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