diff -r 61276a7fc369 -r dd04a8b654fc src/HOL/Tools/Function/partial_function.ML
--- a/src/HOL/Tools/Function/partial_function.ML	Tue Dec 31 11:19:14 2013 +0100
+++ b/src/HOL/Tools/Function/partial_function.ML	Tue Dec 31 14:29:16 2013 +0100
@@ -265,7 +265,7 @@
       |> HOLogic.mk_Trueprop
       |> Logic.all x_uc;
 
-    val mono_thm = Goal.prove_internal [] (cert mono_goal)
+    val mono_thm = Goal.prove_internal lthy [] (cert mono_goal)
         (K (mono_tac lthy 1))
     val inst_mono_thm = Thm.forall_elim (cert x_uc) mono_thm