// 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 constructor M produces a compile error. Test type alias
/// @author sgrekhov@unipro.ru

// SharedOptions=--enable-experiment=nonfunction-type-aliases

class C {}
typedef CAlias = C;

class A extends C {
  factory A() => CAlias();
//               ^
// [analyzer] unspecified
// [cfe] unspecified
}

main() {
  A();
}