From: Eduardo Ochs <eduardoochs@gmail.com>
To: help-gnu-emacs <help-gnu-emacs@gnu.org>
Subject: Lambdas for beginners broken - help, please
Date: Wed, 24 Jul 2024 05:43:38 -0300 [thread overview]
Message-ID: <CADs++6hazVbsNpy2YvXYWZTOmRG3FdmNrcX00KzUeVu5mS6WyA@mail.gmail.com> (raw)
Hi all,
I always present Emacs to beginners starting by Lisp, with this
approach:
http://anggtwu.net/eev-intros/find-eev-quick-intro.html#2
http://anggtwu.net/eev-intros/find-eev-quick-intro.html#3
and when I show Emacs to friends who are programmers - in some sense -
and they like it, I usually tell them to read my short tutorial on
elisp as soon as possible, and try its examples:
http://anggtwu.net/eev-intros/find-elisp-intro.html
But one or two days ago I compiled a current Emacs from git, and I saw
that many functions in eev don't work anymore. Apparently the problem
is here:
(info "(elisp)Function Cells")
https://www.gnu.org/software/emacs/manual/html_node/elisp/Function-Cells
Now the htmlized version of the manual says this,
(defun bar (n) (+ n 2))
(symbol-function 'bar)
;; -> (lambda (n) (+ n 2))
the current info manual says this,
(defun bar (n) (+ n 2))
(symbol-function 'bar)
;; -> #f(lambda (n) [t] (+ n 2))
and if I run the code myself(*) I get this:
(defun bar (n) (+ n 2))
(symbol-function 'bar)
;; -> #[(n) ((+ n 2)) nil]
I have lots of code and lots of tutorials that rely on the idea that
when lexical binding is nil then after a
(defun bar (n) (+ n 2))
the value of
(symbol-function 'bar)
will be a lambda expression in this sense,
(info "(elisp)Lambda Expressions")
http://www.gnu.org/software/emacs/manual/html_node/elisp/Lambda-Expressions
_as a list_, not as a "function object that is not a list".
What do I need to read to learn how to adapt my code to the new
behavior of Emacs?
Thanks in advance...
Eduardo Ochs
http://anggtwu.net/#eev
(*): I tried both the standard `C-x C-e' and my favorite way of
calling it, that uses the key `M-e' and `(eval <obj> t)'.
next reply other threads:[~2024-07-24 8:43 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-24 8:43 Eduardo Ochs [this message]
2024-07-24 13:12 ` Lambdas for beginners broken - help, please Michael Heerdegen via Users list for the GNU Emacs text editor
2024-07-24 16:43 ` Eduardo Ochs
2024-07-24 20:03 ` Michael Heerdegen via Users list for the GNU Emacs text editor
2024-07-24 22:06 ` Eduardo Ochs
2024-07-25 5:18 ` Eli Zaretskii
2024-07-25 9:44 ` Eduardo Ochs
2024-07-25 11:33 ` Eli Zaretskii
2024-07-25 12:49 ` Eduardo Ochs
2024-07-25 14:53 ` Eli Zaretskii
2024-07-24 16:54 ` tpeplt
2024-07-24 18:49 ` Michael Heerdegen via Users list for the GNU Emacs text editor
2024-07-24 19:29 ` tpeplt
2024-07-24 19:58 ` Michael Heerdegen via Users list for the GNU Emacs text editor
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