span class="op">&gt;</span>
<span class="kw">where</span>
    <span class="ident">S</span>: <span class="ident">hal</span>::<span class="ident">spi</span>::<span class="ident">FullDuplex</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>,
{
    <span class="kw">move</span> <span class="op">|</span><span class="op">|</span> {
        <span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">buffer</span>.<span class="ident"