    sig
      type ('a, 'b) t = ('a, 'b) Hashtbl.t
      val create : int -> ('a, 'b) MoreLabels.Hashtbl.t
      val clear : ('a, 'b) MoreLabels.Hashtbl.t -> unit
      val add : ('a, 'b) MoreLabels.Hashtbl.t -> key:'a -> data:'b -> unit
      val copy : ('a, 'b) MoreLabels.Hashtbl.t -> ('a, 'b) MoreLabels.Hashtbl.t
      val find : ('a, 'b) MoreLabels.Hashtbl.t -> 'a -> 'b
      val find_all : ('a, 'b) MoreLabels.Hashtbl.t -> 'a -> 'b list
      val mem : ('a, 'b) MoreLabels.Hashtbl.t -> 'a -> bool
      val remove : ('a, 'b) MoreLabels.Hashtbl.t -> 'a -> unit
      val replace : ('a, 'b) MoreLabels.Hashtbl.t -> key:'a -> data:'b -> unit
      val iter :
        f:(key:'a -> data:'b -> unit) -> ('a, 'b) MoreLabels.Hashtbl.t -> unit
      val fold :
        f:(key:'a -> data:'b -> 'c -> 'c) ->
        ('a, 'b) MoreLabels.Hashtbl.t -> init:'c -> 'c
      module type HashedType = Hashtbl.HashedType
      module type S =
        sig
          type key
          and 'a t
          val create : int -> 'a MoreLabels.Hashtbl.S.t
          val clear : 'a MoreLabels.Hashtbl.S.t -> unit
          val copy : 'a MoreLabels.Hashtbl.S.t -> 'a MoreLabels.Hashtbl.S.t
          val add :
            'a MoreLabels.Hashtbl.S.t ->
            key:MoreLabels.Hashtbl.S.key -> data:'a -> unit
          val remove :
            'a MoreLabels.Hashtbl.S.t -> MoreLabels.Hashtbl.S.key -> unit
          val find : 'a MoreLabels.Hashtbl.S.t -> MoreLabels.Hashtbl.S.key -> 'a
          val find_all :
            'a MoreLabels.Hashtbl.S.t -> MoreLabels.Hashtbl.S.key -> 'a list
          val replace :
            'a MoreLabels.Hashtbl.S.t ->
            key:MoreLabels.Hashtbl.S.key -> data:'a -> unit
          val mem : 'a MoreLabels.Hashtbl.S.t -> MoreLabels.Hashtbl.S.key -> bool
          val iter :
            f:(key:MoreLabels.Hashtbl.S.key -> data:'a -> unit) ->
            'a MoreLabels.Hashtbl.S.t -> unit
          val fold :
            f:(key:MoreLabels.Hashtbl.S.key -> data:'a -> 'b -> 'b) ->
            'a MoreLabels.Hashtbl.S.t -> init:'b -> 'b
        end
      module Make :
        functor (H : HashedType) ->
          sig
            type key = H.t
            and 'a t
            val create : int -> 'a MoreLabels.Hashtbl.S.t
            val clear : 'a MoreLabels.Hashtbl.S.t -> unit
            val copy : 'a MoreLabels.Hashtbl.S.t -> 'a MoreLabels.Hashtbl.S.t
            val add :
              'a MoreLabels.Hashtbl.S.t ->
              key:MoreLabels.Hashtbl.S.key -> data:'a -> unit
            val remove :
              'a MoreLabels.Hashtbl.S.t -> MoreLabels.Hashtbl.S.key -> unit
            val find :
              'a MoreLabels.Hashtbl.S.t -> MoreLabels.Hashtbl.S.key -> 'a
            val find_all :
              'a MoreLabels.Hashtbl.S.t -> MoreLabels.Hashtbl.S.key -> 'a list
            val replace :
              'a MoreLabels.Hashtbl.S.t ->
              key:MoreLabels.Hashtbl.S.key -> data:'a -> unit
            val mem :
              'a MoreLabels.Hashtbl.S.t -> MoreLabels.Hashtbl.S.key -> bool
            val iter :
              f:(key:MoreLabels.Hashtbl.S.key -> data:'a -> unit) ->
              'a MoreLabels.Hashtbl.S.t -> unit
            val fold :
              f:(key:MoreLabels.Hashtbl.S.key -> data:'a -> 'b -> 'b) ->
              'a MoreLabels.Hashtbl.S.t -> init:'b -> 'b
          end
      val hash : 'a -> int
      external hash_param : int -> int -> 'a -> int = "hash_univ_param" "noalloc"
    end