class type['a]fs =object..end
method string_of_filename : 'a filename -> stringReturn a string representation of the filename. It is may not be a real host filename.
method open_out : ?mode:Stdlib.open_flag list ->
?perm:int -> 'a filename -> writer
method open_in : ?mode:Stdlib.open_flag list ->
?perm:int -> 'a filename -> reader
method file_exists : 'a filename -> bool
method remove : 'a filename -> unit