[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 Richard Eisenberg <rae@…>):

 In [changeset:"7aa000b625c677534c87da43de31c27a2b969183/ghc"
 7aa000b6/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="7aa000b625c677534c87da43de31c27a2b969183"
 Fix #13391 by checking for kind-GADTs

 The check is a bit gnarly, but I couldn't think of a better way.
 See the new code in TcTyClsDecls.

 test case: polykinds/T13391
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13391#comment:9>
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