[GHC] #4228: atanh (-1) returns NaN instead of -Infinity

[GHC]

#4228: atanh (-1) returns NaN instead of -Infinity
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    Reporter:  sbroadhead        |        Owner:                             
        Type:  bug               |       Status:  new                        
    Priority:  normal            |    Milestone:  6.14.1                     
   Component:  Prelude           |      Version:  6.12.1                     
    Keywords:                    |     Testcase:                             
   Blockedby:                    |   Difficulty:                             
          Os:  Unknown/Multiple  |     Blocking:                             
Architecture:  Unknown/Multiple  |      Failure:  Incorrect result at runtime
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Changes (by kfrdbs):

 * cc: kfrdbs@… (added)


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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4228#comment:2>
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