// Copyright (c) 2015, 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 It is a compile-time error for a class to
/// attempt to extend, mix in or implement Null.
/// @description Checks that Null cannot be mixed in abstract class
/// @author sgrekhov@unipro.ru


class A {}

abstract class C extends A with Null {}
//                              ^
// [analyzer] unspecified
// [cfe] unspecified

main() {
 C;
}