RsBundle  Diff

                    &newvars.iter().map(|v| (v.0, v.1, v.2)).collect::<Vec<_>>(),
                    &mut |fidx, minidx, vars| {
                        problem
                            .extend_subgradient(minorants[fidx][minidx].primal.as_ref().unwrap(), vars)
                            .map(DVector)
                            .map_err(|e| e.into())
                    },
                )
                .map_err(SolverError::Master)?;
                ).map_err(SolverError::Master)?;
            // modify moved variables
            for (index, val) in newvars.iter().filter_map(|v| v.0.map(|i| (i, v.3))) {
                self.cur_y[index] = val;
                self.nxt_y[index] = val;
                self.nxt_d[index] = 0.0;
            }
            // add new variables