span></code></div></div><div class="odoc-spec"><div class="spec value" id="val-free_variables" class="anchored"><a href="#val-free_variables" class="anchor"></a><code><span><span class="keyword">val</span> free_variables : <span><a href="#type-t">t</a> <span class="arrow">&#45;&gt;</span></span> <span><span>( <span class="xref-unresolved">Base</span>.int, <span class="xref-unresolved">Base</span>.Int.comparator_witness )</span> <span class="xref-unresolved">Base</span>.Set.t</span></span></code></div></div>