[GHC] #15810: Kind inference error in classes

[GHC]

#15810: Kind inference error in classes
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           Reporter:  goldfire       |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.6.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 This is rejected today, but it shouldn't be:

 {{{#!hs
 class C a where
   meth :: Proxy (a :: k)
 }}}

 It's the kind signature that kills it.

 Expected solution: change `tcImplicitTKBndrs` to `kcImplicitTKBndrs` in
 `kcHsKindSig`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15810>
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