diff -r 324a5d1289a3 -r e3f8673085b1 Nominal/Nominal2_Eqvt.thy
--- a/Nominal/Nominal2_Eqvt.thy	Mon Jan 17 15:12:03 2011 +0100
+++ b/Nominal/Nominal2_Eqvt.thy	Mon Jan 17 17:20:21 2011 +0100
@@ -33,7 +33,7 @@
   swap_eqvt flip_eqvt
 
   (* datatypes *)
-  Pair_eqvt permute_list.simps 
+  Pair_eqvt permute_list.simps permute_option.simps
 
   (* sets *)
   mem_eqvt empty_eqvt insert_eqvt set_eqvt