LanguageFeatures/Super-mixins/implementation_t04.dart

/*
 * Copyright (c) 2018, 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 In a mixin declaration like
 * mixin A<X extends S, Y extends T> on B, C implements D, E { body }
 * the on clause declares the interfaces B and C as super-class constraints of
 * the mixin. Having a super-class constaint allows the mixin declaration
 * instance members to perform super-invocations (like super.foo()) if they are
 * allowed by a class implementing both B and C. The mixin introduced by A can
 * then only be applied to classes that implement both B and C.
 *
 * @description Checks that mixin declaration can only be applied to classes
 * that implement both B and C. Test the case when mixin declaration is applied
 * to the class with implements only one of the interfaces but not implemented
 * interface is not abstract
 * @compile-error
 * @author sgrekhov@unipro.ru
 */

abstract class B {
  int get gb1;
}
class C {
  int get gc1 => 2;
}

class A implements B {
  int get gb1 => 1;
  int get gc1 => 2;
}

mixin M on B, C {}

class MA extends A with M {
}

main() {
  new MA();
}