pan> = </span></code><ol><li id="type-exception_.Atom" class="def variant constructor anchored"><a href="#type-exception_.Atom" class="anchor"></a><code><span>| </span><span><span class="constructor">Atom</span> <span class="keyword">of</span> string</span></code></li><li id="type-exception_.Pattern" class="def variant constructor anchored"><a href="#type-exception_.Pattern" class="anchor"></a><code><span>| </span><span><span class="constructor">Pattern</span> <span class="keyword">of</span> string</span></