Class PartialApplication.CoInductive normalization_done : Prop := did_normalization.CoInductive normalization_done : Prop := did_normalization.Class Params {A : Type} (of : A) (arity : nat).#[global] Instance eq_pars : Params (@eq) 1 := {}.#[global] Instance iff_pars : Params (@iff) 0 := {}.#[global] Instance impl_pars : Params (@impl) 0 := {}.#[global] Instance flip_pars : Params (@flip) 4 := {}.Ltac partial_application_tactic :=
  let rec do_partial_apps H m cont := 
    match m with
      | ?m' ?x => class_apply @Reflexive_partial_app_morphism ; 
        [(do_partial_apps H m' ltac:(idtac))|clear H]
      | _ => cont
    end
  in
  let rec do_partial H ar m := 
    lazymatch ar with
      | 0%nat => do_partial_apps H m ltac:(fail 1)
      | S ?n' =>
        match m with
          ?m' ?x => do_partial H n' m'
        end
    end
  in
  let params m sk fk :=
    (let m' := fresh in head_of_constr m' m ;
     let n := fresh in evar (n:nat) ;
     let v := eval compute in n in clear n ;
      let H := fresh in
        assert(H:Params m' v) by (subst m'; once typeclasses eauto) ;
          let v' := eval compute in v in subst m';
            (sk H v' || fail 1))
    || fk
  in
  let on_morphism m cont :=
    params m ltac:(fun H n => do_partial H n m)
      ltac:(cont)
  in
  match goal with
    | [ _ : normalization_done |- _ ] => fail 1
    | [ _ : @Params _ _ _ |- _ ] => fail 1
    | [ |- @Proper ?T _ (?m ?x) ] =>
      match goal with
        | [ H : PartialApplication |- _ ] =>
          class_apply @Reflexive_partial_app_morphism; [|clear H]
        | _ => on_morphism (m x)
          ltac:(class_apply @Reflexive_partial_app_morphism)
      end
  end.Ltac proper_reflexive :=
  match goal with
    | [ _ : normalization_done |- _ ] => fail 1
    | _ => class_apply proper_eq || class_apply @reflexive_proper
  end.Class Normalizes (m : relation A) (m' : relation A) : Prop :=
    normalizes : relation_equivalence m m'.Ltac normalizes :=
  match goal with
    | [ |- Normalizes _ (respectful _ _) _ ] => class_apply @flip_arrow
    | _ => class_apply @flip_atom
  end.

Lemma flip_atom R : Normalizes R (flip (flip R)).