[Haskell-cafe] Bad interface problem.

[Magicloud Magiclouds]

But why it does not occur on other installation?

And Albert, I did not directly install QuickCheck. It was required by yesod.

On Wed, Jul 11, 2012 at 10:55 PM, Brandon Allbery <allbery.b at gmail.com> wrote:
> On Wed, Jul 11, 2012 at 5:28 AM, Magicloud Magiclouds
> <magicloud.magiclouds at gmail.com> wrote:
>>
>> Even I removed all user space packages, the error was still. I think
>> it is a ghc pkg problem, that every package register itself as
>> package:function while ghc (or cabal?) required
>> package-version:function.
>
>
> That's not the problem, it's the symptom.  Package symbols are always
> versioned; ghc only shows the version when it's the only way to disambiguate
> symbols.
>
> So when it shows you a conflict where one is versioned and the other isn't,
> you have multiple versions of a package installed.
>
>>
>> But --constraint='template-haskell-2.7.0.0' did make it compiled.
>
>
> And that's how you prevent it.
>
> --
> brandon s allbery                                      allbery.b at gmail.com
> wandering unix systems administrator (available)     (412) 475-9364 vm/sms
>



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