public Builder mergeScreenPosition(org.bwapi.proxy.messages.BasicTypes.Position value) {
        if (screenPositionBuilder_ == null) {
          if (((bitField0_ & 0x01000000) == 0x01000000) &&
              screenPosition_ != org.bwapi.proxy.messages.BasicTypes.Position.getDefaultInstance()) {
            screenPosition_ =
              org.bwapi.proxy.messages.BasicTypes.Position.newBuilder(screenPosition_).mergeFrom(value).buildPartial();
          } else {
            screenPosition_ = value;
          }
          onChanged();
        } else {
          screenPositionBuilder_.mergeFrom(value);
        }
        bitField0_ |= 0x01000000;
        return this;
      }