&nbsp;&nbsp;update_config:bool&nbsp;<span class="keywordsign">-&gt;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="constructor">OpamTypes</span>.switch&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="constructor">OpamTypes</span>.compiler&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;unit<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;import&nbsp;:&nbsp;<span class="constructor">OpamTypes