bsp;<span class="constructor">Ppat_alias</span>&nbsp;<span class="keyword">of</span>&nbsp;<span class="constructor">Parsetree</span>.pattern&nbsp;*&nbsp;string&nbsp;<span class="constructor">Asttypes</span>.loc<br>
&nbsp;&nbsp;&nbsp;&nbsp;<span class="keywordsign">|</span>&nbsp;<span class="constructor">Ppat_constant</span>&nbsp;<span class="keyword">of</span>&nbsp;<span class="constructor">Parsetree</span>.constant<br>
&nbsp;&nbsp;&nbsp;&nbsp;<span class="keywordsign">|</span>&nbsp;<span class="constructor