[Haskell-cafe] Getting containers updated in Stackage

Adam Bergmark adam at bergmark.nl
Sun Apr 2 10:47:20 UTC 2017

Hi David,

As far as I know stackage doesn't have a mechanism to say "this might cause
version mismatches but I promise it won't", is there even a way to do that
with Cabal (which stackage uses)?


On Sun, 2 Apr 2017 at 01:26 David Feuer <david.feuer at gmail.com> wrote:

> The fact that GHC needs to have its own containers shouldn't prevent a
> consistent package set from using a different one. The only hypothetical
> problem would be if the GHC API leaked containers types, but I'm pretty
> sure it doesn't: they're all wrapped up in newtypes and exported
> abstractly, unless someone's made a mistake.
> On Apr 1, 2017 6:09 PM, "Sven Panne" <svenpanne at gmail.com> wrote:
> 2017-04-01 20:53 GMT+02:00 David Feuer <david.feuer at gmail.com>:
> It's come to my attention that Stackage doesn't have the latest and
> greatest versions of containers. Stackage nightly is on, and I just
> released It'd be nice to get that fixed, but the containers
> maintainers do not have the time to take responsibility for Stackage
> curation. Could whoever's responsible please take care of it?
> If I see this correctly, there is nothing to take care of: Stackage
> nightly and LTS both ship GHC 8.0.2, and that contains containers
> When a new GHC is released and that ships with a new version of containers,
> it will be on Stackage. Apart from that, there is nothing you can do:
> Stackage is there to have a consistent set of packages, so containers is
> not even in
> https://github.com/fpco/stackage/blob/master/build-constraints.yaml,
> because it ships with GHC.
> That's at least my understanding...
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