"includes/RtsAPI.h" did not exist on "master"

Spurious failures due to intermittent stack concurrency bug

We have spurious failures because of https://github.com/commercialhaskell/stack/issues/6388.

What's not clear to me is why a package that required a call to updateHackageIndex in one run did not require the call in a different run. I would expect the set of packages that trigger the call to be fixed. Are we caching the Pantry database?

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