[GHC] #5922: ghc told me to report it. after I change 'Show' in deriving to 'show'

[GHC]

#5922: ghc told me to report it. after I change 'Show' in deriving to 'show'
---------------------------------+------------------------------------------
    Reporter:  guest             |       Owner:              
        Type:  bug               |      Status:  new         
    Priority:  normal            |   Milestone:              
   Component:  Compiler          |     Version:  7.4.1       
    Keywords:                    |          Os:  Linux       
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown
  Difficulty:  Unknown           |    Testcase:              
   Blockedby:                    |    Blocking:              
     Related:                    |  
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Changes (by simonpj):

  * difficulty:  => Unknown


Comment:

 Thanks. Turns out it's already fixed, but I'll add a test case

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5922#comment:1>
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