Use define-derived-mode (and derived-mode-p).

* lisp/play/snake.el (snake-mode):
* lisp/play/mpuz.el (mpuz-mode):
* lisp/play/landmark.el (lm-mode):
* lisp/play/blackbox.el (blackbox-mode):
* lisp/play/5x5.el (5x5-mode):
* lisp/obsolete/options.el (Edit-options-mode):
* lisp/net/quickurl.el (quickurl-list-mode):
* lisp/net/newst-treeview.el (newsticker-treeview-mode):
* lisp/mail/rmailsum.el (rmail-summary-mode):
* lisp/mail/mspools.el (mspools-mode):
* lisp/locate.el (locate-mode):
* lisp/ibuffer.el (ibuffer-mode):
* lisp/emulation/ws-mode.el (wordstar-mode):
* lisp/emacs-lisp/debug.el (debugger-mode):
* lisp/array.el (array-mode):
* lisp/net/eudc.el (eudc-mode): Use define-derived-mode.
* lisp/net/mairix.el (mairix-searches-mode-font-lock-keywords):
Move initialization into declaration.
(mairix-searches-mode): Use define-derived-mode.
* lisp/net/eudc-hotlist.el (eudc-hotlist-mode): Use define-derived-mode.
(eudc-edit-hotlist): Use dolist.
* lisp/man.el (Man-mode-syntax-table): Rename from man-mode-syntax-table.
(Man-mode): Use define-derived-mode.
* lisp/info.el (Info-edit-mode-map): Rename from Info-edit-map.
(Info-edit-mode): Use define-derived-mode.
(Info-cease-edit): Use Info-mode.
* lisp/eshell/esh-mode.el (eshell-mode-syntax-table): Move initialization
into declaration.
(eshell-mode): Use define-derived-mode.
* lisp/chistory.el (command-history-mode-map): Rename from
command-history-map.
(command-history-mode): Use define-derived-mode.
* lisp/calc/calc.el (calc-trail-mode-map): New var.
(calc-trail-mode): Use define-derived-mode.
(calc-trail-buffer): Set calc-main-buffer manually.
* lisp/bookmark.el (bookmark-insert-annotation): New function.
(bookmark-edit-annotation): Use it.
(bookmark-edit-annotation-mode): Make it a proper major mode.
(bookmark-send-edited-annotation): Use derived-mode-p.
* lisp/arc-mode.el (archive-mode): Move kill-all-local-variables a tiny bit
closer to its ideal place.  Use \' to match EOS.

* lisp/cedet/semantic/grammar.el (semantic-grammar-mode): Use define-derived-mode.
(semantic-grammar-mode-syntax-table): Rename from
semantic-grammar-syntax-table.
(semantic-grammar-mode-map): Rename from semantic-grammar-map.
* lisp/cedet/data-debug.el (data-debug-mode-map): Rename from data-debug-map.
(data-debug-mode): Use define-derived-mode.

* lisp/gnus/score-mode.el (gnus-score-mode-map): Move initialization
into declaration.
(gnus-score-mode): Use define-derived-mode.
* lisp/gnus/gnus-srvr.el (gnus-browse-mode): Use define-derived-mode.
* lisp/gnus/gnus-kill.el (gnus-kill-file-mode-map): Move initialization
into declaration.
(gnus-kill-file-mode): Use define-derived-mode.
(gnus-kill-file-edit-file, gnus-kill-file-enter-kill, gnus-kill):
Use derived-mode-p.
* lisp/gnus/gnus-group.el (gnus-group-mode): Use define-derived-mode.
(gnus-group-setup-buffer, gnus-group-name-at-point)
(gnus-group-make-web-group, gnus-group-enter-directory)
(gnus-group-suspend): Use derived-mode-p.
* lisp/gnus/gnus-cus.el (gnus-custom-mode): Use define-derived-mode.
* lisp/gnus/gnus-bookmark.el (gnus-bookmark-bmenu-mode): Use define-derived-mode.
* lisp/gnus/gnus-art.el (gnus-article-mode): Use define-derived-mode.
(gnus-article-setup-buffer, gnus-article-prepare)
(gnus-article-prepare-display, gnus-sticky-article)
(gnus-kill-sticky-article-buffer, gnus-kill-sticky-article-buffers)
(gnus-bind-safe-url-regexp, gnus-article-check-buffer)
(gnus-article-read-summary-keys): Use derived-mode-p.

lisp/emacs-lisp/debug.el

@@ -626,7 +626,7 @@ The environment used is the one when entering the activation frame at point."
 
 (put 'debugger-mode 'mode-class 'special)
 
-(defun debugger-mode ()
+(define-derived-mode debugger-mode fundamental-mode "Debugger"
   "Mode for backtrace buffers, selected in debugger.
 \\<debugger-mode-map>
 A line starts with `*' if exiting that frame will call the debugger.
@@ -641,13 +641,9 @@ which functions will enter the debugger when called.
 
 Complete list of commands:
 \\{debugger-mode-map}"
-  (kill-all-local-variables)
-  (setq major-mode 'debugger-mode)
-  (setq mode-name "Debugger")
   (setq truncate-lines t)
   (set-syntax-table emacs-lisp-mode-syntax-table)
-  (use-local-map debugger-mode-map)
-  (run-mode-hooks 'debugger-mode-hook))
+  (use-local-map debugger-mode-map))
 
 (defcustom debugger-record-buffer "*Debugger-record*"
   "Buffer name for expression values, for \\[debugger-record-expression]."