">-&gt;</span>&nbsp;int64&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;int64&nbsp;=&nbsp;<span class="string">"%int64_add"</span><br>
&nbsp;&nbsp;<span class="keyword">external</span>&nbsp;sub&nbsp;:&nbsp;int64&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;int64&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;int64&nbsp;=&nbsp;<span class="string">"%int64_sub"</span><br>
&nbsp;&nbsp;<span class="keyword">external</span>&nbsp;mul&nbsp;:&nbsp;int64&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;int6