Using head.hackage

Ben Gamari ben at
Tue Sep 10 10:32:59 UTC 2019

Alejandro Serrano Mena <trupill at> 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


- Ben

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