// expect: el/he/lo//0//
include rt;
void pn(int x) { rt.put_n(x); rt.put_c(10); }
fn main() {
	bstr t = b"hello";
	rt.put_s(t[1:3]); rt.put_c(10);
	rt.put_s(t[-5:2]); rt.put_c(10);
	rt.put_s(t[3:100]); rt.put_c(10);
	bstr e = t[4:2];
	rt.put_s(e); rt.put_c(10);
	pn(len(e));
	rt.put_s(t[2:2]); rt.put_c(10);
	return 0;
}