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

[GHC]

#2530: deriving Show adds extra parens for constructor with record syntax
-------------------------------------+-------------------------------------
        Reporter:  spl               |                Owner:
            Type:  bug               |               Status:  new
        Priority:  lowest            |            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:                    |
-------------------------------------+-------------------------------------
Changes (by hvr):

 * status:  closed => new
 * resolution:  fixed =>


Comment:

 Btw, this also affects how GHCi displays results:

 {{{
 GHCi, version 8.0.0.20160204: http://www.haskell.org/ghc/  :? for help
 Loaded GHCi configuration from /home/hvr/.ghci

 λ:1> data T = C { f1, f2 :: () } deriving Show
 data T = C {f1 :: (), f2 :: ()}
 f1 :: T -> ()
 f2 :: T -> ()

 λ:2> Just (C () ())
 Just C {f1 = (), f2 = ()}
 it :: Maybe T

 λ:3>
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/2530#comment:30>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler