 of_foreign_id : int <span>&#45;&gt;</span> <a href="index.html#type-t">t</a></code></dt><dd><p>make a symbol out of any type of variables that can be represented by their <code>int</code> id</p></dd></dl><dl><dt class="spec value" id="val-get_foreign_id_exn"><a href="#val-get_foreign_id_exn" class="anchor"></a><code><span class="keyword">val</span> get_foreign_id_exn : <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> int</code></dt><dd><p>Return the <code>int</code> id of the foreign variable repre