282   directory_iterator dir_begin(const Twine &Dir, std::error_code &EC) override;
419 directory_iterator RealFileSystem::dir_begin(const Twine &Dir,  in dir_begin()  function in RealFileSystem
581       directory_iterator Iter = FS->dir_begin(Dir, FEC);  in CombiningDirIterImpl()
603 directory_iterator OverlayFileSystem::dir_begin(const Twine &Dir,  in dir_begin()  function in OverlayFileSystem
1145 directory_iterator InMemoryFileSystem::dir_begin(const Twine &Dir,  in dir_begin()  function in llvm::vfs::InMemoryFileSystem
1426 directory_iterator RedirectingFileSystem::dir_begin(const Twine &Dir,  in dir_begin()  function in RedirectingFileSystem
1439       return ExternalFS->dir_begin(Path, EC);  in dir_begin()
1450       return ExternalFS->dir_begin(Dir, EC);  in dir_begin()
1467     RedirectIter = ExternalFS->dir_begin(*ExtRedirect, RedirectEC);  in dir_begin()
1496   directory_iterator ExternalIter = ExternalFS->dir_begin(Path, ExternalEC);  in dir_begin()
2913   directory_iterator I = FS->dir_begin(Path, EC);  in recursive_directory_iterator()
2931           FS->dir_begin(State->Stack.back()->path(), EC);  in increment()