ref: c1b4b8354a76cc8c9aa13757e8b3db8d1b5a7c39 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; }