scc

 1struct s {
 2    int x;
 3    struct {
 4        int y;
 5        int z;
 6    } nest;
 7};
 8
 9int
10main() {
11    struct s v;
12    v.x = 1;
13    v.nest.y = 2;
14    v.nest.z = 3;
15    if (v.x + v.nest.y + v.nest.z != 6)
16        return 1;
17    return 0;
18}
19