proposition: Lemma take_empty {str n} (H' : length str = 0) : take n str =s str.
proof: Proof. apply bool_eq_empty; rewrite ?drop_length, ?take_length; trivial. apply Nat.min_case_strong; omega. Qed.
imports: Fiat.Common.Coq__8_4__8_5__Compat Coq.ZArith.ZArith Fiat.Common Fiat.Common.List.Operations Fiat.Common.List.ListFacts Fiat.Common.Le Fiat.Common.Tactics.SetoidSubst Fiat.Common.Tactics.IsClosed Fiat.Parsers.StringLike.Core Fiat.Common.UIP