[GHC] #8729: Compile crashed with panic! (the 'impossible' happened)

[GHC]

#8729: Compile crashed with panic! (the 'impossible' happened)
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       Reporter:  zabirauf           |             Owner:
           Type:  bug                |            Status:  new
       Priority:  high               |         Milestone:
      Component:  Compiler           |           Version:  7.4.1
       Keywords:  panic! impossible  |  Operating System:  Linux
  compiler crash                     |   Type of failure:  Compile-time
   Architecture:  x86_64 (amd64)     |  crash
     Difficulty:  Unknown            |         Test Case:
     Blocked By:                     |          Blocking:
Related Tickets:                     |
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 The following code results in a compiler crash with error
 ghc: panic! (the 'impossible' happened)
   (GHC version 7.4.1 for x86_64-unknown-linux):
         nameModule show{tv a9N}

 Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

 The code can be found at [http://pastie.org/8692515]

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8729>
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