On Fri, Apr 13, 2012 at 11:46 AM, Kak Dod <kak.dod2008 at yahoo.com> wrote: > Thank you but > if I change the code like this: > > data BinTree a = Node BinTree a BinTree a | EmptyBinTree deriving Show > If you look closely, Kyle made other changes to your code as well :-) Antoine