scc

 1struct S1 {
 2	int a;
 3	int b;
 4};
 5
 6struct S2 {
 7	int a;
 8	int b;
 9	union {
10		int c;
11		int d;
12	};
13	struct S1 s;
14};
15
16struct S2 v = {1, 2, 3, {4, 5}};
17
18int
19main()
20{
21	if(v.a != 1)
22		return 1;
23	if(v.b != 2)
24		return 2;
25	if(v.c != 3 || v.d != 3)
26		return 3;
27	if(v.s.a != 4)
28		return 4;
29	if(v.s.b != 5)
30		return 5;
31	
32	return 0;
33}