[GHC] #10367: "ghc: panic! (the 'impossible' happened)"

[GHC]

#10367: "ghc: panic! (the 'impossible' happened)"
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        Reporter:  bgwines        |                Owner:  (none)
            Type:  bug            |               Status:  new
        Priority:  normal         |            Milestone:
       Component:  Code Coverage  |              Version:  7.10.1
      Resolution:                 |             Keywords:  panic
Operating System:  MacOS X        |         Architecture:  Unknown/Multiple
 Type of failure:  Runtime crash  |            Test Case:
      Blocked By:                 |             Blocking:
 Related Tickets:                 |  Differential Rev(s):
       Wiki Page:                 |
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Comment (by George):

 Is this still reproducible?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10367#comment:3>
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