rity" class="anchor"></a><code><span>arity : <span>int option</span>;</span></code></li></ol><code><span>}</span></code><div class="def-doc"><span class="comment-delim">(*</span><p>Hack doesn't support function overloading but it does support functions with default arguments. This means that a procedure is uniquely identified by its name and the number of arguments.</p><span class="comment-delim">*)</span></div></li><li id="type-t.Other" class="def variant constructor anchored"><a href="#type-t.Other" class