`sig type elt = O.t type t = OpamMisc.Set.Make(O).t val empty : t val is_empty : t -> bool val mem : elt -> t -> bool val add : elt -> t -> t val singleton : elt -> t val remove : elt -> t -> t val union : t -> t -> t val inter : t -> t -> t val diff : t -> t -> t val compare : t -> t -> int val equal : t -> t -> bool val subset : t -> t -> bool val iter : (elt -> unit) -> t -> unit val fold : (elt -> 'a -> 'a) -> t -> 'a -> 'a val for_all : (elt -> bool) -> t -> bool val exists : (elt -> bool) -> t -> bool val filter : (elt -> bool) -> t -> t val partition : (elt -> bool) -> t -> t * t val cardinal : t -> int val elements : t -> elt list val min_elt : t -> elt val max_elt : t -> elt val choose : t -> elt val split : elt -> t -> t * bool * t val map : (elt -> elt) -> t -> t val choose_one : t -> elt val of_list : elt list -> t val to_string : t -> string val to_json : t -> OpamJson.t val find : (elt -> bool) -> t -> elt module Op : sig val ( ++ ) : t -> t -> t val ( -- ) : t -> t -> t val ( %% ) : t -> t -> t end end`