[GHC] #16085: ffi018_ghci fails when unregisterised

[GHC]

#16085: ffi018_ghci fails when unregisterised
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        Reporter:  bgamari           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.8.1
       Component:  Compiler          |              Version:  8.6.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 Hmm, I have also seen this same issue in the `foreignInterruptible` and
 `T7040_ghci` tests, also non-deterministically.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16085#comment:3>
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