diff -r a09ec6daaa19 -r 91ea607a34d8 src/HOL/ex/Unification.thy
--- a/src/HOL/ex/Unification.thy	Thu Sep 11 19:26:59 2014 +0200
+++ b/src/HOL/ex/Unification.thy	Thu Sep 11 19:32:36 2014 +0200
@@ -32,7 +32,7 @@
 
 text {* Binary trees with leaves that are constants or variables. *}
 
-datatype_new 'a trm = 
+datatype 'a trm = 
   Var 'a 
   | Const 'a
   | Comb "'a trm" "'a trm" (infix "\<cdot>" 60)