ref: b75c7d2fa8b3f9a8ba96e5a3035efa68b8d8cf85 dir: /tests/cc/execute/0019-selfrefstruct.c/
int main() { struct S { struct S *p; int x; } s; s.x = 0; s.p = &s; return s.p->p->p->p->p->x; }