lass="kw">static</span> <span class="ident">SERIAL1</span>: <span class="ident">Mutex</span><span class="op">&lt;</span><span class="ident">Serial1</span><span class="op">&gt;</span> <span class="op">=</span> {
    <span class="comment">// ..</span>
};

<span class="kw">impl</span> <span class="ident">BufferedSerial1</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">write</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">byte</spa