span> <span class="ident">isr</span>.<span class="ident">ore</span>().<span class="ident">bit_is_set</span>() {
            <span class="comment">// Error: Buffer overrun</span>
            <span class="prelude-val">Err</span>(<span class="ident">nb</span>::<span class="ident">Error</span>::<span class="ident">Other</span>(<span class="ident">Error</span>::<span class="ident">Overrun</span>))
        }
        <span class="comment">// omitted: checks for other errors</span>
        <span class="kw">else</sp