src/HOL/Unix/Nested_Environment.thy

--- a/src/HOL/Unix/Nested_Environment.thy	Thu Sep 11 19:26:59 2014 +0200
+++ b/src/HOL/Unix/Nested_Environment.thy	Thu Sep 11 19:32:36 2014 +0200
@@ -19,7 +19,7 @@
   position within the structure.
 *}
 
-datatype_new (dead 'a, dead 'b, dead 'c) env =
+datatype (dead 'a, dead 'b, dead 'c) env =
     Val 'a
   | Env 'b  "'c \<Rightarrow> ('a, 'b, 'c) env option"