Add a proc_macro_test crate

This exports all 3 kinds of proc macros and is useful for testing

2 files changed, 28 insertions, 0 deletions

diff --git a/crates/proc_macro_test/Cargo.toml b/crates/proc_macro_test/Cargo.toml
new file mode 100644
index 000000000..7b0f64f31
--- /dev/null
+++ b/crates/proc_macro_test/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "proc_macro_test"
+version = "0.0.0"
+license = "MIT OR Apache-2.0"
+authors = ["rust-analyzer developers"]
+edition = "2018"
+
+[lib]
+doctest = false
+proc-macro = true
diff --git a/crates/proc_macro_test/src/lib.rs b/crates/proc_macro_test/src/lib.rs
new file mode 100644
index 000000000..ec2a114a3
--- /dev/null
+++ b/crates/proc_macro_test/src/lib.rs
@@ -0,0 +1,18 @@
+//! Exports a few trivial procedural macros for testing.
+
+use proc_macro::TokenStream;
+
+#[proc_macro]
+pub fn function_like_macro(args: TokenStream) -> TokenStream {
+    args
+}
+
+#[proc_macro_attribute]
+pub fn attribute_macro(_args: TokenStream, item: TokenStream) -> TokenStream {
+    item
+}
+
+#[proc_macro_derive(DummyTrait)]
+pub fn derive_macro(_item: TokenStream) -> TokenStream {
+    TokenStream::new()
+}