pkg/front_end/test/fasta/mixin.dart

// Copyright (c) 2016, 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.

abstract class M1 {
  m() => print("M1");
}

abstract class M2 {
  m() => print("M2");
}

class C extends Object with M1, M2 {
}

main() {
  new C().m();
}