[GHC] #11427: superclasses aren't considered because context is no smaller than the instance head

[GHC]

#11427: superclasses aren't considered because context is no smaller than the
instance head
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        Reporter:  phadej            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1-rc1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 See also #11762 for another example.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11427#comment:11>
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