Hi Ken,
Ken Raeburn wrote:
On Jul 21, 2009, at 09:10, Daniel Kraft wrote:
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?
Is this modeled on the lexical-let work being done for Emacs (probably
to be merged for Emacs 24)? If so, I wouldn't call it an extension so
much as being compatible in advance. :-) And if not, you should
probably take a look at that work and make sure yours is compatible.
hm... I just found this page which is not decidedly about a planned
addition to emacs 24, but I think it is quite reasonable that this
addition will be the extension/feature described here:
http://www.delorie.com/gnu/docs/emacs/cl_21.html
This seems also (as far as I'm no expert on the details) to be just like
let behaves in Scheme and I plan to implement lexical-let just using
Guile's real let handling (not the dynamic one based on fluids crafted
for elisp) -- I hope this is "compatible".
If this is not quite correct, please point me to another source and/or
let me know the differences between Scheme's let to keep in mind!
Thanks, Daniel
--
Done: Arc-Bar-Cav-Ran-Rog-Sam-Tou-Val-Wiz
To go: Hea-Kni-Mon-Pri
