// Copyright (c) 2017, 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.

/*@testedFeatures=checks*/
library test;

class C<T> {
  void set x(T? t) {}
  T? y;
}

class D implements C<num> {
  num? x;
  num? y;
}

class E implements C<num> {
  void set x(num? t) {}
  num? get y => null;
  void set y(num? t) {}
}

void main() {}