[Haskell-beginners] Is there a way to hide an existing data type so that I can use my own version?

Hi Folks, For learning purposes, I created an "Either" data type: data Either a b = Left a | Right b deriving (Show) However, when I try to use Left (or Right), I get an error message saying that it is ambiguous whether I am using Prelude.Left or Main.Left So I tried hiding Prelude.Either like so: import Prelude hiding Either But that produced an error. Is there a way to hide the existing Either data type so that I can use my own version? /Roger