ss="keyword">of</span>&nbsp;<span class="constructor">UnixLabels</span>.error&nbsp;*&nbsp;string&nbsp;*&nbsp;string<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;error_message&nbsp;:&nbsp;<span class="constructor">UnixLabels</span>.error&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;string<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;handle_unix_error&nbsp;:&nbsp;(<span class="keywordsign">'</span>a&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="keywordsign">'</span>b)&nbs