public Builder addUnits(
          int index, org.bwapi.proxy.messages.GameMessages.Unit.Builder builderForValue) {
        if (unitsBuilder_ == null) {
          ensureUnitsIsMutable();
          units_.add(index, builderForValue.build());
          onChanged();
        } else {
          unitsBuilder_.addMessage(index, builderForValue.build());
        }
        return this;
      }