#define noreturn __attribute__((noreturn))
-void die(const char *, ...) __attribute__((format(printf, 1, 2))) noreturn;
+void die(const char *, ...) noreturn;
char *mprintf(const char *, ...)
__attribute__ ((format (printf, 1, 2)));
void *xcalloc(size_t, size_t);