hphp/hack/test/typecheck/printf_opt_1.php

   1 <?hh // strict
   2 /**
   3  * Copyright (c) 2014, Facebook, Inc.
   4  * All rights reserved.
   5  *
   6  * This source code is licensed under the BSD-style license found in the
   7  * LICENSE file in the "hack" directory of this source tree. An additional grant
   8  * of patent rights can be found in the PATENTS file in the same directory.
   9  *
  10  */
  11
  12 newtype FormatString<T> = string;
  13
  14 interface Dummy {
  15   public function format_s(string $s) : string;
  16 }
  17
  18 function takesFS(?FormatString<Dummy> $f = null) : void {
  19 }
  20 function _() : void {
  21   takesFS();
  22   takesFS(null);
  23   takesFS('%s', 's');
  24 }