val mem : elt -> t -> bool
val remove : elt -> t -> t
val disjoint : t -> t -> bool
val compare : t -> t -> int
val equal : t -> t -> bool
val subset : t -> t -> bool
val iter : f:( elt -> unit ) -> t -> unit
val fold : f:( elt -> 'a -> 'a ) -> t -> init:'a -> 'a
val for_all : f:( elt -> bool ) -> t -> bool
val exists : f:( elt -> bool ) -> t -> bool
val filter : f:( elt -> bool ) -> t -> t
val filter_map : f:( elt -> elt option ) -> t -> t
val partition : f:( elt -> bool ) -> t -> t * t
val elements : t -> elt list
val min_elt_opt : t -> elt option
val max_elt_opt : t -> elt option
val choose_opt : t -> elt option
val split : elt -> t -> t * bool * t
val find_opt : elt -> t -> elt option
val find_first : f:( elt -> bool ) -> t -> elt
val find_first_opt : f:( elt -> bool ) -> t -> elt option
val find_last : f:( elt -> bool ) -> t -> elt
val find_last_opt : f:( elt -> bool ) -> t -> elt option
val of_list : elt list -> t
val to_seq_from : elt -> t -> elt Stdlib.Seq.t
val to_seq : t -> elt Stdlib.Seq.t
val to_rev_seq : t -> elt Stdlib.Seq.t
val add_seq : elt Stdlib.Seq.t -> t -> t
val of_seq : elt Stdlib.Seq.t -> t