resym">setdyn</span> '<span class="mdzsyn-coresym">pp</span> <span class="mdzsyn-constant">nil</span>) <span class="mdzsyn-comment"># -&gt; will not work, as 'pp is defined in the current environments prototype table.</span>
(<span class="mdzsyn-coresym">setdyn</span> '<span class="mdzsyn-coresym">pp</span> @{}) <span class="mdzsyn-comment"># -&gt; will define 'pp as nil.</span>
(<span class="mdzsyn-coresym">def</span> <span class="mdzsyn-symbol">a</span> <span class="mdzsyn-number">10</span>)
(<span class=