// 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.

// @dart = 2.9

/// @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 extends only one of the interfaces but not implemented
/// interface is not abstract
/// @author sgrekhov@unipro.ru


class B {
  String get gb1 => "B.gb1";
}
class C {
  String get gc1 => "C.gc1";
}

class A extends B {
  String get gc1 => "A.gc1";
}

mixin M on B, C {}

class MA extends A with M {
//                      ^
// [analyzer] unspecified
// [cfe] unspecified
}

main() {
  new MA();
}