/*
 * 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 double.
 * @description Checks that a user-defined interface cannot extend double.
 * @compile-error
 * @author iefremov
 */

abstract class A extends double {}

class B implements A {}

main() {
  new B();
}