#4159: move Monad and MonadFix instances for Either from mtl to base

[Bas van Dijk]

On Tue, Jun 29, 2010 at 11:26 AM, Ross Paterson <ross at soi.city.ac.uk> wrote:
> The proposal is to move the Monad and MonadFix instances for Either
> (currently in the mtl package) to Control.Monad.Instances and
> Control.Monad.Fix respectively

+1

(I assume the 'fail' method will keep its default definition of 'error'.)

Regards,

Bas