Using head.hackage

Jan van Brügge jan at
Tue Sep 10 08:47:55 UTC 2019

Hi Alejandro,
I don't know if this helps, but you can find some documentation in the repo:

Am 10. September 2019 09:55:27 MESZ schrieb Alejandro Serrano Mena <trupill at>:
>Dear GHC devs,
>As part of our work in "quick look impredicativity", we would like to
>whether any package breaks. I've read about "head.hackage" as a way to
>this fact, but I could not find any information.
>Could somebody point me in the right direction? If it does not exist
>I'll try to summarize whatever I learn in the wiki for future
>Thanks in advance,

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