[GHC] #12447: Pretty-printing of equality `~` without parentheses

[GHC]

#12447: Pretty-printing of equality `~` without parentheses
-------------------------------------+-------------------------------------
        Reporter:  Iceland_jack      |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      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:                    |
-------------------------------------+-------------------------------------

Comment (by Ben Gamari <ben@…>):

 In [changeset:"b98dbdf667744c288f03525d5e012563d31143ce/ghc" b98dbdf/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="b98dbdf667744c288f03525d5e012563d31143ce"
 testsuite: Add (still broken) testcase for #12447

 Test Plan: Validate

 Reviewers: austin

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D2703

 GHC Trac Issues: #12447
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12447#comment:3>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler