wither the Platform

Edward Kmett ekmett at gmail.com
Sun Mar 22 13:06:07 UTC 2015

The original reason for the cabal hack that prevented it from trying to
reinstall template-haskell is that almost every time someone did this it
broke, silently. Then five packages later something would use template
haskell, and you'd get completely nonsensical error messages, and someone
_else_ would get the bug report. Sure there might have been a scenario in
which an expert who is working on ghc may want to reinstall the
template-haskell to get a new point release, but TH has never worked across
multiple GHC versions, and old versions shipped with very wide bounds.

Now, of course, maintainers and the trustees have the ability to
retroactively narrow bounds (and you've already done so for
template-haskell), so this view is dated. template-haskell should just be
reinstallable like everything else now.


On Sun, Mar 22, 2015 at 6:24 AM, Herbert Valerio Riedel <hvr at gnu.org> wrote:

> On 2015-03-22 at 11:17:21 +0100, Erik Hesselink wrote:
> [...]
> > I do this for template-haskell, since it's not possible to reinstall
> > but cabal would occasionally try it. I can imagine it would work well
> > to prevent the scenario you describe with network.
> Why isn't it possible to reinstall TH (unless you also need to depend on
> the `ghc` package)? We even explicitly allowed template-haskell to be
> reinstallable again in Cabal as there didn't seem any reason to forbid
> it anymore (it's no different than e.g. `bytestring` which is
> reinstallable as well):
> https://github.com/haskell/cabal/commit/ffd67e5e630766906e6f4c6655c067a79f739150
> Cheers,
>   hvr
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