diff -r 56617a7b68c5 -r 97e9dae57284 src/HOL/Nominal/Examples/Class.thy
--- a/src/HOL/Nominal/Examples/Class.thy	Tue Jun 10 16:43:07 2008 +0200
+++ b/src/HOL/Nominal/Examples/Class.thy	Tue Jun 10 16:43:14 2008 +0200
@@ -16599,7 +16599,7 @@
              \<Longrightarrow> P (x1,x2,x3)"  
  shows "P (x1,x2,x3)"
 apply(rule_tac my_wf_induct_triple[OF a])
-apply(case_tac x)
+apply(case_tac x rule: prod.exhaust)
 apply(simp)
 apply(case_tac b)
 apply(simp)