anchor.diff:                                       (stream rs.serialize::*serializer-output*) &rest args)
     (declare (ignore args))
     (rs.serialize:with-object ("error" :serializer serializer
  -                                      :stream stream)
  +                                     :stream stream)
       (rs.serialize:set-attribute
  -     "detail"
  +     "message"
        (apply #'format
               nil
               (simple-condition-format-control error)
  
positive.code:                                                         (stream rs.serialize::*serializer-output*) &rest args)
    (declare (ignore args))
    (rs.serialize:with-object ("error" :serializer serializer
                                        :stream stream)
      (rs.serialize:set-attribute
       "detail"
       (apply #'format
  
negative.code:             (funcall function)
            (error (e)
              (funcall error-handler e)))
          (funcall function))))
  
  ;; Plugging
  
  