bug#63236: 29.0.90; loaddefs-generate not 100% backwards compatible

[Eli Zaretskii]

> From: Robert Pluim <rpluim@gmail.com>
> Date: Wed, 03 May 2023 10:40:28 +0200
> 
> >>>>> On Tue, 02 May 2023 19:06:14 +0200, Robert Pluim <rpluim@gmail.com> 
> >>>>> said:
> 
>     Robert> I attempted to upgrade my packages today using `list-packages', 
> which
>     Robert> errored out when regenerating the autoloads for vlf-write.el:
> 
>     Robert> Debugger entered--Lisp error: (search-failed "\n\f\n;;;")
>     Robert>   search-forward("\n\f\n;;;")
>     Robert>   
> loaddefs-generate("/home/rpluim/.emacs.d/elpa/vlf-20191126.2250" 
> "/home/rpluim/.emacs.d/elpa/vlf-20191126.2250/vlf-a..." nil "(add-to-list 
> 'load-path (or (and load-file-name (f...")
>     Robert>   package-generate-autoloads(vlf 
> "/home/rpluim/.emacs.d/elpa/vlf-20191126.2250")
> 
> The minimal patch I can come up with is this, which seems safe enough
> but Iʼd appreciate it if someone who knows the code could comment

Can you describe what was special in your use case, and explain why
the original code didn't work in that case?

Thanks.