re_acquire_state
dst[st_idx] = re_acquire_state (&err, dfa, &merged_set);
sctx->sifted_states[str_idx] = re_acquire_state (&err, dfa, dest_nodes);
re_dfastate_t *state = re_acquire_state (&err, dfa, dest_nodes);
mctx->state_log[next_idx] = re_acquire_state (&err, dfa,
mctx->state_log[to_idx] = re_acquire_state (&err, dfa, &union_set);