Fs.Directorytype t = directoryval mkdir_p : t -> unitval of_string : string -> tval to_string : t -> stringval fold_files_rec_result : ?ext:string ->
('a -> file -> ('a, Or_error.msg) Or_error.result) -> 'a -> t -> ('a, [> Or_error.msg ]) Or_error.resultfold_files_rec_result ~ext f acc d recursively folds f over the files with extension matching ext (defaults to "") contained in d and its sub directories. Stop as soon as f returns Error _.