[GHC] #13526: -Wsimplifiable-class-constraints behaves differently with OVERLAPPING and OVERLAPPABLE

[GHC]

#13526: -Wsimplifiable-class-constraints behaves differently with OVERLAPPING and
OVERLAPPABLE
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        Reporter:  cocreature        |                Owner:  (none)
            Type:  bug               |               Status:  merge
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
                                     |  typecheck/should_compile/T13526
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by cocreature):

 Thank you for looking into this so quickly!

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13526#comment:4>
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