1 // { dg-do compile { target c++11 } }
2 
3 template <typename _Tp, _Tp __v> struct A { static constexpr _Tp value = __v; };
4 typedef A<bool, false> false_type;
5 struct is_same : false_type {};
6 template <bool> struct enable_if;
7 template <typename> using __remove_cvref_t = int;
8 template <typename _Tp> class reference_wrapper {
9   static _Tp _S_fun();
10   template <typename _Up, typename = __remove_cvref_t<_Up>>
11   using __not_same = enable_if<is_same::value>;
12 
13 public:
14   template <typename _Up, typename = __not_same<_Up>>
15   reference_wrapper(_Up) noexcept(noexcept(reference_wrapper::_S_fun));
16 };
17 
fn1()18 reference_wrapper<int> fn1() {
19   int __t = 10;
20   return __t;
21 }
22