[GHC] #10789: Notify user when a kind mismatch holds up a type family reduction

[GHC]

#10789: Notify user when a kind mismatch holds up a type family reduction
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        Reporter:  goldfire          |                Owner:  ssequeira
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.0.2
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:  newcomer,
                                     |  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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Changes (by thoughtpolice):

 * milestone:  8.0.1 => 8.0.2


Comment:

 I'm bumping this to 8.0.2 and moving this from the 8.0.1 queue, since it's
 not critical but would be 'nice to have' for error messages.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10789#comment:7>
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