Re: [Haskell-cafe] Either as a Monad instance

On Tue, Oct 03, 2006 at 07:52:54AM -0400, Lennart Augustsson wrote:

Yes, having fail in the Monad is a horrible wart. And like some other warts in Haskell it was added to cure the symptom rather than the disease. :(

Switching metaphors, what do you see as the disease in this case? (As far as I know, it's there for the translation of pattern match failure in do-expressions.)