[GHC] #7263: Add derived Show instances to GHC.Generics

[GHC]

#7263: Add derived Show instances to GHC.Generics
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 Reporter:  dag               |          Owner:                  
     Type:  feature request   |         Status:  new             
 Priority:  normal            |      Component:  GHC API         
  Version:  7.6.1             |       Keywords:  generics        
       Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
  Failure:  None/Unknown      |       Testcase:                  
Blockedby:                    |       Blocking:                  
  Related:                    |  
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 This would make it easier to learn to use generics by exploration from
 GHCi.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7263>
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