Re: Elisp flet construct

[Daniel Kraft]

Daniel Kraft wrote:
> in the %nil thread a suggestion was brought up to support the `flet' 
> construct (and `flet*' as well, if we choose to do so at all, I favour) 
> in Guile's upcoming elisp implementation that behaves just like a let 
> for function-slot bindings, enabling dynamic scoping for them.
>
> It is no "official" elisp construct, but according to what I heard 
> there, can be useful at some times (I guess the use is mainly to locally 
> alter bindings of standard functions for some code executed without a 
> risk of permanently messing things up).  So I don't know how you regard 
> addition of "extensions"...?

Just a little addition to the subject of extensions:  I'd very much like 
to add lexical-let and lexical-let* as another set of extensions, 
because this gives the possibility to use "fast" lexical variables 
without the dynamic-scoping-fluid-pain.

Currently, I did implement some control constructs that could be done as 
macros still in the compiler directly (like prog1 or dolist) because 
there I can make use of lexical helper variables; lexical-let would 
allow using this feature directly from elisp (and implementing these 
constructs equivalently as macros).

So, what do you think about this extension?

Yours,
Daniel