 empty element</p></dd></dl><section><header><h2 id="variables-management"><a href="#variables-management" class="anchor"></a>Variables management</h2></header><dl><dt class="spec value" id="val-add_var"><a href="#val-add_var" class="anchor"></a><code><span class="keyword">val</span> add_var : <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> <a href="../../../Csp/index.html#type-decl">Csp.decl</a> <span>&#45;&gt;</span> <a href="index.html#type-t">t</a></code></dt><dd><p>adds an unconstrained variab