code: public boolean isPopulatedWithFileOverview() {
      return isPopulated() &&
          (currentInfo.hasFileOverview() || currentInfo.isExterns() ||
           currentInfo.isNoCompile() || currentInfo.isTypeSummary());
    }
docs: Returns whether this builder is populated with information that can be
  used to {@link #build} a {@link JSDocInfo} object that has a
  fileoverview tag.