From: Katsumi Yamaoka <yamaoka@jpl.org>
Date: Fri, 3 Dec 2010 04:39:36 +0000 (+0000)
Subject: gnus-util.el (gnus-macroexpand-all): Don't modify argument.
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gnus-util.el (gnus-macroexpand-all): Don't modify argument.
---

diff --git a/lisp/gnus/ChangeLog b/lisp/gnus/ChangeLog
index d35265b6e3a..26279b00cdf 100644
--- a/lisp/gnus/ChangeLog
+++ b/lisp/gnus/ChangeLog
@@ -1,3 +1,7 @@
+2010-12-03  Katsumi Yamaoka  <yamaoka@jpl.org>
+
+	* gnus-util.el (gnus-macroexpand-all): Don't modify argument.
+
 2010-12-03  Glenn Morris  <rgm@gnu.org>
 
 	* mm-extern.el (message-goto-body): Update declaration.
diff --git a/lisp/gnus/gnus-util.el b/lisp/gnus/gnus-util.el
index af5159ece3b..1f391f0cc0c 100644
--- a/lisp/gnus/gnus-util.el
+++ b/lisp/gnus/gnus-util.el
@@ -2041,7 +2041,7 @@ Same as `string-match' except this function does not change the match data."
 If no macros are expanded, FORM is returned unchanged."
     (if (consp form)
 	(let ((idx 1)
-	      (len (length form))
+	      (len (length (setq form (copy-sequence form))))
 	      expanded)
 	  (while (< idx len)
 	    (setcar (nthcdr idx form) (gnus-macroexpand-all (nth idx form)))