 an &amp;amp;mut member</div></div><div class="comment-content">The &quot;Can&#39;t do RAII&quot; section seems based on the assumption shared mutability is the only way to access/change things, though this is also possible and commonly done through RefCell/Mutex. Do we consider these to be shared mutability since they let multiple things change another, just not at the same time?<br>If we don&#39;t consider them shared mutability - RAII then doesn&#39;t require shared mutability since it can be done throug