diff --git a/tests/ui/ty_fn_sig.rs b/tests/ui/ty_fn_sig.rs
index b6f9e645d..9e2753dcb 100644
--- a/tests/ui/ty_fn_sig.rs
+++ b/tests/ui/ty_fn_sig.rs
@@ -6,4 +6,9 @@ pub fn retry<F: Fn()>(f: F) {
     }
 }
 
-fn main() {}
+fn main() {
+    for y in 0..4 {
+        let func = || ();
+        func();
+    }
+}