Topkg_os.Fileval null : Topkg_fpath.tval dash : Topkg_fpath.tval exists : Topkg_fpath.t -> bool Topkg_result.resultval must_exist : Topkg_fpath.t -> Topkg_fpath.t Topkg_result.resultval delete : ?must_exist:bool -> Topkg_fpath.t -> unit Topkg_result.resultval fold : ?skip:(Topkg_fpath.t -> bool) -> (Topkg_fpath.t -> 'a -> 'a) -> 'a -> Topkg_fpath.t list -> 'a Topkg_result.resultval read : Topkg_fpath.t -> string Topkg_result.resultval write : Topkg_fpath.t -> string -> unit Topkg_result.resultval write_subst : Topkg_fpath.t -> (string * string) list -> string -> unit Topkg_result.resultval tmp : unit -> Topkg_fpath.t Topkg_result.result