// Copyright (c) 2019, 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 A { | |
void set x(Object? y); | |
} | |
class B implements A { | |
int? x; | |
} | |
main() { | |
new B().x = 5; | |
} |