[GHC] #14633: -fwarn-redundant-constraints false positive

[GHC]

#14633: -fwarn-redundant-constraints false positive
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        Reporter:  ghorn             |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.2
      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 ghorn):

 Sounds like GHC 8.2 improved its warnings and exposed a problem with my
 code

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14633#comment:2>
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