Variable purecopying fix (Bug#6083).

* international/mule.el (auto-coding-alist):  Only purecopy
car or each item, not the whole list (Bug#6083).

2 files changed, 7 insertions, 1 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index a7df32a3463..fce9334afcb 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,8 @@
+2010-05-03  Chong Yidong  <cyd@stupidchicken.com>
+
+        * international/mule.el (auto-coding-alist):  Only purecopy
+        car or each item, not the whole list (Bug#6083).
+
 2010-05-02  Chong Yidong  <cyd@stupidchicken.com>
 
         * progmodes/js.el (js-mode): Make paragraph variables local before
diff --git a/lisp/international/mule.el b/lisp/international/mule.el
index 8d2f6dede15..7e7e55728c8 100644
--- a/lisp/international/mule.el
+++ b/lisp/international/mule.el
@@ -1625,7 +1625,8 @@ and convert it in the temporary buffer.  Otherwise, convert in-place."
 (defcustom auto-coding-alist
   ;; .exe and .EXE are added to support archive-mode looking at DOS
   ;; self-extracting exe archives.
-  (purecopy '(("\\.\\(\
+  (mapcar (lambda (arg) (cons (purecopy (car arg)) (cdr arg)))
+          '(("\\.\\(\
 arc\\|zip\\|lzh\\|lha\\|zoo\\|[jew]ar\\|xpi\\|rar\\|\
 ARC\\|ZIP\\|LZH\\|LHA\\|ZOO\\|[JEW]AR\\|XPI\\|RAR\\)\\'"
      . no-conversion-multibyte)