websocket-tcp-chat does not open TCP listener

[therealprof]

Not sure it's a bug in the example, in Actix or on my Mac but I cannot get the example to listen on TCP port 12345. session::TcpServer::new is never executed for some reason.

With the following change it works:

-    Arbiter::new().exec(move || {
-        session::TcpServer::new("127.0.0.1:12345", srv);
-        Ok::<_, ()>(())
-    });
+    session::TcpServer::new("127.0.0.1:12345", srv);