Proposal: instance MonadIO Q

Edward Kmett ekmett at
Thu Jul 23 19:55:55 UTC 2015

Alternately we could lift MonadIO into base.

This could be used eventually to lift more computations into MonadIO. Then
nobody incurs an extra dependency and we have a first step towards more
generic IO operations.


On Thu, Jul 23, 2015 at 3:20 PM, Niklas Hambüchen <mail at> wrote:

> I'd also like to mention that there's a camp of people who'd like to
> have a safe/pure version of TH that cannot do any IO - for changes like
> the proposed one we should check whether they'd make that more difficult.
> On 23/07/15 20:09, David Feuer wrote:
> > I'm very much in the "Damn the torpedoes; full speed ahead" camp most of
> > the time, but not here. Transformers is a tiny step up from base. Why
> > would you make it depend on template haskell rather than the other way
> > around?
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