n">-&gt;</span>&nbsp;unit<br>
&nbsp;&nbsp;<span class="keyword">type</span>&nbsp;access_permission&nbsp;=&nbsp;<span class="constructor">Unix</span>.access_permission&nbsp;=&nbsp;<span class="constructor">R_OK</span>&nbsp;<span class="keywordsign">|</span>&nbsp;<span class="constructor">W_OK</span>&nbsp;<span class="keywordsign">|</span>&nbsp;<span class="constructor">X_OK</span>&nbsp;<span class="keywordsign">|</span>&nbsp;<span class="constructor">F_OK</span><br>
&nbsp;&nbsp;<span class="keyword">val</spa