Co-routines?

[Daniel C.]

On 7/3/06, Levi Pearson <levi at cold.org> wrote:
> The sort of language I think would be best for that kind of
> programming doesn't even exist right now, although I think it would
> draw at least a small community if it did exist.  So, until I get a
> research grant or something to write it myself, I can't choose to use
> it. :)
>
>                 --Levi

What language would that be?  (Let's call it L for naming convention's sake.)