diff -r 6cfb5d8a5b5b -r add799cf0817 Nominal/Ex/Lambda.thy
--- a/Nominal/Ex/Lambda.thy	Wed Nov 10 13:40:46 2010 +0000
+++ b/Nominal/Ex/Lambda.thy	Wed Nov 10 13:46:21 2010 +0000
@@ -462,7 +462,7 @@
 
 lemma [quot_respect]: "(alpha_lam_raw ===> op =) match_Var_raw match_Var_raw"
   apply rule
-  apply (induct_tac a b rule: alpha_lam_raw.induct)
+  apply (induct_tac x y rule: alpha_lam_raw.induct)
   apply simp_all
   done