ref: 60f81e0f0e9e2d5e1ef3a7c2bbfbe6f288f989f6 dir: /tests/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; }