--- a/src/HOL/ex/BT.thy Thu Sep 11 19:26:59 2014 +0200 +++ b/src/HOL/ex/BT.thy Thu Sep 11 19:32:36 2014 +0200 @@ -9,7 +9,7 @@ theory BT imports Main begin -datatype_new 'a bt = +datatype 'a bt = Lf | Br 'a "'a bt" "'a bt"