ss="keywordsign">-&gt;</span>&nbsp;(<span class="keywordsign">'</span>a&nbsp;*&nbsp;<span class="keywordsign">'</span>b)&nbsp;<span class="constructor">Bopt</span>.t<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;any&nbsp;:&nbsp;<span class="keywordsign">'</span>a&nbsp;<span class="constructor">Bopt</span>.t&nbsp;list&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="keywordsign">'</span>a&nbsp;<span class="constructor">Bopt</span>.t<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;e