module Array : sig val set : 'a array -> int -> 'a -> unit end
module Hashtbl :
  sig
    type ('a, 'b) t = ('a, 'b) Fcl_data.Hashtbl.t
    val create : int -> ('a, 'b) t
    val get : ('a, 'b) t -> ('a, 'b) Hashtbl.t
    val add : ('a, 'b) t -> 'a -> 'b -> unit
    val find : ('a, 'b) t -> 'a -> 'b
    val mem : ('a, 'b) t -> 'a -> bool
    val remove : ('a, 'b) t -> 'a -> unit
    val replace : ('a, 'b) t -> 'a -> 'b -> unit
    val iter : ('a -> 'b -> unit) -> ('a, 'b) t -> unit
    val fold : ('a -> 'b -> 'c -> 'c) -> ('a, 'b) t -> 'c -> 'c
  end