1 files changed, 1 insertions, 0 deletions

diff --git a/crates/ra_mbe/src/tests.rs b/crates/ra_mbe/src/tests.rs
index cb228702f..1dba82915 100644
--- a/crates/ra_mbe/src/tests.rs
+++ b/crates/ra_mbe/src/tests.rs
@@ -23,6 +23,7 @@ mod rule_parsing {
         check("($($i:ident)*) => ($_)");
         check("($($true:ident)*) => ($true)");
         check("($($false:ident)*) => ($false)");
+        check("($) => ($)");
     }
 
     #[test]