anchor.diff:  ;;   (webkit:webkit-web-view-go-to-back-forward-list-item
   ;;    (gobject-gtk-object buffer)
   ;;    (webkit-history-entry-gobject-gtk-object history-entry)))
  -
  -
  -(define-user-class window (gobject-gtk-window))
  -(define-user-class buffer (gobject-gtk-buffer))
  -(define-user-class browser (gobject-gtk-browser))
  
positive.code:   (:export-class-name-p t)
    (:export-accessor-names-p t)
    (:accessor-name-transformer #'class*:name-identity))
  
  (define-class data-manager-data-path (data-path)
    ((ref :initform "data-manager"))
  
negative.code:   (:export-class-name-p t)
    (:export-accessor-names-p t)
    (:accessor-name-transformer #'class*:name-identity))
  (define-user-class window (gobject-gtk-window))
  
  (define-class gobject-gtk-buffer ()
    ((gtk-object)
  