l">Err</span>(<span class="ident">nb</span>::<span class="ident">Error</span>::<span class="ident">WouldBlock</span>) <span class="op">=</span><span class="op">&gt;</span> {
                <span class="comment">// no data available yet, check the timer below</span>
            },
            <span class="prelude-val">Ok</span>(<span class="ident">byte</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">byte</sp