Function: undefined

undefined is an interactive and byte-compiled function defined in subr.el.gz.

Signature

(undefined)

Documentation

Beep to tell the user this binding is undefined.

View in manual

Probably introduced at or before Emacs version 19.17.

Key Bindings

Source Code

;; Defined in /usr/src/emacs/lisp/subr.el.gz
(defun undefined ()
  "Beep to tell the user this binding is undefined."
  (declare (completion ignore))
  (interactive)
  (ding)
  (if defining-kbd-macro
      (error "%s is undefined" (key-description (this-single-command-keys)))
    (message "%s is undefined" (key-description (this-single-command-keys))))
  (force-mode-line-update)
  ;; If this is a down-mouse event, don't reset prefix-arg;
  ;; pass it to the command run by the up event.
  (setq prefix-arg
        (when (memq 'down (event-modifiers last-command-event))
          current-prefix-arg)))