n>::<span class="ident">Error</span><span class="op">&gt;</span>
<span class="kw">where</span>
    <span class="ident">S</span>: <span class="ident">hal</span>::<span class="ident">serial</span>::<span class="ident">Write</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>
{
    <span class="kw">for</span> <span class="kw-2">&amp;</span><span class="ident">byte</span> <span class="kw">in</span> <span class="ident">buffer</span> {
        <span class="macro">block</spa