c99-6_10_3_3_p4.c « Preprocessor « test - clang/clang.git - (deprecated) Vendor branches of https://git.llvm.org/git/clang.git , use clang/llvm-project instead.

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// RUN: %clang_cc1 -E %s | FileCheck -strict-whitespace %s

#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);

// CHECK: char p[] = "x ## y";