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-(************************************************************************)
-(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
-(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2017     *)
-(*   \VV/  **************************************************************)
-(*    //   *      This file is distributed under the terms of the       *)
-(*         *       GNU Lesser General Public License Version 2.1        *)
-(************************************************************************)
-
-(** An imperative implementation of partitions via Union-Find *)
-
-(** Paths are compressed imperatively at each lookup of a
-    canonical representative. Each union also modifies in-place
-    the partition structure.
-
-    Nota: for the moment we use Pervasive's comparison for
-    choosing the smallest object as representative. This could
-    be made more generic.
-*)
-
-module type PartitionSig = sig
-
-  (** The type of elements in the partition *)
-  type elt
-
-  (** A set structure over elements *)
-  type set
-
-  (** The type of partitions *)
-  type t
-
-  (** Initialise an empty partition *)
-  val create : unit -> t
-
-  (** Add (in place) an element in the partition, or do nothing
-      if the element is already in the partition. *)
-  val add : elt -> t -> unit
-
-  (** Find the canonical representative of an element.
-      Raise [not_found] if the element isn't known yet. *)
-  val find : elt -> t -> elt
-
-  (** Merge (in place) the equivalence classes of two elements.
-      This will add the elements in the partition if necessary. *)
-  val union : elt -> elt -> t -> unit
-
-  (** Merge (in place) the equivalence classes of many elements. *)
-  val union_set : set -> t -> unit
-
-  (** Listing the different components of the partition *)
-  val partition : t -> set list
-
-end
-
-module type SetS =
-sig
-  type t
-  type elt
-  val singleton : elt -> t
-  val union : t -> t -> t
-  val choose : t -> elt
-  val iter : (elt -> unit) -> t -> unit
-end
-(** Minimal interface for sets, subtype of stdlib's Set. *)
-
-module type MapS =
-sig
-  type key
-  type +'a t
-  val empty : 'a t
-  val find : key -> 'a t -> 'a
-  val add : key -> 'a -> 'a t -> 'a t
-  val mem : key -> 'a t -> bool
-  val fold : (key -> 'a -> 'b -> 'b) -> 'a t -> 'b -> 'b
-end
-(** Minimal interface for maps, subtype of stdlib's Map. *)
-
-module Make :
-  functor (S:SetS) ->
-    functor (M:MapS with type key = S.elt) ->
-      PartitionSig with type elt = S.elt and type set = S.t