proposition: Lemma NonEmpty_String_wordToNat : forall n s w, String.length s = wordToNat w -> w <> wzero n -> s <> ""%string.
proof: Proof. unfold not; intros; apply H0; subst. generalize (f_equal (natToWord n) H); rewrite natToWord_wordToNat; simpl; eauto. 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