// 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 error if a factory returns a non-null object whose
/// type is not a subtype of its actual return type.
/// @description Checks that returning an object of subtype of M
/// from factory constructor M does not produce an error.
/// @author kaigorodov


abstract class A {
  A();
  factory A.f() => new C();
}

class C extends A {}

main() {
  new A.f();
}