System/Library/PrivateFrameworks/Message.framework

_TtC22IMAP2ConnectionControlP33_02737B06E3BD0A3D42A98FBBAE158A079EngineBox.h

Download _TtC22IMAP2ConnectionControlP33_02737B06E3BD0A3D42A98FBBAE158A079EngineBox.h

1. _TtCs12_SwiftObject

@interface _TtC22IMAP2ConnectionControlP33_02737B06E3BD0A3D42A98FBBAE158A079EngineBox : _TtCs12_SwiftObject {
    void /* unknown type, empty encoding */ engine;
}

@end