[GHC] #15591: Inconsistent kind variable binder visibility between associated and non-associated type families

[GHC]

#15591: Inconsistent kind variable binder visibility between associated and non-
associated type families
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        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.5
      Resolution:                    |             Keywords:
                                     |  TypeApplications, TypeFamilies
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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Comment (by RyanGlScott):

 If nothing else, `ZT` has shown me that my patch in comment:1 isn't
 sufficient to fix the underlying issue in the first place. If I comment
 out the default equation for `ZT`, then `:kind ZT` still gives me `forall
 {k}. Maybe k`, with or without the patch. Back to the drawing board...

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15591#comment:2>
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