237   directory_iterator dir_begin(const Twine &Dir, std::error_code &EC) override;
335 directory_iterator RealFileSystem::dir_begin(const Twine &Dir,  in dir_begin()  function in RealFileSystem
422       CurrentDirIter = (*CurrentFS)->dir_begin(Path, EC);  in incrementFS()
461     CurrentDirIter = (*CurrentFS)->dir_begin(Path, EC);  in OverlayFSDirIterImpl()
470 directory_iterator OverlayFileSystem::dir_begin(const Twine &Dir,  in dir_begin()  function in OverlayFileSystem
889 directory_iterator InMemoryFileSystem::dir_begin(const Twine &Dir,  in dir_begin()  function in llvm::vfs::InMemoryFileSystem
1006 directory_iterator RedirectingFileSystem::dir_begin(const Twine &Dir,  in dir_begin()  function in RedirectingFileSystem
1012       return ExternalFS->dir_begin(Dir, EC);  in dir_begin()
1986     ExternalDirIter = ExternalFS.dir_begin(Dir, EC);  in incrementExternal()
2038   directory_iterator I = FS->dir_begin(Path, EC);  in recursive_directory_iterator()
2055       vfs::directory_iterator I = FS->dir_begin(State->Stack.top()->path(), EC);  in increment()