[GHC] #10534: Data families + Coercible = unsafeCoerce

[GHC]

#10534: Data families + Coercible = unsafeCoerce
-------------------------------------+-------------------------------------
        Reporter:  goldfire          |                   Owner:
            Type:  bug               |                  Status:  merge
        Priority:  highest           |               Milestone:  7.10.2
       Component:  Compiler          |                 Version:  7.10.2-rc1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |  typecheck/should_fail/T10534
                                     |                Blocking:
                                     |  Differential Revisions:  Phab:D992
-------------------------------------+-------------------------------------

Comment (by goldfire):

 Yes, of course. The bigger patch has run into a few validation problems
 that I'm working through. I fully expect to land today.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10534#comment:5>
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