@interface Foundation._Calendar : _TtCs12_SwiftObject {
    void /* unknown type, empty encoding */ lock;
    void /* unknown type, empty encoding */ identifier;
    void /* unknown type, empty encoding */ ucalendar;
    void /* unknown type, empty encoding */ _timeZone;
    void /* unknown type, empty encoding */ customFirstWeekday;
    void /* unknown type, empty encoding */ customMinimumFirstDaysInWeek;
    void /* unknown type, empty encoding */ localeIdentifier;
    void /* unknown type, empty encoding */ localePrefs;
    void /* unknown type, empty encoding */ customGregorianStartDate;
}

@end