--- a/Nominal/nominal_dt_quot.ML	Sat May 12 20:54:00 2012 +0100
+++ b/Nominal/nominal_dt_quot.ML	Tue May 22 14:00:59 2012 +0200
@@ -58,7 +58,7 @@
 fun define_qtypes qtys_descr alpha_tys alpha_trms alpha_equivp_thms lthy =
   let
     val qty_args1 = map2 (fn ty => fn trm => (ty, trm, false)) alpha_tys alpha_trms
-    val qty_args2 = (map2 (fn descr => fn args1 => (descr, args1, NONE)) qtys_descr qty_args1)
+    val qty_args2 = (map2 (fn descr => fn args1 => (descr, args1, (NONE, false))) qtys_descr qty_args1)
     val qty_args3 = qty_args2 ~~ alpha_equivp_thms
   in
     fold_map Quotient_Type.add_quotient_type qty_args3 lthy