Function gtk4_sys::gtk_calendar_get_day_is_marked 
source · pub unsafe extern "C" fn gtk_calendar_get_day_is_marked(
    calendar: *mut GtkCalendar,
    day: c_uint
) -> gbooleanpub unsafe extern "C" fn gtk_calendar_get_day_is_marked(
    calendar: *mut GtkCalendar,
    day: c_uint
) -> gboolean