help migrating a tool that uses the ghc api

[Sam Halliday]

Thanks Tom,

It looks like head.hackage is for maintainers to opt-in to push patches
to accomodate ghc devs. It doesn't look like it's scanning everything
and it doesn't look like it's run as part of the ghc build, although I
am just trying to gleam this from the README so I could be wrong.

The discourse link, and the plan to publish snapshots of the compiler,
looks awesome. I'll be following along. I could then compile my code
weekly or monthly to try and catch breakages much closer to the time of
the change. I'm sure the gitlab CI could be setup to do this
automatically, although that may require some investigation. That would
help mitigate my fear that the API changes in a way that I can't recover
from.

Tom Ellis wrote:
> On Thu, May 18, 2023 at 10:05:34PM +0100, Sam Halliday wrote:
>> 1. some programming language communities have a "community build" that
>>    is periodically built by snapshots of the compiler. This allows
>>    unexpected regressions to be caught early in the dev cycle and would
>>    allow the author of refactor changes to send a courtesy patch to keep
>>    the broken code running if the change is intended to be kept in the
>>    compiler. I'd like to propose hsinspect for such a community build.
>
> Hi Sam, there are a couple of ways something like this could work:
>
> 1. Team GHC tracks a set of packages and can send fixes ahead of time.
>
> 2. Packages track GHC and can fix themselves ahead of time.
>
>
> I believe you're proposing 1, and I think it already exists:
>
>     http://ghc.gitlab.haskell.org/head.hackage/
>
> I understood that head.hackage ran on the entirety of Hackage so
> hsinspect[1] should have been picked up by it.  I lack a lot of
> knowledge about head.hackage though, so perhaps someone with more
> knowledge can chime in.
>
>
> If you're interested in 2 then the Haskell Foundation is working on
> making nightly builds of GHC accessible.  The latest I've heard is
> from David Christiansen (HF Executive Director) on Discourse:
>
>     https://discourse.haskell.org/t/haskell-foundation-february-2023-update/5896#requirements-gathering-for-nightly-releases-6
>
> If you're interested I suggest you get in touch with David (perhaps on
> that thread).
>
> Tom
>
>
> [1] https://hackage.haskell.org/package/hsinspect-0.0.18
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-- 
Best regards,
Sam
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