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"; 7 join(x, y); 8 9 #define FOO(x) A x B 10 // CHECK: A ## B; 11 FOO(##); 12