public Builder mergePos(org.bwapi.proxy.messages.BasicTypes.Position value) {
        if (posBuilder_ == null) {
          if (((bitField0_ & 0x00000004) == 0x00000004) &&
              pos_ != org.bwapi.proxy.messages.BasicTypes.Position.getDefaultInstance()) {
            pos_ =
              org.bwapi.proxy.messages.BasicTypes.Position.newBuilder(pos_).mergeFrom(value).buildPartial();
          } else {
            pos_ = value;
          }
          onChanged();
        } else {
          posBuilder_.mergeFrom(value);
        }
        bitField0_ |= 0x00000004;
        return this;
      }