Re: [Haskell-beginners] "Trinary" version of Either

Hi, On 9 June 2011 16:15, Christopher Howard wrote:

a "trinary" version of Either, i.e., allowing three values instead of two

I'd probably nest Eithers: Either a (Either b c) You can also do some nicer trickery using the TypeOperators extension: {-# LANGUAGE TypeOperators #-} type Or = Either infixr 5 `Or` k :: a `Or` b `Or` c -- Same as "Either a (Either b c)" k = undefined HTH, Ozgur