Merge from trunk.

[gnu-emacs] / lisp / emacs-lisp / ewoc.el

diff --git a/lisp/emacs-lisp/ewoc.el b/lisp/emacs-lisp/ewoc.el
index bf9998695eea4b581ff002dace191f6467566f6f..4fd87209b389b2291b4b0a69f291f193c4f4d056 100644 (file)
--- a/lisp/emacs-lisp/ewoc.el
+++ b/lisp/emacs-lisp/ewoc.el
@@ -1,6 +1,6 @@
 ;;; ewoc.el --- utility to maintain a view of a list of objects in a buffer
 
-;; Copyright (C) 1991-2011 Free Software Foundation, Inc.
+;; Copyright (C) 1991-2012 Free Software Foundation, Inc.
 
 ;; Author: Per Cederqvist <ceder@lysator.liu.se>
 ;;     Inge Wallin <inge@lysator.liu.se>
@@ -26,7 +26,7 @@
 ;;; Commentary:
 
 ;; Ewoc Was Once Cookie
-;; But now it's Emacs' Widget for Object Collections
+;; But now it's Emacs's Widget for Object Collections
 
 ;; As the name implies this derives from the `cookie' package (part
 ;; of Elib).  The changes are pervasive though mostly superficial:
@@ -495,6 +495,8 @@ Return the node (or nil if we just passed the last node)."
     ;; Never step below the first element.
     ;; (unless (ewoc--filter-hf-nodes ewoc node)
     ;;   (setq node (ewoc--node-nth dll -2)))
+    (unless node
+      (error "No next"))
     (ewoc-goto-node ewoc node)))
 
 (defun ewoc-goto-node (ewoc node)