public Builder clearNydusExit() {
        if (nydusExitBuilder_ == null) {
          nydusExit_ = org.bwapi.proxy.messages.GameMessages.UnitId.getDefaultInstance();
          onChanged();
        } else {
          nydusExitBuilder_.clear();
        }
        bitField1_ = (bitField1_ & ~0x01000000);
        return this;
      }