GNU bug report logs - #77744
31.0.50; Inconsistent error signal in up-list-default-function and treesit-up-list

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Message #14 received at 77744 <at> debbugs.gnu.org (full text, mbox):

From: Roman Rudakov <rrudakov <at> fastmail.com>
To: Juri Linkov <juri <at> linkov.net>
Cc: Stefan Monnier <monnier <at> iro.umontreal.ca>, 77744 <at> debbugs.gnu.org
Subject: Re: bug#77744: 31.0.50; Inconsistent error signal in
 up-list-default-function and treesit-up-list
Date: Fri, 11 Apr 2025 18:30:30 +0200

Juri Linkov <juri <at> linkov.net> writes:

>> In Tree-sitter-based major modes, when up-list (or 
>> backward-up-list) is
>> used, the operation is delegated to the treesit-up-list 
>> function. In
>> traditional major modes, this is typically handled by
>> up-list-default-function if a custom up-list-function is not 
>> defined. When
>> the top level is reached, up-list-default-function signals 
>> scan-error, but
>> treesit-up-list signals user-error.
>
> This is because 'up-list-default-function' signals both:
>
>   (if no-syntax-crossing
>       ;; Assume called interactively; don't signal an error.
>       (user-error "At top level")
>     (signal (car err) (cdr err)))
Yes, I forgot to mention it in the initial report. 'scan-error' is 
signaled by 'up-list-default-function' when it's called 
non-interactively, but 'treesit-up-list' signals 'user-error' in this 
case.
--
Best regards, Roman

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