[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:
            Type:  bug               |                  Status:  closed
        Priority:  lowest            |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  6.8.3
      Resolution:  fixed             |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:  Phab:D669
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Comment (by nomeata):

 JFTR if you come across this bug and are worried: A quick test shows that
 `read . show` still works fine, even if `read` and `show` come from
 different versions of GHC, in all combinations.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/2530#comment:27>
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