bj_set_tag"</span><br>
&nbsp;&nbsp;<span class="keyword">external</span>&nbsp;size&nbsp;:&nbsp;<span class="constructor">Obj</span>.t&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;int&nbsp;=&nbsp;<span class="string">"%obj_size"</span><br>
&nbsp;&nbsp;<span class="keyword">external</span>&nbsp;field&nbsp;:&nbsp;<span class="constructor">Obj</span>.t&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;int&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="constructor">Obj</span>.t&nbsp;=&nbsp;<spa