[GHC] #2546: Reliable crash in checkBlackHoles

[GHC]

#2546: Reliable crash in checkBlackHoles
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    Reporter:  nogin     |        Owner:       
        Type:  bug       |       Status:  new  
    Priority:  normal    |    Milestone:       
   Component:  Compiler  |      Version:  6.8.2
    Severity:  critical  |   Resolution:       
    Keywords:  crash     |     Testcase:       
Architecture:  x86       |           Os:  Linux
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Comment (by nogin):

 This might be a dup of #1898 - will try upgrading to 6.8.3 to check if
 it's still there.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2546#comment:3>
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