Metapp_preutils.Sigtype t = Ppxlib.signatureval to_loc : Ppxlib.signature -> Location.tval iter : Ppxlib.Ast_traverse.iter -> t iterval map : Ppxlib.Ast_traverse.map -> t mapval of_payload : Ppxlib.payload -> Ppxlib.signatureval to_payload : Ppxlib.signature -> Ppxlib.payload