Taylor R Campbell wrote:
>    Date: Fri, 18 Sep 2009 15:51:57 -0400
>    From: David Van Horn <xxxxxx@cs.brandeis.edu>
>
>    In a system that uses random-access lists everywhere, you would not need
>    conversions.  In a system that doesn't, these are easy to portably
>    define.  So now I'm not sure what your concern is.
>
> I want to be able to write portable programs that can take advantage
> of systems with only random-access lists, but that can run on other
> systems as well by converting between sequential lists and random-
> access lists.  `Take advantage' here means using identity conversions.
> Of course I can define copying conversions portably and use those, but
> that wouldn't take advantage of systems whose lists are all
> random-access.

I see;  I will add these operations in the next iteration.  Thanks.

David