bug#46883: 28.0.50; calendar-holidays var setup errors

[Stephen Berman]

On Fri, 05 Mar 2021 14:34:15 +0100 Lars Ingebrigtsen <larsi@gnus.org> wrote:

> adam@faryna.io writes:
>
>> I did but nothing new shows up.
>>
>> Also while Emacs is running it brings to the front the *Warning*
>> buffer with this calendar errors, as it probably continue try to
>> initialize it.
>
> Very odd.  Does anybody else have any suggestions for debugging this?

You can put this in your init file:

(setq calendar-debug-sexp t)

I made an init file consisting of the sexps in the OP (except for the
ones involving japanese-holidays, since I don't have that package),
added the above for debugging, started Emacs, did `M-x calendar', typed
`h' on a date in the Calendar buffer, and got this backtrace:

txt6Db2Bf6Iw1.txt
Description: calendar-debug-sexp backtrace

The problem seems to be this sexp from the OP's post:

(setq
 holiday-local-holidays nil
 calendar-christian-all-holidays-flag t
 calendar-holidays (list
                    japanese-holidays
                    polish-holidays
                    english-holidays
                    ;; holiday-local-holidays
                    general-holidays
                    holiday-christian-holidays
                    holiday-solar-holidays)
 ;; calendar-mark-holidays-flag t
 calendar-week-start-day 1
 calendar-date-style 'european)

Using `list' results in an unsuitable list structure.  I replaced it by
`append' (again omitting japanese-holidays), restarted Emacs, did `M-x
calendar', typed `h' on March 10 in the Calendar buffer, and the echo
area displayed this message:

Wednesday, 10 March 2021:  Dzień Mężczyzn

So I guess that should fix the OP's problem.

Steve