Folks
I'm back to tidying up the Haskell Report.
In the Numeric library, there is the useful function
readFloat :: RealFloat a => ReadS a
But you can't use it for reading rationals, because Rational
isn't in RealFloat!
This is a Royal Pain, and entirely unnecessary. In fact,
readFloat uses only operations from the RealFrac class,
so it could equally well have type
readFloat :: RealFrac a => ReadS a
I'm strongly inclined to make this change. It breaks no
programs, and it fixes a real bug i.e. there is no way to
read a "103" as a Rational.
Simon
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