Error on self::class on non final classes

[hiphop-php.git] / hphp / hack / test / typecheck / mixed_option.php

<?hh // strict
/**
 * Copyright (c) 2014, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the "hack" directory of this source tree.
 *
 *
 */

async function f(): Awaitable<?mixed> {
  return null;
}