;<span class="constructor">Consistbl</span>.t&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;(string&nbsp;*&nbsp;<span class="constructor">Digest</span>.t&nbsp;option)&nbsp;list
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;filter&nbsp;:&nbsp;(string&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;bool)&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="constructor">Consistbl</span>.t&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;unit
&nbsp;&nbsp;<span class="keyword">exception</span>&n