nt" class="anchor"></a><code><span class="keyword">val</span> constant : string <span>&#45;&gt;</span> <span><span class="type-var">'a</span> <a href="index.html#type-typ">typ</a></span> <span>&#45;&gt;</span> <span><span class="type-var">'a</span> <a href="index.html#type-const">const</a></span></code></dt><dt class="spec value" id="val-enum"><a href="#val-enum" class="anchor"></a><code><span class="keyword">val</span> enum : string <span>&#45;&gt;</span> <span>?&#8288;typedef:bool</span> <span>&#45;&gt;</