a href="#val-join" class="anchor"></a><code><span class="keyword">val</span> join : <a href="index.html#type-t">t</a> <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-widen"><a href="#val-widen" class="anchor"></a><code><span class="keyword">val</span> widen : <span>prev:<a href="index.html#type-t">t</a></span> <span>&#45;&gt;</span> <span>next:<a href="index.html#type-t">t</a></span> <span>&#45;&gt;</