1// RUN: %clang_cc1 -E %s | FileCheck %s
2#define hash_hash # ## #
3#define mkstr(a) # a
4#define in_between(a) mkstr(a)
5#define join(c, d) in_between(c hash_hash d)
6// CHECK: "x ## y";
7join(x, y);
8
9#define FOO(x) A x B
10// CHECK: A ## B;
11FOO(##);
12