Enum class

[Ch. A. Herrmann]

    John> I think the problem is that Enum in haskell means not only
    John> enumerable types, but types which have enumerable subsets when
    John> taken with an incrementer. which the reals satisfy.

This is a good justification.

    John> this can be demonstrated by things like [1.0, 1.1 ..]  which is
    John> obviously equinumerous to the integers.

I'd prefer to write [ 1.0 + fromIntegral i / 10 | i<-[0..n] ] since you
can be sure that the list has (n+1) elements (if n>=0).

Cheers
Christoph