[GHC] #2759: Data.Generics.ConstrRep isn't general enough

[GHC]

#2759: Data.Generics.ConstrRep isn't general enough
---------------------------------+------------------------------------------
    Reporter:  guest             |       Owner:                  
        Type:  bug               |      Status:  new             
    Priority:  normal            |   Component:  Compiler        
     Version:  6.10.1            |    Severity:  minor           
    Keywords:                    |    Testcase:                  
Architecture:  Unknown/Multiple  |          Os:  Unknown/Multiple
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 The type ConstrRep in Data.Generics is used to represent constructors for
 types.
 The FloatConstr constructor is the one used for all kinds of floating
 point primitives.
 But FloatConstr has an argument of type Double.  This limits the primitive
 floating point types to those that are accurately representable as a
 Double.
 In other places in Haskell where an accurate and generic floating point
 value is needed the type Rational is used.  It should be used here too.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2759>
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