GNU bug report logs - #59213
Emacs 29: Edebug fails to instrument a parameter whose name begins with _

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From: Alan Mackenzie <acm <at> muc.de>
To: 59213 <at> 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

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).

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