[GHC] #14085: powModInteger sometimes ignores sign of argument

[GHC]

#14085: powModInteger sometimes ignores sign of argument
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        Reporter:  ocheron           |                Owner:  ocheron
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Core Libraries    |              Version:  8.2.1
      Resolution:                    |             Keywords:  integer-gmp
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3826
       Wiki Page:                    |
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Comment (by bgamari):

 Nice catch and thanks for working on a fix.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14085#comment:3>
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