lisp/emacs-lisp/derived.el: Don't warn about keymaps already `defconst'ed.

lisp/ChangeLog

+2011-03-22  Juanma Barranquero  <lekktu@gmail.com>
+
+	* emacs-lisp/derived.el (define-derived-mode): Wrap declaration of
+	keymap variable in `with-no-warnings' to avoid a warning when the
+	keymap has been already `defconst'ed.
+
 2011-03-22  Leo Liu  <sdl.web@gmail.com>
 	* abbrev.el (write-abbrev-file): Use utf-8 for writing if it can

lisp/emacs-lisp/derived.el

@@ -201,7 +201,7 @@ No problems result if this variable is not bound.
 		       name))))
        (unless (boundp ',map)
 	 (put ',map 'definition-name ',child))
-       (defvar ,map (make-sparse-keymap))
+       (with-no-warnings (defvar ,map (make-sparse-keymap)))
        (unless (get ',map 'variable-documentation)
 	 (put ',map 'variable-documentation
 	      (purecopy ,(format "Keymap for `%s'." child))))