ref: 4c09eaec1c1f81e175b6e8b6266e8a2c9aa7afaa 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; }