ass="keywordsign">-&gt;</span>&nbsp;<span class="constructor">Dir</span>.t&nbsp;list<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;in_dir&nbsp;:&nbsp;<span class="constructor">Dir</span>.t&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;(unit&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="keywordsign">'</span>a)&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="keywordsign">'</span>a<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;exec&nbsp;:<br>
&nbsp;&nbsp;&nbsp;&