Re: Error does not throw to debugger in 'when' block

[Eli Zaretskii <eliz@gnu.org>]

> From: Arthur Miller <arthur.miller@live.com>
> Date: Thu, 12 Jan 2023 07:51:01 +0100
> 
> When running this little code, I have observed that 'error' does not end in
> debugger:
> 
> (defun new-patch (&optional patch-name)
>   (interactive "sPatch name: ")
>   (let ((path (expand-file-name patch-name)))
>     (message "PATH: %s" path)
>     (when (file-exists-p path)
>       (error "A worktree with this name already exists"))))
> 
> If I run this code, I see it correctly executes error, but it does not open
> debugger. If I place cursor after the error form, debugger is
> opened. Value of debug-on-error is 't.
> 
> This is output in *Messages* buffer for 'Emacs -Q':
> 
> PATH: /home/arthur/repos/emsrc/28.2
> progn: A worktree with this name already exists
> Mark set [2 times]
> 
> Just curious, is this intended new behaviour for 'error' or a bug?

How exactly do you "run this code"?  The details matter.