public Builder setChokepoints(
          int index, org.bwapi.proxy.messages.TerrainMessages.Chokepoint.Builder builderForValue) {
        if (chokepointsBuilder_ == null) {
          ensureChokepointsIsMutable();
          chokepoints_.set(index, builderForValue.build());
          onChanged();
        } else {
          chokepointsBuilder_.setMessage(index, builderForValue.build());
        }
        return this;
      }