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// Copyright (c) 2011, 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 implemented by a class.
/// @author ilya
class A implements Null {}
// ^
// [analyzer] unspecified
// [cfe] unspecified
main() {
A();
}