private static void checkInRange(Map<Seqno, Seqno> map, long seqno, long from, long to) {
Seqno val = map.get(new Seqno(seqno, true));
System.out.println("seqno=" + seqno + ", val = " + val);
assert val != null;
assert val.contains(seqno);
assert val.getLow() == from;
if (val instanceof SeqnoRange) assert ((SeqnoRange) val).getHigh() == to;
}
