[GHC] #13391: PolyKinds is more permissive in GHC 8

[GHC]

#13391: PolyKinds is more permissive in GHC 8
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        Reporter:  crockeea          |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.2
      Resolution:                    |             Keywords:  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC accepts       |  Unknown/Multiple
  invalid program                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3859
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"bbb8cb92b66d83bb7d472e7905c84c28cbb0997c/ghc"
 bbb8cb92/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="bbb8cb92b66d83bb7d472e7905c84c28cbb0997c"
 users-guide: Mention changes necessary due to #13391

 Some variant of this should also be added to the migration guide.

 [skip ci]

 Test Plan: Read it

 Reviewers: goldfire, austin

 Reviewed By: goldfire

 Subscribers: rwbarton, thomie

 GHC Trac Issues: #13391

 Differential Revision: https://phabricator.haskell.org/D3966
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13391#comment:8>
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