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src/HOL/ex/Unification.thy
changeset 58249 180f1b3508ed
parent 56790 f54097170704
child 58310 91ea607a34d8 
--- a/src/HOL/ex/Unification.thy	Tue Sep 09 17:51:07 2014 +0200
+++ b/src/HOL/ex/Unification.thy	Tue Sep 09 20:51:36 2014 +0200
@@ -32,7 +32,7 @@
 
 text {* Binary trees with leaves that are constants or variables. *}
 
-datatype 'a trm = 
+datatype_new 'a trm = 
   Var 'a 
   | Const 'a
   | Comb "'a trm" "'a trm" (infix "\<cdot>" 60)
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