Language/Classes/Superclasses/superclass_of_itself_t04.dart

// Copyright (c) 2019, 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 if a class C is a superclass of itself.
 * @description Checks that it is a compile-time error if a class attempts to
 * extend itself indirectly, by transition. Test type aliases
 * @compile-error
 * @author sgrekhov@unipro.ru
 */
// SharedOptions=--enable-experiment=nonfunction-type-aliases

class A extends DAlias {}
class B extends A {}
class C extends B {}
class D extends C {}

typedef DAlias = D;

main() {
  new A();
}