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Message from discussion Building with the latest version of haskeline
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Jason Dagit  
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 More options Oct 28 2012, 7:42 pm
From: Jason Dagit <dag...@gmail.com>
Date: Sun, 28 Oct 2012 16:42:08 -0700
Local: Sun, Oct 28 2012 7:42 pm
Subject: Re: [Idris] Building with the latest version of haskeline
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Sent!

The only things that I think we can break with this are:
  * If you really depend on lazy StateT then possibly switching to strict
is bad.
  * Might not work on older haskelines. I didn't check that they have
proper instances for strict StateT.

But really, this should be harmless and lazy StateT is usually not what
people want due to building up thunks.

Jason

On Sun, Oct 28, 2012 at 3:39 AM, Edwin Brady <edwin.br...@gmail.com> wrote:
> Hi Jason,
> That's great! If you can send me a pull request I'll check it works on
> Mac/Linux and apply it if so. Would be nice to have everything up to date.

> Thanks.
> Edwin.

> On 28 Oct 2012, at 01:40, Jason Dagit <dag...@gmail.com> wrote:

> > I started looking at what it would take to build Idris with the latest
> release of Haskeline.

> > It looks like the latest version very explicitly prefers the strict
> version of StateT, as you can see from the import list:
> http://hackage.haskell.org/packages/archive/haskeline/latest/doc/html...

> > import Control.Monad.Trans.State.Strict
> > instance MonadException m => MonadException (StateT s m) where
> >     controlIO f = StateT $ \s -> controlIO $ \(RunIO run) -> let
> >                     run' = RunIO (fmap (StateT . const) . run . flip
> runStateT s)
> >                     in fmap (flip runStateT s)
> >  $ f run'

> > Idris on the other hand, uses StateT from Control.Monad.State:
> http://hackage.haskell.org/packages/archive/mtl/latest/doc/html/src/C...
> > module Control.Monad.State (
> >   module Control.Monad.State.Lazy
> >   ) where

> > Which, as you can see, is a re-export of the lazy StateT transformer. I
> changed just the imports in Idris to use strict StateT and I was able to
> build against the latest Haskeline. I'm on windows so I ran into other
> build problems (I need gmp installed), but the basic idris interpreter can
> be built and the standard libs can be built as well. I can send a pull
> request on github if you're interested. I haven't tested my changes against
> older haskelines.

> > Jason


 
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