de <code class="mendoza-code">:pack-all</code>
somewhere in the struct definition.
</p>
<pre class="mendoza-codeblock"><code data-language="janet">(<span class="mdzsyn-coresym">ffi/size</span> (<span class="mdzsyn-coresym">ffi/struct</span> <span class="mdzsyn-keyword">:char</span> <span class="mdzsyn-keyword">:int</span>)) <span class="mdzsyn-comment"># -&gt; 8</span>
(<span class="mdzsyn-coresym">ffi/size</span> (<span class="mdzsyn-coresym">ffi/struct</span> <span class="mdzsyn-keyword">:char</span> <spa