proposition: Lemma chomp_label_length : forall n label subdomain, (String.length (label ++ (String "." subdomain)) <= S n)%nat -> ValidLabel label -> (String.length subdomain <= n)%nat.
proof: Proof. destruct label. - unfold ValidLabel; simpl; intros; omega. - intro subdomain; rewrite length_append; simpl. omega. Qed.
imports: Fiat.Common.Coq__8_4__8_5__Compat Bedrock.Word Coq.ZArith.ZArith Coq.Strings.Ascii Coq.Strings.String Coq.Logic.Eqdep_dec Fiat.Computation.Core Fiat.Computation.FixComp Fiat.Computation.Notations Fiat.Computation.Refinements.General Fiat.Common.DecideableEnsembles Fiat.Narcissus.Common.Specs Fiat.Narcissus.Formats.FixStringOpt Fiat.Narcissus.Formats.NatOpt Fiat.Narcissus.Formats.WordOpt Fiat.Narcissus.Formats.AsciiOpt