diff -r a75d71c73362 -r 9f90ac19e32b src/HOL/Library/Code_Message.thy
--- a/src/HOL/Library/Code_Message.thy	Thu Jun 26 10:06:54 2008 +0200
+++ b/src/HOL/Library/Code_Message.thy	Thu Jun 26 10:07:01 2008 +0200
@@ -5,7 +5,7 @@
 header {* Monolithic strings (message strings) for code generation *}
 
 theory Code_Message
-imports List
+imports Plain List
 begin
 
 subsection {* Datatype of messages *}