hphp/hack/test/typecheck/generic_optional_type.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 class Foo<T> {
  13   public function f1(T $x): void {
  14   }
  15 }
  16
  17 function f2(): Foo<?int> {
  18   $f = new Foo();
  19   $f->f1(null);
  20   return $f;
  21 }
  22