scc

 1#define XSTR(x) #x
 2#define STR(x)  XSTR(x)
 3#define S       y = "str"
 4
 5int
 6main()
 7{
 8	char *s, *t = STR(S);
 9
10	for (s = "y = \"str\""; *s && *t; ++s, ++t) {
11		if (*s != *t)
12			return 1;
13	}
14
15	return 0;
16}