Merge #3509

3509: Prevent include! macro include itself r=matklad a=edwin0cheng

This PR prevent `include` macro including itself. 

Note: It **does not** prevent a cyclic include: 
```rust
// foo.rs
include!("bar.rs")

// bar.rs
include!("foo.rs")
```

Co-authored-by: Edwin Cheng <[email protected]>

1 files changed, 18 insertions, 0 deletions

diff --git a/crates/ra_hir_ty/src/tests/macros.rs b/crates/ra_hir_ty/src/tests/macros.rs
index c86733ac3..ffa78b046 100644
--- a/crates/ra_hir_ty/src/tests/macros.rs
+++ b/crates/ra_hir_ty/src/tests/macros.rs
@@ -511,6 +511,24 @@ fn bar() -> u32 {0}
 }
 
 #[test]
+fn infer_builtin_macros_include_itself_should_failed() {
+    let (db, pos) = TestDB::with_position(
+        r#"
+//- /main.rs 
+#[rustc_builtin_macro]
+macro_rules! include {() => {}}
+
+include!("main.rs");
+
+fn main() {
+    0<|>
+}
+"#,
+    );
+    assert_eq!("i32", type_at_pos(&db, pos));
+}
+
+#[test]
 fn infer_builtin_macros_concat_with_lazy() {
     assert_snapshot!(
         infer(r#"