fact: Definition last_char_in__iff__for_last_char {str ls} : last_char_in str ls <-> for_last_char str (fun ch => List.In ch ls).
imports: Fiat.Common.Coq__8_4__8_5__Compat Coq.ZArith.ZArith Fiat.Parsers.StringLike.Core Fiat.Parsers.StringLike.Properties Fiat.Parsers.StringLike.ForallChars Fiat.Common