bug#60987: 30.0.50; Calendar not accepting custom holidays

[Eli Zaretskii]

> Date: Sat, 21 Jan 2023 15:00:09 +0100
> From: "Emanuele M. Monterosso" <emanuele.monterosso@gmail.com>
> 
> I've found the current issue with my build of emacs:
> I set the variables holiday-general-holidays and
> holiday-christian-holidays using the Localized snippets found
> in the Emacswiki page, they appear if I do:
>  
> M-x holiday-list RET RET RET General/Christian
>  
> But they don't appear at all on the calendar and if I choose
> All from holiday-list menu they also do not appear. Am I doing something
> wrong?

Please show step by step instructions to reproduce the issue starting
from "emacs -Q".  It is hard to look into an issue without such a
recipe, as the details are usually important.

Thanks.