val-mk_empty"><a href="#val-mk_empty" class="anchor"></a><code><span class="keyword">val</span> mk_empty : unit <span>&#45;&gt;</span> <a href="index.html#type-t">t</a></code></dt><dd><p>create an empty predicate environment</p></dd></dl><dl><dt class="spec value" id="val-is_empty"><a href="#val-is_empty" class="anchor"></a><code><span class="keyword">val</span> is_empty : <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> bool</code></dt><dd><p>return true if the environment is empty</p></dd></dl><dl