private void ensureUpgradeLevelsIsMutable() {
        if (!((bitField0_ & 0x00080000) == 0x00080000)) {
          upgradeLevels_ = new java.util.ArrayList<org.bwapi.proxy.messages.GameMessages.UpgradeLevel>(upgradeLevels_);
          bitField0_ |= 0x00080000;
         }
      }