Known bugs in Hugs

There are a couple of known bugs in Hugs which aren't mentioned on the
bugs page, or in the documentation section on the differences between
Hugs98 and Haskell 98.

1. Hugs doesn't support Rational constants:

      Prelude> 1.0e27 :: Rational
      999999988484154753734934528 % 1

2. Hugs's implementation of the monomorphism restriction differs from
   the spec (discussed a few months back).

Also, the documentation still claims that some libraries don't exist
(Directory, Time, CPUTime), and mentions some other libraries which
aren't part of Haskell 98 (Bit, Nat, Signed).

Cheers,
	Simon