ref: 38d360b9a0c73d60a5e8e8df65854c53d6f145f5 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; }