Method AddLibrary

parser/parser.cc:1750–1760

  }

  absl::Status AddLibrary(cel::ParserLibrary library) override {
    if (!library.id.empty()) {
      auto [it, inserted] = library_ids_.insert(library.id);
      if (!inserted) {
        return absl::AlreadyExistsError(
            absl::StrCat("parser library already exists: ", library.id));
      }
    }
    libraries_.push_back(std::move(library));
    return absl::OkStatus();
  }

  absl::Status AddLibrarySubset(cel::ParserLibrarySubset subset) override {
    if (subset.library_id.empty()) {