ed" id="val-eval"><a href="#val-eval" class="anchor"></a><code><span><span class="keyword">val</span> eval : <span><a href="#type-env">env</a> <span class="arrow">&#45;&gt;</span></span> <span><a href="#type-t">t</a> <span class="arrow">&#45;&gt;</span></span> <a href="#type-value">value</a></span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-lexer"><a href="#val-lexer" class="anchor"></a><code><span><span class="keyword">val</span> lexer : <span>string <span class="arro