RsBundle  Diff

    ) -> Result<bool, Error<P::Err>> {
        let (update_tx, update_rx) = channel();
        problem
            .update(
                &UpdateData {
                    cur_y: &data.cur_y,
                    nxt_y: &itdata.nxt_y,
                    step: step,
                    master_proc: master_proc,
                    step,
                    master_proc,
                },
                itdata.cnt_iter,
                update_tx,
            )
            .map_err(Error::Update)?;

        let mut have_update = false;