ref: d0a1eae3c5e2d9b4fd2dd6d8727d882f24d4a4ef dir: /tests/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; }