X-Git-Url: https://code.delx.au/gnu-emacs/blobdiff_plain/ba3189039adc8ec5eba5ed3e21d42019a4616b7c..d5a10aefee22cf1d092edad26c845e049ab8861c:/lisp/widget.el

diff --git a/lisp/widget.el b/lisp/widget.el
index f82b275385..2db645ab08 100644
--- a/lisp/widget.el
+++ b/lisp/widget.el
@@ -1,6 +1,6 @@
 ;;; widget.el --- a library of user interface components
 ;;
-;; Copyright (C) 1996-1997, 2001-2014 Free Software Foundation, Inc.
+;; Copyright (C) 1996-1997, 2001-2016 Free Software Foundation, Inc.
 ;;
 ;; Author: Per Abrahamsen <abraham@dina.kvl.dk>
 ;; Keywords: help, extensions, faces, hypermedia
@@ -80,9 +80,12 @@ create identical widgets:
 
 * (widget-create NAME)
 
-* (apply 'widget-create CLASS ARGS)
+* (apply \\='widget-create CLASS ARGS)
 
 The third argument DOC is a documentation string for the widget."
+  ;;
+  (unless (or (null doc) (stringp doc))
+    (error "widget documentation must be nil or a string."))
   (put name 'widget-type (cons class args))
   (put name 'widget-documentation (purecopy doc))
   name)