lass="constructor">Parsetree</span>.row_field&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;unit;<br>
&nbsp;&nbsp;&nbsp;&nbsp;object_field&nbsp;:&nbsp;<span class="constructor">Ast_iterator</span>.iterator&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="constructor">Parsetree</span>.object_field&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;unit;<br>
&nbsp;&nbsp;&nbsp;&nbsp;type_declaration&nbsp;:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="constructor">Ast_iterator</span>.itera