// expect: 0/
// spec 6.6
include rt;
struct node { int value; node* prev; node* next; };
fn main() {
	memdebug on;
	for (int round = 0; round < 50; round++) {
		node* a = rt.new(node);
		node* b = rt.new(node);
		a.next = b;
		b.prev = a;
		a.value = round;
		b.value = b.prev.value;
	}
	rt.put_n(rt.memreport()); rt.put_c(10);
}
// zc0: skip