--- a/src/HOL/Auth/Guard/Extensions.thy Thu Sep 11 18:54:36 2014 +0200
+++ b/src/HOL/Auth/Guard/Extensions.thy Thu Sep 11 18:54:36 2014 +0200
@@ -579,6 +579,7 @@
apply (drule_tac P="%G. X:parts G" in knows_Cons_substD, safe)
apply (erule initState_used)
apply (case_tac a, auto)
+apply (rename_tac msg)
apply (drule_tac B=A and X=msg and evs=evs in Gets_correct_Says)
by (auto dest: Says_imp_used intro: used_ConsI)
@@ -592,6 +593,7 @@
apply (frule_tac ev=a and evs=evs in one_step_Cons, simp, clarify)
apply (drule_tac P="%G. X:parts G" in knows_max_Cons_substD, safe)
apply (case_tac a, auto)
+apply (rename_tac msg)
apply (drule_tac B=A and X=msg and evs=evs in Gets_correct_Says)
by (auto simp: knows_max'_Cons dest: Says_imp_used intro: used_ConsI)