private void ensureStaticNeutralUnitsIsMutable() {
        if (!((bitField0_ & 0x00000004) == 0x00000004)) {
          staticNeutralUnits_ = new java.util.ArrayList<org.bwapi.proxy.messages.GameMessages.UnitId>(staticNeutralUnits_);
          bitField0_ |= 0x00000004;
         }
      }