[Haskell-cafe] different behaviours with or without putStrLn

[Corentin Dupont]

One question:
Since it works with putStrLn, can I simulate the behaviour of putStrLn
without actually... printing anything? As a workaround...


On Mon, Jan 13, 2014 at 12:40 AM, Corentin Dupont <corentin.dupont at gmail.com
> wrote:

> I doesn't seems to be easy, either with deepseq-th or deepseq-generic...
> With deepseq-generic, the derivation of Generic doesn't work because I'm
> using a GATD.
> It says *"NewVar must be a vanilla data constructor"*.
>
> For deepseq-th, I have this error:
>
> *deriveNFData: 'forall' not supported in constructor declaration*
> I have some complex data constructor...
>
>
> So it looks like both deepseq-th and deepseq-generic are out of the game
> :((
>
>
>
>
> On Mon, Jan 13, 2014 at 12:08 AM, Erik de Castro Lopo <
> mle+hs at mega-nerd.com> wrote:
>
>> James ‘Twey’ Kay wrote:
>>
>> > You can (probably) automatically derive it via Template Haskell using
>> > the deepseq-th package:
>> >
>> >      {-# LANGUAGE TemplateHaskell #-}
>> >      import Control.DeepSeq.TH
>> >
>> >      data MyState = ...
>> >
>> >      $(deriveNFData ''MyState)
>>
>> In most cases where you think
>>
>> You should probably try the deepseq-generics package before you try
>> deepseq-th.
>>
>> The generics version was suggested to me by the author of the TH version,
>> Herbert Valerio Riedel. It seems to be just as fast as the TH version and
>> doesn't require TH.
>>
>> Cheers,
>> Erik
>> --
>> ----------------------------------------------------------------------
>> Erik de Castro Lopo
>> http://www.mega-nerd.com/
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>>
>
>
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