ref: 3f1b3e7a7b4735ce4b796b174986d52dccdc1fa7 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; }