[GHC] #10836: Better error reporting for closed type families

[GHC]

#10836: Better error reporting for closed type families
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        Reporter:  jstolarek         |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.11
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |               Test Case:  T10836
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Changes (by jstolarek):

 * testcase:   => T10836


Comment:

 I added a test case (expected to fail).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10836#comment:1>
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