@interface _TtCCC7Message25InProgressMessageDownload26AttachmentDecoderAndWriter7Decoder : _TtCs12_SwiftObject {
void /* unknown type, empty encoding */ mediaType;
void /* unknown type, empty encoding */ encoding;
void /* unknown type, empty encoding */ filter;
void /* unknown type, empty encoding */ decoded;
void /* unknown type, empty encoding */ decodedSmall;
void /* unknown type, empty encoding */ filterIsDone;
}
@end