[GHC] #8532: Hyperbolic arc cosine fails on (-1) :: Complex r.

[GHC]

#8532: Hyperbolic arc cosine fails on (-1) :: Complex r.
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        Reporter:  leftaroundabout   |            Owner:
            Type:  bug               |           Status:  new
        Priority:  low               |        Milestone:
       Component:  libraries/base    |          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:  acosh(-1) ::      |       Blocked By:
  Complex Double                     |  Related Tickets:
        Blocking:                    |
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Comment (by carter):

 does this behave as expected in the a small radius around -1?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8532#comment:1>
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