="exception">Illegal_expr</span> <span class="keyword">of</span> <a href="Syntax/index.html#type-expr">Syntax.expr</a></span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-eval_expr"><a href="#val-eval_expr" class="anchor"></a><code><span><span class="keyword">val</span> eval_expr : <span><a href="#type-env">env</a> <span class="arrow">&#45;&gt;</span></span> <span><a href="Syntax/index.html#type-expr">Syntax.expr</a> <span class="arrow">&#45;&gt;</span></span> <a href="V