New slow validate errors

Ömer Sinan Ağacan omeragacan at
Sun Apr 8 09:07:46 UTC 2018


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


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