n class="arrow">&#45;&gt;</span></span> <span class="type-var">'t</span></span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-enum"><a href="#val-enum" class="anchor"></a><code><span><span class="keyword">val</span> enum : <span>string <span class="arrow">&#45;&gt;</span></span> <span><span class="optlabel">?typedef</span>:<span class="type-var">'b</span> <span class="arrow">&#45;&gt;</span></span> <span><span class="optlabel">?unexpected</span>:<span class="type-var">'c<