UtilsLib.Errorval dummy_pos : posexception AcgtkError of string * Stdlib.Format.formatter -> unit * pos optionmodule type ERROR_MANAGER = sig ... endmodule type ERROR_HANDLER = sig ... endmodule ErrorManager (E : ERROR_MANAGER) : ERROR_HANDLER with type manager = E.tval underline_error : string -> pos -> unitval compute_comment_for_location : pos -> string