test/Preprocessor/c99-6_10_3_3_p4.c


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// RUN: clang -E %s | grep -F 'char p[] = "x ## y";'
#define hash_hash # ## # 
#define mkstr(a) # a 
#define in_between(a) mkstr(a) 
#define join(c, d) in_between(c hash_hash d) 
char p[] = join(x, y);