Move MonadIO to base

[Edward Kmett]

+1 from me.

Also, there is some (very recent) work in transformers for splitting apart
Control.Monad.Trans into a module for IO and one for MonadTrans, so the
scaffolding to support this is already in place.

http://osdir.com/ml/libraries@haskell.org/2010-03/msg00233.html

-Edward Kmett

On Sat, Apr 10, 2010 at 1:35 PM, Antoine Latter <aslatter at gmail.com> wrote:

> On Sat, Apr 10, 2010 at 10:35 AM, Twan van Laarhoven <twanvl at gmail.com>
> wrote:
> > Hello,
> >
> >
> >
> > Some people have remarked that the MonadIO class would be better of in
> the
> > base package instead of mtl/transformers. It can be used largely
> > independently from the monad transformers, and it is useful without them.
> >
> > This has been previously discussed [1,2], but as far as I know nothing
> ever
> > came of it.
> >
> > 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.
> >
> > How hard would it be to make this change? For backwards compatibility mtl
> > and transformers would need a check to see which version of base is used,
> or
> > new versions of mtl/transformers should just not include MonadIO.
> >
> >
>
> +1 from me.
>
> Sorry for dropping the last thread, but that was the conclusion it
> seemed to come to.
> I'm not as sure about moving MonadTrans to Base, but that's because I
> never use it.
>
> Antoine
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