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src/HOL/Imperative_HOL/Heap_Monad.thy
changeset 58249 180f1b3508ed
parent 57956 3ab5d15fac6b
child 58310 91ea607a34d8 
--- a/src/HOL/Imperative_HOL/Heap_Monad.thy	Tue Sep 09 17:51:07 2014 +0200
+++ b/src/HOL/Imperative_HOL/Heap_Monad.thy	Tue Sep 09 20:51:36 2014 +0200
@@ -16,7 +16,7 @@
 
 text {* Monadic heap actions either produce values
   and transform the heap, or fail *}
-datatype 'a Heap = Heap "heap \<Rightarrow> ('a \<times> heap) option"
+datatype_new 'a Heap = Heap "heap \<Rightarrow> ('a \<times> heap) option"
 
 lemma [code, code del]:
   "(Code_Evaluation.term_of :: 'a::typerep Heap \<Rightarrow> Code_Evaluation.term) = Code_Evaluation.term_of"
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