Add a proc_macro_test crate

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

Cargo.lock

@@ -1097,12 +1097,17 @@ dependencies = [
  "mbe",
  "memmap",
  "proc_macro_api",
+ "proc_macro_test",
  "serde_derive",
  "test_utils",
  "toolchain",
  "tt",
 ]
 
+[[package]]
+name = "proc_macro_test"
+version = "0.0.0"
+
 [[package]]
 name = "profile"
 version = "0.0.0"

crates/proc_macro_srv/Cargo.toml

@@ -21,7 +21,9 @@ test_utils = { path = "../test_utils" }
 [dev-dependencies]
 cargo_metadata = "0.11.1"
 difference = "2.0.0"
-# used as proc macro test target
+
+# used as proc macro test targets
 serde_derive = "1.0.106"
+proc_macro_test = { path = "../proc_macro_test" }
 
 toolchain = { path = "../toolchain" }

crates/proc_macro_srv/src/tests/mod.rs

@@ -35,7 +35,7 @@ SUBTREE $
 
 #[test]
 fn test_derive_proc_macro_list() {
-    let res = list("serde_derive", "1.0").join("\n");
+    let res = list("serde_derive", "1").join("\n");
 
     assert_eq_text!(
         &res,
@@ -43,3 +43,16 @@ fn test_derive_proc_macro_list() {
 Deserialize [CustomDerive]"#
     );
 }
+
+/// Tests that we find and classify non-derive macros correctly.
+#[test]
+fn list_test_macros() {
+    let res = list("proc_macro_test", "0.0.0").join("\n");
+
+    assert_eq_text!(
+        &res,
+        r#"function_like_macro [FuncLike]
+attribute_macro [Attr]
+DummyTrait [CustomDerive]"#
+    );
+}

crates/proc_macro_srv/src/tests/utils.rs

@@ -13,7 +13,7 @@ mod fixtures {
     // Use current project metadata to get the proc-macro dylib path
     pub fn dylib_path(crate_name: &str, version: &str) -> std::path::PathBuf {
         let command = Command::new(toolchain::cargo())
-            .args(&["check", "--message-format", "json"])
+            .args(&["check", "--tests", "--message-format", "json"])
             .output()
             .unwrap()
             .stdout;

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

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()
+}