[GHC] #4986: negative Double numbers print out all wrong

[GHC]

#4986: negative Double numbers print out all wrong
-------------------------------+--------------------------------------------
    Reporter:  vincef13        |       Owner:                         
        Type:  bug             |      Status:  new                    
    Priority:  normal          |   Component:  Compiler               
     Version:  7.0.1           |    Keywords:                         
    Testcase:                  |   Blockedby:                         
          Os:  MacOS X         |    Blocking:                         
Architecture:  x86_64 (amd64)  |     Failure:  Runtime performance bug
-------------------------------+--------------------------------------------
 Prelude> (-1) :: Double
 -3.666940035476786e76

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4986>
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