[GHC] #12380: ghc: panic! (the 'impossible' happened)

[GHC]

#12380: ghc: panic! (the 'impossible' happened)
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        Reporter:  Hassan58      |                Owner:
            Type:  bug           |               Status:  infoneeded
        Priority:  normal        |            Milestone:
       Component:  Compiler      |              Version:  7.10.3
      Resolution:                |             Keywords:
Operating System:  MacOS X       |         Architecture:  x86_64 (amd64)
 Type of failure:  None/Unknown  |            Test Case:
      Blocked By:                |             Blocking:
 Related Tickets:                |  Differential Rev(s):
       Wiki Page:                |
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Changes (by thomie):

 * status:  new => infoneeded


Comment:

 Hassan58: is the problem reproducible? Can you provide a way to reproduce
 it, preferably with a small program that doesn't have too many
 dependencies. Thanks.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12380#comment:2>
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