proposition: Lemma forall_chars__char_in_nil (str : String) : forall_chars__char_in str nil <-> length str = 0.
proof: Proof. unfold forall_chars__char_in. split. { eapply forall_chars_False; simpl; eauto. } { apply forall_chars_nil. } Qed.
imports: Fiat.Common.Coq__8_4__8_5__Compat Coq.ZArith.ZArith Fiat.Parsers.StringLike.Core Fiat.Parsers.StringLike.Properties Fiat.Common