[GHC] #9708: Type inference non-determinism due to improvement

[GHC]

#9708: Type inference non-determinism due to improvement
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        Reporter:  simonpj           |                Owner:  diatchki
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  7.8.3
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
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Comment (by Thomas Miedema <thomasmiedema@…>):

 In [changeset:"2c6fe5b8a854f06ea9574f7dca545b4c2d35b811/ghc"
 2c6fe5b8/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="2c6fe5b8a854f06ea9574f7dca545b4c2d35b811"
 Add -fwarn-redundant-constrains to test for #9708

 Fixes validate on Travis.

 Reviewed by: bgamari

 Differential Revision: https://phabricator.haskell.org/D1834
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9708#comment:4>
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