ent is the
type of array elements, and the optional second
element is the number of elements in the array. If there is no second element, the type is a 0 element array
which can be used to implement flexible array members as defined in C99.
</p>
<p>(Although a zero-length has a size of zero, it has a required alignment so needs to be included
 in struct definitions.)
</p>
<pre class="mendoza-codeblock"><code data-language="janet">(<span class="mdzsyn-coresym">ffi/size</span> @[<span class="mdzsyn-keyword">: