scc

 1#define _PROTOTYPE(x, y) x y
 2
 3_PROTOTYPE(int fun, (char *s, int n, const char *format,
 4                                                  char *arg)    );
 5_PROTOTYPE(int fun, (char *s, int n, const char *format, char *arg)    );
 6_PROTOTYPE(int fun, (char *s, int n, const char *format, char
 7	*arg)    );
 8
 9int
10fun(char *s, int n, const char *format, char *arg)
11{
12	return 0;
13}
14
15int
16main()
17{
18	return fun(0, 0, 0, 0);
19}