proposition: Lemma string_of_cont_cont : forall t, string_of_cont (cont t) = string_of_term t.
proof: Proof. apply term_ind_forall. refl. intros f t IH. simpl. rewrite !(Vcast_cons (is_unary_sig f)). simpl. rewrite IH. refl. Qed.
imports: CoLoR(LogicUtil RelUtil SN VecUtil ListUtil NatUtil)