public Builder mergeTargetPosition(org.bwapi.proxy.messages.BasicTypes.Position value) {
        if (targetPositionBuilder_ == null) {
          if (((bitField1_ & 0x00000002) == 0x00000002) &&
              targetPosition_ != org.bwapi.proxy.messages.BasicTypes.Position.getDefaultInstance()) {
            targetPosition_ =
              org.bwapi.proxy.messages.BasicTypes.Position.newBuilder(targetPosition_).mergeFrom(value).buildPartial();
          } else {
            targetPosition_ = value;
          }
          onChanged();
        } else {
          targetPositionBuilder_.mergeFrom(value);
        }
        bitField1_ |= 0x00000002;
        return this;
      }