`sig type key = T.t type 'a t = 'a Map.Make(T).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 union : (key -> 'a -> 'a -> 'a option) -> 'a t -> 'a t -> 'a 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 filter_map : 'a Identifiable.S.t -> f:(key -> 'a -> 'b option) -> 'b Identifiable.S.t val of_list : (key * 'a) list -> 'a Identifiable.S.t val disjoint_union : ?eq:('a -> 'a -> bool) -> 'a Identifiable.S.t -> 'a Identifiable.S.t -> 'a Identifiable.S.t val union_right : 'a Identifiable.S.t -> 'a Identifiable.S.t -> 'a Identifiable.S.t val union_left : 'a Identifiable.S.t -> 'a Identifiable.S.t -> 'a Identifiable.S.t val union_merge : ('a -> 'a -> 'a) -> 'a Identifiable.S.t -> 'a Identifiable.S.t -> 'a Identifiable.S.t val rename : key Identifiable.S.t -> key -> key val map_keys : (key -> key) -> 'a Identifiable.S.t -> 'a Identifiable.S.t val keys : 'a Identifiable.S.t -> Identifiable.S.Set.t val data : 'a Identifiable.S.t -> 'a list val of_set : (key -> 'a) -> Identifiable.S.Set.t -> 'a Identifiable.S.t val transpose_keys_and_data : key Identifiable.S.t -> key Identifiable.S.t val print : (Format.formatter -> 'a -> unit) -> Format.formatter -> 'a Identifiable.S.t -> unit end`