ref: d5ba7a743aa0a71de85332b403452fa3d498cb35
dir: /tests/cc/execute/0119-macrostr.c/
#define B "b"
char s[] = "a" B "c";
int
main()
{
if (s[0] != 'a')
return 1;
if (s[1] != 'b')
return 2;
if (s[2] != 'c')
return 3;
if (s[3] != '\0')
return 4;
return 0;
}