darcs patch: Adding isLeft, isRight, fromLeft, fromRight, splitEithers

[Neil Mitchell]

Hi

> > nevertheless, we want to use them all :)   "don't teach me a life,
> > just give some money :)"
>
> Sure.  Meanwhile over at http://hackage.haskell.org/trac/ghc/ticket/960
> we have yet another discussion of how to track down the runtime errors
> that result from this style.

The answer is Catch [1], which will soon handle all these sorts of
problems and more :)

Thanks

Neil

[1] http://www-users.cs.york.ac.uk/~ndm/projects/catch.php