ref: 4886e44d6ea86d65f31eb6ecbfa8f82cac9c2fa0 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; }