Debugging Elisp: debug-on-message - How to make it work?
reddit / emacs

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pragmat1c1 · 2022-05-16 12:12

I am having trouble pinpointing an error. When I hit "L" for follow-
mode in org-agenda, I see the message " Wrong number of arguments: (0
. 0), 1" in the \*Messages\* buffer and in the "echo area".

Now running "edebug-defun" in the function definition for "org-agenda-
follow-mode" and stepping through the code, I don't see any error.  I
am guessing that the error stems from another function, a hook or
adviced function. But I don't know where.

So I checked this:
[https://www.gnu.org/software/emacs/manual/html\_node/elisp/Error-Debu
gging.html](https://www.gnu.org/software/emacs/manual/html_node/elisp/
Error-Debugging.html)

and tried

    (setq debug-on-message "Wrong number of arguments: (0 . 0), 1")

still the debugger is not entered.

How else can I trigger the debugger to pinpoint the source of the
error?

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_viz_ · 2022-05-16 12:14

toggle-debug-on-error?

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pragmat1c1 · 2022-05-16 12:15

Just did, but apparently the message ("Wrong number of arguments: (0 .
0), 1") indicates no error, just a warning? Because the debugger is
still not entered.

Edit: Restarted Emacs, toggled debug on error, now it works.

Thank you viz!