      <span class="kw">match</span> <span class="ident">serial</span>.<span class="ident">write</span>(<span class="kw-2">*</span><span class="ident">byte</span>) {
                <span class="prelude-val">Err</span>(<span class="ident">nb</span>::<span class="ident">Error</span>::<span class="ident">Other</span>(<span class="kw">_</span>)) <span class="op">=</span><span class="op">&gt;</span> <span class="macro">unreachable</span><span class="macro">!</span>(),
                <span class="prelude-val">Er