Special case for empty comments

1 files changed, 13 insertions, 0 deletions

diff --git a/crates/ra_mbe/src/tests.rs b/crates/ra_mbe/src/tests.rs
index 100ed41f2..364dcc3c3 100644
--- a/crates/ra_mbe/src/tests.rs
+++ b/crates/ra_mbe/src/tests.rs
@@ -1849,3 +1849,16 @@ fn test_expand_bad_literal() {
     )
     .assert_expand_err(r#"foo!(&k");"#, &ExpandError::BindingError("".into()));
 }
+
+#[test]
+fn test_empty_comments() {
+    parse_macro(
+        r#"
+        macro_rules! one_arg_macro { ($fmt:expr) => (); }        
+    "#,
+    )
+    .assert_expand_err(
+        r#"one_arg_macro!(/**/)"#,
+        &ExpandError::BindingError("expected Expr".into()),
+    );
+}