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From: Alan Mackenzie <acm@muc.de>
To: 59213@debbugs.gnu.org
Subject: bug#59213: Emacs 29: Edebug fails to instrument a parameter whose name begins with _
Date: Sat, 12 Nov 2022 09:35:58 +0000	[thread overview]
Message-ID: <Y29o/uABZE7n/u/3@ACM> (raw)

Hello, Emacs.

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.

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.

Just because a function doesn't use a particular argument (here
_old-len) doesn't mean the person debugging it isn't interested in its
value.  In this particular case, it was extremely interesting, because
beg and end were unequal, and _old-len was 3.

In the end, I found out the info with the d command (backtrace), but I
shouldn't have to.

-- 
Alan Mackenzie (Nuremberg, Germany).





             reply	other threads:[~2022-11-12  9:35 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-12  9:35 Alan Mackenzie [this message]
2022-11-14  2:48 ` bug#59213: Emacs 29: Edebug fails to instrument a parameter whose name begins with _ Michael Heerdegen
2022-11-14  3:53 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
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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