[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:  bgamari
            Type:  bug               |               Status:  patch
        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:                    |  Phab:D2027
-------------------------------------+-------------------------------------

Comment (by Ben Gamari <ben@…>):

 In [changeset:"1448f8ab2379452312f1f74f6d5ba4de8ad3d47e/ghc"
 1448f8ab/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="1448f8ab2379452312f1f74f6d5ba4de8ad3d47e"
 Show: Restore redundant parentheses around records

 As discussed in #2530 we are going to continue to produce parentheses
 here in order to preserve compatibility with previous GHC releases. It
 was found that dropped parentheses would break some testsuites which
 compared against output from Show. This has been documented in the users
 guide.

 This reverts commit 5692643c9d17e746327588cd6157a923642b7975.

 Test Plan: Validate

 Reviewers: hvr, austin

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D2027

 GHC Trac Issues: #2350
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/2530#comment:39>
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