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src/HOL/Library/Dlist.thy
changeset 39915 ecf97cf3d248
parent 39727 5dab9549c80d
child 40122 1d8ad2ff3e01 
--- a/src/HOL/Library/Dlist.thy	Sat Oct 02 12:32:31 2010 +0200
+++ b/src/HOL/Library/Dlist.thy	Mon Oct 04 12:22:58 2010 +0200
@@ -140,7 +140,7 @@
   case (Abs_dlist xs)
   then have "distinct xs" and dxs: "dxs = Dlist xs" by (simp_all add: Dlist_def distinct_remdups_id)
   from `distinct xs` have "P (Dlist xs)"
-  proof (induct xs rule: distinct_induct)
+  proof (induct xs)
     case Nil from empty show ?case by (simp add: empty_def)
   next
     case (insert x xs)
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