In example to demonstrate channels use same key in "get" command, that was used in "set" command.

[sateeshkumarb]

Running below client code that has been developed to demonstrate the use of channels results in below output.
(saving the code in file client.rs)

$cargo run --bin client
....
GOT = Ok(Ok(None))
GOT = Ok(Ok(()))

The output is correct but it doesn't clearly demonstrate the intent of the example. This happens because the set is done on the key foo in task t2 (https://github.com/tokio-rs/website/blob/master/tutorial-code/channels/src/main.rs#L70) but where as the key queried in task t1 (https://github.com/tokio-rs/website/blob/master/tutorial-code/channels/src/main.rs#L53) is hello.

Due to indeterminate nature of execution of these lines:

t1.await.unwrap();
t2.await.unwrap();

I understand that the above shown output is not unexpected during the first run of the client. But in cases where the server continues to run, and I run the command cargo run --bin client querying for same key (in the example) would show the output at:

GOT = Ok(Ok(Some(b"bar")))
GOT = Ok(Ok(()))

which I think is appropriate.