code: public static void report(UnmarshallingContext context, String version) {
          RobustReflectionConverter.addErrorInContext(context, new ReportException(version));
      }
docs: Inform monitor that some data in a deprecated format has been loaded, during
  XStream unmarshalling when the Saveable containing this object is not available.
  @param context XStream unmarshalling context
  @param version Hudson release when the data structure changed.