diff -r 2f5a4367a39e -r 0f65fa163304 src/HOL/IMP/VC.thy
--- a/src/HOL/IMP/VC.thy	Wed Mar 19 22:47:39 2008 +0100
+++ b/src/HOL/IMP/VC.thy	Wed Mar 19 22:50:42 2008 +0100
@@ -77,7 +77,7 @@
   apply fast
  (* if *)
  apply atomize
- apply (tactic "Deepen_tac 4 1")
+ apply (tactic "deepen_tac @{claset} 4 1")
 (* while *)
 apply atomize
 apply (intro allI impI)