1 files changed, 18 insertions, 0 deletions
diff --git a/test/CXX/lex/lex.literal/lex.ext/p8.cpp b/test/CXX/lex/lex.literal/lex.ext/p8.cpp
new file mode 100644
index 000000000000..d9078221ff5e
--- /dev/null
+++ b/test/CXX/lex/lex.literal/lex.ext/p8.cpp
@@ -0,0 +1,18 @@
+// RUN: %clang_cc1 -std=c++11 -verify %s
+
+using size_t = decltype(sizeof(int));
+constexpr const char *operator "" _id(const char *p, size_t) { return p; }
+constexpr const char *s = "foo"_id "bar" "baz"_id "quux";
+
+constexpr bool streq(const char *p, const char *q) {
+  return *p == *q && (!*p || streq(p+1, q+1));
+}
+static_assert(streq(s, "foobarbazquux"), "");
+
+constexpr const char *operator "" _trim(const char *p, size_t n) {
+  return *p == ' ' ? operator "" _trim(p + 1, n - 1) : p;
+}
+constexpr const char *t = "   " " "_trim "  foo";
+static_assert(streq(t, "foo"), "");
+
+const char *u = "foo" "bar"_id "baz" "quux"_di "corge"; // expected-error {{differing user-defined suffixes ('_id' and '_di') in string literal concatenation}}