// expect: zy: index -1 out of range (length 2)/  at <stdin>:7 in main/
include rt;
void pn(int x) { rt.put_n(x); rt.put_c(10); }
fn main() {
	int[?] a = {1, 2};
	int i = 0 - 1;
	pn(a[i]);
	pn(99);
	return 0;
}
// zc0: skip