Using head.hackage

Alejandro Serrano Mena trupill at
Tue Sep 10 07:55:27 UTC 2019

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.

Thanks in advance,
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