Sure it does. let f = std::fs::File::open("/dev/null").unwrap(); let f: std::os::fd::OwnedFd = f.into(); let socket: std::net::UdpSocket = f.into()

Sure it does. let f = std::fs::File::open("/dev/null").unwrap(); let f: std::os::fd::OwnedFd = f.into(); let socket: std::net::UdpSocket = f.into(); This is really no different. In this example it's not even a socket.