let</span> <span class='ident'>j</span> <span class='op'>=</span> <span class='ident'>rx</span>.<span class='ident'>recv</span>().<span class='ident'>unwrap</span>();
    <span class='macro'>assert</span><span class='macro'>!</span>(<span class='number'>0</span> <span class='op'>&lt;=</span> <span class='ident'>j</span> <span class='op'>&amp;&amp;</span> <span class='ident'>j</span> <span class='op'>&lt;</span> <span class='number'>10</span>);
}</pre>

<p>Propagating panics:</p>
<span class='rusttest'>fn ma