 object</span>
(<span class="mdzsyn-coresym">let</span> [<span class="mdzsyn-symbol">x</span> @{<span class="mdzsyn-keyword">:a</span> <span class="mdzsyn-number">1</span>}]
  (<span class="mdzsyn-coresym">assert</span> (<span class="mdzsyn-coresym">=</span> <span class="mdzsyn-symbol">x</span> <span class="mdzsyn-symbol">x</span>)))

<span class="mdzsyn-comment"># NOTE: = works as expected on immutable structures</span>
(<span class="mdzsyn-coresym">assert</span> (<span class="mdzsyn-coresym">=</span> [<sp