From: Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
To: Alan Mackenzie <acm@muc.de>
Cc: 59213@debbugs.gnu.org
Subject: bug#59213: Emacs 29: Edebug fails to instrument a parameter whose name begins with _
Date: Sun, 13 Nov 2022 22:53:12 -0500 [thread overview]
Message-ID: <jwvfsemi499.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <Y29o/uABZE7n/u/3@ACM> (Alan Mackenzie's message of "Sat, 12 Nov 2022 09:35:58 +0000")
> In Emacs 29 (not started with -Q, but...),
>
> I instrumented for edebug a function which looked like:
>
> (defun c-trim-found-types (beg end _old-len) ....)
>
> , the compilation being with lexical-binding: t.
>
> During the edebug session, I attempted
>
> e _old-len RET.
The behavior depends on where you are in the *Backtrace* buffer, because
each line in the backtrace can be in a different lexical scope.
So please clarify on which line you were when you did the above.
> Instead of giving me the value of _old-len (which was 3) it gave the
> error message
>
> Error: Symbol's value as variable is void: _old-len
>
> .. This is a bug.
Could be. Or could be that you were trying to use `_old-len` in
a lexical context where there is no such variable.
> Just because a function doesn't use a particular argument (here
I think the leading underscore is purely incidental and you'd get the
same behavior with `beg` and `end`.
Stefan
next prev parent reply other threads:[~2022-11-14 3:53 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-12 9:35 bug#59213: Emacs 29: Edebug fails to instrument a parameter whose name begins with _ Alan Mackenzie
2022-11-14 2:48 ` Michael Heerdegen
2022-11-14 3:53 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors [this message]
2022-11-14 10:28 ` Alan Mackenzie
2022-11-14 12:50 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-11-14 12:56 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-02-10 18:51 ` Alan Mackenzie
2023-02-10 22:05 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-02-11 7:26 ` Eli Zaretskii
2023-02-13 3:26 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-02-13 12:54 ` Eli Zaretskii
2023-02-11 11:17 ` Alan Mackenzie
2023-02-14 21:47 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-02-14 22:19 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-02-18 18:08 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-02-18 18:46 ` Alan Mackenzie
2023-02-20 22:21 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-11-15 13:08 ` Eli Zaretskii
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