diff -r 2da02764d523 -r 52551c0a3374 src/HOL/ex/Quickcheck_Narrowing_Examples.thy
--- a/src/HOL/ex/Quickcheck_Narrowing_Examples.thy	Fri Mar 18 18:19:42 2011 +0100
+++ b/src/HOL/ex/Quickcheck_Narrowing_Examples.thy	Fri Mar 18 18:19:42 2011 +0100
@@ -10,12 +10,12 @@
 begin
 
 subsection {* Minimalistic examples *}
-
+(*
 lemma
   "x = y"
-quickcheck[tester = narrowing, finite_types = false, default_type = nat, expect = counterexample]
+quickcheck[tester = narrowing, finite_types = false, default_type = int, expect = counterexample]
 oops
-
+*)
 (*
 lemma
   "x = y"
@@ -30,6 +30,10 @@
 oops
 
 lemma "rev xs = xs"
+  quickcheck[tester = narrowing, finite_types = false, default_type = int]
+oops
+
+lemma "rev xs = xs"
   quickcheck[tester = narrowing, finite_types = true]
 oops