bel&nbsp;*&nbsp;<span class="constructor">Parsetree</span>.expression&nbsp;option&nbsp;*<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="constructor">Parsetree</span>.pattern&nbsp;*&nbsp;<span class="constructor">Parsetree</span>.class_expr<br>
&nbsp;&nbsp;&nbsp;&nbsp;<span class="keywordsign">|</span>&nbsp;<span class="constructor">Pcl_apply</span>&nbsp;<span class="keyword">of</span>&nbsp;<span class="constructor">Parsetree</span>.class_expr&nbsp;*<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;