From: Dave Goel <deego3@gmail.com>
To: 66940@debbugs.gnu.org, deego3@gmail.com
Subject: bug#66940: Dynamic scoping is all weird now?
Date: Sun, 5 Nov 2023 00:06:49 -0400 [thread overview]
Message-ID: <CAOCW0DjzvUWDO4NhtUiPjahAh7Jwn_T=up=26Gu+KQmMubzF7Q@mail.gmail.com> (raw)
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I was playing around, checking my sanity re : dynamic scoping. I'm
probably rusty, but I could swear that on older emacsen, this sort of code
would print 33 ten times.
On emacs -Q with debian stable (28.2).
I try this
(progn
(setq lexical-binding nil)
(dotimes (ii 10)
(defmacro mac ()
`(message "%S" ,ii)
(sit-for 0.1))
(let ((old_ii ii))
(setq ii 33)
(mac)
(setq ii old_ii)
)))
Exits without error the first two times, although, strangely, i don't see
any messages the second time. (I expected to see ten 33's).
*(a) As in, the second time, it doesn't print 33 ten times, as we would
expect.*
*(b) The third time is stranger. *
Let's evaluate it a third time! The third time is even weirder.
The third time, it complains
Debugger entered--Lisp error: (void-variable ii)
(list 'message "%S" ii)
(lambda nil (list 'message "%S" ii) (list 'print ii) (sit-for 0.1))()
macroexpand((mac) nil)
macroexp-macroexpand((mac) nil)
macroexp--expand-all((mac))
macroexp--all-forms(((setq ii 33) (mac) (setq ii old_ii)))
macroexp--expand-all((let ((old_ii ii)) (setq ii 33) (mac) (setq ii
old_ii)))
and so on.
The bug(?) was reproduced on 29.1 as well - by e1f on #emacs
*(c) It gets even funnier. e1f changed ii to var, but the third time, it
still complained about ii, with the above error message, and not about var.*
I reproduced that as well.
Dave
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next reply other threads:[~2023-11-05 4:06 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-05 4:06 Dave Goel [this message]
2023-11-05 4:09 ` bug#66940: Dynamic scoping is all weird now? Dave Goel
2023-11-05 6:04 ` Gerd Möllmann
2023-11-05 6:58 ` Dave Goel
2023-11-05 7:25 ` Gerd Möllmann
2023-11-05 8:12 ` Dave Goel
2023-11-05 8:39 ` Gerd Möllmann
2023-11-05 19:07 ` Dave Goel
2023-11-05 20:21 ` Dave Goel
2023-11-06 1:52 ` Michael Heerdegen
2023-11-06 6:25 ` Gerd Möllmann
2023-11-06 16:49 ` Drew Adams
2023-11-06 6:57 ` Dave Goel
2023-11-07 5:59 ` Michael Heerdegen
2023-11-08 2:49 ` Dave Goel
2023-11-08 3:08 ` Michael Heerdegen
2023-11-08 3:21 ` Dave Goel
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