Yes, sorry for that!

This is tracked in: https://ghc.haskell.org/trac/ghc/ticket/14989
Revert: https://phabricator.haskell.org/D4577 

- Michal

On Sun, Apr 8, 2018 at 11:08 AM Ömer Sinan Ağacan <omeragacan@gmail.com> wrote:
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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