// Copyright (c) 2016, 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.md file.
// @dart=2.9
class Foo {
  Foo() = Bar;
}

class Bar extends Foo {
  factory Bar() => null;
}

main() {
  new Foo();
}