">and</span>&nbsp;directive_argument&nbsp;=&nbsp;{<br>
&nbsp;&nbsp;&nbsp;&nbsp;pdira_desc&nbsp;:&nbsp;<span class="constructor">Parsetree</span>.directive_argument_desc;<br>
&nbsp;&nbsp;&nbsp;&nbsp;pdira_loc&nbsp;:&nbsp;<span class="constructor">Location</span>.t;<br>
&nbsp;&nbsp;}<br>
&nbsp;&nbsp;<span class="keyword">and</span>&nbsp;directive_argument_desc&nbsp;=<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="constructor">Pdir_string</span>&nbsp;<span class="keyword">of</span>&nbsp;string<br>
&nbsp;