diff -r 9c9bbaa2fff1 -r 8d7778a19857 src/HOL/Library/Char_ord.thy
--- a/src/HOL/Library/Char_ord.thy	Fri Aug 24 20:58:29 2012 +0200
+++ b/src/HOL/Library/Char_ord.thy	Sun Aug 26 10:20:26 2012 +0200
@@ -5,7 +5,7 @@
 header {* Order on characters *}
 
 theory Char_ord
-imports Product_ord Char_nat Main
+imports Char_nat
 begin
 
 instantiation nibble :: linorder