ss="arrow">&#45;&gt;</span></span> <span><span>(<span><span><a href="#type-value">value</a> option</span> <span class="arrow">&#45;&gt;</span></span> <span><a href="#type-value">value</a> option</span>)</span> <span class="arrow">&#45;&gt;</span></span> <span><a href="#type-t">t</a> <span class="arrow">&#45;&gt;</span></span> <a href="#type-t">t</a></span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-singleton"><a href="#val-singleton" class="anchor"></a><code><span><spa