Printable.Optiontype t = Base.t optionval equal : t -> t -> Ppx_deriving_runtime.boolval compare : t -> t -> Ppx_deriving_runtime.intinclude module type of struct include Std endtype group = Std.group = |val show_group : group -> 'aval invariant : 'a -> 'b -> Invariant.tval hash : Base.t option -> intval pretty : unit -> t -> Pretty.docval show : Base.t option -> stringval printXml : 'a BatInnerIO.output -> Base.t option -> unit