From: Dave Goel <deego3@gmail.com>
To: "Gerd Möllmann" <gerd.moellmann@gmail.com>,
"Dave Goel" <deego3@gmail.com>
Cc: 66940@debbugs.gnu.org
Subject: bug#66940: Dynamic scoping is all weird now?
Date: Sun, 5 Nov 2023 15:21:25 -0500 [thread overview]
Message-ID: <CAOCW0Dja5JrJHT1fTyES3jmvL_kR2MtTj24rLNXe8A_SGM32vw@mail.gmail.com> (raw)
In-Reply-To: <CAOCW0DiDypdSdpK38f94LS0rqGAC7LUtE5f9UqeUTzaRXFEbbQ@mail.gmail.com>
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Here's the simplest MRE I have so far -
(progn
(setq lexical-binding nil)
(let ((ii 1))
(defmacro mac ()
`(message "%S" ,ii)
)
(mac)))
Eval it three times, using C-x C-e.
Error on the third time.
(Following the prior response, I figured I will discuss on devel first to
confirm before officially reporting it, but was kinda directed back here.)
On Sun, Nov 5, 2023 at 2:07 PM Dave Goel <deego3@gmail.com> wrote:
> Gerd,
>
> Ok.
>
> I hope this bugreport is clearer -
>
> Here's some code.
>
> The variable ii is clearly set every time mac was defined OR called.
>
> backquote should expand, and mac should have read its content as (list
> 'message "%S" ii).
>
>
>
>
> (progn
> (setq lexical-binding nil)
>
> (dotimes (ii 10)
> (defmacro mac ()
> `(message "%S" ,ii)
> )
> (let
> ((old_ii ii))
> (setq ii 33)
> (mac)
> (setq ii old_ii)
> )))
>
>
> You eval this code once. It works.
> You eval this again. It works.
> The third time, though, it lands you in the debugger. The very same code.
> Why the third time? And, why the debugger? ii is well set every time it is
> used.
>
> That was bug (b). That's clearly an emacs bug?
>
>
> Here's (c) -
>
> The third time, change every "ii" to "var" ,and change every "old_ii" to
> "old_var".
> And, evaluate it.
> We still get the very same error, but the error involves ii, not var. The
> code we are defining and eval'ing has no "ii" whatsoever. It should have
> forgotten the old mac that involved ii. We defined a new mac involving
> "var."
>
>
>>
>>
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next prev parent reply other threads:[~2023-11-05 20:21 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-05 4:06 bug#66940: Dynamic scoping is all weird now? Dave Goel
2023-11-05 4:09 ` 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 [this message]
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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