[GHC] #14646: GHC 8.4.1 regression: rank-n types no longer parenthesized when pretty-printed

[GHC]

#14646: GHC 8.4.1 regression: rank-n types no longer parenthesized when pretty-
printed
-------------------------------------+-------------------------------------
        Reporter:  RyanGlScott       |                Owner:  RyanGlScott
            Type:  bug               |               Status:  patch
        Priority:  high              |            Milestone:  8.4.1
       Component:  GHC API           |              Version:  8.4.1-alpha1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D4298
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"f380115cd834ffbe51aca60f5476a51b94cdd413/ghc" f380115/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="f380115cd834ffbe51aca60f5476a51b94cdd413"
 Parenthesize forall-type args in cvtTypeKind

 Trac #14646 happened because we forgot to parenthesize `forall` types to
 the left of an arrow. This simple patch fixes that.

 Test Plan: make test TEST=T14646

 Reviewers: alanz, goldfire, bgamari

 Reviewed By: alanz

 Subscribers: rwbarton, thomie, carter

 GHC Trac Issues: #14646

 Differential Revision: https://phabricator.haskell.org/D4298
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14646#comment:9>
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