diff -r 51fda1c8fa2d -r 204f749f35a9 src/Tools/quickcheck.ML
--- a/src/Tools/quickcheck.ML	Fri Oct 02 21:42:31 2009 +0200
+++ b/src/Tools/quickcheck.ML	Fri Oct 02 22:02:11 2009 +0200
@@ -143,7 +143,7 @@
     val thy = Proof.theory_of state;
     fun strip (Const ("all", _) $ Abs (_, _, t)) = strip t
       | strip t = t;
-    val (_, (_, st)) = Proof.get_goal state;
+    val (_, st) = Proof.flat_goal state;
     val (gi, frees) = Logic.goal_params (prop_of st) i;
     val gi' = Logic.list_implies (assms, subst_bounds (frees, strip gi))
       |> monomorphic_term thy insts default_T