Language/Mixins/Mixin_Application/superinterfaces_t07.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.

/// @assertion Let S be a class, M be a mixin with required superinterfaces
/// T1, . . . , Tn, combined superinterface MS, implemented interfaces
/// I1, . . . , Ik and members as mixin member declarations, and let N be a name.
/// It is a compile-time error to apply M to S if S does not implement, directly
/// or indirectly, all of T1, . . . , Tn.
/// @description Checks that it is no error if M implements all its
/// superinterfaces
/// @author sgrekhov@unipro.ru

import "../../../Utils/expect.dart";

class A {
  int get a => 1;
}

class B extends A {
  int get b => 2;
}

mixin M on B {
  int get c => 3;
}

class S extends B {
  int get a => -1;
}

class C extends S with M {
  int get b => -2;
}

main() {
  C c = new C();
  Expect.equals(-1, c.a);
  Expect.equals(-2, c.b);
}