diff -r 4898bae6ef23 -r 0a54cfc9add3 src/HOL/ex/While_Combinator_Example.thy
--- a/src/HOL/ex/While_Combinator_Example.thy	Sat Nov 27 17:44:36 2010 -0800
+++ b/src/HOL/ex/While_Combinator_Example.thy	Sun Nov 28 15:20:51 2010 +0100
@@ -28,7 +28,7 @@
  apply (fastsimp intro!: lfp_lowerbound)
  apply (blast intro: wf_finite_psubset Int_lower2 [THEN [2] wf_subset])
 apply (clarsimp simp add: finite_psubset_def order_less_le)
-apply (blast intro!: finite_Diff dest: monoD)
+apply (blast dest: monoD)
 done