(self.start.0).0,
            (self.end.0).0

            (self.start.0),
            (self.end.0)

            debug!("find_block_end: BLOCK ERROR 0");

            debug!("find_block_end: BLOCK ERROR 0 {:?}", e);

    for change_ in change.changes.iter() {
        debug!("Applying {:?} (1)", change_);

    for (n, change_) in change.changes.iter().enumerate() {
        debug!("Applying {} {:?} (1)", n, change_);

    debug!(
        "put new vertex, checking whether interval {:?} overlaps current graph",
        vertex
    );