Re: [stack] language hierarchy

On Dec 11, 2007 10:44 AM, John Cowan <[email protected]> wrote:
>
> William Tanksley, Jr scripsit:
> > > How about "self" as a call to its enclosing context?
> >
> > It won't work for dynamic definitions, because there's no distinct
> > concept of "enclosing context". All you know is that you're inside a
> > quotation that's inside another quotation; you can't look ahead to see
> > which enclosure is the one being defined and/or executed. There are
> > several solutions:
>
> [snippage]
>
> 4. Fall back on the Y combinator, or its eager equivalent Z.

I am familiar with Y but not Z. How is Z defined?

- Christopher