tests/web/32828_test.dart

// Copyright (c) 2018, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

class A {
  void m2<T>(void Function(T)? f, [a]) {}
}

main() => new A().m2<String>(null);