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Re: improving debug output of get-buffer
From: |
Rahguzar |
Subject: |
Re: improving debug output of get-buffer |
Date: |
Thu, 02 Nov 2023 16:11:48 +0100 |
User-agent: |
mu4e 1.10.7; emacs 29.1 |
Hi Eli,
I was the other participant in the original discussion that led to this
thread.
Eli Zaretskii <eliz@gnu.org> writes:
>> That makes sense. But basically, we were using with-current-buffer, which
>> uses
>> set-buffer and it took time to realize the “(wrong-type-argument stringp
>> nil)”
>> error was from that with-current-buffer.
>
> And the backtrace didn't tell you the error was from set-buffer?
No backtrace stopped before `set-buffer`.
The backtrace was
Debugger entered--Lisp error: (wrong-type-argument stringp nil)
eshell-syntax-highlighting--highlight-elisp(113 120)
eshell-syntax-highlighting--parse-and-highlight(command 120)
#<subr eshell-syntax-highlighting--enable-highlighting>()
apply(#<subr eshell-syntax-highlighting--enable-highlighting> nil)
(condition-case err (apply func args) ((debug error) (signal (car err) (cdr
err))))
cae-debug-reraise-error(#<subr
eshell-syntax-highlighting--enable-highlighting>)
apply(cae-debug-reraise-error #<subr
eshell-syntax-highlighting--enable-highlighting> nil)
eshell-syntax-highlighting--enable-highlighting()
where the function `eshell-syntax-highlighting--highlight-elisp` uses
the `with-current-buffer`.
I have been flummoxed by similar problems a few times before. Usually it
is `(with-current-buffer var body)` where `var` is a variable whose value
is I expect to be a buffer but which actually in nil. The
`(wrong-type-argument stringp nil)` makes me go looking for nil strings
in the body rather than realizing that the problem is with var
especially since `set-buffer` tends not to popup in the backtrace.
> In any case, your original question was about get-buffer, not about
> set-buffer. Are you actually asking about set-buffer?
`set-buffer` is more relevant yes.
Thanks,
Rahguzar