use std::cell::Cell;use std::comm::SharedChan;fnload_image(url: ~str) -> ~[u8]{    ~[0,1,2]}// Object://fn load_image(url: ~str) -> ~[u8];enumImageLoaderMsg{LoadImage(~str,Chan<~[u8]>),Exit}fnmain(){let urlto_load = ~"foo.png";let(port, chan) =stream::<ImageLoaderMsg>();    do spawn{        loop{            match port.recv(){LoadImage(url, result_chan) =>{let image =load_image(url);                    result_chan.send(image);}Exit =>break}}}// make a load image requestlet shared_chan =SharedChan::new(chan);for _inrange(0,10){let new_chan = shared_chan.clone();do spawn{            let(result_port, result_chan) =stream();            new_chan.send(LoadImage(~"image.png", result_chan));let image = result_port.recv();println!("{:?}", image);}}    shared_chan.send(Exit);}