src/HOL/Library/IArray.thy

--- a/src/HOL/Library/IArray.thy	Tue Sep 09 17:51:07 2014 +0200
+++ b/src/HOL/Library/IArray.thy	Tue Sep 09 20:51:36 2014 +0200
@@ -13,7 +13,7 @@
 lists first. Arrays could be converted back into lists for printing if they
 were wrapped up in an additional constructor. *}
 
-datatype 'a iarray = IArray "'a list"
+datatype_new 'a iarray = IArray "'a list"
 
 primrec list_of :: "'a iarray \<Rightarrow> 'a list" where
 "list_of (IArray xs) = xs"