(define-derived-mode): Preserve `mode-class' rather than `special' property.

(derived-mode-class): Make it obsolete.

1 files changed, 6 insertions, 4 deletions

diff --git a/lisp/derived.el b/lisp/derived.el
index 3586affe216..994509855e4 100644
--- a/lisp/derived.el
+++ b/lisp/derived.el
@@ -178,8 +178,9 @@ been generated automatically, with a reference to the keymap."
                                         ; Identify special modes.
           ,(when parent
              `(progn
-                (if (get (quote ,parent) 'special)
-                    (put (quote ,child) 'special t))
+                (if (get (quote ,parent) 'mode-class)
+                    (put (quote ,child) 'mode-class
+                         (get (quote ,parent) 'mode-class)))
                                         ; Set up maps and tables.
                 (unless (keymap-parent ,map)
                   (set-keymap-parent ,map (current-local-map)))
@@ -209,11 +210,12 @@ been generated automatically, with a reference to the keymap."
   "Find the class of a major MODE.
 A mode's class is the first ancestor which is NOT a derived mode.
 Use the `derived-mode-parent' property of the symbol to trace backwards.
-Since major-modes might derive from each other and from `fundamental-mode',
-this function is not very useful.  Use `derived-mode-p' instead."
+Since major-modes might all derive from `fundamental-mode', this function
+is not very useful."
   (while (get mode 'derived-mode-parent)
     (setq mode (get mode 'derived-mode-parent)))
   mode)
+(make-obsolete 'derived-mode-class 'derived-mode-p "21.4")
 
 
 ;;; PRIVATE