Printable.Optiontype t = Base.t optionval equal : t -> t -> Ppx_deriving_runtime.boolval compare : t -> t -> Ppx_deriving_runtime.intval hash : t -> intval pretty : unit -> t -> Pretty.docval show : Base.t option -> stringval printXml : 'a BatInnerIO.output -> Base.t option -> unitval to_yojson : Base.t option -> Yojson.Safe.t