--- a/src/HOL/Library/Nested_Environment.thy Mon Dec 10 11:24:09 2007 +0100
+++ b/src/HOL/Library/Nested_Environment.thy Mon Dec 10 11:24:12 2007 +0100
@@ -6,7 +6,7 @@
header {* Nested environments *}
theory Nested_Environment
-imports Main
+imports List
begin
text {*