[GHC] #13747: Can't use 'instance' keyword in associated type family instance

[GHC]

#13747: Can't use 'instance' keyword in associated type family instance
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        Reporter:  nh2               |                Owner:  erdeszt
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.2
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  error/warning at compile-time      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3673
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"007f255644f885d445e47e291e50eb12b5ecd08d/ghc" 007f255/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="007f255644f885d445e47e291e50eb12b5ecd08d"
 Allow optional instance keyword in associated type family instances

 Add the missing branch for parsing the optional 'instance' keyword
 in associated type family instance declarations.

 Fixes #13747

 Reviewers: austin, bgamari

 Reviewed By: bgamari

 Subscribers: simonpj, RyanGlScott, rwbarton, thomie, mpickering

 Differential Revision: https://phabricator.haskell.org/D3673
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13747#comment:3>
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