[GHC] #7543: Constraint synonym instances

[GHC]

#7543: Constraint synonym instances
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        Reporter:  monoidal          |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.6.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by bheklilr):

 Has there been any more interest in this bug?  I happened to run across it
 for the first time today with a problem essentially identical to
 @ekmett's.  Any chance of it getting fixed one way or the other?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7543#comment:6>
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