It wasn't your main question, but I'd like to respond to one point that
you raised:
| (Works with ghc. Doesn't work with Hugs because of incompatible Random
| module (?).)
The Haskell 98 Random library changed quite significantly, and we didn't
get to do anything about it before the last pre-release of Hugs 98 in
March. I'm happy to report that the official release of Hugs 98 will
include an updated version of Random, so you should soon be able to get
your code running under Hugs too.
All the best,
Mark
