_desc;<br>
&nbsp;&nbsp;&nbsp;&nbsp;psig_loc&nbsp;:&nbsp;<span class="constructor">Location</span>.t;<br>
&nbsp;&nbsp;}<br>
&nbsp;&nbsp;<span class="keyword">and</span>&nbsp;signature_item_desc&nbsp;=<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="constructor">Psig_value</span>&nbsp;<span class="keyword">of</span>&nbsp;<span class="constructor">Parsetree</span>.value_description<br>
&nbsp;&nbsp;&nbsp;&nbsp;<span class="keywordsign">|</span>&nbsp;<span class="constructor">Psig_type</span>&nbsp;<span cla