It seams that the CVS version of ghc (June 27) has problems finding
instances.   See the attached file Main.hs in a message I just sent to
the Haskell mailing list with a subject of "Second attempt for an STL
like library for Haskell".  If I don't import Eval it complains of not
being able to find an instance of Monad for Eval.Eval.

If this is not a known problem I have some additional examples I can
provide.  Just let me known.
-- 
Kevin Atkinson
[EMAIL PROTECTED]
http://metalab.unc.edu/kevina/

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