message: Avoid copy in range-for loop
diff: @@ -205,7 +205,7 @@ absl::StatusOr<Directory> ListDir(absl::string_view dir) {
  return absl::InvalidArgumentError(absl::StrCat(dir, ": not a directory"));
  }
  - for (const fs::directory_entry entry : fs::directory_iterator(d.path)) {
  + for (const fs::directory_entry &entry : fs::directory_iterator(d.path)) {
  const std::string entry_name = entry.path().string();
  if (entry.is_directory()) {
  d.directories.push_back(entry_name);
  