[GHC] #15156: Show instances for types exported from the ghc package

[GHC]

#15156: Show instances for types exported from the ghc package
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           Reporter:  sjakobi        |             Owner:  (none)
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:  8.6.1
          Component:  Compiler       |           Version:  8.2.2
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 In order to test and debug code that depends on the `ghc` package, it
 would be nice to have `Show` instances for the types it exports.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15156>
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