src/HOL/Library/Executable_Set.thy

--- a/src/HOL/Library/Executable_Set.thy	Thu Jun 26 10:06:54 2008 +0200
+++ b/src/HOL/Library/Executable_Set.thy	Thu Jun 26 10:07:01 2008 +0200
@@ -6,7 +6,7 @@
 header {* Implementation of finite sets by lists *}
 
 theory Executable_Set
-imports List
+imports Plain List
 begin
 
 subsection {* Definitional rewrites *}