Move MonadIO to base

[Felipe Lessa]

On Sat, Apr 10, 2010 at 05:35:53PM +0200, Twan van Laarhoven wrote:
> Some people have remarked that the MonadIO class would be better of
> in the base package instead of mtl/transformers.

+1.

> If MonadIO were in base, then the base library itself could also use
> it. For example the functions in System.IO could be lifted to work
> on any MonadIO monad. Whether that is a good idea is completely
> orthogonal to this discussion, however.

+1 as well.

Thanks,

--
Felipe.