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      1 // RUN: %clang_cc1 -fsyntax-only -std=c++11 -verify %s
      2 
      3 using size_t = decltype(sizeof(int));
      4 namespace std {
      5   struct string {};
      6 }
      7 
      8 template<typename T, typename U> struct same_type;
      9 template<typename T> struct same_type<T, T> {};
     10 
     11 namespace std_example {
     12 
     13 long double operator "" _w(long double);
     14 std::string operator "" _w(const char16_t*, size_t);
     15 unsigned operator "" _w(const char*);
     16 int main() {
     17   auto v1 = 1.2_w;    // calls operator "" _w(1.2L)
     18   auto v2 = u"one"_w; // calls operator "" _w(u"one", 3)
     19   auto v3 = 12_w;     // calls operator "" _w("12")
     20   "two"_w;            // expected-error {{no matching literal operator}}
     21 
     22   same_type<decltype(v1), long double> test1;
     23   same_type<decltype(v2), std::string> test2;
     24   same_type<decltype(v3), unsigned> test3;
     25 }
     26 
     27 }
     28