[Haskell-cafe] Hackage: Tarball and package description of package mtl differ
Björn Peemöller
bjp at informatik.uni-kiel.de
Wed Feb 10 14:09:38 UTC 2016
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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