scc

 1struct S *x;
 2struct S {
 3	int i;
 4	struct S *next;
 5};
 6
 7int
 8main(void)
 9{
10	struct S y, *p;
11	unsigned n;
12
13	y.i = 0;
14	y.next = 0;
15	x = &y;
16	*x = y;
17
18	for (n = 0, p = &y; p; ++n, p = p->next)
19		;
20	return n-1;
21}