[GHC] #16263: GHC accepts illegal constraint in kind

[GHC]

#16263: GHC accepts illegal constraint in kind
-------------------------------------+-------------------------------------
        Reporter:  goldfire          |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.8.1
       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:                    |
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Changes (by RyanGlScott):

 * keywords:  TypeInType => TypeInType, newcomer
 * milestone:   => 8.8.1


Comment:

 Luckily, commit 2257a86daa72db382eb927df12a718669d5491f8 (`Taming the Kind
 Inference Monster`) has already fixed this in GHC HEAD:

 {{{
 $ ~/Software/ghc5/inplace/bin/ghc-stage2 --interactive -XPolyKinds
 -XDataKinds
 GHCi, version 8.7.20190128: https://www.haskell.org/ghc/  :? for help
 Loaded GHCi configuration from /home/rgscott/.ghci
 λ> import Data.Kind
 λ> data Q :: Eq a => Type

 <interactive>:2:1: error: Illegal constraint in a kind: Eq a => *
 }}}

 We just need a regression test.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16263#comment:1>
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