public Builder setRegions(
          int index, org.bwapi.proxy.messages.TerrainMessages.Region value) {
        if (regionsBuilder_ == null) {
          if (value == null) {
            throw new NullPointerException();
          }
          ensureRegionsIsMutable();
          regions_.set(index, value);
          onChanged();
        } else {
          regionsBuilder_.setMessage(index, value);
        }
        return this;
      }