[GHC] #8163: ghc.exe: panic! (the 'impossible' happened)

[GHC]

#8163: ghc.exe: panic! (the 'impossible' happened)
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        Reporter:  CodeGuru            |            Owner:
            Type:  bug                 |           Status:  closed
        Priority:  normal              |        Milestone:
       Component:  Compiler            |          Version:  7.4.2
      Resolution:  duplicate           |         Keywords:
Operating System:  Windows             |     Architecture:
 Type of failure:  Compile-time crash  |  Unknown/Multiple
       Test Case:                      |       Difficulty:  Unknown
        Blocking:                      |       Blocked By:
                                       |  Related Tickets:
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Changes (by monoidal):

 * status:  new => closed
 * resolution:   => duplicate


Comment:

 This is a known error, it should be `deriving (Show)`. It is fixed in GHC
 7.6; see #5961 and [[ReportABug]].

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8163#comment:2>
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