val</span> (+) : <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><dd><p><a href="index.html#val-add"><code>add</code></a></p></dd></dl><dl><dt class="spec value" id="val-(-)"><a href="#val-(-)" class="anchor"></a><code><span class="keyword">val</span> (-) : <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