Hi, I see a lot of these errors in slow validate using current GHC HEAD:
ghc: panic! (the 'impossible' happened)
(GHC version 8.5.20180407 for x86_64-unknown-linux):
Each block should be reachable from only one ProcPoint
This wasn't happening ~10 days ago. I suspect it may be D4417 but I haven't
checked.
Ömer
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