// 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 A mixin declaration introduces a mixin and an interface, but not a
/// class.
///
/// @description Checks that a mixin declaration introduces an interface and
/// therefore it cannot be extended.
/// @author sgrekhov@unipro.ru


class C {
}

mixin M on C {
}

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

main() {
  MA m = new MA();
}