public Builder mergeSide1(org.bwapi.proxy.messages.BasicTypes.Position value) {
        if (side1Builder_ == null) {
          if (((bitField0_ & 0x00000008) == 0x00000008) &&
              side1_ != org.bwapi.proxy.messages.BasicTypes.Position.getDefaultInstance()) {
            side1_ =
              org.bwapi.proxy.messages.BasicTypes.Position.newBuilder(side1_).mergeFrom(value).buildPartial();
          } else {
            side1_ = value;
          }
          onChanged();
        } else {
          side1Builder_.mergeFrom(value);
        }
        bitField0_ |= 0x00000008;
        return this;
      }