6;&#x3068;&#x601D;&#x3044;&#x307E;&#x3059;&#x3002;</p>
<pre><code class="lang-elm"><span class="hljs-keyword">type</span> <span class="hljs-keyword">alias</span> <span class="hljs-type">User</span> =
  { name : <span class="hljs-type">String</span>
  , age : <span class="hljs-type">Maybe</span> <span class="hljs-type">Int</span>
  }
</code></pre>
<!--
Now say Sue creates an account, but decides not to provide her birthday:
-->
<p>&#x30B9;&#x30FC;&#xFF08;Sue&#xFF09;&#x304C;&#x30A2;&#x30AB;&#x30A6;&#x30F3;&#x