l v env</code> should return the environment obtained by adding the binding <code>(l,v)</code> to <code>env</code>. If <code>l</code> is already bound in <code>env</code>, the associated value is updated.</p></div></div><h4 id="evaluators"><a href="#evaluators" class="anchor"></a>Evaluators</h4><div class="odoc-spec"><div class="spec exception anchored" id="exception-Illegal_expr"><a href="#exception-Illegal_expr" class="anchor"></a><code><span><span class="keyword">exception</span> </span><span><span class