src/HOL/Main.thy

--- a/src/HOL/Main.thy	Tue Aug 13 15:59:22 2013 +0200
+++ b/src/HOL/Main.thy	Tue Aug 13 15:59:22 2013 +0200
@@ -1,7 +1,7 @@
 header {* Main HOL *}
 
 theory Main
-imports Predicate_Compile Nitpick Extraction
+imports Predicate_Compile Nitpick Extraction Lifting_Sum
 begin
 
 text {*