diff -r dc6be28d7f4e -r c69542757a4d src/HOL/Library/List_Prefix.thy
--- a/src/HOL/Library/List_Prefix.thy	Mon Aug 16 14:21:54 2004 +0200
+++ b/src/HOL/Library/List_Prefix.thy	Mon Aug 16 14:22:27 2004 +0200
@@ -5,7 +5,9 @@
 
 header {* List prefixes and postfixes *}
 
-theory List_Prefix = Main:
+theory List_Prefix
+import Main
+begin
 
 subsection {* Prefix order on lists *}