hphp/hack/test/typecheck/functional_higher_order2.php

   1 <?hh // strict
   2 /**
   3  * Copyright (c) 2014, Facebook, Inc.
   4  * All rights reserved.
   5  *
   6  * This source code is licensed under the MIT license found in the
   7  * LICENSE file in the "hack" directory of this source tree.
   8  *
   9  *
  10  */
  11
  12 function build<T>(T $x): (function(T): T) {
  13   return function(T $y): T use ($x) {
  14     return $y;
  15   };
  16 }