src/HOL/Library/Extended_Real.thy

--- a/src/HOL/Library/Extended_Real.thy	Tue Sep 09 17:51:07 2014 +0200
+++ b/src/HOL/Library/Extended_Real.thy	Tue Sep 09 20:51:36 2014 +0200
@@ -20,7 +20,7 @@
 
 subsection {* Definition and basic properties *}
 
-datatype ereal = ereal real | PInfty | MInfty
+datatype_new ereal = ereal real | PInfty | MInfty
 
 instantiation ereal :: uminus
 begin