From: Alan Mackenzie <acm@muc.de>
To: Michael Heerdegen <michael_heerdegen@web.de>
Cc: "Mattias Engdegård" <mattiase@acm.org>,
"Eli Zaretskii" <eliz@gnu.org>,
61962-done@debbugs.gnu.org
Subject: bug#61962: 30.0.50; New trouble with symbols with positions
Date: Tue, 7 Mar 2023 10:24:41 +0000 [thread overview]
Message-ID: <ZAcQ6UrNEPUqtwsY@ACM> (raw)
In-Reply-To: <87a60p4d5q.fsf@web.de>
Hello, Michael.
On Tue, Mar 07, 2023 at 01:29:21 +0100, Michael Heerdegen wrote:
> Alan Mackenzie <acm@muc.de> writes:
> > I think I now understand what's going on. It's all to do with stripping
> > symbol positions in eval-and-compile forms. Before the patch of ~two
> > weeks ago, the positions were stripped in e-and-c. After the patch,
> > they weren't stripped.
> > I think the correct thing to do is to strip the symbol positions in the
> > `eval' part of eval-and-compile, but leave them alone in the `compile'
> > part. This is actually quite tricky, since
> > byte-run-strip-symbol-positions works destructively. So I need to copy
> > the code first, and there is no suitable function to do this. copy-tree
> > is close, but can't handle circular lists. So I will have to write a
> > safe version of copy tree.
> Sounds all plausible. I also don't have a better idea.
I've now written safe-copy-tree, and committed it together with the fix
in bytecomp.el to master. So I'm closing the bug with this post.
> > In the mean time, could you try out the following patch which uses
> > copy-tree as a first approximation. I think it fixes the problem,
> > apart from the above.
> Yes, looks good.
Thanks!
> I wonder now if other cases also suffer from the problem. What happens
> when I call `eval' in a macro expander (i.e. while generating the macro
> expansion, not in the result of an expansion)? And how does
> `cl-eval-when' behave (this is actually a special case of the first
> question) ?
I think these are so far unsolved problems with the
symbols-with-position mechanism - sometimes the s-w-p leaks out of macro
contexts. Are you seeing this problem in real life?
> Thanks so far,
> Michael.
--
Alan Mackenzie (Nuremberg, Germany).
next prev parent reply other threads:[~2023-03-07 10:24 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-04 16:18 bug#61962: 30.0.50; New trouble with symbols with positions Michael Heerdegen
2023-03-04 16:34 ` Eli Zaretskii
2023-03-04 21:39 ` Mattias Engdegård
2023-03-04 21:53 ` Michael Heerdegen
2023-03-05 16:04 ` Michael Heerdegen
2023-03-05 18:39 ` Alan Mackenzie
2023-03-05 19:41 ` Michael Heerdegen
2023-03-06 13:22 ` Alan Mackenzie
2023-03-07 0:29 ` Michael Heerdegen
2023-03-07 10:24 ` Alan Mackenzie [this message]
2023-03-07 13:13 ` Eli Zaretskii
2023-03-07 13:51 ` Robert Pluim
2023-03-07 15:46 ` Alan Mackenzie
2023-03-12 17:30 ` Mattias Engdegård
2023-03-12 20:42 ` Alan Mackenzie
2023-03-13 14:50 ` Eli Zaretskii
2023-03-14 12:31 ` Mattias Engdegård
2023-03-07 15:42 ` Alan Mackenzie
2023-03-07 15:15 ` Michael Heerdegen
2023-03-04 16:36 ` Eli Zaretskii
2023-03-04 16:47 ` Michael Heerdegen
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