[GHC] #8566: Given kind equalities are discarded

[GHC]

#8566: Given kind equalities are discarded
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        Reporter:  dreixel           |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.7
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:  polykinds/T8566   |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by simonpj):

 Maybe we could reject any data constructor whose type risks an existential
 kind equality (eg including the type-function thing you mention).  That
 would be conservative but safe.  Maybe with a flag to say "ok, drop the
 check and I'll deal with any bad error messages I get".  Would you like to
 try that?

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8566#comment:12>
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