bsp;string&nbsp;<span class="constructor">Asttypes</span>.loc;<br>
&nbsp;&nbsp;&nbsp;&nbsp;pbop_pat&nbsp;:&nbsp;<span class="constructor">Parsetree</span>.pattern;<br>
&nbsp;&nbsp;&nbsp;&nbsp;pbop_exp&nbsp;:&nbsp;<span class="constructor">Parsetree</span>.expression;<br>
&nbsp;&nbsp;&nbsp;&nbsp;pbop_loc&nbsp;:&nbsp;<span class="constructor">Location</span>.t;<br>
&nbsp;&nbsp;}<br>
&nbsp;&nbsp;<span class="keyword">and</span>&nbsp;value_description&nbsp;=&nbsp;{<br>
&nbsp;&nbsp;&nbsp;&nbsp;pval_name&nbsp;:&n