onstructor">Map</span>.<span class="constructor">S</span>.t<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;merge&nbsp;:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;f:(<span class="constructor">MoreLabels</span>.<span class="constructor">Map</span>.<span class="constructor">S</span>.key&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="keywordsign">'</span>a&nbsp;option&nbsp;<span class="keywordsign">-&gt;</spa