1 // RUN: %clang_cc1 -fsyntax-only -std=c++11 -verify %s
2 
3 using size_t = decltype(sizeof(int));
4 
5 template<typename T, typename U> struct same_type;
6 template<typename T> struct same_type<T, T> {};
7 template<typename T> using X = T;
8 template<typename CharT, X<CharT>...>
9 int operator "" _x(); // expected-warning {{string literal operator templates are a GNU extension}}
10 template<char...>
11 double operator "" _x();
12 
13 auto a="string"_x;
14 auto b=42_x;
15 same_type<decltype(a), int> test_a;
16 same_type<decltype(b), double> test_b;
17 
18 char operator "" _x(const char *begin, size_t size);
19 auto c="string"_x;
20 auto d=L"string"_x;
21 same_type<decltype(c), char> test_c;
22 same_type<decltype(d), int> test_d;
23