Add Applicative instance for STM

[Edward Kmett]

+1 from me for either solution.

On Sun, May 16, 2010 at 1:24 PM, Bas van Dijk <v.dijk.bas at gmail.com> wrote:

> On Sun, May 16, 2010 at 7:10 PM, Ian Lynagh <igloo at earth.li> wrote:
> > On Sun, May 16, 2010 at 06:36:56PM +0200, Bas van Dijk wrote:
> >> On Sun, May 16, 2010 at 4:19 PM, Ross Paterson <ross at soi.city.ac.uk>
> wrote:
> >> > It might be simpler to have Control/Applicative.hs import GHC.Conc and
> >> > define the instance.
> >>
> >> The {-# SOURCE #-} import of Control.Applicative and the accompanying
> >> boot file are indeed unfortunate. However, I like having the Functor,
> >> Applicative and Monad instances in one place. But I can easily be
> >> convinced if more people like it your way.
> >
> > I would prefer to avoid the import loop.
>
> I just created a new patch that adds the Applicative and Alternative
> instances for GHC.Conc.STM to Control.Applicative (guarded in a #ifdef
> __GLASGOW_HASKELL__ block).
>
> Bas
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