diff -r a09ec6daaa19 -r 91ea607a34d8 src/HOL/MicroJava/JVM/JVMDefensive.thy
--- a/src/HOL/MicroJava/JVM/JVMDefensive.thy	Thu Sep 11 19:26:59 2014 +0200
+++ b/src/HOL/MicroJava/JVM/JVMDefensive.thy	Thu Sep 11 19:32:36 2014 +0200
@@ -11,7 +11,7 @@
 text {*
   Extend the state space by one element indicating a type error (or
   other abnormal termination) *}
-datatype_new 'a type_error = TypeError | Normal 'a
+datatype 'a type_error = TypeError | Normal 'a
 
 
 abbreviation