an class="keyword">val</span> (/@) : <span>(<a href="index.html#type-bound">bound</a> * <a href="index.html#type-bound">bound</a>)</span> <span>&#45;&gt;</span> <span>(<a href="index.html#type-bound">bound</a> * <a href="index.html#type-bound">bound</a>)</span> <span>&#45;&gt;</span> <span><span>(<a href="index.html#type-bound">bound</a> * <a href="index.html#type-bound">bound</a>)</span> option</span></code></dt><dt class="spec value" id="val-ln10"><a href="#val-ln10" class="anchor"></a><code><span class="