ref: d53908d15cd69c4a34def3865062f6746b9bb4a9
dir: /tests/cc/execute/0153-cpp-string.c/
#define M1(x) "This is a string $ or # or ## " ## #x
#define STR "This is a string $ or # or ## and it is ok!"
int
main(void)
{
char *s, *t = M1(and it is ok!);
for (s = STR; *s && *s == *t; ++s)
++t;
return *s;
}