Ah, excellent. Thanks Henk-Jan. This works perfectly: -------------------------------------------------------- import Prelude hiding (Either, Left, Right) data Either a b = Left a | Right b deriving (Show) -------------------------------------------------------- /Roger -----Original Message----- From: Henk-Jan van Tuyl [mailto:hjgtuyl@chello.nl] Sent: Tuesday, July 31, 2012 7:19 AM To: beginners@haskell.org; Costello, Roger L. Subject: Re: [Haskell-beginners] Is there a way to hide an existing data type so that I can use my own version? On Tue, 31 Jul 2012 13:08:38 +0200, Costello, Roger L. <costello@mitre.org> wrote:
import Prelude hiding Either
That should be: import Prelude hiding (Either) Regards, Henk-Jan van Tuyl -- http://Van.Tuyl.eu/ http://members.chello.nl/hjgtuyl/tourdemonad.html Haskell programming --