"mdzsyn-coresym">setdyn</span> '<span class="mdzsyn-symbol">a</span> <span class="mdzsyn-constant">nil</span>) <span class="mdzsyn-comment"># -&gt; will remove the binding to 'a in the current environment.</span></code></pre><p>Macros can modify this table to do things that are otherwise not possible in a
macro.
</p>
<pre class="mendoza-codeblock"><code data-language="janet">(<span class="mdzsyn-coresym">defmacro</span> <span class="mdzsyn-symbol">make-defs</span>
  <span class="mdzsyn-string">"Add many def