proposition: Lemma step_star_latest_label : forall s1 h s2, step_star s1 h s2 -> latest_label s1 <= latest_label s2.
proof: Proof. induction 1; simpl; eauto. destruct H0; substs; simpl in *; auto. Qed.
imports: Coq(FunctionalExtensionality Arith Lia) Coq(Arith.Peano_dec Arith.Compare_dec) Coq(Relations.Relation_Operators) Coq(List) Chapar(Predefs)