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src/HOL/Library/Permutation.thy
changeset 63649 e690d6f2185b
parent 63310 caaacf37943f
child 64587 8355a6e2df79 
--- a/src/HOL/Library/Permutation.thy	Wed Aug 10 09:33:54 2016 +0200
+++ b/src/HOL/Library/Permutation.thy	Wed Aug 10 14:50:59 2016 +0200
@@ -95,7 +95,7 @@
   by auto
 
 proposition cons_perm_imp_perm: "z # xs <~~> z # ys \<Longrightarrow> xs <~~> ys"
-  by (drule_tac z = z in perm_remove_perm) auto
+  by (drule perm_remove_perm [where z = z]) auto
 
 proposition cons_perm_eq [iff]: "z#xs <~~> z#ys \<longleftrightarrow> xs <~~> ys"
   by (blast intro: cons_perm_imp_perm)
isabelle