diff -r cffdb7b28498 -r ff71cadefb14 src/HOL/Import/shuffler.ML
--- a/src/HOL/Import/shuffler.ML	Wed Oct 21 10:15:31 2009 +0200
+++ b/src/HOL/Import/shuffler.ML	Wed Oct 21 12:08:52 2009 +0200
@@ -78,7 +78,7 @@
   val empty = []
   val copy = I
   val extend = I
-  fun merge _ = Library.union Thm.eq_thm
+  fun merge _ = Library.merge Thm.eq_thm_prop
 )
 
 fun print_shuffles thy =