[GHC] #8539: Data.Complex shouldn't use default implementation of (**)

[GHC]

#8539: Data.Complex shouldn't use default implementation of (**)
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        Reporter:  jjaredsimpson     |            Owner:
            Type:  bug               |           Status:  patch
        Priority:  low               |        Milestone:
       Component:  Prelude           |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  Incorrect result  |       Difficulty:  Easy (less than 1
  at runtime                         |  hour)
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by Scott Turner):

 > NaN!**0 :: Double equals 1 too.
 See [http://wikipedia.org/wiki/NaN#Signaling_NaN] for an exception to
 that. The same Wikipedia article has interesting things to say about 0!**0
 and infinity!**0 also.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8539#comment:21>
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