257   directory_iterator dir_begin(const Twine &Dir, std::error_code &EC) override;
378 directory_iterator RealFileSystem::dir_begin(const Twine &Dir,  in dir_begin()  function in RealFileSystem
474       CurrentDirIter = FSList.back()->dir_begin(DirPath, EC);  in incrementFS()
516       CurrentDirIter = FSList.back()->dir_begin(DirPath, EC);  in CombiningDirIterImpl()
536 directory_iterator OverlayFileSystem::dir_begin(const Twine &Dir,  in dir_begin()  function in OverlayFileSystem
954 directory_iterator InMemoryFileSystem::dir_begin(const Twine &Dir,  in dir_begin()  function in llvm::vfs::InMemoryFileSystem
1192 directory_iterator RedirectingFileSystem::dir_begin(const Twine &Dir,  in dir_begin()  function in RedirectingFileSystem
1205       return ExternalFS->dir_begin(Path, EC);  in dir_begin()
1213       return ExternalFS->dir_begin(Dir, EC);  in dir_begin()
1228     DirIter = ExternalFS->dir_begin(*ExtRedirect, EC);  in dir_begin()
2340   directory_iterator I = FS->dir_begin(Path, EC);  in recursive_directory_iterator()
2357       vfs::directory_iterator I = FS->dir_begin(State->Stack.top()->path(), EC);  in increment()