sig
type error = Multiple_attributes of string | No_payload_expected of string
val get_no_payload_attribute :
string list -> Parsetree.attributes -> string Asttypes.loc option
val has_no_payload_attribute : string list -> Parsetree.attributes -> bool
exception Error of Location.t * Attr_helper.error
val report_error : Format.formatter -> Attr_helper.error -> unit
end