proposition: Lemma equal_1 : Equivb cmp m m' -> equal cmp m m' = true.
proof: Proof. unfold Equivb. rewrite Equiv_iff; t. Qed.
imports: Coq.PArith.BinPos Coq.PArith.Pnat Coq.Arith.Arith Coq.FSets.FMapInterface Coq.FSets.FMapPositive Fiat.Parsers.ContextFreeGrammar.Carriers Fiat.Common.List.ListFacts Fiat.Common.List.ListMorphisms Fiat.Common.Prod