--- a/src/HOL/Nominal/Examples/Type_Preservation.thy Mon Jun 07 13:20:05 2010 +0200
+++ b/src/HOL/Nominal/Examples/Type_Preservation.thy Mon Jun 07 16:00:35 2010 +0200
@@ -142,7 +142,7 @@
shows "(\<Delta>@\<Gamma>) \<turnstile> e[x::=e'] : T"
using a b
proof (nominal_induct \<Gamma>'\<equiv>"\<Delta>@[(x,T')]@\<Gamma>" e T avoiding: x e' \<Delta> rule: typing.strong_induct)
- case (t_Var \<Gamma>' y T x e' \<Delta>)
+ case (t_Var y T x e' \<Delta>)
then have a1: "valid (\<Delta>@[(x,T')]@\<Gamma>)"
and a2: "(y,T) \<in> set (\<Delta>@[(x,T')]@\<Gamma>)"
and a3: "\<Gamma> \<turnstile> e' : T'" by simp_all