[GHC] #16263: Rework GHC's treatment of constraints in kinds

[GHC]

#16263: Rework GHC's treatment of constraints in kinds
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        Reporter:  goldfire          |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.10.1
       Component:  Compiler          |              Version:  8.6.3
      Resolution:                    |             Keywords:  TypeInType,
                                     |  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |  https://gitlab.haskell.org/ghc/ghc/merge_requests/128
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Comment (by simonpj):

 > By "this kind", I assume you mean Eq a => Type from the original
 example? If so, yes, rejecting that (and adding a test case for it) would
 be wonderful.

 Yes, exactly.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16263#comment:9>
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