an>;
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">nb</span>;

<span class="kw">use</span> <span class="ident">hal</span>::<span class="ident">prelude</span>::<span class="kw-2">*</span>;

<span class="kw">enum</span> <span class="ident">Error</span><span class="op">&lt;</span><span class="ident">E</span><span class="op">&gt;</span> {
    <span class="doccomment">/// Serial interface error</span>
    <span class="ident">Serial</span>(<span class="ident">E</span>),
    <spa