check_mismatch
#define check_mismatch(x, untouched, shuffled) \
#undef check_mismatch
#define check_mismatch(x, ignore) \
#undef check_mismatch
#define check_mismatch(x, ignore) \
#undef check_mismatch
#define check_mismatch(x, ignore) \
#undef check_mismatch