[GHC] #2530: deriving Show adds extra parens for constructor with record syntax

[GHC]

#2530: deriving Show adds extra parens for constructor with record syntax
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        Reporter:  spl               |                Owner:  bgamari
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  6.8.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D669
       Wiki Page:                    |
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Comment (by hvr):

 Fwiw, Changing GHCi's output after so many years is possibly disrupting to
 literature, as GHCi's output would look different from examples printed in
 books and tutorials.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/2530#comment:32>
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