// 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 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 whose type is not subtype of M
 * from factory M.id produces a compile error. Test type alias
 * @compile-error
 * @author sgrekhov@unipro.ru
 */
// SharedOptions=--enable-experiment=nonfunction-type-aliases

abstract class I {}

class C implements I {}
typedef CAlaias = C;

class A implements I {
  factory A.foo() { return new CAlias(); }
}

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