[GHC] #15658: strange inferred kind with TypeInType

[GHC]

#15658: strange inferred kind with TypeInType
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        Reporter:  dmwit             |                Owner:  (none)
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:  8.10.1
       Component:  Compiler          |              Version:  8.4.2
      Resolution:  fixed             |             Keywords:  TypeInType,
                                     |  GHCProposal,
                                     |  VisibleDependentQuantification
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #16326            |  Differential Rev(s):
       Wiki Page:                    |  https://gitlab.haskell.org/ghc/ghc/merge_requests/378
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Comment (by simonpj):

 Should we have a regression test here?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15658#comment:7>
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