  int MaybePause() {
    CHECK_NE(execute_depth_, 0);

    if (!pending_pause_) {
      return 0;
    }

    pending_pause_ = false;
    llhttp_set_error_reason(&parser_, "Paused in callback");
    return HPE_PAUSED;
  }
  int MaybePause() {
    CHECK_NE(execute_depth_, 0);

    if (!pending_pause_) {
      return 0;
    }

    pending_pause_ = false;
    llhttp_set_error_reason(&parser_, "Paused in callback");
    return HPE_PAUSED;
  }