debug!("err for {:?}", c);

            debug!("deleted: {:?}", e.introduced_by);

    for change_ in change.changes.iter().rev().flat_map(|r| r.rev_iter()) {
        match *change_ {
            Atom::EdgeMap(ref newedges) if newedges.edges[0].flag.contains(EdgeFlags::FOLDER) => {
                if newedges.edges[0].flag.contains(EdgeFlags::DELETED) {
                    let mut f = std::fs::File::create("debug_unrecord").unwrap();
                    crate::pristine::debug(txn, &channel, &mut f).unwrap();
                    working_copy::undo_file_deletion(txn, changes, channel, change_id, newedges)?
                } else {
                    working_copy::undo_file_reinsertion::<C, _>(txn, change_id, newedges)?
                }
            }
            Atom::NewVertex(ref new_vertex)
                if new_vertex.flag.contains(EdgeFlags::FOLDER)
                    && new_vertex.down_context.is_empty() =>
            {
                working_copy::undo_file_addition(txn, change_id, new_vertex)
                    .map_err(UnrecordError::Txn)?;
            }
            _ => {}
        }
    }

    }
    if new_vertex.flag.contains(EdgeFlags::FOLDER) && new_vertex.down_context.is_empty() {
        // let mut f = std::fs::File::create("debug_unrecord")?;
        // txn.debug(&channel, &mut f).unwrap();
        working_copy::undo_file_addition(txn, change_id, new_vertex).map_err(UnrecordError::Txn)?;

    if newedges.edges[0].flag.contains(EdgeFlags::FOLDER) {
        if newedges.edges[0].flag.contains(EdgeFlags::DELETED) {
            working_copy::undo_file_deletion(txn, changes, channel, change_id, newedges)?
        } else {
            working_copy::undo_file_reinsertion::<P, _>(txn, change_id, newedges)?
        }
    }