272   directory_iterator dir_begin(const Twine &Dir, std::error_code &EC) override;
408 directory_iterator RealFileSystem::dir_begin(const Twine &Dir,  in dir_begin()  function in RealFileSystem
555       directory_iterator Iter = FS->dir_begin(Dir, FEC);  in CombiningDirIterImpl()
577 directory_iterator OverlayFileSystem::dir_begin(const Twine &Dir,  in dir_begin()  function in OverlayFileSystem
1122 directory_iterator InMemoryFileSystem::dir_begin(const Twine &Dir,  in dir_begin()  function in llvm::vfs::InMemoryFileSystem
1385 directory_iterator RedirectingFileSystem::dir_begin(const Twine &Dir,  in dir_begin()  function in RedirectingFileSystem
1398       return ExternalFS->dir_begin(Path, EC);  in dir_begin()
1409       return ExternalFS->dir_begin(Dir, EC);  in dir_begin()
1426     RedirectIter = ExternalFS->dir_begin(*ExtRedirect, RedirectEC);  in dir_begin()
1455   directory_iterator ExternalIter = ExternalFS->dir_begin(Path, ExternalEC);  in dir_begin()
2761   directory_iterator I = FS->dir_begin(Path, EC);  in recursive_directory_iterator()
2778       vfs::directory_iterator I = FS->dir_begin(State->Stack.top()->path(), EC);  in increment()