p8.cpp revision 9fcce65e7e1307b5b8da9be13e4092d6bb94dc1d 
1// RUN: %clang_cc1 -std=c++11 -verify %s
2
3using size_t = decltype(sizeof(int));
4constexpr const char *operator "" _id(const char *p, size_t) { return p; }
5constexpr const char *s = "foo"_id "bar" "baz"_id "quux";
6
7constexpr bool streq(const char *p, const char *q) {
8  return *p == *q && (!*p || streq(p+1, q+1));
9}
10static_assert(streq(s, "foobarbazquux"), "");
11
12constexpr const char *operator "" _trim(const char *p, size_t n) {
13  return *p == ' ' ? operator "" _trim(p + 1, n - 1) : p;
14}
15constexpr const char *t = "   " " "_trim "  foo";
16static_assert(streq(t, "foo"), "");
17
18const char *u = "foo" "bar"_id "baz" "quux"_di "corge"; // expected-error {{differing user-defined suffixes ('_id' and '_di') in string literal concatenation}}
19