use log::*;

        assert!(c.cur - 1 < c.total);

        assert!(c.cur < c.total + 1);

    let s = L::offset_slice::<T, K, V>(page);

    let s = L::offset_slice::<T, K, V>(page);

            let (s0a, s0b) = s1.split_at(u as usize - k as usize);

            // debug!("{:?} {:?}", u, k);
            let (s0a, s0b) = s1.split_at(k as usize - u as usize);

            debug!("next = {:?}", next_page);

            put(&mut txn, &mut db, &(i * i), &(i * i * i)).unwrap();

            put(&mut txn, &mut db, &((i * i) % 1_000_000), &(i * i * i)).unwrap();

        for i in 0..n {
            debug!("put {:?}", i);
            put(&mut txn, &mut db, &((i * i) % 1_000_000), &(i * i * i)).unwrap();
        }