[Haskell-cafe] Hackage: Tarball and package description of package mtl differ

[Adam Bergmark]

This is because a revision to the cabal file was published[1]. Tarballs
always stay the same (because of possible signing, etc) but cabal-install
will use the revised metadata when doing most of its operation including
`install', `get', and `unpack'.

You don't say how you are trying to install mtl, is it not through Cabal?
Either  way, make sure to use the revised cabal file and it should be fine.

HTH,
Adam

[1] https://hackage.haskell.org/package/mtl-2.2.1/revisions/

On Wed, Feb 10, 2016 at 3:09 PM, Björn Peemöller <bjp at informatik.uni-kiel.de
> wrote:

> Hi Cafe,
>
> I just wanted to install the mtl package for GHC 8.0.1-rc2, but
> installation failed with
>
>   Setup: Encountered missing dependencies:
>   transformers ==0.4.*
>
> Taking a look at the package description [1], it specifies
>
>   build-depends: base < 6, transformers >= 0.4 && < 0.6
>
> but the Cabal description in the tarball [2] says
>
>   build-depends: base < 6, transformers == 0.4.*
>
> Strangely, if I execute
>
>   $ cabal unpack mtl-2.2.1
>
> I obtain a version with the same specification as [1].
>
> Does anybody has an explanation for this?
>
> Regards,
> Björn
>
> [1]: http://hackage.haskell.org/package/mtl-2.2.1/mtl.cabal
> [2]: http://hackage.haskell.org/package/mtl-2.2.1/mtl-2.2.1.tar.gz
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