }
+    let b = ( 10 + 1 ) * 10;
+    bar(( 10 + 1 ));
+}",
+        );
+    }
+    #[test]
+    fn test_not_inline_mut_variable() {
+        check_assist_not_applicable(
+            inline_local_varialbe,
+            "
+fn foo() {
+    let mut a<|> = 1 + 1;
+    a + 1;
+}",
+        );
+    }
+}
diff --git a/crates/ra_assists/src/lib.rs b/crates/ra_assists/src/lib.rs
index 8900fbc4b..c1514f8e5 100644
--- a/crates/ra_assists/src/lib.rs
+++ b/crates/ra_assists/src/lib.rs
@@ -88,11 +88,12 @@ where
 mod add_derive;
 mod add_impl;
 mod flip_comma;
-mod flip_eq_operands;
+mod flip_binexpr;
 mod change_visibility;
 mod fill_match_arms;
 mod fill_struct_fields;
 mod introduce_variable;
+mod inline_local_variable;
 mod replace_if_let_with_match;
 mod split_import;
 mod remove_dbg;
@@ -107,7 +108,7 @@ fn all_assists<DB: HirDatabase>() -> &'static [fn(AssistCtx<DB>) -> Option<Assis
        fill_match_arms::fill_match_arms,
        fill_struct_fields::fill_struct_fields,
        flip_comma::flip_comma,
-        flip_eq_operands::flip_eq_operands,
+        flip_binexpr::flip_binexpr,
        introduce_variable::introduce_variable,
        replace_if_let_with_match::replace_if_let_with_match,
        split_import::split_import,
@@ -115,6 +116,7 @@ fn all_assists<DB: HirDatabase>() -> &'static [fn(AssistCtx<DB>) -> Option<Assis
        auto_import::auto_import,
        add_missing_impl_members::add_missing_impl_members,
        add_missing_impl_members::add_missing_default_members,
+        inline_local_variable::inline_local_varialbe,
    ]
 }
diff --git a/crates/ra_cli/Cargo.toml b/crates/ra_cli/Cargo.toml
index a92a63257..328b2436f 100644
--- a/crates/ra_cli/Cargo.toml
+++ b/crates/ra_cli/Cargo.toml
@@ -14,7 +14,6 @@ indicatif = "0.11.0"
 ra_syntax = { path = "../ra_syntax" }
 ra_ide_api = { path = "../ra_ide_api" }
-ra_ide_api_light = { path = "../ra_ide_api_light" }
 tools = { path = "../tools" }
 ra_batch = { path = "../ra_batch" }
 ra_hir = { path = "../ra_hir" }
diff --git a/crates/ra_cli/src/main.rs b/crates/ra_cli/src/main.rs
index c13c7910c..ecea516f1 100644
--- a/crates/ra_cli/src/main.rs
+++ b/crates/ra_cli/src/main.rs
@@ -5,7 +5,7 @@ use std::{fs, io::Read, path::Path};
 use clap::{App, Arg, SubCommand};
 use join_to_string::join;
 use ra_ide_api::{Analysis, FileRange};
-use ra_ide_api_light::file_structure;
+use ra_ide_api::file_structure;
 use ra_syntax::{SourceFile, TextRange, TreeArc, AstNode};
 use tools::collect_tests;
 use flexi_logger::Logger;
diff --git a/crates/ra_db/Cargo.toml b/crates/ra_db/Cargo.toml
index c9b8f3c8e..581cd32fd 100644
--- a/crates/ra_db/Cargo.toml
+++ b/crates/ra_db/Cargo.toml
@@ -5,7 +5,7 @@ version = "0.1.0"
 authors = ["rust-analyzer developers"]
 [dependencies]
-salsa = "0.10.0"
+salsa = "0.11.1"
 relative-path = "0.4.0"
 rustc-hash = "1.0"
 parking_lot = "0.7.0"
diff --git a/crates/ra_hir/src/code_model_api.rs b/crates/ra_hir/src/code_model_api.rs
index 45fa4cd11..624c25c4d 100644
--- a/crates/ra_hir/src/code_model_api.rs
+++ b/crates/ra_hir/src/code_model_api.rs
@@ -1,8 +1,7 @@
 use std::sync::Arc;
-use relative_path::RelativePathBuf;
 use ra_db::{CrateId, SourceRootId, Edition};
-use ra_syntax::{ast::self, TreeArc, SyntaxNode};
+use ra_syntax::{ast::self, TreeArc};
 use crate::{
    Name, ScopesWithSourceMap, Ty, HirFileId,
@@ -14,9 +13,11 @@ use crate::{
    adt::{EnumVariantId, StructFieldId, VariantDef},
    generics::GenericParams,
    docs::{Documentation, Docs, docs_from_ast},
-    ids::{FunctionId, StructId, EnumId, AstItemDef, ConstId, StaticId, TraitId, TypeId},
+    ids::{FunctionId, StructId, EnumId, AstItemDef, ConstId, StaticId, TraitId, TypeAliasId},
    impl_block::ImplBlock,
    resolve::Resolver,
+    diagnostics::DiagnosticSink,
+    traits::{TraitItem, TraitData},
 };
 /// hir::Crate describes a single crate. It's the main interface with which
@@ -95,11 +96,6 @@ pub enum ModuleSource {
    Module(TreeArc<ast::Module>),
 }
-#[derive(Clone, Debug, Hash, PartialEq, Eq)]
-pub enum Problem {
-    UnresolvedModule { candidate: RelativePathBuf },
-}
 impl Module {
    /// Name of this module.
    pub fn name(&self, db: &impl HirDatabase) -> Option<Name> {
@@ -171,8 +167,24 @@ impl Module {
        db.crate_def_map(self.krate)[self.module_id].scope.clone()
    }
-    pub fn problems(&self, db: &impl HirDatabase) -> Vec<(TreeArc<SyntaxNode>, Problem)> {
+    pub fn diagnostics(&self, db: &impl HirDatabase, sink: &mut DiagnosticSink) {
-        self.problems_impl(db)
+        db.crate_def_map(self.krate).add_diagnostics(db, self.module_id, sink);
+        for decl in self.declarations(db) {
+            match decl {
+                crate::ModuleDef::Function(f) => f.diagnostics(db, sink),
+                crate::ModuleDef::Module(f) => f.diagnostics(db, sink),
+                _ => (),
+            }
+        }
+        for impl_block in self.impl_blocks(db) {
+            for item in impl_block.items(db) {
+                match item {
+                    crate::ImplItem::Method(f) => f.diagnostics(db, sink),
+                    _ => (),
+                }
+            }
+        }
    }
    pub fn resolver(&self, db: &impl HirDatabase) -> Resolver {
@@ -519,6 +531,10 @@ impl Function {
        let r = if !p.params.is_empty() { r.push_generic_params_scope(p) } else { r };
        r
    }
+    pub fn diagnostics(&self, db: &impl HirDatabase, sink: &mut DiagnosticSink) {
+        self.infer(db).add_diagnostics(db, *self, sink);
+    }
 }
 impl Docs for Function {
@@ -634,6 +650,18 @@ impl Trait {
    pub fn generic_params(&self, db: &impl DefDatabase) -> Arc<GenericParams> {
        db.generic_params((*self).into())
    }
+    pub fn name(self, db: &impl DefDatabase) -> Option<Name> {
+        self.trait_data(db).name().clone()
+    }
+    pub fn items(self, db: &impl DefDatabase) -> Vec<TraitItem> {
+        self.trait_data(db).items().to_vec()
+    }
+    pub(crate) fn trait_data(self, db: &impl DefDatabase) -> Arc<TraitData> {
+        db.trait_data(self)
+    }
 }
 impl Docs for Trait {
@@ -644,7 +672,7 @@ impl Docs for Trait {
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub struct TypeAlias {
-    pub(crate) id: TypeId,
+    pub(crate) id: TypeAliasId,
 }
 impl TypeAlias {
diff --git a/crates/ra_hir/src/code_model_impl/module.rs b/crates/ra_hir/src/code_model_impl/module.rs
index 52a33e981..0edb8ade5 100644
--- a/crates/ra_hir/src/code_model_impl/module.rs
+++ b/crates/ra_hir/src/code_model_impl/module.rs
@@ -1,18 +1,18 @@
 use ra_db::FileId;
-use ra_syntax::{ast, SyntaxNode, TreeArc, AstNode};
+use ra_syntax::{ast, TreeArc};
 use crate::{
-    Module, ModuleSource, Problem, Name,
+    Module, ModuleSource, Name, AstId,
    nameres::{CrateModuleId, ImportId},
    HirDatabase, DefDatabase,
-    HirFileId, SourceItemId,
+    HirFileId,
 };
 impl ModuleSource {
    pub(crate) fn new(
        db: &impl DefDatabase,
        file_id: Option<FileId>,
-        decl_id: Option<SourceItemId>,
+        decl_id: Option<AstId<ast::Module>>,
    ) -> ModuleSource {
        match (file_id, decl_id) {
            (Some(file_id), _) => {
@@ -20,8 +20,7 @@ impl ModuleSource {
                ModuleSource::SourceFile(source_file)
            }
            (None, Some(item_id)) => {
-                let module = db.file_item(item_id);
+                let module = item_id.to_node(db);
-                let module = ast::Module::cast(&*module).unwrap();
                assert!(module.item_list().is_some(), "expected inline module");
                ModuleSource::Module(module.to_owned())
            }
@@ -55,7 +54,7 @@ impl Module {
        let decl_id = def_map[self.module_id].declaration;
        let file_id = def_map[self.module_id].definition;
        let module_source = ModuleSource::new(db, file_id, decl_id);
-        let file_id = file_id.map(HirFileId::from).unwrap_or_else(|| decl_id.unwrap().file_id);
+        let file_id = file_id.map(HirFileId::from).unwrap_or_else(|| decl_id.unwrap().file_id());
        (file_id, module_source)
    }
@@ -65,9 +64,8 @@ impl Module {
    ) -> Option<(HirFileId, TreeArc<ast::Module>)> {
        let def_map = db.crate_def_map(self.krate);
        let decl = def_map[self.module_id].declaration?;
-        let syntax_node = db.file_item(decl);
+        let ast = decl.to_node(db);
-        let ast = ast::Module::cast(&syntax_node).unwrap().to_owned();
+        Some((decl.file_id(), ast))
-        Some((decl.file_id, ast))
    }
    pub(crate) fn import_source_impl(
@@ -76,7 +74,7 @@ impl Module {
        import: ImportId,
    ) -> TreeArc<ast::PathSegment> {
        let (file_id, source) = self.definition_source(db);
-        let (_, source_map) = db.raw_items_with_source_map(file_id.original_file(db));
+        let (_, source_map) = db.raw_items_with_source_map(file_id);
        source_map.get(&source, import)
    }
@@ -108,19 +106,4 @@ impl Module {
        let parent_id = def_map[self.module_id].parent?;
        Some(self.with_module_id(parent_id))
    }
-    pub(crate) fn problems_impl(
-        &self,
-        db: &impl HirDatabase,
-    ) -> Vec<(TreeArc<SyntaxNode>, Problem)> {
-        let def_map = db.crate_def_map(self.krate);
-        let (my_file_id, _) = self.definition_source(db);
-        // FIXME: not entirely corret filterint by module
-        def_map
-            .problems()
-            .iter()
-            .filter(|(source_item_id, _problem)| my_file_id == source_item_id.file_id)
-            .map(|(source_item_id, problem)| (db.file_item(*source_item_id), problem.clone()))
-            .collect()
-    }
 }
diff --git a/crates/ra_hir/src/db.rs b/crates/ra_hir/src/db.rs
index d3908f8ac..147005848 100644
--- a/crates/ra_hir/src/db.rs
+++ b/crates/ra_hir/src/db.rs
@@ -1,10 +1,10 @@
 use std::sync::Arc;
 use ra_syntax::{SyntaxNode, TreeArc, SourceFile};
-use ra_db::{SourceDatabase, salsa, FileId};
+use ra_db::{SourceDatabase, salsa};
 use crate::{
-    HirFileId, SourceFileItems, SourceItemId, Crate, Module, HirInterner,
+    HirFileId, MacroDefId, AstIdMap, ErasedFileAstId, Crate, Module, HirInterner,
    Function, FnSignature, ExprScopes, TypeAlias,
    Struct, Enum, StructField,
    Const, ConstSignature, Static,
@@ -14,11 +14,15 @@ use crate::{
    impl_block::{ModuleImplBlocks, ImplSourceMap},
    generics::{GenericParams, GenericDef},
    type_ref::TypeRef,
+    traits::TraitData, Trait, ty::TraitRef
 };
 #[salsa::query_group(DefDatabaseStorage)]
 pub trait DefDatabase: SourceDatabase + AsRef<HirInterner> {
-    #[salsa::invoke(HirFileId::hir_parse)]
+    #[salsa::invoke(crate::ids::macro_def_query)]
+    fn macro_def(&self, macro_id: MacroDefId) -> Option<Arc<mbe::MacroRules>>;
+    #[salsa::invoke(HirFileId::hir_parse_query)]
    fn hir_parse(&self, file_id: HirFileId) -> TreeArc<SourceFile>;
    #[salsa::invoke(crate::adt::StructData::struct_data_query)]
@@ -27,17 +31,23 @@ pub trait DefDatabase: SourceDatabase + AsRef<HirInterner> {
    #[salsa::invoke(crate::adt::EnumData::enum_data_query)]
    fn enum_data(&self, e: Enum) -> Arc<EnumData>;
-    #[salsa::invoke(crate::ids::SourceFileItems::file_items_query)]
+    #[salsa::invoke(crate::traits::TraitData::trait_data_query)]
-    fn file_items(&self, file_id: HirFileId) -> Arc<SourceFileItems>;
+    fn trait_data(&self, t: Trait) -> Arc<TraitData>;
+    #[salsa::invoke(crate::source_id::AstIdMap::ast_id_map_query)]
+    fn ast_id_map(&self, file_id: HirFileId) -> Arc<AstIdMap>;
-    #[salsa::invoke(crate::ids::SourceFileItems::file_item_query)]
+    #[salsa::invoke(crate::source_id::AstIdMap::file_item_query)]
-    fn file_item(&self, source_item_id: SourceItemId) -> TreeArc<SyntaxNode>;
+    fn ast_id_to_node(&self, file_id: HirFileId, ast_id: ErasedFileAstId) -> TreeArc<SyntaxNode>;
    #[salsa::invoke(RawItems::raw_items_query)]
-    fn raw_items(&self, file_id: FileId) -> Arc<RawItems>;
+    fn raw_items(&self, file_id: HirFileId) -> Arc<RawItems>;
    #[salsa::invoke(RawItems::raw_items_with_source_map_query)]
-    fn raw_items_with_source_map(&self, file_id: FileId) -> (Arc<RawItems>, Arc<ImportSourceMap>);
+    fn raw_items_with_source_map(
+        &self,
+        file_id: HirFileId,
+    ) -> (Arc<RawItems>, Arc<ImportSourceMap>);
    #[salsa::invoke(CrateDefMap::crate_def_map_query)]
    fn crate_def_map(&self, krate: Crate) -> Arc<CrateDefMap>;
@@ -98,6 +108,9 @@ pub trait HirDatabase: DefDatabase {
    #[salsa::invoke(crate::ty::method_resolution::CrateImplBlocks::impls_in_crate_query)]
    fn impls_in_crate(&self, krate: Crate) -> Arc<CrateImplBlocks>;
+    #[salsa::invoke(crate::ty::method_resolution::implements)]
+    fn implements(&self, trait_ref: TraitRef) -> bool;
 }
 #[test]
diff --git a/crates/ra_hir/src/diagnostics.rs b/crates/ra_hir/src/diagnostics.rs
new file mode 100644
index 000000000..d6a51b833
--- /dev/null
+++ b/crates/ra_hir/src/diagnostics.rs
@@ -0,0 +1,115 @@
+use std::{fmt, any::Any};
+use ra_syntax::{SyntaxNodePtr, TreeArc, AstPtr, TextRange, ast, SyntaxNode};
+use relative_path::RelativePathBuf;
+use crate::{HirFileId, HirDatabase};
+/// Diagnostic defines hir API for errors and warnings.
+///
+/// It is used as a `dyn` object, which you can downcast to a concrete
+/// diagnostic. DiagnosticSink are structured, meaning that they include rich
+/// information which can be used by IDE to create fixes. DiagnosticSink are
+/// expressed in terms of macro-expanded syntax tree nodes (so, it's a bad idea
+/// to diagnostic in a salsa value).
+///
+/// Internally, various subsystems of hir produce diagnostics specific to a
+/// subsystem (typically, an `enum`), which are safe to store in salsa but do not
+/// include source locations. Such internal diagnostic are transformed into an
+/// instance of `Diagnostic` on demand.
+pub trait Diagnostic: Any + Send + Sync + fmt::Debug + 'static {
+    fn message(&self) -> String;
+    fn file(&self) -> HirFileId;
+    fn syntax_node_ptr(&self) -> SyntaxNodePtr;
+    fn highlight_range(&self) -> TextRange {
+        self.syntax_node_ptr().range()
+    }
+    fn as_any(&self) -> &(dyn Any + Send + 'static);
+}
+impl dyn Diagnostic {
+    pub fn syntax_node(&self, db: &impl HirDatabase) -> TreeArc<SyntaxNode> {
+        let source_file = db.hir_parse(self.file());
+        self.syntax_node_ptr().to_node(&source_file).to_owned()
+    }
+    pub fn downcast_ref<D: Diagnostic>(&self) -> Option<&D> {
+        self.as_any().downcast_ref()
+    }
+}
+pub struct DiagnosticSink<'a> {
+    callbacks: Vec<Box<dyn FnMut(&dyn Diagnostic) -> Result<(), ()> + 'a>>,
+    default_callback: Box<dyn FnMut(&dyn Diagnostic) + 'a>,
+}
+impl<'a> DiagnosticSink<'a> {
+    pub fn new(cb: impl FnMut(&dyn Diagnostic) + 'a) -> DiagnosticSink<'a> {
+        DiagnosticSink { callbacks: Vec::new(), default_callback: Box::new(cb) }
+    }
+    pub fn on<D: Diagnostic, F: FnMut(&D) + 'a>(mut self, mut cb: F) -> DiagnosticSink<'a> {
+        let cb = move |diag: &dyn Diagnostic| match diag.downcast_ref::<D>() {
+            Some(d) => {
+                cb(d);
+                Ok(())
+            }
+            None => Err(()),
+        };
+        self.callbacks.push(Box::new(cb));
+        self
+    }
+    pub(crate) fn push(&mut self, d: impl Diagnostic) {
+        let d: &dyn Diagnostic = &d;
+        for cb in self.callbacks.iter_mut() {
+            match cb(d) {
+                Ok(()) => return,
+                Err(()) => (),
+            }
+        }
+        (self.default_callback)(d)
+    }
+}
+#[derive(Debug)]
+pub struct NoSuchField {
+    pub file: HirFileId,
+    pub field: AstPtr<ast::NamedField>,
+}
+impl Diagnostic for NoSuchField {
+    fn message(&self) -> String {
+        "no such field".to_string()
+    }
+    fn file(&self) -> HirFileId {
+        self.file
+    }
+    fn syntax_node_ptr(&self) -> SyntaxNodePtr {
+        self.field.into()
+    }
+    fn as_any(&self) -> &(Any + Send + 'static) {
+        self
+    }
+}
+#[derive(Debug)]
+pub struct UnresolvedModule {
+    pub file: HirFileId,
+    pub decl: AstPtr<ast::Module>,
+    pub candidate: RelativePathBuf,
+}
+impl Diagnostic for UnresolvedModule {
+    fn message(&self) -> String {
+        "unresolved module".to_string()
+    }
+    fn file(&self) -> HirFileId {
+        self.file
+    }
+    fn syntax_node_ptr(&self) -> SyntaxNodePtr {
+        self.decl.into()
+    }
+    fn as_any(&self) -> &(Any + Send + 'static) {
+        self
+    }
+}
diff --git a/crates/ra_hir/src/expr.rs b/crates/ra_hir/src/expr.rs
index c37fd0454..a85422955 100644
--- a/crates/ra_hir/src/expr.rs
+++ b/crates/ra_hir/src/expr.rs
@@ -5,7 +5,7 @@ use rustc_hash::FxHashMap;
 use ra_arena::{Arena, RawId, impl_arena_id, map::ArenaMap};
 use ra_syntax::{
-    SyntaxNodePtr, AstNode,
+    SyntaxNodePtr, AstPtr, AstNode,
    ast::{self, LoopBodyOwner, ArgListOwner, NameOwner, LiteralFlavor, TypeAscriptionOwner}
 };
@@ -54,6 +54,7 @@ pub struct BodySourceMap {
    expr_map_back: ArenaMap<ExprId, SyntaxNodePtr>,
    pat_map: FxHashMap<SyntaxNodePtr, PatId>,
    pat_map_back: ArenaMap<PatId, SyntaxNodePtr>,
+    field_map: FxHashMap<(ExprId, usize), AstPtr<ast::NamedField>>,
 }
 impl Body {
@@ -138,6 +139,10 @@ impl BodySourceMap {
    pub fn node_pat(&self, node: &ast::Pat) -> Option<PatId> {
        self.pat_map.get(&SyntaxNodePtr::new(node.syntax())).cloned()
    }
+    pub fn field_syntax(&self, expr: ExprId, field: usize) -> AstPtr<ast::NamedField> {
+        self.field_map[&(expr, field)].clone()
+    }
 }
 #[derive(Debug, Clone, Eq, PartialEq)]
@@ -629,8 +634,10 @@ impl ExprCollector {
            }
            ast::ExprKind::StructLit(e) => {
                let path = e.path().and_then(Path::from_ast);
+                let mut field_ptrs = Vec::new();
                let fields = if let Some(nfl) = e.named_field_list() {
                    nfl.fields()
+                        .inspect(|field| field_ptrs.push(AstPtr::new(*field)))
                        .map(|field| StructLitField {
                            name: field
                                .name_ref()
@@ -657,7 +664,11 @@ impl ExprCollector {
                    Vec::new()
                };
                let spread = e.spread().map(|s| self.collect_expr(s));
-                self.alloc_expr(Expr::StructLit { path, fields, spread }, syntax_ptr)
+                let res = self.alloc_expr(Expr::StructLit { path, fields, spread }, syntax_ptr);
+                for (i, ptr) in field_ptrs.into_iter().enumerate() {
+                    self.source_map.field_map.insert((res, i), ptr);
+                }
+                res
            }
            ast::ExprKind::FieldExpr(e) => {
                let expr = self.collect_expr_opt(e.expr());
diff --git a/crates/ra_hir/src/ids.rs b/crates/ra_hir/src/ids.rs
index 18401f865..eb9939df7 100644
--- a/crates/ra_hir/src/ids.rs
+++ b/crates/ra_hir/src/ids.rs
@@ -1,16 +1,15 @@
 use std::{
-    marker::PhantomData,
    hash::{Hash, Hasher},
    sync::Arc,
 };
 use ra_db::{LocationInterner, FileId};
-use ra_syntax::{TreeArc, SyntaxNode, SourceFile, AstNode, SyntaxNodePtr, ast};
+use ra_syntax::{TreeArc, SourceFile, AstNode, ast};
-use ra_arena::{Arena, RawId, ArenaId, impl_arena_id};
+use ra_arena::{RawId, ArenaId, impl_arena_id};
+use mbe::MacroRules;
 use crate::{
-    Module,
+    Module, DefDatabase, AstId, FileAstId,
-    DefDatabase,
 };
 #[derive(Debug, Default)]
@@ -22,7 +21,7 @@ pub struct HirInterner {
    consts: LocationInterner<ItemLoc<ast::ConstDef>, ConstId>,
    statics: LocationInterner<ItemLoc<ast::StaticDef>, StaticId>,
    traits: LocationInterner<ItemLoc<ast::TraitDef>, TraitId>,
-    types: LocationInterner<ItemLoc<ast::TypeAliasDef>, TypeId>,
+    types: LocationInterner<ItemLoc<ast::TypeAliasDef>, TypeAliasId>,
 }
 impl HirInterner {
@@ -68,7 +67,7 @@ impl HirFileId {
            HirFileIdRepr::File(file_id) => file_id,
            HirFileIdRepr::Macro(macro_call_id) => {
                let loc = macro_call_id.loc(db);
-                loc.source_item_id.file_id.original_file(db)
+                loc.ast_id.file_id().original_file(db)
            }
        }
    }
@@ -83,7 +82,10 @@ impl HirFileId {
        }
    }
-    pub(crate) fn hir_parse(db: &impl DefDatabase, file_id: HirFileId) -> TreeArc<SourceFile> {
+    pub(crate) fn hir_parse_query(
+        db: &impl DefDatabase,
+        file_id: HirFileId,
+    ) -> TreeArc<SourceFile> {
        match file_id.0 {
            HirFileIdRepr::File(file_id) => db.parse(file_id),
            HirFileIdRepr::Macro(macro_call_id) => {
@@ -96,14 +98,10 @@ impl HirFileId {
 fn parse_macro(db: &impl DefDatabase, macro_call_id: MacroCallId) -> Option<TreeArc<SourceFile>> {
    let loc = macro_call_id.loc(db);
-    let syntax = db.file_item(loc.source_item_id);
+    let macro_call = loc.ast_id.to_node(db);
-    let macro_call = ast::MacroCall::cast(&syntax).unwrap();
    let (macro_arg, _) = macro_call.token_tree().and_then(mbe::ast_to_token_tree)?;
-    let def_map = db.crate_def_map(loc.module.krate);
+    let macro_rules = db.macro_def(loc.def)?;
-    let (krate, macro_id) = def_map.resolve_macro(macro_call_id)?;
-    let def_map = db.crate_def_map(krate);
-    let macro_rules = &def_map[macro_id];
    let tt = macro_rules.expand(&macro_arg).ok()?;
    Some(mbe::token_tree_to_ast_item_list(&tt))
 }
@@ -126,6 +124,17 @@ impl From<MacroCallId> for HirFileId {
    }
 }
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct MacroDefId(pub(crate) AstId<ast::MacroCall>);
+pub(crate) fn macro_def_query(db: &impl DefDatabase, id: MacroDefId) -> Option<Arc<MacroRules>> {
+    let macro_call = id.0.to_node(db);
+    let arg = macro_call.token_tree()?;
+    let (tt, _) = mbe::ast_to_token_tree(arg)?;
+    let rules = MacroRules::parse(&tt).ok()?;
+    Some(Arc::new(rules))
+}
 /// `MacroCallId` identifies a particular macro invocation, like
 /// `println!("Hello, {}", world)`.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
@@ -134,8 +143,8 @@ impl_arena_id!(MacroCallId);
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct MacroCallLoc {
-    pub(crate) module: Module,
+    pub(crate) def: MacroDefId,
-    pub(crate) source_item_id: SourceItemId,
+    pub(crate) ast_id: AstId<ast::MacroCall>,
 }
 impl MacroCallId {
@@ -145,7 +154,6 @@ impl MacroCallId {
 }
 impl MacroCallLoc {
-    #[allow(unused)]
    pub(crate) fn id(&self, db: &impl AsRef<HirInterner>) -> MacroCallId {
        db.as_ref().macros.loc2id(&self)
    }
@@ -154,26 +162,25 @@ impl MacroCallLoc {
 #[derive(Debug)]
 pub struct ItemLoc<N: AstNode> {
    pub(crate) module: Module,
-    raw: SourceItemId,
+    ast_id: AstId<N>,
-    _ty: PhantomData<N>,
 }
 impl<N: AstNode> PartialEq for ItemLoc<N> {
    fn eq(&self, other: &Self) -> bool {
-        self.module == other.module && self.raw == other.raw
+        self.module == other.module && self.ast_id == other.ast_id
    }
 }
 impl<N: AstNode> Eq for ItemLoc<N> {}
 impl<N: AstNode> Hash for ItemLoc<N> {
    fn hash<H: Hasher>(&self, hasher: &mut H) {
        self.module.hash(hasher);
-        self.raw.hash(hasher);
+        self.ast_id.hash(hasher);
    }
 }
 impl<N: AstNode> Clone for ItemLoc<N> {
    fn clone(&self) -> ItemLoc<N> {
-        ItemLoc { module: self.module, raw: self.raw, _ty: PhantomData }
+        ItemLoc { module: self.module, ast_id: self.ast_id }
    }
 }
@@ -200,26 +207,19 @@ impl<'a, DB: DefDatabase> LocationCtx<&'a DB> {
 pub(crate) trait AstItemDef<N: AstNode>: ArenaId + Clone {
    fn interner(interner: &HirInterner) -> &LocationInterner<ItemLoc<N>, Self>;
    fn from_ast(ctx: LocationCtx<&impl DefDatabase>, ast: &N) -> Self {
-        let items = ctx.db.file_items(ctx.file_id);
+        let items = ctx.db.ast_id_map(ctx.file_id);
-        let item_id = items.id_of(ctx.file_id, ast.syntax());
+        let item_id = items.ast_id(ast);
-        Self::from_source_item_id_unchecked(ctx, item_id)
+        Self::from_ast_id(ctx, item_id)
    }
-    fn from_source_item_id_unchecked(
+    fn from_ast_id(ctx: LocationCtx<&impl DefDatabase>, ast_id: FileAstId<N>) -> Self {
-        ctx: LocationCtx<&impl DefDatabase>,
+        let loc = ItemLoc { module: ctx.module, ast_id: ast_id.with_file_id(ctx.file_id) };
-        item_id: SourceFileItemId,
-    ) -> Self {
-        let raw = SourceItemId { file_id: ctx.file_id, item_id };
-        let loc = ItemLoc { module: ctx.module, raw, _ty: PhantomData };
        Self::interner(ctx.db.as_ref()).loc2id(&loc)
    }
    fn source(self, db: &impl DefDatabase) -> (HirFileId, TreeArc<N>) {
        let int = Self::interner(db.as_ref());
        let loc = int.id2loc(self);
-        let syntax = db.file_item(loc.raw);
+        let ast = loc.ast_id.to_node(db);
-        let ast =
+        (loc.ast_id.file_id(), ast)
-            N::cast(&syntax).unwrap_or_else(|| panic!("invalid ItemLoc: {:?}", loc.raw)).to_owned();
-        (loc.raw.file_id, ast)
    }
    fn module(self, db: &impl DefDatabase) -> Module {
        let int = Self::interner(db.as_ref());
@@ -229,7 +229,7 @@ pub(crate) trait AstItemDef<N: AstNode>: ArenaId + Clone {
 }
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct FunctionId(RawId);
+pub(crate) struct FunctionId(RawId);
 impl_arena_id!(FunctionId);
 impl AstItemDef<ast::FnDef> for FunctionId {
    fn interner(interner: &HirInterner) -> &LocationInterner<ItemLoc<ast::FnDef>, Self> {
@@ -238,7 +238,7 @@ impl AstItemDef<ast::FnDef> for FunctionId {
 }
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct StructId(RawId);
+pub(crate) struct StructId(RawId);
 impl_arena_id!(StructId);
 impl AstItemDef<ast::StructDef> for StructId {
    fn interner(interner: &HirInterner) -> &LocationInterner<ItemLoc<ast::StructDef>, Self> {
@@ -247,7 +247,7 @@ impl AstItemDef<ast::StructDef> for StructId {
 }
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct EnumId(RawId);
+pub(crate) struct EnumId(RawId);
 impl_arena_id!(EnumId);
 impl AstItemDef<ast::EnumDef> for EnumId {
    fn interner(interner: &HirInterner) -> &LocationInterner<ItemLoc<ast::EnumDef>, Self> {
@@ -256,7 +256,7 @@ impl AstItemDef<ast::EnumDef> for EnumId {
 }
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct ConstId(RawId);
+pub(crate) struct ConstId(RawId);
 impl_arena_id!(ConstId);
 impl AstItemDef<ast::ConstDef> for ConstId {
    fn interner(interner: &HirInterner) -> &LocationInterner<ItemLoc<ast::ConstDef>, Self> {
@@ -265,7 +265,7 @@ impl AstItemDef<ast::ConstDef> for ConstId {
 }
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct StaticId(RawId);
+pub(crate) struct StaticId(RawId);
 impl_arena_id!(StaticId);
 impl AstItemDef<ast::StaticDef> for StaticId {
    fn interner(interner: &HirInterner) -> &LocationInterner<ItemLoc<ast::StaticDef>, Self> {
@@ -274,7 +274,7 @@ impl AstItemDef<ast::StaticDef> for StaticId {
 }
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct TraitId(RawId);
+pub(crate) struct TraitId(RawId);
 impl_arena_id!(TraitId);
 impl AstItemDef<ast::TraitDef> for TraitId {
    fn interner(interner: &HirInterner) -> &LocationInterner<ItemLoc<ast::TraitDef>, Self> {
@@ -283,117 +283,10 @@ impl AstItemDef<ast::TraitDef> for TraitId {
 }
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct TypeId(RawId);
+pub(crate) struct TypeAliasId(RawId);
-impl_arena_id!(TypeId);
+impl_arena_id!(TypeAliasId);
-impl AstItemDef<ast::TypeAliasDef> for TypeId {
+impl AstItemDef<ast::TypeAliasDef> for TypeAliasId {
    fn interner(interner: &HirInterner) -> &LocationInterner<ItemLoc<ast::TypeAliasDef>, Self> {
        &interner.types
    }
 }
-/// Identifier of item within a specific file. This is stable over reparses, so
-/// it's OK to use it as a salsa key/value.
-#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
-pub struct SourceFileItemId(RawId);
-impl_arena_id!(SourceFileItemId);
-impl SourceFileItemId {
-    pub(crate) fn with_file_id(self, file_id: HirFileId) -> SourceItemId {
-        SourceItemId { file_id, item_id: self }
-    }
-}
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct SourceItemId {
-    pub(crate) file_id: HirFileId,
-    pub(crate) item_id: SourceFileItemId,
-}
-/// Maps items' `SyntaxNode`s to `SourceFileItemId`s and back.
-#[derive(Debug, PartialEq, Eq)]
-pub struct SourceFileItems {
-    file_id: HirFileId,
-    arena: Arena<SourceFileItemId, SyntaxNodePtr>,
-}
-impl SourceFileItems {
-    pub(crate) fn file_items_query(
-        db: &impl DefDatabase,
-        file_id: HirFileId,
-    ) -> Arc<SourceFileItems> {
-        let source_file = db.hir_parse(file_id);
-        Arc::new(SourceFileItems::from_source_file(&source_file, file_id))
-    }
-    pub(crate) fn file_item_query(
-        db: &impl DefDatabase,
-        source_item_id: SourceItemId,
-    ) -> TreeArc<SyntaxNode> {
-        let source_file = db.hir_parse(source_item_id.file_id);
-        db.file_items(source_item_id.file_id)[source_item_id.item_id]
-            .to_node(&source_file)
-            .to_owned()
-    }
-    pub(crate) fn from_source_file(
-        source_file: &SourceFile,
-        file_id: HirFileId,
-    ) -> SourceFileItems {
-        let mut res = SourceFileItems { file_id, arena: Arena::default() };
-        // By walking the tree in bread-first order we make sure that parents
-        // get lower ids then children. That is, adding a new child does not
-        // change parent's id. This means that, say, adding a new function to a
-        // trait does not change ids of top-level items, which helps caching.
-        bfs(source_file.syntax(), |it| {
-            if let Some(module_item) = ast::ModuleItem::cast(it) {
-                res.alloc(module_item.syntax());
-            } else if let Some(macro_call) = ast::MacroCall::cast(it) {
-                res.alloc(macro_call.syntax());
-            }
-        });
-        res
-    }
-    fn alloc(&mut self, item: &SyntaxNode) -> SourceFileItemId {
-        self.arena.alloc(SyntaxNodePtr::new(item))
-    }
-    pub(crate) fn id_of(&self, file_id: HirFileId, item: &SyntaxNode) -> SourceFileItemId {
-        assert_eq!(
-            self.file_id, file_id,
-            "SourceFileItems: wrong file, expected {:?}, got {:?}",
-            self.file_id, file_id
-        );
-        self.id_of_unchecked(item)
-    }
-    pub(crate) fn id_of_unchecked(&self, item: &SyntaxNode) -> SourceFileItemId {
-        let ptr = SyntaxNodePtr::new(item);
-        if let Some((id, _)) = self.arena.iter().find(|(_id, i)| **i == ptr) {
-            return id;
-        }
-        panic!(
-            "Can't find {:?} in SourceFileItems:\n{:?}",
-            item,
-            self.arena.iter().map(|(_id, i)| i).collect::<Vec<_>>(),
-        );
-    }
-}
-impl std::ops::Index<SourceFileItemId> for SourceFileItems {
-    type Output = SyntaxNodePtr;
-    fn index(&self, idx: SourceFileItemId) -> &SyntaxNodePtr {
-        &self.arena[idx]
-    }
-}
-/// Walks the subtree in bfs order, calling `f` for each node.
-fn bfs(node: &SyntaxNode, mut f: impl FnMut(&SyntaxNode)) {
-    let mut curr_layer = vec![node];
-    let mut next_layer = vec![];
-    while !curr_layer.is_empty() {
-        curr_layer.drain(..).for_each(|node| {
-            next_layer.extend(node.children());
-            f(node);
-        });
-        std::mem::swap(&mut curr_layer, &mut next_layer);
-    }
-}
diff --git a/crates/ra_hir/src/lib.rs b/crates/ra_hir/src/lib.rs
index a89c916f8..7c603bbd3 100644
--- a/crates/ra_hir/src/lib.rs
+++ b/crates/ra_hir/src/lib.rs
@@ -23,10 +23,12 @@ pub mod mock;
 mod path;
 pub mod source_binder;
+mod source_id;
 mod ids;
 mod name;
 mod nameres;
 mod adt;
+mod traits;
 mod type_alias;
 mod type_ref;
 mod ty;
@@ -35,6 +37,7 @@ mod expr;
 mod generics;
 mod docs;
 mod resolve;
+pub mod diagnostics;
 mod code_model_api;
 mod code_model_impl;
@@ -45,13 +48,14 @@ mod marks;
 use crate::{
    db::{HirDatabase, DefDatabase},
    name::{AsName, KnownName},
-    ids::{SourceItemId, SourceFileItems},
+    source_id::{FileAstId, AstId},
 };
 pub use self::{
    path::{Path, PathKind},
    name::Name,
-    ids::{HirFileId, MacroCallId, MacroCallLoc, HirInterner},
+    source_id::{AstIdMap, ErasedFileAstId},
+    ids::{HirFileId, MacroDefId, MacroCallId, MacroCallLoc, HirInterner},
    nameres::{PerNs, Namespace},
    ty::{Ty, ApplicationTy, TypeCtor, Substs, display::HirDisplay},
    impl_block::{ImplBlock, ImplItem},
@@ -63,7 +67,7 @@ pub use self::{
 pub use self::code_model_api::{
    Crate, CrateDependency,
-    Module, ModuleDef, ModuleSource, Problem,
+    Module, ModuleDef, ModuleSource,
    Struct, Enum, EnumVariant,
    Function, FnSignature,
    StructField, FieldSource,
diff --git a/crates/ra_hir/src/mock.rs b/crates/ra_hir/src/mock.rs
index 10d4c1b8c..aeab6b180 100644
--- a/crates/ra_hir/src/mock.rs
+++ b/crates/ra_hir/src/mock.rs
@@ -9,7 +9,7 @@ use relative_path::RelativePathBuf;
 use test_utils::{parse_fixture, CURSOR_MARKER, extract_offset};
 use rustc_hash::FxHashMap;
-use crate::{db, HirInterner};
+use crate::{db, HirInterner, diagnostics::DiagnosticSink};
 pub const WORKSPACE: SourceRootId = SourceRootId(0);
@@ -70,6 +70,22 @@ impl MockDatabase {
        self.set_crate_graph(Arc::new(crate_graph))
    }
+    pub fn diagnostics(&self) -> String {
+        let mut buf = String::from("\n");
+        let mut files: Vec<FileId> = self.files.values().map(|&it| it).collect();
+        files.sort();
+        for file in files {
+            let module = crate::source_binder::module_from_file_id(self, file).unwrap();
+            module.diagnostics(
+                self,
+                &mut DiagnosticSink::new(|d| {
+                    buf += &format!("{:?}: {}\n", d.syntax_node(self).text(), d.message());
+                }),
+            )
+        }
+        buf
+    }
    fn from_fixture(fixture: &str) -> (MockDatabase, Option<FilePosition>) {
        let mut db = MockDatabase::default();
diff --git a/crates/ra_hir/src/nameres.rs b/crates/ra_hir/src/nameres.rs
index 5ac878c79..8adc6d368 100644
--- a/crates/ra_hir/src/nameres.rs
+++ b/crates/ra_hir/src/nameres.rs
@@ -59,12 +59,16 @@ use rustc_hash::FxHashMap;
 use ra_arena::{Arena, RawId, impl_arena_id};
 use ra_db::{FileId, Edition};
 use test_utils::tested_by;
+use ra_syntax::ast;
 use ra_prof::profile;
 use crate::{
-    ModuleDef, Name, Crate, Module, Problem,
+    ModuleDef, Name, Crate, Module,
-    DefDatabase, Path, PathKind, HirFileId,
+    DefDatabase, Path, PathKind, HirFileId, Trait,
-    ids::{SourceItemId, SourceFileItemId, MacroCallId},
+    ids::MacroDefId,
+    diagnostics::DiagnosticSink,
+    nameres::diagnostics::DefDiagnostic,
+    AstId,
 };
 pub(crate) use self::raw::{RawItems, ImportId, ImportSourceMap};
@@ -83,10 +87,8 @@ pub struct CrateDefMap {
    extern_prelude: FxHashMap<Name, ModuleDef>,
    root: CrateModuleId,
    modules: Arena<CrateModuleId, ModuleData>,
-    macros: Arena<CrateMacroId, mbe::MacroRules>,
+    public_macros: FxHashMap<Name, MacroDefId>,
-    public_macros: FxHashMap<Name, CrateMacroId>,
+    diagnostics: Vec<DefDiagnostic>,
-    macro_resolutions: FxHashMap<MacroCallId, (Crate, CrateMacroId)>,
-    problems: CrateDefMapProblems,
 }
 impl std::ops::Index<CrateModuleId> for CrateDefMap {
@@ -96,18 +98,6 @@ impl std::ops::Index<CrateModuleId> for CrateDefMap {
    }
 }
-impl std::ops::Index<CrateMacroId> for CrateDefMap {
-    type Output = mbe::MacroRules;
-    fn index(&self, id: CrateMacroId) -> &mbe::MacroRules {
-        &self.macros[id]
-    }
-}
-/// An ID of a macro, **local** to a specific crate
-#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
-pub(crate) struct CrateMacroId(RawId);
-impl_arena_id!(CrateMacroId);
 /// An ID of a module, **local** to a specific crate
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub(crate) struct CrateModuleId(RawId);
@@ -119,28 +109,13 @@ pub(crate) struct ModuleData {
    pub(crate) children: FxHashMap<Name, CrateModuleId>,
    pub(crate) scope: ModuleScope,
    /// None for root
-    pub(crate) declaration: Option<SourceItemId>,
+    pub(crate) declaration: Option<AstId<ast::Module>>,
    /// None for inline modules.
    ///
    /// Note that non-inline modules, by definition, live inside non-macro file.
    pub(crate) definition: Option<FileId>,
 }
-#[derive(Default, Debug, PartialEq, Eq)]
-pub(crate) struct CrateDefMapProblems {
-    problems: Vec<(SourceItemId, Problem)>,
-}
-impl CrateDefMapProblems {
-    fn add(&mut self, source_item_id: SourceItemId, problem: Problem) {
-        self.problems.push((source_item_id, problem))
-    }
-    pub(crate) fn iter<'a>(&'a self) -> impl Iterator<Item = (&'a SourceItemId, &'a Problem)> + 'a {
-        self.problems.iter().map(|(s, p)| (s, p))
-    }
-}
 #[derive(Debug, Default, PartialEq, Eq, Clone)]
 pub struct ModuleScope {
    items: FxHashMap<Name, Resolution>,
@@ -153,6 +128,12 @@ impl ModuleScope {
    pub fn get(&self, name: &Name) -> Option<&Resolution> {
        self.items.get(name)
    }
+    pub fn traits<'a>(&'a self) -> impl Iterator<Item = Trait> + 'a {
+        self.items.values().filter_map(|r| match r.def.take_types() {
+            Some(ModuleDef::Trait(t)) => Some(t),
+            _ => None,
+        })
+    }
 }
 #[derive(Debug, Clone, PartialEq, Eq, Default)]
@@ -210,10 +191,8 @@ impl CrateDefMap {
                prelude: None,
                root,
                modules,
-                macros: Arena::default(),
                public_macros: FxHashMap::default(),
-                macro_resolutions: FxHashMap::default(),
+                diagnostics: Vec::new(),
-                problems: CrateDefMapProblems::default(),
            }
        };
        let def_map = collector::collect_defs(db, def_map);
@@ -224,10 +203,6 @@ impl CrateDefMap {
        self.root
    }
-    pub(crate) fn problems(&self) -> &CrateDefMapProblems {
-        &self.problems
-    }
    pub(crate) fn mk_module(&self, module_id: CrateModuleId) -> Module {
        Module { krate: self.krate, module_id }
    }
@@ -240,19 +215,20 @@ impl CrateDefMap {
        &self.extern_prelude
    }
-    pub(crate) fn resolve_macro(
+    pub(crate) fn add_diagnostics(
        &self,
-        macro_call_id: MacroCallId,
+        db: &impl DefDatabase,
-    ) -> Option<(Crate, CrateMacroId)> {
+        module: CrateModuleId,
-        self.macro_resolutions.get(&macro_call_id).map(|&it| it)
+        sink: &mut DiagnosticSink,
+    ) {
+        self.diagnostics.iter().for_each(|it| it.add_to(db, module, sink))
    }
    pub(crate) fn find_module_by_source(
        &self,
        file_id: HirFileId,
-        decl_id: Option<SourceFileItemId>,
+        decl_id: Option<AstId<ast::Module>>,
    ) -> Option<CrateModuleId> {
-        let decl_id = decl_id.map(|it| it.with_file_id(file_id));
        let (module_id, _module_data) = self.modules.iter().find(|(_module_id, module_data)| {
            if decl_id.is_some() {
                module_data.declaration == decl_id
@@ -452,3 +428,46 @@ impl CrateDefMap {
        }
    }
 }
+mod diagnostics {
+    use relative_path::RelativePathBuf;
+    use ra_syntax::{AstPtr, ast};
+    use crate::{
+        AstId, DefDatabase,
+        nameres::CrateModuleId,
+        diagnostics::{DiagnosticSink, UnresolvedModule},
+};
+    #[derive(Debug, PartialEq, Eq)]
+    pub(super) enum DefDiagnostic {
+        UnresolvedModule {
+            module: CrateModuleId,
+            declaration: AstId<ast::Module>,
+            candidate: RelativePathBuf,
+        },
+    }
+    impl DefDiagnostic {
+        pub(super) fn add_to(
+            &self,
+            db: &impl DefDatabase,
+            target_module: CrateModuleId,
+            sink: &mut DiagnosticSink,
+        ) {
+            match self {
+                DefDiagnostic::UnresolvedModule { module, declaration, candidate } => {
+                    if *module != target_module {
+                        return;
+                    }
+                    let decl = declaration.to_node(db);
+                    sink.push(UnresolvedModule {
+                        file: declaration.file_id(),
+                        decl: AstPtr::new(&decl),
+                        candidate: candidate.clone(),
+                    })
+                }
+            }
+        }
+    }
+}
diff --git a/crates/ra_hir/src/nameres/collector.rs b/crates/ra_hir/src/nameres/collector.rs
index c5b73cfbe..39cadc94a 100644
--- a/crates/ra_hir/src/nameres/collector.rs
+++ b/crates/ra_hir/src/nameres/collector.rs
@@ -3,17 +3,22 @@ use rustc_hash::FxHashMap;
 use relative_path::RelativePathBuf;
 use test_utils::tested_by;
 use ra_db::FileId;
+use ra_syntax::ast;
 use crate::{
    Function, Module, Struct, Enum, Const, Static, Trait, TypeAlias,
-    DefDatabase, HirFileId, Name, Path, Problem, Crate,
+    DefDatabase, HirFileId, Name, Path,
    KnownName,
-    nameres::{Resolution, PerNs, ModuleDef, ReachedFixedPoint, ResolveMode, raw},
+    nameres::{
-    ids::{AstItemDef, LocationCtx, MacroCallLoc, SourceItemId, MacroCallId},
+        Resolution, PerNs, ModuleDef, ReachedFixedPoint, ResolveMode,
+        CrateDefMap, CrateModuleId, ModuleData,
+        diagnostics::DefDiagnostic,
+        raw,
+    },
+    ids::{AstItemDef, LocationCtx, MacroCallLoc, MacroCallId, MacroDefId},
+    AstId,
 };
-use super::{CrateDefMap, CrateModuleId, ModuleData, CrateMacroId};
 pub(super) fn collect_defs(db: &impl DefDatabase, mut def_map: CrateDefMap) -> CrateDefMap {
    // populate external prelude
    for dep in def_map.krate.dependencies(db) {
@@ -48,8 +53,8 @@ struct DefCollector<DB> {
    def_map: CrateDefMap,
    glob_imports: FxHashMap<CrateModuleId, Vec<(CrateModuleId, raw::ImportId)>>,
    unresolved_imports: Vec<(CrateModuleId, raw::ImportId, raw::ImportData)>,
-    unexpanded_macros: Vec<(CrateModuleId, MacroCallId, Path, tt::Subtree)>,
+    unexpanded_macros: Vec<(CrateModuleId, AstId<ast::MacroCall>, Path)>,
-    global_macro_scope: FxHashMap<Name, CrateMacroId>,
+    global_macro_scope: FxHashMap<Name, MacroDefId>,
 }
 impl<'a, DB> DefCollector<&'a DB>
@@ -59,7 +64,7 @@ where
    fn collect(&mut self) {
        let crate_graph = self.db.crate_graph();
        let file_id = crate_graph.crate_root(self.def_map.krate.crate_id());
-        let raw_items = self.db.raw_items(file_id);
+        let raw_items = self.db.raw_items(file_id.into());
        let module_id = self.def_map.root;
        self.def_map.modules[module_id].definition = Some(file_id);
        ModCollector {
@@ -90,14 +95,11 @@ where
        }
    }
-    fn define_macro(&mut self, name: Name, tt: &tt::Subtree, export: bool) {
+    fn define_macro(&mut self, name: Name, macro_id: MacroDefId, export: bool) {
-        if let Ok(rules) = mbe::MacroRules::parse(tt) {
+        if export {
-            let macro_id = self.def_map.macros.alloc(rules);
+            self.def_map.public_macros.insert(name.clone(), macro_id);
-            if export {
-                self.def_map.public_macros.insert(name.clone(), macro_id);
-            }
-            self.global_macro_scope.insert(name, macro_id);
        }
+        self.global_macro_scope.insert(name, macro_id);
    }
    fn resolve_imports(&mut self) -> ReachedFixedPoint {
@@ -293,7 +295,7 @@ where
        let mut macros = std::mem::replace(&mut self.unexpanded_macros, Vec::new());
        let mut resolved = Vec::new();
        let mut res = ReachedFixedPoint::Yes;
-        macros.retain(|(module_id, call_id, path, tt)| {
+        macros.retain(|(module_id, ast_id, path)| {
            if path.segments.len() != 2 {
                return true;
            }
@@ -309,47 +311,23 @@ where
            res = ReachedFixedPoint::No;
            let def_map = self.db.crate_def_map(krate);
            if let Some(macro_id) = def_map.public_macros.get(&path.segments[1].name).cloned() {
-                resolved.push((*module_id, *call_id, (krate, macro_id), tt.clone()));
+                let call_id = MacroCallLoc { def: macro_id, ast_id: *ast_id }.id(self.db);
+                resolved.push((*module_id, call_id));
            }
            false
        });
-        for (module_id, macro_call_id, macro_def_id, arg) in resolved {
+        for (module_id, macro_call_id) in resolved {
-            self.collect_macro_expansion(module_id, macro_call_id, macro_def_id, arg);
+            self.collect_macro_expansion(module_id, macro_call_id);
        }
        res
    }
-    fn collect_macro_expansion(
+    fn collect_macro_expansion(&mut self, module_id: CrateModuleId, macro_call_id: MacroCallId) {
-        &mut self,
+        let file_id: HirFileId = macro_call_id.into();
-        module_id: CrateModuleId,
+        let raw_items = self.db.raw_items(file_id);
-        macro_call_id: MacroCallId,
+        ModCollector { def_collector: &mut *self, file_id, module_id, raw_items: &raw_items }
-        macro_def_id: (Crate, CrateMacroId),
+            .collect(raw_items.items())
-        macro_arg: tt::Subtree,
-    ) {
-        let (macro_krate, macro_id) = macro_def_id;
-        let dm;
-        let rules = if macro_krate == self.def_map.krate {
-            &self.def_map[macro_id]
-        } else {
-            dm = self.db.crate_def_map(macro_krate);
-            &dm[macro_id]
-        };
-        if let Ok(expansion) = rules.expand(&macro_arg) {
-            self.def_map.macro_resolutions.insert(macro_call_id, macro_def_id);
-            // XXX: this **does not** go through a database, because we can't
-            // identify macro_call without adding the whole state of name resolution
-            // as a parameter to the query.
-            //
-            // So, we run the queries "manually" and we must ensure that
-            // `db.hir_parse(macro_call_id)` returns the same source_file.
-            let file_id: HirFileId = macro_call_id.into();
-            let source_file = mbe::token_tree_to_ast_item_list(&expansion);
-            let raw_items = raw::RawItems::from_source_file(&source_file, file_id);
-            ModCollector { def_collector: &mut *self, file_id, module_id, raw_items: &raw_items }
-                .collect(raw_items.items())
-        }
    }
    fn finish(self) -> CrateDefMap {
@@ -387,12 +365,9 @@ where
    fn collect_module(&mut self, module: &raw::ModuleData) {
        match module {
            // inline module, just recurse
-            raw::ModuleData::Definition { name, items, source_item_id } => {
+            raw::ModuleData::Definition { name, items, ast_id } => {
-                let module_id = self.push_child_module(
+                let module_id =
-                    name.clone(),
+                    self.push_child_module(name.clone(), ast_id.with_file_id(self.file_id), None);
-                    source_item_id.with_file_id(self.file_id),
-                    None,
-                );
                ModCollector {
                    def_collector: &mut *self.def_collector,
                    module_id,
@@ -402,28 +377,29 @@ where
                .collect(&*items);
            }
            // out of line module, resovle, parse and recurse
-            raw::ModuleData::Declaration { name, source_item_id } => {
+            raw::ModuleData::Declaration { name, ast_id } => {
-                let source_item_id = source_item_id.with_file_id(self.file_id);
+                let ast_id = ast_id.with_file_id(self.file_id);
                let is_root = self.def_collector.def_map.modules[self.module_id].parent.is_none();
-                let (file_ids, problem) =
+                match resolve_submodule(self.def_collector.db, self.file_id, name, is_root) {
-                    resolve_submodule(self.def_collector.db, self.file_id, name, is_root);
+                    Ok(file_id) => {
+                        let module_id = self.push_child_module(name.clone(), ast_id, Some(file_id));
-                if let Some(problem) = problem {
+                        let raw_items = self.def_collector.db.raw_items(file_id.into());
-                    self.def_collector.def_map.problems.add(source_item_id, problem)
+                        ModCollector {
-                }
+                            def_collector: &mut *self.def_collector,
+                            module_id,
-                if let Some(&file_id) = file_ids.first() {
+                            file_id: file_id.into(),
-                    let module_id =
+                            raw_items: &raw_items,
-                        self.push_child_module(name.clone(), source_item_id, Some(file_id));
+                        }
-                    let raw_items = self.def_collector.db.raw_items(file_id);
+                        .collect(raw_items.items())
-                    ModCollector {
-                        def_collector: &mut *self.def_collector,
-                        module_id,
-                        file_id: file_id.into(),
-                        raw_items: &raw_items,
                    }
-                    .collect(raw_items.items())
+                    Err(candidate) => self.def_collector.def_map.diagnostics.push(
-                }
+                        DefDiagnostic::UnresolvedModule {
+                            module: self.module_id,
+                            declaration: ast_id,
+                            candidate,
+                        },
+                    ),
+                };
            }
        }
    }
@@ -431,7 +407,7 @@ where
    fn push_child_module(
        &mut self,
        name: Name,
-        declaration: SourceItemId,
+        declaration: AstId<ast::Module>,
        definition: Option<FileId>,
    ) -> CrateModuleId {
        let modules = &mut self.def_collector.def_map.modules;
@@ -453,23 +429,24 @@ where
    fn define_def(&mut self, def: &raw::DefData) {
        let module = Module { krate: self.def_collector.def_map.krate, module_id: self.module_id };
        let ctx = LocationCtx::new(self.def_collector.db, module, self.file_id.into());
-        macro_rules! id {
-            () => {
+        macro_rules! def {
-                AstItemDef::from_source_item_id_unchecked(ctx, def.source_item_id)
+            ($kind:ident, $ast_id:ident) => {
+                $kind { id: AstItemDef::from_ast_id(ctx, $ast_id) }.into()
            };
        }
        let name = def.name.clone();
        let def: PerNs<ModuleDef> = match def.kind {
-            raw::DefKind::Function => PerNs::values(Function { id: id!() }.into()),
+            raw::DefKind::Function(ast_id) => PerNs::values(def!(Function, ast_id)),
-            raw::DefKind::Struct => {
+            raw::DefKind::Struct(ast_id) => {
-                let s = Struct { id: id!() }.into();
+                let s = def!(Struct, ast_id);
                PerNs::both(s, s)
            }
-            raw::DefKind::Enum => PerNs::types(Enum { id: id!() }.into()),
+            raw::DefKind::Enum(ast_id) => PerNs::types(def!(Enum, ast_id)),
-            raw::DefKind::Const => PerNs::values(Const { id: id!() }.into()),
+            raw::DefKind::Const(ast_id) => PerNs::values(def!(Const, ast_id)),
-            raw::DefKind::Static => PerNs::values(Static { id: id!() }.into()),
+            raw::DefKind::Static(ast_id) => PerNs::values(def!(Static, ast_id)),
-            raw::DefKind::Trait => PerNs::types(Trait { id: id!() }.into()),
+            raw::DefKind::Trait(ast_id) => PerNs::types(def!(Trait, ast_id)),
-            raw::DefKind::TypeAlias => PerNs::types(TypeAlias { id: id!() }.into()),
+            raw::DefKind::TypeAlias(ast_id) => PerNs::types(def!(TypeAlias, ast_id)),
        };
        let resolution = Resolution { def, import: None };
        self.def_collector.update(self.module_id, None, &[(name, resolution)])
@@ -479,39 +456,27 @@ where
        // Case 1: macro rules, define a macro in crate-global mutable scope
        if is_macro_rules(&mac.path) {
            if let Some(name) = &mac.name {
-                self.def_collector.define_macro(name.clone(), &mac.arg, mac.export)
+                let macro_id = MacroDefId(mac.ast_id.with_file_id(self.file_id));
+                self.def_collector.define_macro(name.clone(), macro_id, mac.export)
            }
            return;
        }
-        let source_item_id = SourceItemId { file_id: self.file_id, item_id: mac.source_item_id };
+        let ast_id = mac.ast_id.with_file_id(self.file_id);
-        let macro_call_id = MacroCallLoc {
-            module: Module { krate: self.def_collector.def_map.krate, module_id: self.module_id },
-            source_item_id,
-        }
-        .id(self.def_collector.db);
        // Case 2: try to expand macro_rules from this crate, triggering
        // recursive item collection.
        if let Some(&macro_id) =
            mac.path.as_ident().and_then(|name| self.def_collector.global_macro_scope.get(name))
        {
-            self.def_collector.collect_macro_expansion(
+            let macro_call_id = MacroCallLoc { def: macro_id, ast_id }.id(self.def_collector.db);
-                self.module_id,
-                macro_call_id,
+            self.def_collector.collect_macro_expansion(self.module_id, macro_call_id);
-                (self.def_collector.def_map.krate, macro_id),
-                mac.arg.clone(),
-            );
            return;
        }
        // Case 3: path to a macro from another crate, expand during name resolution
-        self.def_collector.unexpanded_macros.push((
+        self.def_collector.unexpanded_macros.push((self.module_id, ast_id, mac.path.clone()))
-            self.module_id,
-            macro_call_id,
-            mac.path.clone(),
-            mac.arg.clone(),
-        ))
    }
 }
@@ -524,7 +489,7 @@ fn resolve_submodule(
    file_id: HirFileId,
    name: &Name,
    is_root: bool,
-) -> (Vec<FileId>, Option<Problem>) {
+) -> Result<FileId, RelativePathBuf> {
    // FIXME: handle submodules of inline modules properly
    let file_id = file_id.original_file(db);
    let source_root_id = db.file_source_root(file_id);
@@ -545,17 +510,10 @@ fn resolve_submodule(
        candidates.push(file_dir_mod.clone());
    };
    let sr = db.source_root(source_root_id);
-    let points_to = candidates
+    let mut points_to = candidates.into_iter().filter_map(|path| sr.files.get(&path)).map(|&it| it);
-        .into_iter()
+    // FIXME: handle ambiguity
-        .filter_map(|path| sr.files.get(&path))
+    match points_to.next() {
-        .map(|&it| it)
+        Some(file_id) => Ok(file_id),
-        .collect::<Vec<_>>();
+        None => Err(if is_dir_owner { file_mod } else { file_dir_mod }),
-    let problem = if points_to.is_empty() {
+    }
-        Some(Problem::UnresolvedModule {
-            candidate: if is_dir_owner { file_mod } else { file_dir_mod },
-        })
-    } else {
-        None
-    };
-    (points_to, problem)
 }
diff --git a/crates/ra_hir/src/nameres/raw.rs b/crates/ra_hir/src/nameres/raw.rs
index f8ba398ec..0936229ac 100644
--- a/crates/ra_hir/src/nameres/raw.rs
+++ b/crates/ra_hir/src/nameres/raw.rs
@@ -4,7 +4,6 @@ use std::{
 };
 use test_utils::tested_by;
-use ra_db::FileId;
 use ra_arena::{Arena, impl_arena_id, RawId, map::ArenaMap};
 use ra_syntax::{
    AstNode, SourceFile, AstPtr, TreeArc,
@@ -13,9 +12,13 @@ use ra_syntax::{
 use crate::{
    DefDatabase, Name, AsName, Path, HirFileId, ModuleSource,
-    ids::{SourceFileItemId, SourceFileItems},
+    AstIdMap, FileAstId,
 };
+/// `RawItems` is a set of top-level items in a file (except for impls).
+///
+/// It is the input to name resolution algorithm. `RawItems` are not invalidated
+/// on most edits.
 #[derive(Debug, Default, PartialEq, Eq)]
 pub struct RawItems {
    modules: Arena<Module, ModuleData>,
@@ -32,11 +35,11 @@ pub struct ImportSourceMap {
 }
 impl ImportSourceMap {
-    pub(crate) fn insert(&mut self, import: ImportId, segment: &ast::PathSegment) {
+    fn insert(&mut self, import: ImportId, segment: &ast::PathSegment) {
        self.map.insert(import, AstPtr::new(segment))
    }
-    pub fn get(&self, source: &ModuleSource, import: ImportId) -> TreeArc<ast::PathSegment> {
+    pub(crate) fn get(&self, source: &ModuleSource, import: ImportId) -> TreeArc<ast::PathSegment> {
        let file = match source {
            ModuleSource::SourceFile(file) => &*file,
            ModuleSource::Module(m) => m.syntax().ancestors().find_map(SourceFile::cast).unwrap(),
@@ -47,40 +50,27 @@ impl ImportSourceMap {
 }
 impl RawItems {
-    pub(crate) fn raw_items_query(db: &impl DefDatabase, file_id: FileId) -> Arc<RawItems> {
+    pub(crate) fn raw_items_query(db: &impl DefDatabase, file_id: HirFileId) -> Arc<RawItems> {
        db.raw_items_with_source_map(file_id).0
    }
    pub(crate) fn raw_items_with_source_map_query(
        db: &impl DefDatabase,
-        file_id: FileId,
+        file_id: HirFileId,
    ) -> (Arc<RawItems>, Arc<ImportSourceMap>) {
        let mut collector = RawItemsCollector {
            raw_items: RawItems::default(),
-            source_file_items: db.file_items(file_id.into()),
+            source_ast_id_map: db.ast_id_map(file_id.into()),
            source_map: ImportSourceMap::default(),
        };
-        let source_file = db.parse(file_id);
+        let source_file = db.hir_parse(file_id);
        collector.process_module(None, &*source_file);
        (Arc::new(collector.raw_items), Arc::new(collector.source_map))
    }
-    pub(crate) fn items(&self) -> &[RawItem] {
+    pub(super) fn items(&self) -> &[RawItem] {
        &self.items
    }
-    // We can't use queries during name resolution for fear of cycles, so this
-    // is a query-less variant of the above function.
-    pub(crate) fn from_source_file(source_file: &SourceFile, file_id: HirFileId) -> RawItems {
-        let source_file_items = SourceFileItems::from_source_file(source_file, file_id);
-        let mut collector = RawItemsCollector {
-            raw_items: RawItems::default(),
-            source_file_items: Arc::new(source_file_items),
-            source_map: ImportSourceMap::default(),
-        };
-        collector.process_module(None, &*source_file);
-        collector.raw_items
-    }
 }
 impl Index<Module> for RawItems {
@@ -112,7 +102,7 @@ impl Index<Macro> for RawItems {
 }
 #[derive(Debug, PartialEq, Eq, Clone, Copy)]
-pub(crate) enum RawItem {
+pub(super) enum RawItem {
    Module(Module),
    Import(ImportId),
    Def(Def),
@@ -120,13 +110,13 @@ pub(crate) enum RawItem {
 }
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub(crate) struct Module(RawId);
+pub(super) struct Module(RawId);
 impl_arena_id!(Module);
 #[derive(Debug, PartialEq, Eq)]
-pub(crate) enum ModuleData {
+pub(super) enum ModuleData {
-    Declaration { name: Name, source_item_id: SourceFileItemId },
+    Declaration { name: Name, ast_id: FileAstId<ast::Module> },
-    Definition { name: Name, source_item_id: SourceFileItemId, items: Vec<RawItem> },
+    Definition { name: Name, ast_id: FileAstId<ast::Module>, items: Vec<RawItem> },
 }
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
@@ -135,51 +125,49 @@ impl_arena_id!(ImportId);
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct ImportData {
-    pub(crate) path: Path,
+    pub(super) path: Path,
-    pub(crate) alias: Option<Name>,
+    pub(super) alias: Option<Name>,
-    pub(crate) is_glob: bool,
+    pub(super) is_glob: bool,
-    pub(crate) is_prelude: bool,
+    pub(super) is_prelude: bool,
-    pub(crate) is_extern_crate: bool,
+    pub(super) is_extern_crate: bool,
 }
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub(crate) struct Def(RawId);
+pub(super) struct Def(RawId);
 impl_arena_id!(Def);
 #[derive(Debug, PartialEq, Eq)]
-pub(crate) struct DefData {
+pub(super) struct DefData {
-    pub(crate) source_item_id: SourceFileItemId,
+    pub(super) name: Name,
-    pub(crate) name: Name,
+    pub(super) kind: DefKind,
-    pub(crate) kind: DefKind,
 }
 #[derive(Debug, PartialEq, Eq, Clone, Copy)]
-pub(crate) enum DefKind {
+pub(super) enum DefKind {
-    Function,
+    Function(FileAstId<ast::FnDef>),
-    Struct,
+    Struct(FileAstId<ast::StructDef>),
-    Enum,
+    Enum(FileAstId<ast::EnumDef>),
-    Const,
+    Const(FileAstId<ast::ConstDef>),
-    Static,
+    Static(FileAstId<ast::StaticDef>),
-    Trait,
+    Trait(FileAstId<ast::TraitDef>),
-    TypeAlias,
+    TypeAlias(FileAstId<ast::TypeAliasDef>),
 }
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub(crate) struct Macro(RawId);
+pub(super) struct Macro(RawId);
 impl_arena_id!(Macro);
 #[derive(Debug, PartialEq, Eq)]
-pub(crate) struct MacroData {
+pub(super) struct MacroData {
-    pub(crate) source_item_id: SourceFileItemId,
+    pub(super) ast_id: FileAstId<ast::MacroCall>,
-    pub(crate) path: Path,
+    pub(super) path: Path,
-    pub(crate) name: Option<Name>,
+    pub(super) name: Option<Name>,
-    pub(crate) arg: tt::Subtree,
+    pub(super) export: bool,
-    pub(crate) export: bool,
 }
 struct RawItemsCollector {
    raw_items: RawItems,
-    source_file_items: Arc<SourceFileItems>,
+    source_ast_id_map: Arc<AstIdMap>,
    source_map: ImportSourceMap,
 }
@@ -211,18 +199,31 @@ impl RawItemsCollector {
                // impls don't participate in name resolution
                return;
            }
-            ast::ModuleItemKind::StructDef(it) => (DefKind::Struct, it.name()),
+            ast::ModuleItemKind::StructDef(it) => {
-            ast::ModuleItemKind::EnumDef(it) => (DefKind::Enum, it.name()),
+                (DefKind::Struct(self.source_ast_id_map.ast_id(it)), it.name())
-            ast::ModuleItemKind::FnDef(it) => (DefKind::Function, it.name()),
+            }
-            ast::ModuleItemKind::TraitDef(it) => (DefKind::Trait, it.name()),
+            ast::ModuleItemKind::EnumDef(it) => {
-            ast::ModuleItemKind::TypeAliasDef(it) => (DefKind::TypeAlias, it.name()),
+                (DefKind::Enum(self.source_ast_id_map.ast_id(it)), it.name())
-            ast::ModuleItemKind::ConstDef(it) => (DefKind::Const, it.name()),
+            }
-            ast::ModuleItemKind::StaticDef(it) => (DefKind::Static, it.name()),
+            ast::ModuleItemKind::FnDef(it) => {
+                (DefKind::Function(self.source_ast_id_map.ast_id(it)), it.name())
+            }
+            ast::ModuleItemKind::TraitDef(it) => {
+                (DefKind::Trait(self.source_ast_id_map.ast_id(it)), it.name())
+            }
+            ast::ModuleItemKind::TypeAliasDef(it) => {
+                (DefKind::TypeAlias(self.source_ast_id_map.ast_id(it)), it.name())
+            }
+            ast::ModuleItemKind::ConstDef(it) => {
+                (DefKind::Const(self.source_ast_id_map.ast_id(it)), it.name())
+            }
+            ast::ModuleItemKind::StaticDef(it) => {
+                (DefKind::Static(self.source_ast_id_map.ast_id(it)), it.name())
+            }
        };
        if let Some(name) = name {
            let name = name.as_name();
-            let source_item_id = self.source_file_items.id_of_unchecked(item.syntax());
+            let def = self.raw_items.defs.alloc(DefData { name, kind });
-            let def = self.raw_items.defs.alloc(DefData { name, kind, source_item_id });
            self.push_item(current_module, RawItem::Def(def))
        }
    }
@@ -232,10 +233,9 @@ impl RawItemsCollector {
            Some(it) => it.as_name(),
            None => return,
        };
-        let source_item_id = self.source_file_items.id_of_unchecked(module.syntax());
+        let ast_id = self.source_ast_id_map.ast_id(module);
        if module.has_semi() {
-            let item =
+            let item = self.raw_items.modules.alloc(ModuleData::Declaration { name, ast_id });
-                self.raw_items.modules.alloc(ModuleData::Declaration { name, source_item_id });
            self.push_item(current_module, RawItem::Module(item));
            return;
        }
@@ -243,7 +243,7 @@ impl RawItemsCollector {
        if let Some(item_list) = module.item_list() {
            let item = self.raw_items.modules.alloc(ModuleData::Definition {
                name,
-                source_item_id,
+                ast_id,
                items: Vec::new(),
            });
            self.process_module(Some(item), item_list);
@@ -291,18 +291,15 @@ impl RawItemsCollector {
    }
    fn add_macro(&mut self, current_module: Option<Module>, m: &ast::MacroCall) {
-        let (path, arg) = match (
+        let path = match m.path().and_then(Path::from_ast) {
-            m.path().and_then(Path::from_ast),
+            Some(it) => it,
-            m.token_tree().and_then(mbe::ast_to_token_tree),
-        ) {
-            (Some(path), Some((token_tree, _token_map))) => (path, token_tree),
            _ => return,
        };
        let name = m.name().map(|it| it.as_name());
-        let source_item_id = self.source_file_items.id_of_unchecked(m.syntax());
+        let ast_id = self.source_ast_id_map.ast_id(m);
        let export = m.has_atom_attr("macro_export");
-        let m = self.raw_items.macros.alloc(MacroData { source_item_id, path, arg, name, export });
+        let m = self.raw_items.macros.alloc(MacroData { ast_id, path, name, export });
        self.push_item(current_module, RawItem::Macro(m));
    }
diff --git a/crates/ra_hir/src/nameres/tests.rs b/crates/ra_hir/src/nameres/tests.rs
index ac9b88520..572bd1bf7 100644
--- a/crates/ra_hir/src/nameres/tests.rs
+++ b/crates/ra_hir/src/nameres/tests.rs
@@ -552,3 +552,22 @@ foo: v
 "###
    );
 }
+#[test]
+fn unresolved_module_diagnostics() {
+    let diagnostics = MockDatabase::with_files(
+        r"
+        //- /lib.rs
+        mod foo;
+        mod bar;
+        mod baz {}
+        //- /foo.rs
+        ",
+    )
+    .diagnostics();
+    assert_snapshot_matches!(diagnostics, @r###"
+"mod bar;": unresolved module
+"###
+    );
+}
diff --git a/crates/ra_hir/src/nameres/tests/incremental.rs b/crates/ra_hir/src/nameres/tests/incremental.rs
index 698781923..001f76ac3 100644
--- a/crates/ra_hir/src/nameres/tests/incremental.rs
+++ b/crates/ra_hir/src/nameres/tests/incremental.rs
@@ -90,34 +90,44 @@ fn adding_inner_items_should_not_invalidate_def_map() {
    );
 }
-// It would be awesome to make this work, but it's unclear how
 #[test]
-#[ignore]
+fn typing_inside_a_macro_should_not_invalidate_def_map() {
-fn typing_inside_a_function_inside_a_macro_should_not_invalidate_def_map() {
+    let (mut db, pos) = MockDatabase::with_position(
-    check_def_map_is_not_recomputed(
        "
        //- /lib.rs
+        macro_rules! m {
+            ($ident:ident) => {
+                fn f() {
+                    $ident + $ident;
+                };
+            }
+        }
        mod foo;
-        use crate::foo::bar::Baz;
        //- /foo/mod.rs
        pub mod bar;
        //- /foo/bar.rs
        <|>
-        salsa::query_group! {
+        m!(X);
-            trait Baz {
-                fn foo() -> i32 { 1 + 1 }
-            }
-        }
-        ",
-        "
-        salsa::query_group! {
-            trait Baz {
-                fn foo() -> i32 { 92 }
-            }
-        }
        ",
    );
+    {
+        let events = db.log_executed(|| {
+            let module = crate::source_binder::module_from_file_id(&db, pos.file_id).unwrap();
+            let decls = module.declarations(&db);
+            assert_eq!(decls.len(), 1);
+        });
+        assert!(format!("{:?}", events).contains("crate_def_map"), "{:#?}", events)
+    }
+    db.set_file_text(pos.file_id, Arc::new("m!(Y);".to_string()));
+    {
+        let events = db.log_executed(|| {
+            let module = crate::source_binder::module_from_file_id(&db, pos.file_id).unwrap();
+            let decls = module.declarations(&db);
+            assert_eq!(decls.len(), 1);
+        });
+        assert!(!format!("{:?}", events).contains("crate_def_map"), "{:#?}", events)
+    }
 }
diff --git a/crates/ra_hir/src/resolve.rs b/crates/ra_hir/src/resolve.rs
index f28154517..2609585b1 100644
--- a/crates/ra_hir/src/resolve.rs
+++ b/crates/ra_hir/src/resolve.rs
@@ -11,7 +11,7 @@ use crate::{
    generics::GenericParams,
    expr::{scope::{ExprScopes, ScopeId}, PatId, Body},
    impl_block::ImplBlock,
-    path::Path,
+    path::Path, Trait
 };
 #[derive(Debug, Clone, Default)]
@@ -175,6 +175,21 @@ impl Resolver {
        names
    }
+    pub(crate) fn traits_in_scope<'a>(&'a self) -> impl Iterator<Item = Trait> + 'a {
+        // FIXME prelude
+        self.scopes
+            .iter()
+            .rev()
+            .flat_map(|scope| {
+                match scope {
+                    Scope::ModuleScope(m) => Some(m.crate_def_map[m.module_id].scope.traits()),
+                    _ => None,
+                }
+                .into_iter()
+            })
+            .flatten()
+    }
    fn module(&self) -> Option<(&CrateDefMap, CrateModuleId)> {
        self.scopes.iter().rev().find_map(|scope| match scope {
            Scope::ModuleScope(m) => Some((&*m.crate_def_map, m.module_id)),
diff --git a/crates/ra_hir/src/source_binder.rs b/crates/ra_hir/src/source_binder.rs
index 3645b73b4..9dae4c3d1 100644
--- a/crates/ra_hir/src/source_binder.rs
+++ b/crates/ra_hir/src/source_binder.rs
@@ -15,8 +15,8 @@ use ra_syntax::{
 use crate::{
    HirDatabase, Function, Struct, Enum,
    AsName, Module, HirFileId, Crate, Trait, Resolver,
-    ids::{LocationCtx, SourceFileItemId},
+    ids::LocationCtx,
-    expr
+    expr, AstId
 };
 /// Locates the module by `FileId`. Picks topmost module in the file.
@@ -54,8 +54,8 @@ fn module_from_inline(
 ) -> Option<Module> {
    assert!(!module.has_semi());
    let file_id = file_id.into();
-    let file_items = db.file_items(file_id);
+    let ast_id_map = db.ast_id_map(file_id);
-    let item_id = file_items.id_of(file_id, module.syntax());
+    let item_id = ast_id_map.ast_id(module).with_file_id(file_id);
    module_from_source(db, file_id, Some(item_id))
 }
@@ -75,7 +75,7 @@ pub fn module_from_child_node(
 fn module_from_source(
    db: &impl HirDatabase,
    file_id: HirFileId,
-    decl_id: Option<SourceFileItemId>,
+    decl_id: Option<AstId<ast::Module>>,
 ) -> Option<Module> {
    let source_root_id = db.file_source_root(file_id.as_original_file());
    db.source_root_crates(source_root_id).iter().map(|&crate_id| Crate { crate_id }).find_map(
diff --git a/crates/ra_hir/src/source_id.rs b/crates/ra_hir/src/source_id.rs
new file mode 100644
index 000000000..0a8fb6d32
--- /dev/null
+++ b/crates/ra_hir/src/source_id.rs
@@ -0,0 +1,150 @@
+use std::{marker::PhantomData, sync::Arc, hash::{Hash, Hasher}};
+use ra_arena::{Arena, RawId, impl_arena_id};
+use ra_syntax::{SyntaxNodePtr, TreeArc, SyntaxNode, SourceFile, AstNode, ast};
+use crate::{HirFileId, DefDatabase};
+/// `AstId` points to an AST node in any file.
+///
+/// It is stable across reparses, and can be used as salsa key/value.
+#[derive(Debug)]
+pub(crate) struct AstId<N: AstNode> {
+    file_id: HirFileId,
+    file_ast_id: FileAstId<N>,
+}
+impl<N: AstNode> Clone for AstId<N> {
+    fn clone(&self) -> AstId<N> {
+        *self
+    }
+}
+impl<N: AstNode> Copy for AstId<N> {}
+impl<N: AstNode> PartialEq for AstId<N> {
+    fn eq(&self, other: &Self) -> bool {
+        (self.file_id, self.file_ast_id) == (other.file_id, other.file_ast_id)
+    }
+}
+impl<N: AstNode> Eq for AstId<N> {}
+impl<N: AstNode> Hash for AstId<N> {
+    fn hash<H: Hasher>(&self, hasher: &mut H) {
+        (self.file_id, self.file_ast_id).hash(hasher);
+    }
+}
+impl<N: AstNode> AstId<N> {
+    pub(crate) fn file_id(&self) -> HirFileId {
+        self.file_id
+    }
+    pub(crate) fn to_node(&self, db: &impl DefDatabase) -> TreeArc<N> {
+        let syntax_node = db.ast_id_to_node(self.file_id, self.file_ast_id.raw);
+        N::cast(&syntax_node).unwrap().to_owned()
+    }
+}
+/// `AstId` points to an AST node in a specific file.
+#[derive(Debug)]
+pub(crate) struct FileAstId<N: AstNode> {
+    raw: ErasedFileAstId,
+    _ty: PhantomData<N>,
+}
+impl<N: AstNode> Clone for FileAstId<N> {
+    fn clone(&self) -> FileAstId<N> {
+        *self
+    }
+}
+impl<N: AstNode> Copy for FileAstId<N> {}
+impl<N: AstNode> PartialEq for FileAstId<N> {
+    fn eq(&self, other: &Self) -> bool {
+        self.raw == other.raw
+    }
+}
+impl<N: AstNode> Eq for FileAstId<N> {}
+impl<N: AstNode> Hash for FileAstId<N> {
+    fn hash<H: Hasher>(&self, hasher: &mut H) {
+        self.raw.hash(hasher);
+    }
+}
+impl<N: AstNode> FileAstId<N> {
+    pub(crate) fn with_file_id(self, file_id: HirFileId) -> AstId<N> {
+        AstId { file_id, file_ast_id: self }
+    }
+}
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct ErasedFileAstId(RawId);
+impl_arena_id!(ErasedFileAstId);
+/// Maps items' `SyntaxNode`s to `ErasedFileAstId`s and back.
+#[derive(Debug, PartialEq, Eq)]
+pub struct AstIdMap {
+    arena: Arena<ErasedFileAstId, SyntaxNodePtr>,
+}
+impl AstIdMap {
+    pub(crate) fn ast_id_map_query(db: &impl DefDatabase, file_id: HirFileId) -> Arc<AstIdMap> {
+        let source_file = db.hir_parse(file_id);
+        Arc::new(AstIdMap::from_source_file(&source_file))
+    }
+    pub(crate) fn file_item_query(
+        db: &impl DefDatabase,
+        file_id: HirFileId,
+        ast_id: ErasedFileAstId,
+    ) -> TreeArc<SyntaxNode> {
+        let source_file = db.hir_parse(file_id);
+        db.ast_id_map(file_id).arena[ast_id].to_node(&source_file).to_owned()
+    }
+    pub(crate) fn ast_id<N: AstNode>(&self, item: &N) -> FileAstId<N> {
+        let ptr = SyntaxNodePtr::new(item.syntax());
+        let raw = match self.arena.iter().find(|(_id, i)| **i == ptr) {
+            Some((it, _)) => it,
+            None => panic!(
+                "Can't find {:?} in AstIdMap:\n{:?}",
+                item.syntax(),
+                self.arena.iter().map(|(_id, i)| i).collect::<Vec<_>>(),
+            ),
+        };
+        FileAstId { raw, _ty: PhantomData }
+    }
+    fn from_source_file(source_file: &SourceFile) -> AstIdMap {
+        let mut res = AstIdMap { arena: Arena::default() };
+        // By walking the tree in bread-first order we make sure that parents
+        // get lower ids then children. That is, adding a new child does not
+        // change parent's id. This means that, say, adding a new function to a
+        // trait does not change ids of top-level items, which helps caching.
+        bfs(source_file.syntax(), |it| {
+            if let Some(module_item) = ast::ModuleItem::cast(it) {
+                res.alloc(module_item.syntax());
+            } else if let Some(macro_call) = ast::MacroCall::cast(it) {
+                res.alloc(macro_call.syntax());
+            }
+        });
+        res
+    }
+    fn alloc(&mut self, item: &SyntaxNode) -> ErasedFileAstId {
+        self.arena.alloc(SyntaxNodePtr::new(item))
+    }
+}
+/// Walks the subtree in bfs order, calling `f` for each node.
+fn bfs(node: &SyntaxNode, mut f: impl FnMut(&SyntaxNode)) {
+    let mut curr_layer = vec![node];
+    let mut next_layer = vec![];
+    while !curr_layer.is_empty() {
+        curr_layer.drain(..).for_each(|node| {
+            next_layer.extend(node.children());
+            f(node);
+        });
+        std::mem::swap(&mut curr_layer, &mut next_layer);
+    }
+}
diff --git a/crates/ra_hir/src/traits.rs b/crates/ra_hir/src/traits.rs
new file mode 100644
index 000000000..725bdd5cb
--- /dev/null
+++ b/crates/ra_hir/src/traits.rs
@@ -0,0 +1,52 @@
+//! HIR for trait definitions.
+use std::sync::Arc;
+use ra_syntax::ast::{self, NameOwner};
+use crate::{Function, Const, TypeAlias, Name, DefDatabase, Trait, ids::LocationCtx, name::AsName};
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct TraitData {
+    name: Option<Name>,
+    items: Vec<TraitItem>,
+}
+impl TraitData {
+    pub(crate) fn trait_data_query(db: &impl DefDatabase, tr: Trait) -> Arc<TraitData> {
+        let (file_id, node) = tr.source(db);
+        let name = node.name().map(|n| n.as_name());
+        let module = tr.module(db);
+        let ctx = LocationCtx::new(db, module, file_id);
+        let items = if let Some(item_list) = node.item_list() {
+            item_list
+                .impl_items()
+                .map(|item_node| match item_node.kind() {
+                    ast::ImplItemKind::FnDef(it) => Function { id: ctx.to_def(it) }.into(),
+                    ast::ImplItemKind::ConstDef(it) => Const { id: ctx.to_def(it) }.into(),
+                    ast::ImplItemKind::TypeAliasDef(it) => TypeAlias { id: ctx.to_def(it) }.into(),
+                })
+                .collect()
+        } else {
+            Vec::new()
+        };
+        Arc::new(TraitData { name, items })
+    }
+    pub(crate) fn name(&self) -> &Option<Name> {
+        &self.name
+    }
+    pub(crate) fn items(&self) -> &[TraitItem] {
+        &self.items
+    }
+}
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub enum TraitItem {
+    Function(Function),
+    Const(Const),
+    TypeAlias(TypeAlias),
+    // Existential
+}
+impl_froms!(TraitItem: Function, Const, TypeAlias);
diff --git a/crates/ra_hir/src/ty.rs b/crates/ra_hir/src/ty.rs
index 7d25ade47..d42c61e9d 100644
--- a/crates/ra_hir/src/ty.rs
+++ b/crates/ra_hir/src/ty.rs
@@ -14,7 +14,7 @@ pub(crate) mod display;
 use std::sync::Arc;
 use std::{fmt, mem};
-use crate::{Name, AdtDef, type_ref::Mutability, db::HirDatabase};
+use crate::{Name, AdtDef, type_ref::Mutability, db::HirDatabase, Trait};
 pub(crate) use lower::{TypableDef, CallableDef, type_for_def, type_for_field, callable_item_sig};
 pub(crate) use infer::{infer, InferenceResult, InferTy};
@@ -91,7 +91,7 @@ pub enum TypeCtor {
 /// A nominal type with (maybe 0) type parameters. This might be a primitive
 /// type like `bool`, a struct, tuple, function pointer, reference or
 /// several other things.
-#[derive(Clone, PartialEq, Eq, Debug)]
+#[derive(Clone, PartialEq, Eq, Debug, Hash)]
 pub struct ApplicationTy {
    pub ctor: TypeCtor,
    pub parameters: Substs,
@@ -103,7 +103,7 @@ pub struct ApplicationTy {
 /// the same thing (but in a different way).
 ///
 /// This should be cheap to clone.
-#[derive(Clone, PartialEq, Eq, Debug)]
+#[derive(Clone, PartialEq, Eq, Debug, Hash)]
 pub enum Ty {
    /// A nominal type with (maybe 0) type parameters. This might be a primitive
    /// type like `bool`, a struct, tuple, function pointer, reference or
@@ -132,7 +132,7 @@ pub enum Ty {
 }
 /// A list of substitutions for generic parameters.
-#[derive(Clone, PartialEq, Eq, Debug)]
+#[derive(Clone, PartialEq, Eq, Debug, Hash)]
 pub struct Substs(Arc<[Ty]>);
 impl Substs {
@@ -169,6 +169,21 @@ impl Substs {
    }
 }
+/// A trait with type parameters. This includes the `Self`, so this represents a concrete type implementing the trait.
+/// Name to be bikeshedded: TraitBound? TraitImplements?
+#[derive(Clone, PartialEq, Eq, Debug, Hash)]
+pub struct TraitRef {
+    /// FIXME name?
+    trait_: Trait,
+    substs: Substs,
+}
+impl TraitRef {
+    pub fn self_ty(&self) -> &Ty {
+        &self.substs.0[0]
+    }
+}
 /// A function signature as seen by type inference: Several parameter types and
 /// one return type.
 #[derive(Clone, PartialEq, Eq, Debug)]
diff --git a/crates/ra_hir/src/ty/infer.rs b/crates/ra_hir/src/ty/infer.rs
index cff7e7481..573115321 100644
--- a/crates/ra_hir/src/ty/infer.rs
+++ b/crates/ra_hir/src/ty/infer.rs
@@ -36,7 +36,9 @@ use crate::{
    path::{GenericArgs, GenericArg},
    adt::VariantDef,
    resolve::{Resolver, Resolution},
-    nameres::Namespace
+    nameres::Namespace,
+    ty::infer::diagnostics::InferenceDiagnostic,
+    diagnostics::DiagnosticSink,
 };
 use super::{Ty, TypableDef, Substs, primitive, op, FnSig, ApplicationTy, TypeCtor};
@@ -96,6 +98,7 @@ pub struct InferenceResult {
    field_resolutions: FxHashMap<ExprId, StructField>,
    /// For each associated item record what it resolves to
    assoc_resolutions: FxHashMap<ExprOrPatId, ImplItem>,
+    diagnostics: Vec<InferenceDiagnostic>,
    pub(super) type_of_expr: ArenaMap<ExprId, Ty>,
    pub(super) type_of_pat: ArenaMap<PatId, Ty>,
 }
@@ -113,6 +116,14 @@ impl InferenceResult {
    pub fn assoc_resolutions_for_pat(&self, id: PatId) -> Option<ImplItem> {
        self.assoc_resolutions.get(&id.into()).map(|it| *it)
    }
+    pub(crate) fn add_diagnostics(
+        &self,
+        db: &impl HirDatabase,
+        owner: Function,
+        sink: &mut DiagnosticSink,
+    ) {
+        self.diagnostics.iter().for_each(|it| it.add_to(db, owner, sink))
+    }
 }
 impl Index<ExprId> for InferenceResult {
@@ -143,6 +154,7 @@ struct InferenceContext<'a, D: HirDatabase> {
    assoc_resolutions: FxHashMap<ExprOrPatId, ImplItem>,
    type_of_expr: ArenaMap<ExprId, Ty>,
    type_of_pat: ArenaMap<PatId, Ty>,
+    diagnostics: Vec<InferenceDiagnostic>,
    /// The return type of the function being inferred.
    return_ty: Ty,
 }
@@ -155,6 +167,7 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
            assoc_resolutions: FxHashMap::default(),
            type_of_expr: ArenaMap::default(),
            type_of_pat: ArenaMap::default(),
+            diagnostics: Vec::default(),
            var_unification_table: InPlaceUnificationTable::new(),
            return_ty: Ty::Unknown, // set in collect_fn_signature
            db,
@@ -181,6 +194,7 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
            assoc_resolutions: self.assoc_resolutions,
            type_of_expr: expr_types,
            type_of_pat: pat_types,
+            diagnostics: self.diagnostics,
        }
    }
@@ -807,7 +821,8 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
            }
            Expr::MethodCall { receiver, args, method_name, generic_args } => {
                let receiver_ty = self.infer_expr(*receiver, &Expectation::none());
-                let resolved = receiver_ty.clone().lookup_method(self.db, method_name);
+                let resolved =
+                    receiver_ty.clone().lookup_method(self.db, method_name, &self.resolver);
                let (derefed_receiver_ty, method_ty, def_generics) = match resolved {
                    Some((ty, func)) => {
                        self.write_method_resolution(tgt_expr, func);
@@ -915,9 +930,18 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
            Expr::StructLit { path, fields, spread } => {
                let (ty, def_id) = self.resolve_variant(path.as_ref());
                let substs = ty.substs().unwrap_or_else(Substs::empty);
-                for field in fields {
+                for (field_idx, field) in fields.into_iter().enumerate() {
                    let field_ty = def_id
-                        .and_then(|it| it.field(self.db, &field.name))
+                        .and_then(|it| match it.field(self.db, &field.name) {
+                            Some(field) => Some(field),
+                            None => {
+                                self.diagnostics.push(InferenceDiagnostic::NoSuchField {
+                                    expr: tgt_expr,
+                                    field: field_idx,
+                                });
+                                None
+                            }
+                        })
                        .map_or(Ty::Unknown, |field| field.ty(self.db))
                        .subst(&substs);
                    self.infer_expr(field.expr, &Expectation::has_type(field_ty));
@@ -1244,3 +1268,29 @@ impl Expectation {
        Expectation { ty: Ty::Unknown }
    }
 }
+mod diagnostics {
+    use crate::{expr::ExprId, diagnostics::{DiagnosticSink, NoSuchField}, HirDatabase, Function};
+    #[derive(Debug, PartialEq, Eq, Clone)]
+    pub(super) enum InferenceDiagnostic {
+        NoSuchField { expr: ExprId, field: usize },
+    }
+    impl InferenceDiagnostic {
+        pub(super) fn add_to(
+            &self,
+            db: &impl HirDatabase,
+            owner: Function,
+            sink: &mut DiagnosticSink,
+        ) {
+            match self {
+                InferenceDiagnostic::NoSuchField { expr, field } => {
+                    let (file, _) = owner.source(db);
+                    let field = owner.body_source_map(db).field_syntax(*expr, *field);
+                    sink.push(NoSuchField { file, field })
+                }
+            }
+        }
+    }
+}
diff --git a/crates/ra_hir/src/ty/method_resolution.rs b/crates/ra_hir/src/ty/method_resolution.rs
index b1684acf9..3ac8dc46b 100644
--- a/crates/ra_hir/src/ty/method_resolution.rs
+++ b/crates/ra_hir/src/ty/method_resolution.rs
@@ -8,12 +8,12 @@ use rustc_hash::FxHashMap;
 use crate::{
    HirDatabase, Module, Crate, Name, Function, Trait,
-    ids::TraitId,
    impl_block::{ImplId, ImplBlock, ImplItem},
    ty::{Ty, TypeCtor},
-    nameres::CrateModuleId,
+    nameres::CrateModuleId, resolve::Resolver, traits::TraitItem
 };
+use super::{ TraitRef, Substs};
 /// This is used as a key for indexing impls.
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
@@ -38,7 +38,7 @@ pub struct CrateImplBlocks {
    /// To make sense of the CrateModuleIds, we need the source root.
    krate: Crate,
    impls: FxHashMap<TyFingerprint, Vec<(CrateModuleId, ImplId)>>,
-    impls_by_trait: FxHashMap<TraitId, Vec<(CrateModuleId, ImplId)>>,
+    impls_by_trait: FxHashMap<Trait, Vec<(CrateModuleId, ImplId)>>,
 }
 impl CrateImplBlocks {
@@ -56,8 +56,7 @@ impl CrateImplBlocks {
        &'a self,
        tr: &Trait,
    ) -> impl Iterator<Item = ImplBlock> + 'a {
-        let id = tr.id;
+        self.impls_by_trait.get(&tr).into_iter().flat_map(|i| i.iter()).map(
-        self.impls_by_trait.get(&id).into_iter().flat_map(|i| i.iter()).map(
            move |(module_id, impl_id)| {
                let module = Module { krate: self.krate, module_id: *module_id };
                ImplBlock::from_id(module, *impl_id)
@@ -73,18 +72,18 @@ impl CrateImplBlocks {
            let target_ty = impl_block.target_ty(db);
-            if let Some(target_ty_fp) = TyFingerprint::for_impl(&target_ty) {
-                self.impls
-                    .entry(target_ty_fp)
-                    .or_insert_with(Vec::new)
-                    .push((module.module_id, impl_id));
-            }
            if let Some(tr) = impl_block.target_trait(db) {
                self.impls_by_trait
-                    .entry(tr.id)
+                    .entry(tr)
                    .or_insert_with(Vec::new)
                    .push((module.module_id, impl_id));
+            } else {
+                if let Some(target_ty_fp) = TyFingerprint::for_impl(&target_ty) {
+                    self.impls
+                        .entry(target_ty_fp)
+                        .or_insert_with(Vec::new)
+                        .push((module.module_id, impl_id));
+                }
            }
        }
@@ -109,6 +108,20 @@ impl CrateImplBlocks {
    }
 }
+/// Rudimentary check whether an impl exists for a given type and trait; this
+/// will actually be done by chalk.
+pub(crate) fn implements(db: &impl HirDatabase, trait_ref: TraitRef) -> bool {
+    // FIXME use all trait impls in the whole crate graph
+    let krate = trait_ref.trait_.module(db).krate(db);
+    let krate = match krate {
+        Some(krate) => krate,
+        None => return false,
+    };
+    let crate_impl_blocks = db.impls_in_crate(krate);
+    let mut impl_blocks = crate_impl_blocks.lookup_impl_blocks_for_trait(&trait_ref.trait_);
+    impl_blocks.any(|impl_block| &impl_block.target_ty(db) == trait_ref.self_ty())
+}
 fn def_crate(db: &impl HirDatabase, ty: &Ty) -> Option<Crate> {
    match ty {
        Ty::Apply(a_ty) => match a_ty.ctor {
@@ -120,20 +133,64 @@ fn def_crate(db: &impl HirDatabase, ty: &Ty) -> Option<Crate> {
 }
 impl Ty {
-    // FIXME: cache this as a query?
-    // - if so, what signature? (TyFingerprint, Name)?
-    // - or maybe cache all names and def_ids of methods per fingerprint?
    /// Look up the method with the given name, returning the actual autoderefed
    /// receiver type (but without autoref applied yet).
-    pub fn lookup_method(self, db: &impl HirDatabase, name: &Name) -> Option<(Ty, Function)> {
+    pub fn lookup_method(
-        self.iterate_methods(db, |ty, f| {
+        self,
+        db: &impl HirDatabase,
+        name: &Name,
+        resolver: &Resolver,
+    ) -> Option<(Ty, Function)> {
+        // FIXME: trait methods should be used before autoderefs
+        let inherent_method = self.clone().iterate_methods(db, |ty, f| {
            let sig = f.signature(db);
            if sig.name() == name && sig.has_self_param() {
                Some((ty.clone(), f))
            } else {
                None
            }
-        })
+        });
+        inherent_method.or_else(|| self.lookup_trait_method(db, name, resolver))
+    }
+    fn lookup_trait_method(
+        self,
+        db: &impl HirDatabase,
+        name: &Name,
+        resolver: &Resolver,
+    ) -> Option<(Ty, Function)> {
+        let mut candidates = Vec::new();
+        for t in resolver.traits_in_scope() {
+            let data = t.trait_data(db);
+            for item in data.items() {
+                match item {
+                    &TraitItem::Function(m) => {
+                        let sig = m.signature(db);
+                        if sig.name() == name && sig.has_self_param() {
+                            candidates.push((t, m));
+                        }
+                    }
+                    _ => {}
+                }
+            }
+        }
+        // FIXME:
+        //  - we might not actually be able to determine fully that the type
+        //    implements the trait here; it's enough if we (well, Chalk) determine
+        //    that it's possible.
+        //  - when the trait method is picked, we need to register an
+        //    'obligation' somewhere so that we later check that it's really
+        //    implemented
+        //  - both points go for additional requirements from where clauses as
+        //    well (in fact, the 'implements' condition could just be considered a
+        //    'where Self: Trait' clause)
+        candidates.retain(|(t, _m)| {
+            let trait_ref = TraitRef { trait_: *t, substs: Substs::single(self.clone()) };
+            db.implements(trait_ref)
+        });
+        // FIXME if there's multiple candidates here, that's an ambiguity error
+        let (_chosen_trait, chosen_method) = candidates.first()?;
+        Some((self.clone(), *chosen_method))
    }
    // This would be nicer if it just returned an iterator, but that runs into
diff --git a/crates/ra_hir/src/ty/tests.rs b/crates/ra_hir/src/ty/tests.rs
index 5d8ad4aa7..655f3c522 100644
--- a/crates/ra_hir/src/ty/tests.rs
+++ b/crates/ra_hir/src/ty/tests.rs
@@ -1272,8 +1272,8 @@ fn test() {
 [241; 252) 'Struct::FOO': u32
 [262; 263) 'y': u32
 [266; 275) 'Enum::BAR': u32
-[285; 286) 'z': u32
+[285; 286) 'z': {unknown}
-[289; 302) 'TraitTest::ID': u32"###
+[289; 302) 'TraitTest::ID': {unknown}"###
    );
 }
@@ -1918,9 +1918,9 @@ fn test() {
 [110; 114) 'self': &{unknown}
 [170; 228) '{     ...i128 }': ()
 [176; 178) 'S1': S1
-[176; 187) 'S1.method()': {unknown}
+[176; 187) 'S1.method()': u32
 [203; 205) 'S2': S2
-[203; 214) 'S2.method()': {unknown}"###
+[203; 214) 'S2.method()': i128"###
    );
 }
@@ -1964,10 +1964,10 @@ mod bar_test {
 [169; 173) 'self': &{unknown}
 [300; 337) '{     ...     }': ()
 [310; 311) 'S': S
-[310; 320) 'S.method()': {unknown}
+[310; 320) 'S.method()': u32
 [416; 454) '{     ...     }': ()
 [426; 427) 'S': S
-[426; 436) 'S.method()': {unknown}"###
+[426; 436) 'S.method()': i128"###
    );
 }
@@ -2319,3 +2319,27 @@ fn typing_whitespace_inside_a_function_should_not_invalidate_types() {
        assert!(!format!("{:?}", events).contains("infer"), "{:#?}", events)
    }
 }
+#[test]
+fn no_such_field_diagnostics() {
+    let diagnostics = MockDatabase::with_files(
+        r"
+        //- /lib.rs
+        struct S { foo: i32, bar: () }
+        impl S {
+            fn new() -> S {
+                S {
+                    foo: 92,
+                    baz: 62,
+                }
+            }
+        }
+        ",
+    )
+    .diagnostics();
+    assert_snapshot_matches!(diagnostics, @r###"
+"baz: 62": no such field
+"###
+    );
+}
diff --git a/crates/ra_ide_api/Cargo.toml b/crates/ra_ide_api/Cargo.toml
index c64226801..45bab4e28 100644
--- a/crates/ra_ide_api/Cargo.toml
+++ b/crates/ra_ide_api/Cargo.toml
@@ -20,7 +20,6 @@ jemallocator = { version = "0.1.9", optional = true }
 jemalloc-ctl = { version = "0.2.0", optional = true }
 ra_syntax = { path = "../ra_syntax" }
-ra_ide_api_light = { path = "../ra_ide_api_light" }
 ra_text_edit = { path = "../ra_text_edit" }
 ra_db = { path = "../ra_db" }
 ra_fmt = { path = "../ra_fmt" }
diff --git a/crates/ra_ide_api/src/change.rs b/crates/ra_ide_api/src/change.rs
index 26fde91bc..a4a086931 100644
--- a/crates/ra_ide_api/src/change.rs
+++ b/crates/ra_ide_api/src/change.rs
@@ -220,8 +220,8 @@ impl RootDatabase {
        self.query(ra_db::ParseQuery).sweep(sweep);
        self.query(hir::db::HirParseQuery).sweep(sweep);
-        self.query(hir::db::FileItemsQuery).sweep(sweep);
+        self.query(hir::db::AstIdMapQuery).sweep(sweep);
-        self.query(hir::db::FileItemQuery).sweep(sweep);
+        self.query(hir::db::AstIdToNodeQuery).sweep(sweep);
        self.query(hir::db::RawItemsWithSourceMapQuery).sweep(sweep);
        self.query(hir::db::BodyWithSourceMapQuery).sweep(sweep);
diff --git a/crates/ra_ide_api/src/diagnostics.rs b/crates/ra_ide_api/src/diagnostics.rs
index 156f28ca3..5a78e94d8 100644
--- a/crates/ra_ide_api/src/diagnostics.rs
+++ b/crates/ra_ide_api/src/diagnostics.rs
@@ -1,10 +1,11 @@
+use std::cell::RefCell;
 use itertools::Itertools;
-use hir::{Problem, source_binder};
+use hir::{source_binder, diagnostics::{Diagnostic as _, DiagnosticSink}};
 use ra_db::SourceDatabase;
 use ra_syntax::{
    Location, SourceFile, SyntaxKind, TextRange, SyntaxNode,
    ast::{self, AstNode},
 };
 use ra_text_edit::{TextEdit, TextEditBuilder};
@@ -26,11 +27,31 @@ pub(crate) fn diagnostics(db: &RootDatabase, file_id: FileId) -> Vec<Diagnostic>
        check_unnecessary_braces_in_use_statement(&mut res, file_id, node);
        check_struct_shorthand_initialization(&mut res, file_id, node);
    }
+    let res = RefCell::new(res);
+    let mut sink = DiagnosticSink::new(|d| {
+        res.borrow_mut().push(Diagnostic {
+            message: d.message(),
+            range: d.highlight_range(),
+            severity: Severity::Error,
+            fix: None,
+        })
+    })
+    .on::<hir::diagnostics::UnresolvedModule, _>(|d| {
+        let source_root = db.file_source_root(d.file().original_file(db));
+        let create_file = FileSystemEdit::CreateFile { source_root, path: d.candidate.clone() };
+        let fix = SourceChange::file_system_edit("create module", create_file);
+        res.borrow_mut().push(Diagnostic {
+            range: d.highlight_range(),
+            message: d.message(),
+            severity: Severity::Error,
+            fix: Some(fix),
+        })
+    });
    if let Some(m) = source_binder::module_from_file_id(db, file_id) {
-        check_module(&mut res, db, file_id, m);
+        m.diagnostics(db, &mut sink);
    };
-    res
+    drop(sink);
+    res.into_inner()
 }
 fn syntax_errors(acc: &mut Vec<Diagnostic>, source_file: &SourceFile) {
@@ -128,34 +149,12 @@ fn check_struct_shorthand_initialization(
    Some(())
 }
-fn check_module(
-    acc: &mut Vec<Diagnostic>,
-    db: &RootDatabase,
-    file_id: FileId,
-    module: hir::Module,
-) {
-    let source_root = db.file_source_root(file_id);
-    for (name_node, problem) in module.problems(db) {
-        let diag = match problem {
-            Problem::UnresolvedModule { candidate } => {
-                let create_file =
-                    FileSystemEdit::CreateFile { source_root, path: candidate.clone() };
-                let fix = SourceChange::file_system_edit("create module", create_file);
-                Diagnostic {
-                    range: name_node.range(),
-                    message: "unresolved module".to_string(),
-                    severity: Severity::Error,
-                    fix: Some(fix),
-                }
-            }
-        };
-        acc.push(diag)
-    }
-}
 #[cfg(test)]
 mod tests {
    use test_utils::assert_eq_text;
+    use insta::assert_debug_snapshot_matches;
+    use crate::mock_analysis::single_file;
    use super::*;
@@ -185,6 +184,34 @@ mod tests {
    }
    #[test]
+    fn test_unresolved_module_diagnostic() {
+        let (analysis, file_id) = single_file("mod foo;");
+        let diagnostics = analysis.diagnostics(file_id).unwrap();
+        assert_debug_snapshot_matches!(diagnostics, @r####"[
+    Diagnostic {
+        message: "unresolved module",
+        range: [0; 8),
+        fix: Some(
+            SourceChange {
+                label: "create module",
+                source_file_edits: [],
+                file_system_edits: [
+                    CreateFile {
+                        source_root: SourceRootId(
+                            0
+                        ),
+                        path: "foo.rs"
+                    }
+                ],
+                cursor_position: None
+            }
+        ),
+        severity: Error
+    }
+]"####);
+    }
+    #[test]
    fn test_check_unnecessary_braces_in_use_statement() {
        check_not_applicable(
            "
diff --git a/crates/ra_ide_api/src/lib.rs b/crates/ra_ide_api/src/lib.rs
index 8aa3eb088..9063f78a9 100644
--- a/crates/ra_ide_api/src/lib.rs
+++ b/crates/ra_ide_api/src/lib.rs
@@ -6,9 +6,6 @@
 //! database, and the `ra_hir` crate, where majority of the analysis happens.
 //! However, IDE specific bits of the analysis (most notably completion) happen
 //! in this crate.
-//!
-//! The sibling `ra_ide_api_light` handles those bits of IDE functionality
-//! which are restricted to a single file and need only syntax.
 // For proving that RootDatabase is RefUnwindSafe.
 #![recursion_limit = "128"]
@@ -33,10 +30,11 @@ mod impls;
 mod assists;
 mod diagnostics;
 mod syntax_tree;
-mod line_index;
 mod folding_ranges;
+mod line_index;
 mod line_index_utils;
 mod join_lines;
+mod structure;
 mod typing;
 mod matching_brace;
@@ -72,9 +70,10 @@ pub use crate::{
    line_index_utils::translate_offset_with_edit,
    folding_ranges::{Fold, FoldKind},
    syntax_highlighting::HighlightedRange,
+    structure::{StructureNode, file_structure},
    diagnostics::Severity,
 };
-pub use ra_ide_api_light::StructureNode;
 pub use ra_db::{
    Canceled, CrateGraph, CrateId, FileId, FilePosition, FileRange, SourceRootId,
    Edition
@@ -388,7 +387,7 @@ impl Analysis {
    /// file outline.
    pub fn file_structure(&self, file_id: FileId) -> Vec<StructureNode> {
        let file = self.db.parse(file_id);
-        ra_ide_api_light::file_structure(&file)
+        structure::file_structure(&file)
    }
    /// Returns the set of folding ranges.
diff --git a/crates/ra_ide_api/src/parent_module.rs b/crates/ra_ide_api/src/parent_module.rs
index 603c3db6a..27788c984 100644
--- a/crates/ra_ide_api/src/parent_module.rs
+++ b/crates/ra_ide_api/src/parent_module.rs
@@ -28,7 +28,11 @@ pub(crate) fn crate_for(db: &RootDatabase, file_id: FileId) -> Vec<CrateId> {
 #[cfg(test)]
 mod tests {
-    use crate::mock_analysis::analysis_and_position;
+    use crate::{
+        AnalysisChange, CrateGraph,
+        mock_analysis::{analysis_and_position, MockAnalysis},
+        Edition::Edition2018,
+};
    #[test]
    fn test_resolve_parent_module() {
@@ -59,4 +63,28 @@ mod tests {
        let nav = analysis.parent_module(pos).unwrap().pop().unwrap();
        nav.assert_match("baz MODULE FileId(1) [32; 44)");
    }
+    #[test]
+    fn test_resolve_crate_root() {
+        let mock = MockAnalysis::with_files(
+            "
+        //- /bar.rs
+        mod foo;
+        //- /foo.rs
+        // empty <|>
+    ",
+        );
+        let root_file = mock.id_of("/bar.rs");
+        let mod_file = mock.id_of("/foo.rs");
+        let mut host = mock.analysis_host();
+        assert!(host.analysis().crate_for(mod_file).unwrap().is_empty());
+        let mut crate_graph = CrateGraph::default();
+        let crate_id = crate_graph.add_crate_root(root_file, Edition2018);
+        let mut change = AnalysisChange::new();
+        change.set_crate_graph(crate_graph);
+        host.apply_change(change);
+        assert_eq!(host.analysis().crate_for(mod_file).unwrap(), vec![crate_id]);
+    }
 }
diff --git a/crates/ra_ide_api/src/references.rs b/crates/ra_ide_api/src/references.rs
index 22741445a..20bbf11a3 100644
--- a/crates/ra_ide_api/src/references.rs
+++ b/crates/ra_ide_api/src/references.rs
@@ -216,10 +216,56 @@ mod tests {
    use crate::{
        mock_analysis::single_file_with_position,
        mock_analysis::analysis_and_position,
-        FileId
+        FileId, ReferenceSearchResult
 };
    #[test]
+    fn test_find_all_refs_for_local() {
+        let code = r#"
+    fn main() {
+        let mut i = 1;
+        let j = 1;
+        i = i<|> + j;
+        {
+            i = 0;
+        }
+        i = 5;
+    }"#;
+        let refs = get_all_refs(code);
+        assert_eq!(refs.len(), 5);
+    }
+    #[test]
+    fn test_find_all_refs_for_param_inside() {
+        let code = r#"
+    fn foo(i : u32) -> u32 {
+        i<|>
+    }"#;
+        let refs = get_all_refs(code);
+        assert_eq!(refs.len(), 2);
+    }
+    #[test]
+    fn test_find_all_refs_for_fn_param() {
+        let code = r#"
+    fn foo(i<|> : u32) -> u32 {
+        i
+    }"#;
+        let refs = get_all_refs(code);
+        assert_eq!(refs.len(), 2);
+    }
+    fn get_all_refs(text: &str) -> ReferenceSearchResult {
+        let (analysis, position) = single_file_with_position(text);
+        analysis.find_all_refs(position).unwrap().unwrap()
+    }
+    #[test]
    fn test_rename_for_local() {
        test_rename(
            r#"
diff --git a/crates/ra_ide_api_light/src/snapshots/tests__file_structure.snap b/crates/ra_ide_api/src/snapshots/tests__file_structure.snap
index 8e4184b31..2efa8e22c 100644
--- a/crates/ra_ide_api_light/src/snapshots/tests__file_structure.snap
+++ b/crates/ra_ide_api/src/snapshots/tests__file_structure.snap
@@ -1,7 +1,7 @@
 ---
 created: "2019-02-05T22:03:50.763530100Z"
 creator: [email protected]
-source: crates/ra_ide_api_light/src/structure.rs
+source: crates/ra_ide_api/src/structure.rs
 expression: structure
 ---
 [
diff --git a/crates/ra_ide_api_light/src/structure.rs b/crates/ra_ide_api/src/structure.rs
index ec2c9bbc6..ec2c9bbc6 100644
--- a/crates/ra_ide_api_light/src/structure.rs
+++ b/crates/ra_ide_api/src/structure.rs
diff --git a/crates/ra_ide_api/src/symbol_index.rs b/crates/ra_ide_api/src/symbol_index.rs
index 0978d164a..0eadc4e71 100644
--- a/crates/ra_ide_api/src/symbol_index.rs
+++ b/crates/ra_ide_api/src/symbol_index.rs
@@ -270,3 +270,61 @@ fn to_file_symbol(node: &SyntaxNode, file_id: FileId) -> Option<FileSymbol> {
        container_name: None,
    })
 }
+#[cfg(test)]
+mod tests {
+    use ra_syntax::SmolStr;
+    use crate::{
+        navigation_target::NavigationTarget,
+        mock_analysis::single_file,
+        Query,
+};
+    #[test]
+    fn test_world_symbols_with_no_container() {
+        let code = r#"
+    enum FooInner { }
+    "#;
+        let mut symbols = get_symbols_matching(code, "FooInner");
+        let s = symbols.pop().unwrap();
+        assert_eq!(s.name(), "FooInner");
+        assert!(s.container_name().is_none());
+    }
+    #[test]
+    fn test_world_symbols_include_container_name() {
+        let code = r#"
+fn foo() {
+    enum FooInner { }
+}
+    "#;
+        let mut symbols = get_symbols_matching(code, "FooInner");
+        let s = symbols.pop().unwrap();
+        assert_eq!(s.name(), "FooInner");
+        assert_eq!(s.container_name(), Some(&SmolStr::new("foo")));
+        let code = r#"
+mod foo {
+    struct FooInner;
+}
+    "#;
+        let mut symbols = get_symbols_matching(code, "FooInner");
+        let s = symbols.pop().unwrap();
+        assert_eq!(s.name(), "FooInner");
+        assert_eq!(s.container_name(), Some(&SmolStr::new("foo")));
+    }
+    fn get_symbols_matching(text: &str, query: &str) -> Vec<NavigationTarget> {
+        let (analysis, _) = single_file(text);
+        analysis.symbol_search(Query::new(query.into())).unwrap()
+    }
+}
diff --git a/crates/ra_ide_api/src/syntax_tree.rs b/crates/ra_ide_api/src/syntax_tree.rs
index bbe9222b4..276f8a8c8 100644
--- a/crates/ra_ide_api/src/syntax_tree.rs
+++ b/crates/ra_ide_api/src/syntax_tree.rs
@@ -85,3 +85,260 @@ fn syntax_tree_for_token<T: AstToken>(node: &T, text_range: TextRange) -> Option
    None
 }
+#[cfg(test)]
+mod tests {
+    use crate::mock_analysis::{single_file, single_file_with_range};
+    #[test]
+    fn test_syntax_tree_without_range() {
+        // Basic syntax
+        let (analysis, file_id) = single_file(r#"fn foo() {}"#);
+        let syn = analysis.syntax_tree(file_id, None);
+        assert_eq!(
+            syn.trim(),
+            r#"
+SOURCE_FILE@[0; 11)
+  FN_DEF@[0; 11)
+    FN_KW@[0; 2)
+    WHITESPACE@[2; 3)
+    NAME@[3; 6)
+      IDENT@[3; 6) "foo"
+    PARAM_LIST@[6; 8)
+      L_PAREN@[6; 7)
+      R_PAREN@[7; 8)
+    WHITESPACE@[8; 9)
+    BLOCK@[9; 11)
+      L_CURLY@[9; 10)
+      R_CURLY@[10; 11)
+    "#
+            .trim()
+        );
+        let (analysis, file_id) = single_file(
+            r#"
+fn test() {
+    assert!("
+    fn foo() {
+    }
+    ", "");
+}"#
+            .trim(),
+        );
+        let syn = analysis.syntax_tree(file_id, None);
+        assert_eq!(
+            syn.trim(),
+            r#"
+SOURCE_FILE@[0; 60)
+  FN_DEF@[0; 60)
+    FN_KW@[0; 2)
+    WHITESPACE@[2; 3)
+    NAME@[3; 7)
+      IDENT@[3; 7) "test"
+    PARAM_LIST@[7; 9)
+      L_PAREN@[7; 8)
+      R_PAREN@[8; 9)
+    WHITESPACE@[9; 10)
+    BLOCK@[10; 60)
+      L_CURLY@[10; 11)
+      WHITESPACE@[11; 16)
+      EXPR_STMT@[16; 58)
+        MACRO_CALL@[16; 57)
+          PATH@[16; 22)
+            PATH_SEGMENT@[16; 22)
+              NAME_REF@[16; 22)
+                IDENT@[16; 22) "assert"
+          EXCL@[22; 23)
+          TOKEN_TREE@[23; 57)
+            L_PAREN@[23; 24)
+            STRING@[24; 52)
+            COMMA@[52; 53)
+            WHITESPACE@[53; 54)
+            STRING@[54; 56)
+            R_PAREN@[56; 57)
+        SEMI@[57; 58)
+      WHITESPACE@[58; 59)
+      R_CURLY@[59; 60)
+    "#
+            .trim()
+        );
+    }
+    #[test]
+    fn test_syntax_tree_with_range() {
+        let (analysis, range) = single_file_with_range(r#"<|>fn foo() {}<|>"#.trim());
+        let syn = analysis.syntax_tree(range.file_id, Some(range.range));
+        assert_eq!(
+            syn.trim(),
+            r#"
+FN_DEF@[0; 11)
+  FN_KW@[0; 2)
+  WHITESPACE@[2; 3)
+  NAME@[3; 6)
+    IDENT@[3; 6) "foo"
+  PARAM_LIST@[6; 8)
+    L_PAREN@[6; 7)
+    R_PAREN@[7; 8)
+  WHITESPACE@[8; 9)
+  BLOCK@[9; 11)
+    L_CURLY@[9; 10)
+    R_CURLY@[10; 11)
+    "#
+            .trim()
+        );
+        let (analysis, range) = single_file_with_range(
+            r#"fn test() {
+    <|>assert!("
+    fn foo() {
+    }
+    ", "");<|>
+}"#
+            .trim(),
+        );
+        let syn = analysis.syntax_tree(range.file_id, Some(range.range));
+        assert_eq!(
+            syn.trim(),
+            r#"
+EXPR_STMT@[16; 58)
+  MACRO_CALL@[16; 57)
+    PATH@[16; 22)
+      PATH_SEGMENT@[16; 22)
+        NAME_REF@[16; 22)
+          IDENT@[16; 22) "assert"
+    EXCL@[22; 23)
+    TOKEN_TREE@[23; 57)
+      L_PAREN@[23; 24)
+      STRING@[24; 52)
+      COMMA@[52; 53)
+      WHITESPACE@[53; 54)
+      STRING@[54; 56)
+      R_PAREN@[56; 57)
+  SEMI@[57; 58)
+    "#
+            .trim()
+        );
+    }
+    #[test]
+    fn test_syntax_tree_inside_string() {
+        let (analysis, range) = single_file_with_range(
+            r#"fn test() {
+    assert!("
+<|>fn foo() {
+}<|>
+fn bar() {
+}
+    ", "");
+}"#
+            .trim(),
+        );
+        let syn = analysis.syntax_tree(range.file_id, Some(range.range));
+        assert_eq!(
+            syn.trim(),
+            r#"
+SOURCE_FILE@[0; 12)
+  FN_DEF@[0; 12)
+    FN_KW@[0; 2)
+    WHITESPACE@[2; 3)
+    NAME@[3; 6)
+      IDENT@[3; 6) "foo"
+    PARAM_LIST@[6; 8)
+      L_PAREN@[6; 7)
+      R_PAREN@[7; 8)
+    WHITESPACE@[8; 9)
+    BLOCK@[9; 12)
+      L_CURLY@[9; 10)
+      WHITESPACE@[10; 11)
+      R_CURLY@[11; 12)
+"#
+            .trim()
+        );
+        // With a raw string
+        let (analysis, range) = single_file_with_range(
+            r###"fn test() {
+    assert!(r#"
+<|>fn foo() {
+}<|>
+fn bar() {
+}
+    "#, "");
+}"###
+                .trim(),
+        );
+        let syn = analysis.syntax_tree(range.file_id, Some(range.range));
+        assert_eq!(
+            syn.trim(),
+            r#"
+SOURCE_FILE@[0; 12)
+  FN_DEF@[0; 12)
+    FN_KW@[0; 2)
+    WHITESPACE@[2; 3)
+    NAME@[3; 6)
+      IDENT@[3; 6) "foo"
+    PARAM_LIST@[6; 8)
+      L_PAREN@[6; 7)
+      R_PAREN@[7; 8)
+    WHITESPACE@[8; 9)
+    BLOCK@[9; 12)
+      L_CURLY@[9; 10)
+      WHITESPACE@[10; 11)
+      R_CURLY@[11; 12)
+"#
+            .trim()
+        );
+        // With a raw string
+        let (analysis, range) = single_file_with_range(
+            r###"fn test() {
+    assert!(r<|>#"
+fn foo() {
+}
+fn bar() {
+}"<|>#, "");
+}"###
+                .trim(),
+        );
+        let syn = analysis.syntax_tree(range.file_id, Some(range.range));
+        assert_eq!(
+            syn.trim(),
+            r#"
+SOURCE_FILE@[0; 25)
+  FN_DEF@[0; 12)
+    FN_KW@[0; 2)
+    WHITESPACE@[2; 3)
+    NAME@[3; 6)
+      IDENT@[3; 6) "foo"
+    PARAM_LIST@[6; 8)
+      L_PAREN@[6; 7)
+      R_PAREN@[7; 8)
+    WHITESPACE@[8; 9)
+    BLOCK@[9; 12)
+      L_CURLY@[9; 10)
+      WHITESPACE@[10; 11)
+      R_CURLY@[11; 12)
+  WHITESPACE@[12; 13)
+  FN_DEF@[13; 25)
+    FN_KW@[13; 15)
+    WHITESPACE@[15; 16)
+    NAME@[16; 19)
+      IDENT@[16; 19) "bar"
+    PARAM_LIST@[19; 21)
+      L_PAREN@[19; 20)
+      R_PAREN@[20; 21)
+    WHITESPACE@[21; 22)
+    BLOCK@[22; 25)
+      L_CURLY@[22; 23)
+      WHITESPACE@[23; 24)
+      R_CURLY@[24; 25)
+"#
+            .trim()
+        );
+    }
+}
diff --git a/crates/ra_ide_api/tests/test/main.rs b/crates/ra_ide_api/tests/test/main.rs
deleted file mode 100644
index 0f0766f62..000000000
--- a/crates/ra_ide_api/tests/test/main.rs
+++ /dev/null
@@ -1,392 +0,0 @@
-use insta::assert_debug_snapshot_matches;
-use ra_ide_api::{
-    mock_analysis::{single_file, single_file_with_position, single_file_with_range, MockAnalysis},
-    AnalysisChange, CrateGraph, Edition::Edition2018, Query, NavigationTarget,
-    ReferenceSearchResult,
-};
-use ra_syntax::SmolStr;
-#[test]
-fn test_unresolved_module_diagnostic() {
-    let (analysis, file_id) = single_file("mod foo;");
-    let diagnostics = analysis.diagnostics(file_id).unwrap();
-    assert_debug_snapshot_matches!("unresolved_module_diagnostic", &diagnostics);
-}
-// FIXME: move this test to hir
-#[test]
-fn test_unresolved_module_diagnostic_no_diag_for_inline_mode() {
-    let (analysis, file_id) = single_file("mod foo {}");
-    let diagnostics = analysis.diagnostics(file_id).unwrap();
-    assert!(diagnostics.is_empty());
-}
-#[test]
-fn test_resolve_crate_root() {
-    let mock = MockAnalysis::with_files(
-        "
-        //- /bar.rs
-        mod foo;
-        //- /foo.rs
-        // empty <|>
-    ",
-    );
-    let root_file = mock.id_of("/bar.rs");
-    let mod_file = mock.id_of("/foo.rs");
-    let mut host = mock.analysis_host();
-    assert!(host.analysis().crate_for(mod_file).unwrap().is_empty());
-    let mut crate_graph = CrateGraph::default();
-    let crate_id = crate_graph.add_crate_root(root_file, Edition2018);
-    let mut change = AnalysisChange::new();
-    change.set_crate_graph(crate_graph);
-    host.apply_change(change);
-    assert_eq!(host.analysis().crate_for(mod_file).unwrap(), vec![crate_id]);
-}
-fn get_all_refs(text: &str) -> ReferenceSearchResult {
-    let (analysis, position) = single_file_with_position(text);
-    analysis.find_all_refs(position).unwrap().unwrap()
-}
-fn get_symbols_matching(text: &str, query: &str) -> Vec<NavigationTarget> {
-    let (analysis, _) = single_file(text);
-    analysis.symbol_search(Query::new(query.into())).unwrap()
-}
-#[test]
-fn test_find_all_refs_for_local() {
-    let code = r#"
-    fn main() {
-        let mut i = 1;
-        let j = 1;
-        i = i<|> + j;
-        {
-            i = 0;
-        }
-        i = 5;
-    }"#;
-    let refs = get_all_refs(code);
-    assert_eq!(refs.len(), 5);
-}
-#[test]
-fn test_find_all_refs_for_param_inside() {
-    let code = r#"
-    fn foo(i : u32) -> u32 {
-        i<|>
-    }"#;
-    let refs = get_all_refs(code);
-    assert_eq!(refs.len(), 2);
-}
-#[test]
-fn test_find_all_refs_for_fn_param() {
-    let code = r#"
-    fn foo(i<|> : u32) -> u32 {
-        i
-    }"#;
-    let refs = get_all_refs(code);
-    assert_eq!(refs.len(), 2);
-}
-#[test]
-fn test_world_symbols_with_no_container() {
-    let code = r#"
-    enum FooInner { }
-    "#;
-    let mut symbols = get_symbols_matching(code, "FooInner");
-    let s = symbols.pop().unwrap();
-    assert_eq!(s.name(), "FooInner");
-    assert!(s.container_name().is_none());
-}
-#[test]
-fn test_world_symbols_include_container_name() {
-    let code = r#"
-fn foo() {
-    enum FooInner { }
-}
-    "#;
-    let mut symbols = get_symbols_matching(code, "FooInner");
-    let s = symbols.pop().unwrap();
-    assert_eq!(s.name(), "FooInner");
-    assert_eq!(s.container_name(), Some(&SmolStr::new("foo")));
-    let code = r#"
-mod foo {
-    struct FooInner;
-}
-    "#;
-    let mut symbols = get_symbols_matching(code, "FooInner");
-    let s = symbols.pop().unwrap();
-    assert_eq!(s.name(), "FooInner");
-    assert_eq!(s.container_name(), Some(&SmolStr::new("foo")));
-}
-#[test]
-fn test_syntax_tree_without_range() {
-    // Basic syntax
-    let (analysis, file_id) = single_file(r#"fn foo() {}"#);
-    let syn = analysis.syntax_tree(file_id, None);
-    assert_eq!(
-        syn.trim(),
-        r#"
-SOURCE_FILE@[0; 11)
-  FN_DEF@[0; 11)
-    FN_KW@[0; 2)
-    WHITESPACE@[2; 3)
-    NAME@[3; 6)
-      IDENT@[3; 6) "foo"
-    PARAM_LIST@[6; 8)
-      L_PAREN@[6; 7)
-      R_PAREN@[7; 8)
-    WHITESPACE@[8; 9)
-    BLOCK@[9; 11)
-      L_CURLY@[9; 10)
-      R_CURLY@[10; 11)
-    "#
-        .trim()
-    );
-    let (analysis, file_id) = single_file(
-        r#"
-fn test() {
-    assert!("
-    fn foo() {
-    }
-    ", "");
-}"#
-        .trim(),
-    );
-    let syn = analysis.syntax_tree(file_id, None);
-    assert_eq!(
-        syn.trim(),
-        r#"
-SOURCE_FILE@[0; 60)
-  FN_DEF@[0; 60)
-    FN_KW@[0; 2)
-    WHITESPACE@[2; 3)
-    NAME@[3; 7)
-      IDENT@[3; 7) "test"
-    PARAM_LIST@[7; 9)
-      L_PAREN@[7; 8)
-      R_PAREN@[8; 9)
-    WHITESPACE@[9; 10)
-    BLOCK@[10; 60)
-      L_CURLY@[10; 11)
-      WHITESPACE@[11; 16)
-      EXPR_STMT@[16; 58)
-        MACRO_CALL@[16; 57)
-          PATH@[16; 22)
-            PATH_SEGMENT@[16; 22)
-              NAME_REF@[16; 22)
-                IDENT@[16; 22) "assert"
-          EXCL@[22; 23)
-          TOKEN_TREE@[23; 57)
-            L_PAREN@[23; 24)
-            STRING@[24; 52)
-            COMMA@[52; 53)
-            WHITESPACE@[53; 54)
-            STRING@[54; 56)
-            R_PAREN@[56; 57)
-        SEMI@[57; 58)
-      WHITESPACE@[58; 59)
-      R_CURLY@[59; 60)
-    "#
-        .trim()
-    );
-}
-#[test]
-fn test_syntax_tree_with_range() {
-    let (analysis, range) = single_file_with_range(r#"<|>fn foo() {}<|>"#.trim());
-    let syn = analysis.syntax_tree(range.file_id, Some(range.range));
-    assert_eq!(
-        syn.trim(),
-        r#"
-FN_DEF@[0; 11)
-  FN_KW@[0; 2)
-  WHITESPACE@[2; 3)
-  NAME@[3; 6)
-    IDENT@[3; 6) "foo"
-  PARAM_LIST@[6; 8)
-    L_PAREN@[6; 7)
-    R_PAREN@[7; 8)
-  WHITESPACE@[8; 9)
-  BLOCK@[9; 11)
-    L_CURLY@[9; 10)
-    R_CURLY@[10; 11)
-    "#
-        .trim()
-    );
-    let (analysis, range) = single_file_with_range(
-        r#"fn test() {
-    <|>assert!("
-    fn foo() {
-    }
-    ", "");<|>
-}"#
-        .trim(),
-    );
-    let syn = analysis.syntax_tree(range.file_id, Some(range.range));
-    assert_eq!(
-        syn.trim(),
-        r#"
-EXPR_STMT@[16; 58)
-  MACRO_CALL@[16; 57)
-    PATH@[16; 22)
-      PATH_SEGMENT@[16; 22)
-        NAME_REF@[16; 22)
-          IDENT@[16; 22) "assert"
-    EXCL@[22; 23)
-    TOKEN_TREE@[23; 57)
-      L_PAREN@[23; 24)
-      STRING@[24; 52)
-      COMMA@[52; 53)
-      WHITESPACE@[53; 54)
-      STRING@[54; 56)
-      R_PAREN@[56; 57)
-  SEMI@[57; 58)
-    "#
-        .trim()
-    );
-}
-#[test]
-fn test_syntax_tree_inside_string() {
-    let (analysis, range) = single_file_with_range(
-        r#"fn test() {
-    assert!("
-<|>fn foo() {
-}<|>
-fn bar() {
-}
-    ", "");
-}"#
-        .trim(),
-    );
-    let syn = analysis.syntax_tree(range.file_id, Some(range.range));
-    assert_eq!(
-        syn.trim(),
-        r#"
-SOURCE_FILE@[0; 12)
-  FN_DEF@[0; 12)
-    FN_KW@[0; 2)
-    WHITESPACE@[2; 3)
-    NAME@[3; 6)
-      IDENT@[3; 6) "foo"
-    PARAM_LIST@[6; 8)
-      L_PAREN@[6; 7)
-      R_PAREN@[7; 8)
-    WHITESPACE@[8; 9)
-    BLOCK@[9; 12)
-      L_CURLY@[9; 10)
-      WHITESPACE@[10; 11)
-      R_CURLY@[11; 12)
-"#
-        .trim()
-    );
-    // With a raw string
-    let (analysis, range) = single_file_with_range(
-        r###"fn test() {
-    assert!(r#"
-<|>fn foo() {
-}<|>
-fn bar() {
-}
-    "#, "");
-}"###
-            .trim(),
-    );
-    let syn = analysis.syntax_tree(range.file_id, Some(range.range));
-    assert_eq!(
-        syn.trim(),
-        r#"
-SOURCE_FILE@[0; 12)
-  FN_DEF@[0; 12)
-    FN_KW@[0; 2)
-    WHITESPACE@[2; 3)
-    NAME@[3; 6)
-      IDENT@[3; 6) "foo"
-    PARAM_LIST@[6; 8)
-      L_PAREN@[6; 7)
-      R_PAREN@[7; 8)
-    WHITESPACE@[8; 9)
-    BLOCK@[9; 12)
-      L_CURLY@[9; 10)
-      WHITESPACE@[10; 11)
-      R_CURLY@[11; 12)
-"#
-        .trim()
-    );
-    // With a raw string
-    let (analysis, range) = single_file_with_range(
-        r###"fn test() {
-    assert!(r<|>#"
-fn foo() {
-}
-fn bar() {
-}"<|>#, "");
-}"###
-            .trim(),
-    );
-    let syn = analysis.syntax_tree(range.file_id, Some(range.range));
-    assert_eq!(
-        syn.trim(),
-        r#"
-SOURCE_FILE@[0; 25)
-  FN_DEF@[0; 12)
-    FN_KW@[0; 2)
-    WHITESPACE@[2; 3)
-    NAME@[3; 6)
-      IDENT@[3; 6) "foo"
-    PARAM_LIST@[6; 8)
-      L_PAREN@[6; 7)
-      R_PAREN@[7; 8)
-    WHITESPACE@[8; 9)
-    BLOCK@[9; 12)
-      L_CURLY@[9; 10)
-      WHITESPACE@[10; 11)
-      R_CURLY@[11; 12)
-  WHITESPACE@[12; 13)
-  FN_DEF@[13; 25)
-    FN_KW@[13; 15)
-    WHITESPACE@[15; 16)
-    NAME@[16; 19)
-      IDENT@[16; 19) "bar"
-    PARAM_LIST@[19; 21)
-      L_PAREN@[19; 20)
-      R_PAREN@[20; 21)
-    WHITESPACE@[21; 22)
-    BLOCK@[22; 25)
-      L_CURLY@[22; 23)
-      WHITESPACE@[23; 24)
-      R_CURLY@[24; 25)
-"#
-        .trim()
-    );
-}
diff --git a/crates/ra_ide_api/tests/test/snapshots/test__unresolved_module_diagnostic.snap b/crates/ra_ide_api/tests/test/snapshots/test__unresolved_module_diagnostic.snap
deleted file mode 100644
index 5bb953892..000000000
--- a/crates/ra_ide_api/tests/test/snapshots/test__unresolved_module_diagnostic.snap
+++ /dev/null
@@ -1,28 +0,0 @@
---
-created: "2019-01-22T14:45:01.486985900+00:00"
-creator: [email protected]
-expression: "&diagnostics"
-source: "crates\\ra_ide_api\\tests\\test\\main.rs"
---
-[
-    Diagnostic {
-        message: "unresolved module",
-        range: [0; 8),
-        fix: Some(
-            SourceChange {
-                label: "create module",
-                source_file_edits: [],
-                file_system_edits: [
-                    CreateFile {
-                        source_root: SourceRootId(
-                            0
-                        ),
-                        path: "foo.rs"
-                    }
-                ],
-                cursor_position: None
-            }
-        ),
-        severity: Error
-    }
-]
diff --git a/crates/ra_ide_api_light/Cargo.toml b/crates/ra_ide_api_light/Cargo.toml
deleted file mode 100644
index 4e69f5325..000000000
--- a/crates/ra_ide_api_light/Cargo.toml
+++ /dev/null
@@ -1,26 +0,0 @@
-[package]
-edition = "2018"
-name = "ra_ide_api_light"
-version = "0.1.0"
-authors = ["rust-analyzer developers"]
-publish = false
-[dependencies]
-itertools = "0.8.0"
-superslice = "1.0.0"
-join_to_string = "0.1.1"
-rustc-hash = "1.0"
-ra_syntax = { path = "../ra_syntax" }
-ra_text_edit = { path = "../ra_text_edit" }
-ra_fmt = { path = "../ra_fmt" }
-[dev-dependencies]
-test_utils = { path = "../test_utils" }
-insta = "0.7.0"
-[dev-dependencies.proptest]
-version = "0.9.0"
-# Disable `fork` feature to allow compiling on webassembly
-default-features = false
-features = ["std", "bit-set", "break-dead-code"]
diff --git a/crates/ra_ide_api_light/src/lib.rs b/crates/ra_ide_api_light/src/lib.rs
deleted file mode 100644
index df7f144b6..000000000
--- a/crates/ra_ide_api_light/src/lib.rs
+++ /dev/null
@@ -1,12 +0,0 @@
-//! This crate provides those IDE features which use only a single file.
-//!
-//! This usually means functions which take syntax tree as an input and produce
-//! an edit or some auxiliary info.
-mod structure;
-use ra_syntax::TextRange;
-pub use crate::{
-    structure::{file_structure, StructureNode},
-};
diff --git a/crates/ra_parser/src/grammar.rs b/crates/ra_parser/src/grammar.rs
index e428faffb..b2ffeff8c 100644
--- a/crates/ra_parser/src/grammar.rs
+++ b/crates/ra_parser/src/grammar.rs
@@ -184,6 +184,10 @@ fn name_ref(p: &mut Parser) {
        let m = p.start();
        p.bump();
        m.complete(p, NAME_REF);
+    } else if p.at(SELF_KW) {
+        let m = p.start();
+        p.bump();
+        m.complete(p, SELF_KW);
    } else {
        p.err_and_bump("expected identifier");
    }
diff --git a/crates/ra_syntax/src/ast/generated.rs b/crates/ra_syntax/src/ast/generated.rs
index 54b72f8c5..47a37e4d1 100644
--- a/crates/ra_syntax/src/ast/generated.rs
+++ b/crates/ra_syntax/src/ast/generated.rs
@@ -4061,7 +4061,11 @@ impl ast::NameOwner for TraitDef {}
 impl ast::AttrsOwner for TraitDef {}
 impl ast::DocCommentsOwner for TraitDef {}
 impl ast::TypeParamsOwner for TraitDef {}
-impl TraitDef {}
+impl TraitDef {
+    pub fn item_list(&self) -> Option<&ItemList> {
+        super::child_opt(self)
+    }
+}
 // TrueKw
 #[derive(Debug, PartialEq, Eq, Hash)]
diff --git a/crates/ra_syntax/src/grammar.ron b/crates/ra_syntax/src/grammar.ron
index 4f8e19bd0..ad6d74162 100644
--- a/crates/ra_syntax/src/grammar.ron
+++ b/crates/ra_syntax/src/grammar.ron
@@ -292,7 +292,10 @@ Grammar(
        ], options: [["variant_list", "EnumVariantList"]] ),
        "EnumVariantList": ( collections: [["variants", "EnumVariant"]] ),
        "EnumVariant": ( traits: ["NameOwner", "DocCommentsOwner", "AttrsOwner"], options: ["Expr"] ),
-        "TraitDef": ( traits: ["VisibilityOwner", "NameOwner", "AttrsOwner", "DocCommentsOwner", "TypeParamsOwner"] ),
+        "TraitDef": (
+            traits: ["VisibilityOwner", "NameOwner", "AttrsOwner", "DocCommentsOwner", "TypeParamsOwner"],
+            options: ["ItemList"]
+        ),
        "Module": (
            traits: ["VisibilityOwner", "NameOwner", "AttrsOwner", "DocCommentsOwner" ],
            options: [ "ItemList" ]
diff --git a/crates/ra_syntax/src/ptr.rs b/crates/ra_syntax/src/ptr.rs
index aae590cb6..d8de1c4c1 100644
--- a/crates/ra_syntax/src/ptr.rs
+++ b/crates/ra_syntax/src/ptr.rs
@@ -64,6 +64,12 @@ impl<N: AstNode> AstPtr<N> {
    }
 }
+impl<N: AstNode> From<AstPtr<N>> for SyntaxNodePtr {
+    fn from(ptr: AstPtr<N>) -> SyntaxNodePtr {
+        ptr.raw
+    }
+}
 #[test]
 fn test_local_syntax_ptr() {
    use crate::{ast, AstNode};
diff --git a/crates/ra_syntax/tests/data/parser/ok/0007_extern_crate.rs b/crates/ra_syntax/tests/data/parser/ok/0007_extern_crate.rs
index 3ce336676..ab81a608c 100644
--- a/crates/ra_syntax/tests/data/parser/ok/0007_extern_crate.rs
+++ b/crates/ra_syntax/tests/data/parser/ok/0007_extern_crate.rs
@@ -1,2 +1,3 @@
 extern crate foo;
 extern crate foo as bar;
+extern crate self as baz;
diff --git a/crates/ra_syntax/tests/data/parser/ok/0007_extern_crate.txt b/crates/ra_syntax/tests/data/parser/ok/0007_extern_crate.txt
index 5558d952e..0176260c1 100644
--- a/crates/ra_syntax/tests/data/parser/ok/0007_extern_crate.txt
+++ b/crates/ra_syntax/tests/data/parser/ok/0007_extern_crate.txt
@@ -1,4 +1,4 @@
-SOURCE_FILE@[0; 43)
+SOURCE_FILE@[0; 69)
  EXTERN_CRATE_ITEM@[0; 17)
    EXTERN_KW@[0; 6)
    WHITESPACE@[6; 7)
@@ -23,3 +23,18 @@ SOURCE_FILE@[0; 43)
        IDENT@[38; 41) "bar"
    SEMI@[41; 42)
  WHITESPACE@[42; 43)
+  EXTERN_CRATE_ITEM@[43; 68)
+    EXTERN_KW@[43; 49)
+    WHITESPACE@[49; 50)
+    CRATE_KW@[50; 55)
+    WHITESPACE@[55; 56)
+    SELF_KW@[56; 60)
+      SELF_KW@[56; 60)
+    WHITESPACE@[60; 61)
+    ALIAS@[61; 67)
+      AS_KW@[61; 63)
+      WHITESPACE@[63; 64)
+      NAME@[64; 67)
+        IDENT@[64; 67) "baz"
+    SEMI@[67; 68)
+  WHITESPACE@[68; 69)
diff --git a/crates/tools/src/lib.rs b/crates/tools/src/lib.rs
index 1e29c63d4..11b52ccb7 100644
--- a/crates/tools/src/lib.rs
+++ b/crates/tools/src/lib.rs
@@ -115,7 +115,11 @@ pub fn install_rustfmt() -> Result<()> {
 }
 pub fn install_format_hook() -> Result<()> {
-    let result_path = Path::new("./.git/hooks/pre-commit");
+    let result_path = Path::new(if cfg!(windows) {
+        "./.git/hooks/pre-commit.exe"
+    } else {
+        "./.git/hooks/pre-commit"
+    });
    if !result_path.exists() {
        run("cargo build --package tools --bin pre-commit", ".")?;
        if cfg!(windows) {
diff --git a/docs/dev/architecture.md b/docs/dev/architecture.md
index f990d5bf0..890b18fcd 100644
--- a/docs/dev/architecture.md
+++ b/docs/dev/architecture.md
@@ -130,19 +130,6 @@ APIs in this crate are IDE centric: they take text offsets as input and produce
 offsets and strings as output. This works on top of rich code model powered by
 `hir`.
-### `crates/ra_ide_api_light`
-All IDE features which can be implemented if you only have access to a single
-file. `ra_ide_api_light` could be used to enhance editing of Rust code without
-the need to fiddle with build-systems, file synchronization and such.
-In a sense, `ra_ide_api_light` is just a bunch of pure functions which take a
-syntax tree as input.
-The tests for `ra_ide_api_light` are `#[cfg(test)] mod tests` unit-tests spread
-throughout its modules.
 ### `crates/ra_lsp_server`
 An LSP implementation which wraps `ra_ide_api` into a langauge server protocol.
diff --git a/docs/user/features.md b/docs/user/features.md
index b9d2aa84f..7173d88e9 100644
--- a/docs/user/features.md
+++ b/docs/user/features.md
@@ -210,7 +210,7 @@ fn main() {
 }
 ```
-- Fill struct fields
+- Fill struct fields
 ```rust
 // before:
@@ -270,7 +270,22 @@ fn foo() {
 }
 ```
-- Remove `dbg!`
+- Inline local variable:
+```rust
+// before:
+fn foo() {
+    let a<|> = 1 + 1;
+    let b = a * 10;
+}
+// after:
+fn foo() {
+    let b = (1 + 1) * 10;
+}
+```
+- Remove `dbg!`
 ```rust
 // before:
diff --git a/editors/emacs/ra-emacs-lsp.el b/editors/emacs/ra-emacs-lsp.el
index 955703edb..84c018b66 100644
--- a/editors/emacs/ra-emacs-lsp.el
+++ b/editors/emacs/ra-emacs-lsp.el
@@ -159,7 +159,7 @@
  (interactive (list (rust-analyzer--select-runnable)))
  (-let (((&hash "env" "bin" "args" "label") runnable))
    (compilation-start
-     (string-join (cons bin args) " ")
+     (string-join (append (list bin) args '()) " ")
     ;; cargo-process-mode is nice, but try to work without it...
     (if (functionp 'cargo-process-mode) 'cargo-process-mode nil)
     (lambda (_) (concat "*" label "*")))