Move MonadIO to base

[Michael Snoyman]

On Sat, Apr 10, 2010 at 8:35 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.
>
>
> Twan
>
>
> [1] http://www.haskell.org/pipermail/libraries/2009-December/012914.html
> [2] http://hackage.haskell.org/trac/ghc/ticket/3777
>
> +1 from me as well, I just wrote some code that would *love* to have
MonadIO available but I couldn't tie down to mtl or transformers.

Michael
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