pan></code></div></div><div class="odoc-spec"><div class="spec type anchored" id="type-expr_desc"><a href="#type-expr_desc" class="anchor"></a><code><span><span class="keyword">and</span> expr_desc</span></code></div><div class="spec-doc"><p>The type of guest-level <em>expressions</em></p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-vars_of_expr"><a href="#val-vars_of_expr" class="anchor"></a><code><span><span class="keyword">val</span> vars_of_expr : <span><a href="#type-expr