Unable to build on NixOS

[Ben Gamari]

Patrick Dougherty <patrick.doc at ameritech.net> writes:

> Huh,
>
> So this is a bug I thought I dealt with :/
> In the short term, I've found that often simply trying the build again
> can fix it. This is a dependency issue that I don't 100% understand.
>
I also encountered this (although it's rather unlikely to occur with
high build parallelism, which is how it snuck through validation).

Anyways, I filed #15197 and pushed D4753 as a possible workaround. I
believe the root cause is a bug in `ghc -M`'s treatment of ways.

Cheers,

- Ben

[1] https://phabricator.haskell.org/D4753

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