[GHC] #11099: Incorrect warning about redundant constraints

[GHC]

#11099: Incorrect warning about redundant constraints
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        Reporter:  diatchki          |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  7.11
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by rwbarton):

 I understand why you don't want the warning, I'm just saying that the
 warning is working as designed. Perhaps it would be possible to divine the
 programmer's intent in this case and suppress the warning automatically.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11099#comment:3>
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