@interface Message.InProgressMessageDownload : _TtCs12_SwiftObject {
    void /* unknown type, empty encoding */ uid;
    void /* unknown type, empty encoding */ bodyStructure;
    void /* unknown type, empty encoding */ existingData;
    void /* unknown type, empty encoding */ downloadedHeader;
    void /* unknown type, empty encoding */ sections;
    void /* unknown type, empty encoding */ passAndActionID;
    void /* unknown type, empty encoding */ cleanedUpFullMessageData;
    void /* unknown type, empty encoding */ _cachedAttachmentFilenames;
}

@end