patch applied (packages/base): FIX #4228 (atanh (-1) returns NaN instead of -Infinity)

[Ian Lynagh]

Mon Aug 16 14:36:54 PDT 2010  ghc at cainnorris.net
  * FIX #4228 (atanh (-1) returns NaN instead of -Infinity)

    M ./Data/Complex.hs -1 +1
    M ./GHC/Float.lhs -2 +2

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=packages/base;a=darcs_commitdiff;h=20100816213654-84712-17646cbe9c3814ce7cdfda409981c429bee169ee.gz