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
467       CurrentDirIter = (*CurrentFS)->dir_begin(Path, EC);  in incrementFS()
506     CurrentDirIter = (*CurrentFS)->dir_begin(Path, EC);  in OverlayFSDirIterImpl()
515 directory_iterator OverlayFileSystem::dir_begin(const Twine &Dir,  in dir_begin()  function in OverlayFileSystem
933 directory_iterator InMemoryFileSystem::dir_begin(const Twine &Dir,  in dir_begin()  function in llvm::vfs::InMemoryFileSystem
1126 directory_iterator RedirectingFileSystem::dir_begin(const Twine &Dir,  in dir_begin()  function in RedirectingFileSystem
1132       return ExternalFS->dir_begin(Dir, EC);  in dir_begin()
2189     ExternalDirIter = ExternalFS.dir_begin(Dir, EC);  in incrementExternal()
2241   directory_iterator I = FS->dir_begin(Path, EC);  in recursive_directory_iterator()
2258       vfs::directory_iterator I = FS->dir_begin(State->Stack.top()->path(), EC);  in increment()