@interface _TtCC7Message25InProgressMessageDownload26AttachmentDecoderAndWriter : _TtCs12_SwiftObject {
void /* unknown type, empty encoding */ decoder;
void /* unknown type, empty encoding */ fileWriter;
void /* unknown type, empty encoding */ didClose;
void /* unknown type, empty encoding */ totalByteCount;
void /* unknown type, empty encoding */ appendedByteCount;
}
@end