t them have mutable references to them.&amp;quot;</div></div><div class="comment-content">This is the part you lost me, as it is straight out false. A better way to word it is that &quot;the borrow checker doesn&#39;t let them have <b>exclusive</b> references to them&quot;, in which case the mistake should be obvious. You can use Cell/Atomic all you want, and the fact that Redbeard doesn&#39;t point that out either will make Rustaceans think you don&#39;t know what you&#39;re talking about.</div></div><div 