Re: general lazy list facility for Emacs Lisp?

[Tassilo Horn <tassilo@member.fsf.org>]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

Hi Stefan,

> Emacs has had closures for "ever", tho it only closes over variables
> that are bound by `lexical-let' (provided by CL).  Emacs-24 will have
> a more integrated and efficient support for closures, by setting the
> `lexical-binding' variable which makes `let' bind lexically in the
> same way as in Common-Lisp.  You can try it out right now in the
> `lexbind-new' branch which is pretty much ready for inclusion (mostly
> lacks testing, and has currently 1 open bug apparently around eieio;
> additional testers are welcome).

I've started compiling and will report issues if I find one in my daily
use.  I guess, that there are many packages that won't work with
lexical-binding set to t, right?

I mean, at least I've seen code that uses let in order to save some
parameters, like

  (let ((foo "bar"))
    (function-that-does-something-with-foo))

without defvar-ing foo.  I might be wrong, but I think I remember
org-mode did so in some places...

Bye,
Tassilo