[GHC] #9973: Erroneous Redundant constraint warning

[GHC]

#9973: Erroneous Redundant constraint warning
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        Reporter:  alanz             |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.11
      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 Simon Peyton Jones <simonpj@…>):

 In [changeset:"dd3e1dd7f8d81e2585a7d63c06c1a1501810fcaa/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="dd3e1dd7f8d81e2585a7d63c06c1a1501810fcaa"
 Fix Trac #9973 (buglet in -fwarn-redundant-constraints)
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9973#comment:1>
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