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

[GHC]

#10534: Data families + Coercible = unsafeCoerce
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        Reporter:  goldfire          |                   Owner:
            Type:  bug               |                  Status:  patch
        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:                    |                Blocking:
                                     |  Differential Revisions:  Phab:D992
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Comment (by Richard Eisenberg <eir@…>):

 In [changeset:"89c7168c150ccc38a2e6dd4a3aea555616722260/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="89c7168c150ccc38a2e6dd4a3aea555616722260"
 Fix #10534

 Test case: typecheck/should_fail/T10534
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10534#comment:2>
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