[GHC] #12810: -Wredundant-constraints doesn't factor in associated type families

[GHC]

#12810: -Wredundant-constraints doesn't factor in associated type families
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        Reporter:  RyanGlScott       |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.0.1
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  error/warning at compile-time      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by goldfire):

 I agree with rwbarton in that you do not need the constraint. I think this
 is just #11369.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12810#comment:4>
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