How to extract the payload from a rumqtt message callback

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11

I actually have one additional question; I used the following to print the individual elements of "msg":

        let t = &msg.topic.as_str();
        let s = String::from_utf8_lossy(&msg.payload);
        println!("Topic = {}", t);
        println!("Received payload: {}", s);

How can I use t and s outside of the closure?