don't generate code in Word because it breaks the current code setup

--- a/src/HOL/Word/Word.thy	Thu May 17 13:36:23 2012 +0200
+++ b/src/HOL/Word/Word.thy	Fri May 18 15:08:08 2012 +0200
@@ -245,7 +245,7 @@
   "reflp (\<lambda>x y. bintrunc (len_of TYPE('a::len0)) x = bintrunc (len_of TYPE('a)) y)"
   by (simp add: reflp_def)
 
-setup_lifting Quotient_word reflp_word
+setup_lifting(no_code) Quotient_word reflp_word
 
 text {* TODO: The next lemma could be generated automatically. *}