1 // RUN: %clang_cc1 -E %s | FileCheck -strict-whitespace %s
2 
3 #define hash_hash # ## #
4 #define mkstr(a) # a
5 #define in_between(a) mkstr(a)
6 #define join(c, d) in_between(c hash_hash d)
7 char p[] = join(x, y);
8 
9 // CHECK: char p[] = "x ## y";
10 
11