r>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;isNone&nbsp;:&nbsp;<span class="keywordsign">'</span>a&nbsp;<span class="constructor">Bopt</span>.t&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;bool<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;equal&nbsp;:&nbsp;(<span class="keywordsign">'</span>a&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="keywordsign">'</span>a&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;bool)&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span c