[GHC] #15781: Extraneous parentheses required to parse kind signature on the RHS of a type synonym

[GHC]

#15781: Extraneous parentheses required to parse kind signature on the RHS of a
type synonym
-------------------------------------+-------------------------------------
        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Compiler          |              Version:  8.7
  (Parser)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D5245
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by Ryan Scott <ryan.gl.scott@…>):

 In [changeset:"79c641de60f1d6aa6f724d4fc49137ccbe3ab008/ghc" 79c641d/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="79c641de60f1d6aa6f724d4fc49137ccbe3ab008"
 Fix #15781 by using ktypedocs on type synonym RHSes

 Summary:
 This is a follow-up to D5173, which permitted
 unparenthesized kind signatures in certain places. One place that
 appeared to be overlooked was the right-hand sides of type synonyms,
 which this patch addresses by introducing a `ktypedoc` parser
 production (which is to `ctypdoc` as `ktype` is to `ctype`) and
 using it in the right place.

 Test Plan: make test TEST="KindSigs T15781"

 Reviewers: harpocrates, bgamari

 Reviewed By: harpocrates

 Subscribers: rwbarton, mpickering, carter

 GHC Trac Issues: #15781

 Differential Revision: https://phabricator.haskell.org/D5245
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15781#comment:2>
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