[GHC] #9562: Type families + hs-boot files = unsafeCoerce

[GHC]

#9562: Type families + hs-boot files = unsafeCoerce
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        Reporter:  goldfire          |                   Owner:  ezyang
            Type:  bug               |                  Status:  new
        Priority:  high              |               Milestone:
       Component:  Compiler          |                 Version:  7.8.3
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  GHC accepts       |  Unknown/Multiple
  invalid program                    |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:  #10270            |  Differential Revisions:
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Comment (by Edward Z. Yang <ezyang@…>):

 In [changeset:"23582b0c16bb147dad6bd7dee98686a8b61eacea/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="23582b0c16bb147dad6bd7dee98686a8b61eacea"
 Add failing test for #9562.

 Signed-off-by: Edward Z. Yang <ezyang at cs.stanford.edu>
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9562#comment:12>
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