[GHC] #11474: incorrect redundant-constraints warning

[GHC]

#11474: incorrect redundant-constraints warning
-------------------------------------+-------------------------------------
        Reporter:  hvr               |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler (Type    |              Version:  8.0.1-rc1
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Incorrect         |            Test Case:
  warning at compile-time            |  tests/typecheck/should_compile/T11474.hs
      Blocked By:                    |             Blocking:
 Related Tickets:  #10100            |  Differential Rev(s):  Phab:D4739
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by sighingnow):

 * status:  new => patch
 * testcase:   => tests/typecheck/should_compile/T11474.hs
 * differential:   => Phab:D4739
 * related:   => #10100


Comment:

 This is indeed a duplicate of #10100, which was fixed in
 10fab31211961c9200d230556ec7742e07a6c831. However
 6eabb6ddb7c53784792ee26b1e0657bde7eee7fb introduced this regression.

 Now Phab:D4739 should fix this ticket.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11474#comment:6>
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