Earlier, Anthony Carrico wrote:
> 3. At first, I thought it would be possible to implement cmdline in
> terms of args-fold, but I believe the cmdline interface requires a
> "procedure-arity" implementation. This is a clever trick that takes
> advantage plt-scheme, but I think it also prevents cmdline from being
> implemented on most other Scheme systems.

Beyond this problem, are there other problems? One question I have: how
could one implement the once-any specifier in the cmdline.ss library?

Robby