<?hh // strict
/**
 * Copyright (c) 2014, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the "hack" directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 */

interface FormatString<T> { }
interface X { }

function f(FormatString<X> $fs, ...) : void {
}

function _(string $s) {
  f('%s');
}
