n class="keyword">of</span>&nbsp;<span class="constructor">Parsetree</span>.class_type_declaration&nbsp;list<br>
&nbsp;&nbsp;&nbsp;&nbsp;<span class="keywordsign">|</span>&nbsp;<span class="constructor">Psig_attribute</span>&nbsp;<span class="keyword">of</span>&nbsp;<span class="constructor">Parsetree</span>.attribute<br>
&nbsp;&nbsp;&nbsp;&nbsp;<span class="keywordsign">|</span>&nbsp;<span class="constructor">Psig_extension</span>&nbsp;<span class="keyword">of</span>&nbsp;<span class="constructor">Parsetre