public Builder addHiddenUnits(
          org.bwapi.proxy.messages.GameMessages.UnitId.Builder builderForValue) {
        if (hiddenUnitsBuilder_ == null) {
          ensureHiddenUnitsIsMutable();
          hiddenUnits_.add(builderForValue.build());
          onChanged();
        } else {
          hiddenUnitsBuilder_.addMessage(builderForValue.build());
        }
        return this;
      }