proposition: Lemma string_copy_length n ch : String.length (string_copy n ch) = n.
proof: Proof. induction n; simpl; eauto. Qed.
imports: Fiat.Common.Coq__8_4__8_5__Compat Coq.ZArith.ZArith Coq.Arith.PeanoNat Coq.Strings.Ascii Coq.Strings.String Fiat.Common.List.Operations Fiat.Common.StringOperations