Bopt</title>
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<code class="code"><span class="keyword">sig</span><br>
&nbsp;&nbsp;<span class="keyword">type</span>&nbsp;<span class="keywordsign">'</span>a&nbsp;t&nbsp;=&nbsp;<span class="keywordsign">'</span>a&nbsp;option<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;make&nbsp;:&nbsp;<span class="keywordsign">'</span>a&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"