ref: 2e8217b7eced5b5af1048a3ba7144c0adb5b46c2 dir: /tests/cc/execute/0109-struct.c/
struct S1 { int x; }; struct S2 { struct S1 s1; }; int main() { struct S2 s2; s2.s1.x = 1; return 0; }