scc

 1struct f {
 2	char fill[40];
 3	int a;
 4};
 5
 6struct f
 7f1(struct f a)
 8{
 9	a.a += 2;
10	return a;
11}
12
13struct f
14f2(struct f a)
15{
16	struct f b;
17
18	b.a = a.a + 2;
19	return b;
20}
21
22int
23main()
24{
25	struct f a, b;
26
27	a.a = 1;
28	b = f1(a);
29	if (b.a != a.a + 2)
30		return 1;
31	b = f2(a);
32	if (b.a != a.a + 2)
33		return 2;
34
35	return 0;
36}