module Hashtbl: sig .. end
val create : ?random:bool -> int -> ('a, 'b) t
val clear : ('a, 'b) t -> unit
val reset : ('a, 'b) t -> unit
val copy : ('a, 'b) t -> ('a, 'b) t
val add : ('a, 'b) t -> key:'a -> data:'b -> unit
val find : ('a, 'b) t -> 'a -> 'b
val find_all : ('a, 'b) t -> 'a -> 'b list
val mem : ('a, 'b) t -> 'a -> bool
val remove : ('a, 'b) t -> 'a -> unit
val replace : ('a, 'b) t -> key:'a -> data:'b -> unit
val iter : f:(key:'a -> data:'b -> unit) -> ('a, 'b) t -> unit
val fold : f:(key:'a -> data:'b -> 'c -> 'c) ->
('a, 'b) t -> init:'c -> 'c
val length : ('a, 'b) t -> int
val randomize : unit -> unit
module type S = sig .. end
val hash : 'a -> int
val seeded_hash : int -> 'a -> int
val hash_param : int -> int -> 'a -> int
val seeded_hash_param : int -> int -> int -> 'a -> int