[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 request   |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.2.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by alexbiehl):

 While 'show' would be nice for now you can use 'ppr' and 'showSDocUnsafe'
 from 'Outputable'.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15156#comment:1>
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