diff --git a/tests/source/macros.rs b/tests/source/macros.rs
index 07934255bacd..29d8f0661268 100644
--- a/tests/source/macros.rs
+++ b/tests/source/macros.rs
@@ -466,3 +466,8 @@ static ROOTED_TRACEABLES: RefCell<RootedTraceableSet> =
         RefCell::new(RootedTraceableSet::new(1234)) ;
 
 ] ;
+
+fn issue3004() {
+    foo!(|_| { (  ) });
+    stringify!(( foo+ ));
+}
diff --git a/tests/target/macros.rs b/tests/target/macros.rs
index 061d1746422b..bc15a86cf349 100644
--- a/tests/target/macros.rs
+++ b/tests/target/macros.rs
@@ -1043,3 +1043,8 @@ thread_local![
     static ROOTED_TRACEABLES: RefCell<RootedTraceableSet> =
         RefCell::new(RootedTraceableSet::new(1234));
 ];
+
+fn issue3004() {
+    foo!(|_| { () });
+    stringify!((foo+));
+}