Re: %nil once again

[Daniel Kraft]

Ken Raeburn wrote:
> On Jul 19, 2009, at 16:10, Neil Jerram wrote:
> > > BTW, I implemented also the function bindings of symbols using this
> > > fluid-based dynamic scoping at the moment -- but on second thought,
> > > there's no scoping at all for function slots (all are global), is
> > > there?
> >
> > No, I don't think there is.  `let' can't operate on function slots.
>
> Not in the main emacs lisp implementation.  However, cl-macs.el provides 
> an "flet" macro that does work on function slots; it uses the "letf" 
> macro which expands to include a use of unwind-protect to do its dirty 
> work.

But that's not part of the real "elisp semantics", and so if we don't 
want to include this as a genuine extension into Guile's compiler, we 
don't have to use the fluids for function slots.

With unwind-protect and friends one can, just like in emacs, implement 
this functionality, even without a fluid implementation.

However, if you agree that this would be a useful feature (dynamic 
scoping of functions) I can of course implement this as an extension to 
elisp...?  I agree that it might be of use sometimes, but am not 
convinced it is really "necessary".

Yours,
Daniel

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