rack_clone_rsm
rack_clone_rsm(rack, nrsm, rsm, rack->r_ctl.last_collapse_point);
rack_clone_rsm(rack, nrsm, rsm,
rack_clone_rsm(rack, nrsm, rsm, c_end);
rack_clone_rsm(rack, nrsm, rsm, seq_out);
rack_clone_rsm(rack, nrsm, rsm, start);
rack_clone_rsm(rack, nrsm, rsm, end);