gt;</span> <a href="index.html#type-value">value</a> <span>&#45;&gt;</span> <a href="index.html#type-value">value</a>)</span> <span>&#45;&gt;</span> <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> <a href="index.html#type-t">t</a></code></dt><dt class="spec value" id="val-is_singleton_or_more"><a href="#val-is_singleton_or_more" class="anchor"></a><code><span class="keyword">val</span> is_singleton_or_more : <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> <span><span>(<a href="index.html#t