`sig type t val of_string : string -> t val to_string : t -> string val to_json : t -> OpamJson.t module Set : sig type elt = t type 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 module Map : sig type key = t type +'a t val empty : 'a t val is_empty : 'a t -> bool val mem : key -> 'a t -> bool val add : key -> 'a -> 'a t -> 'a t val singleton : key -> 'a -> 'a t val remove : key -> 'a t -> 'a t val merge : (key -> 'a option -> 'b option -> 'c option) -> 'a t -> 'b t -> 'c t val compare : ('a -> 'a -> int) -> 'a t -> 'a t -> int val equal : ('a -> 'a -> bool) -> 'a t -> 'a t -> bool val iter : (key -> 'a -> unit) -> 'a t -> unit val fold : (key -> 'a -> 'b -> 'b) -> 'a t -> 'b -> 'b val for_all : (key -> 'a -> bool) -> 'a t -> bool val exists : (key -> 'a -> bool) -> 'a t -> bool val filter : (key -> 'a -> bool) -> 'a t -> 'a t val partition : (key -> 'a -> bool) -> 'a t -> 'a t * 'a t val cardinal : 'a t -> int val bindings : 'a t -> (key * 'a) list val min_binding : 'a t -> key * 'a val max_binding : 'a t -> key * 'a val choose : 'a t -> key * 'a val split : key -> 'a t -> 'a t * 'a option * 'a t val find : key -> 'a t -> 'a val map : ('a -> 'b) -> 'a t -> 'b t val mapi : (key -> 'a -> 'b) -> 'a t -> 'b t val to_string : ('a -> string) -> 'a t -> string val to_json : ('a -> OpamJson.t) -> 'a t -> OpamJson.t val values : 'a t -> 'a list val keys : 'a t -> key list val union : ('a -> 'a -> 'a) -> 'a t -> 'a t -> 'a t val of_list : (key * 'a) list -> 'a t end val default : t val not_installed : t -> 'a end`