a><code><span>arity : <span>int option</span>;</span></code></li></ol><code><span>}</span></code></div></div><div class="odoc-spec"><div class="spec type anchored" id="type-kind"><a href="#type-kind" class="anchor"></a><code><span><span class="keyword">type</span> kind</span><span> = </span></code><ol><li id="type-kind.Fun" class="def variant constructor anchored"><a href="#type-kind.Fun" class="anchor"></a><code><span>| </span><span><span class="constructor">Fun</span> <span class="keyword">of</span> <a hr