span>;

<span class="kw">fn</span> <span class="ident">flush</span><span class="op">&lt;</span><span class="ident">S</span><span class="op">&gt;</span>(<span class="ident">serial</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">S</span>, <span class="ident">cb</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">CircularBuffer</span>)
<span class="kw">where</span>
    <span class="ident">S</span>: <span class="ident">hal</span>::<sp