/*
 * 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 An interface has a set of direct superinterfaces.
 * An interface J is a superinterface of an interface I iff either J is a
 * direct superinterface of I or J is a superinterface of a direct
 * superinterface of I.
 * @description Checks that it is a compile-time error if the chain of
 * superinterfaces forms a circular dependency.
 * @compile-error
 * @author vasya
 */

abstract class C implements A {}
abstract class B implements C {}
abstract class A implements B {}

class D implements A {}

main() {
  new D();
}