(**************************************************************************)
(*                                                                        *)
(*  Copyright (C) Jean-Christophe Filliatre                               *)
(*                                                                        *)
(*  This software is free software; you can redistribute it and/or        *)
(*  modify it under the terms of the GNU Library General Public           *)
(*  License version 2.1, with the special exception on linking            *)
(*  described in file LICENSE.                                            *)
(*                                                                        *)
(*  This software is distributed in the hope that it will be useful,      *)
(*  but WITHOUT ANY WARRANTY; without even the implied warranty of        *)
(*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.                  *)
(*                                                                        *)
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(*s This module implements {\em tries}. Given a map [M] over an
    arbitrary type [M.key], the following functor constructs a new map
    over type [M.key list]. *)

module type S = sig
  type key
  type +'a t
  val empty : 'a t
  val is_empty : 'a t -> bool
  val add : key -> 'a -> 'a t -> 'a t
  val find : key -> 'a t -> 'a
  val remove : key -> 'a t -> 'a t
  val mem : key -> 'a t -> bool
  val iter : (key -> 'a -> unit) -> 'a t -> unit
  val map : ('a -> 'b) -> 'a t -> 'b t
  val mapi : (key -> 'a -> 'b) -> 'a t -> 'b t
  val fold : (key -> 'a -> 'b -> 'b) -> 'a t -> 'b -> 'b
  val compare : ('a -> 'a -> int) -> 'a t -> 'a t -> int
  val equal : ('a -> 'a -> bool) -> 'a t -> 'a t -> bool
end

module Make(M : S) : (S with type key = M.key list)

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