update_cur_sifted_state
err = update_cur_sifted_state (mctx, sctx, str_idx, &cur_dest);
err = update_cur_sifted_state (mctx, sctx, str_idx, &cur_dest);
static reg_errcode_t update_cur_sifted_state (const re_match_context_t *mctx,