Fixpoint set_params' (vl: list val) (il: list ident) (te: Cminor.env) : Cminor.env :=
  match il, vl with
  | i1 :: is, v1 :: vs => set_params' vs is (PTree.set i1 v1 te)
  | i1 :: is, nil => set_params' nil is (PTree.set i1 Vundef te)
  | _, _ => te
  end.

Lemma bind_parameters_agree_rec: forall f vars vals tvals le1 le2 te, bind_parameters vars vals le1 = Some le2 -> val_list_inject f vals tvals -> match_temps f le1 te -> match_temps f le2 (set_params' tvals vars te).