[Haskell-cafe] Again, version conflicting problem with cabal-install

[Andres Löh]

Hi.

On Fri, Feb 3, 2012 at 7:44 AM, Ivan Lazar Miljenovic
<ivan.miljenovic at gmail.com> wrote:
> On 3 February 2012 17:29, Magicloud Magiclouds
> <magicloud.magiclouds at gmail.com> wrote:
>> Thank you. The document does say it more clearly than me.
>> But still, currently, ghc only gives me one option: cannot be built.
>> How about giving me another one: throw away the version information of
>> D when building A. So when A uses types in D with B and C, it might
>> work. Just the risk is on me now.
>> It is not perfect, but would work sometimes....
>
> But not always.  We'd then have other errors: "why isn't this build working?"
>
> Types can be re-exported, class instances are implicitly imported/exported, etc.

It's a valid complaint, and there's ongoing work to fix some of these
issues. In the meantime, the development version of cabal-install, in
particular the new modular solver, can deal with a few situations that
can't be resolved by older cabal-install versions. I can't promise it
will help here. But I'm still interested in feedback.

Cheers,
  Andres