[GHC] #14417: Overly specific instances may not be resolved

[GHC]

#14417: Overly specific instances may not be resolved
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        Reporter:  dfeuer            |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.4.1
       Component:  Compiler (Type    |              Version:  8.3
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by dfeuer):

 * Attachment "BrokenSuper.trace" added.

 Results of -ddump-tc-trace

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14417>
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