> > real2frac :: (Real a, Fractional b) => a -> b
> > real2frac = fromRational . toRational
>
> The composition of fromRational and toRational seems to be the
> only way to convert a Double or an Int to a Double.
>
> There is a function in the prelude, fromRealFrac, with exactly
> the same definition, but in the type signature, in place of Real
> it has RealFrac. This renders it useless as a replacement for
> my real2frac, as Int and Integer aren't instances of RealFrac.
That is odd. It looks like a bug to me. I'll suggest that
we change this in Standard Haskell.
Simon
