an class="ident">serial</span>::<span class="ident">Write</span><span class="op">&lt;</span><span class="ident">u8</span>, <span class="ident">Error</span> <span class="op">=</span> <span class="ident">Void</span><span class="op">&gt;</span>,
{
    <span class="kw">loop</span> {
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">byte</span>) <span class="op">=</span> <span class="ident">cb</span>.<span class="ident">peek</span>() {
      