Language/Types/Interface_Types/direct_supertype_t01.dart

// 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 The implicit interface of class I is a direct supertype of the
/// implicit interface of class J iff:
/// • If I is Object, and J has no extends clause
/// • If I is listed in the extends clause of J.
/// • If I is listed in the implements clause of J
/// • If I is listed in the with clause of J
/// • If J is a mixin application of the mixin of I.
/// @description Checks that Object is a supertype of an an implicit interface
/// of a class declared without extends clause.
/// @author iefremov

import "../../../Utils/expect.dart";

class J {}

main() {
  Expect.isTrue(new J() is Object);
}