[Haskell-cafe] Bad interface problem.

[Brandon Allbery]

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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.haskell.org/pipermail/haskell-cafe/attachments/20120711/24dbcde4/attachment.htm>