not a solution to your problem, but covers all your tests,
as well as one more that would inevitably have followed:-)
cheers,
claus
Twice.hs
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Over on comp.lang.functional ( http://xrl.us/s6kv ), Toby Kelsey is
wondering about writing a function twice that applies a function to an
argument two times...
twice' :: (a - a) - a - a
twice' f x = f (f x)
...that works for things like twice succ 0 and twice tail [1,2,3],
but the type
