;; 在日历中显示假日
(setq! calendar-mark-holidays-flag t)
执行org-schedule出现错误，当关闭显示假日时正常 (setq! calendar-mark-holidays-flag nil)。
debug 错误信息：
Debugger entered--Lisp error: (wrong-type-argument integer-or-marker-p nil)
move-overlay(#<overlay from 225 to 302 in *Calendar*> nil 283)
remove-overlays(283 285)
cal-china-x-remove-exising-overlays(283 285)
apply(cal-china-x-remove-exising-overlays (283 285))
make-overlay(283 285)
calendar-mark-visible-date((3 8 2022) holiday)
#f(compiled-function (&optional event) "Mark notable days in the calendar window.\nIf EVENT is non-nil, it's an event indicating the buffer position to\nuse instead of point." (interactive (list last-nonmenu-event)) #<bytecode 0xa5426feee9b4fa5>)()
apply(#f(compiled-function (&optional event) "Mark notable days in the calendar window.\nIf EVENT is non-nil, it's an event indicating the buffer position to\nuse instead of point." (interactive (list last-nonmenu-event)) #<bytecode 0xa5426feee9b4fa5>) nil)
cal-china-x-mark-holidays(#f(compiled-function (&optional event) "Mark notable days in the calendar window.\nIf EVENT is non-nil, it's an event indicating the buffer position to\nuse instead of point." (interactive (list last-nonmenu-event)) #<bytecode 0xa5426feee9b4fa5>))
apply(cal-china-x-mark-holidays #f(compiled-function (&optional event) "Mark notable days in the calendar window.\nIf EVENT is non-nil, it's an event indicating the buffer position to\nuse instead of point." (interactive (list last-nonmenu-event)) #<bytecode 0xa5426feee9b4fa5>) nil)
calendar-mark-holidays()
calendar-generate-window(2 2022)
calendar-basic-setup(nil)
calendar()
org-read-date(nil to-time nil "SCHEDULED" nil nil)
org-add-planning-info(scheduled nil closed)
#f(compiled-function () #<bytecode -0x1faabae1d8283320>)()
org--deadline-or-schedule(nil scheduled nil)
org-schedule(nil)
funcall-interactively(org-schedule nil)
call-interactively(org-schedule nil nil)
command-execute(org-schedule)
