* vc/diff.el (diff-latest-backup-file): Autoload.

lisp/ChangeLog

+2012-09-20  Chong Yidong  <cyd@gnu.org>
+
+	* vc/diff.el (diff-latest-backup-file): Autoload.
+
 2012-09-20  Stefan Monnier  <monnier@iro.umontreal.ca>
 	* calc/calc.el: Remove redundant autoload shape check.

lisp/vc/diff.el

@@ -197,7 +197,8 @@ With prefix arg, prompt for diff switches."
 	    ori file))
     (diff bak ori switches)))
 
-(defun diff-latest-backup-file (fn)	; actually belongs into files.el
+;;;###autoload
+(defun diff-latest-backup-file (fn)
   "Return the latest existing backup of FILE, or nil."
   (let ((handler (find-file-name-handler fn 'diff-latest-backup-file)))
     (if handler