span>&nbsp;<span class="constructor">Parsetree</span>.label_declaration&nbsp;list<br>
&nbsp;&nbsp;<span class="keyword">and</span>&nbsp;type_extension&nbsp;=&nbsp;{<br>
&nbsp;&nbsp;&nbsp;&nbsp;ptyext_path&nbsp;:&nbsp;<span class="constructor">Longident</span>.t&nbsp;<span class="constructor">Asttypes</span>.loc;<br>
&nbsp;&nbsp;&nbsp;&nbsp;ptyext_params&nbsp;:&nbsp;(<span class="constructor">Parsetree</span>.core_type&nbsp;*&nbsp;<span class="constructor">Asttypes</span>.variance)&nbsp;list;<br>
&nbsp;&nbsp