transit_state_bkref
err = transit_state_bkref (mctx, &cur_state->nodes);
static reg_errcode_t transit_state_bkref (re_match_context_t *mctx,
*err = transit_state_bkref (mctx, &next_state->nodes);
err = transit_state_bkref (mctx, new_dest_nodes);