nst</span> <span class="special">&amp;</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">delete</span><span class="special">;</span>
    <span class="identifier">cleanup_guard</span> <span class="special">&amp;</span> <a class="link" href="formatting_context/cleanup_guard.html#idm32081-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="identifier">cleanup_guard</span> <span class="keyword">const</span>