pkg/front_end/testcases/runtime_checks/covariant_keyword_setter.dart

// 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.
// @dart=2.9
/*@testedFeatures=checks*/
library test;

class C {
  void set x(num value) {}
}

class D extends C {
  void set x(covariant int value) {}
}

class E extends D {
  void set x(int value) {}
}

main() {}