// 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); |