[GHC] #13231: ghc: panic! (the 'impossible' happened)

[GHC]

#13231: ghc: panic! (the 'impossible' happened)
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        Reporter:  aufheben          |                Owner:
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  MacOS X           |         Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by aufheben):

 * Attachment "yesod-auth-1.4.13.5.log" added.

 log file

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13231>
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