mbe: fix token conversion for doc comments

crates/ide/src/goto_definition.rs

@@ -850,6 +850,32 @@ fn foo() {}
         );
     }
 
+    #[test]
+    fn goto_through_included_file_struct_with_doc_comment() {
+        check(
+            r#"
+//- /main.rs
+#[rustc_builtin_macro]
+macro_rules! include {}
+
+include!("foo.rs");
+
+fn f() {
+    let x = Foo$0;
+}
+
+mod confuse_index {
+    pub struct Foo;
+}
+
+//- /foo.rs
+/// This is a doc comment
+pub struct Foo;
+         //^^^
+        "#,
+        );
+    }
+
     #[test]
     fn goto_for_type_param() {
         check(