Using head.hackage

[Alejandro Serrano Mena]

Note that this only happens with `aeson`, which is the package that the
tutorial asks to add to `extra-packages` in 'cabal.project'.

El mar., 10 sept. 2019 a las 19:17, Alejandro Serrano Mena (<
trupill at gmail.com>) escribió:

> The instructions are quite clear. Alas, when I try to reproduce the steps
> using my home-build compiler (for which I mean set the `with-compiler` in
> `cabal.project` to the stage2 compiler obtained by Hadrian), I get:
>
> > cabal new-install --lib aeson
> Distribution/Client/CmdInstall.hs:(361,18)-(363,72): Non-exhaustive
> patterns in lambda
>
> Do you have any idea of what I might be doing wrong?
>
> Thanks in advance,
> Alejandro
>
> El mar., 10 sept. 2019 a las 12:32, Ben Gamari (<ben at smart-cactus.org>)
> escribió:
>
>> Alejandro Serrano Mena <trupill at gmail.com> writes:
>>
>> > Dear GHC devs,
>> > As part of our work in "quick look impredicativity", we would like to
>> test
>> > whether any package breaks. I've read about "head.hackage" as a way to
>> test
>> > this fact, but I could not find any information.
>> >
>> > Could somebody point me in the right direction? If it does not exist
>> yet,
>> > I'll try to summarize whatever I learn in the wiki for future reference.
>> >
>> Hi Alejandro,
>>
>> Indeed I have a pair of yet-to-be-published blog posts intended to
>> discuss exactly this. See [1] and [2]. Do let me know if you have any
>> questions.
>>
>> Cheers,
>>
>> - Ben
>>
>>
>> [1] https://gitlab.haskell.org/ghc/homepage/merge_requests/16/diffs
>> [2] https://gitlab.haskell.org/ghc/homepage/merge_requests/29/diffs
>>
>
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