Module Data := D.Module Import MapS := IntMake(I)(X).Module LO := FMapList.Make_ord(X)(D).Module R := Raw.Module P := Raw.Proofs.Definition t := MapS.t D.t.Definition cmp e e' :=
   match D.compare e e' with EQ _ => true | _ => false end.(** One step of comparison of elements *)

  Definition compare_more x1 d1 (cont:R.enumeration D.t -> comparison) e2 :=
   match e2 with
    | R.End _ => Gt
    | R.More x2 d2 r2 e2 =>
       match X.compare x1 x2 with
        | EQ _ => match D.compare d1 d2 with
                   | EQ _ => cont (R.cons r2 e2)
                   | LT _ => Lt
                   | GT _ => Gt
                  end
        | LT _ => Lt
        | GT _ => Gt
       end
   end.(** Comparison of left tree, middle element, then right tree *)

  Fixpoint compare_cont s1 (cont:R.enumeration D.t -> comparison) e2 :=
   match s1 with
    | R.Leaf _ => cont e2
    | R.Node l1 x1 d1 r1 _ =>
       compare_cont l1 (compare_more x1 d1 (compare_cont r1 cont)) e2
   end.(** Initial continuation *)

  Definition compare_end (e2:R.enumeration D.t) :=
   match e2 with R.End _ => Eq | _ => Lt end.(** The complete comparison *)

  Definition compare_pure s1 s2 :=
   compare_cont s1 compare_end (R.cons s2 (Raw.End _)).(** Correctness of this comparison *)

  Definition Cmp c :=
   match c with
    | Eq => LO.eq_list
    | Lt => LO.lt_list
    | Gt => (fun l1 l2 => LO.lt_list l2 l1)
   end.

Lemma compare_Cmp : forall s1 s2, Cmp (compare_pure s1 s2) (R.elements s1) (R.elements s2).