rdsign">'</span>a&nbsp;array&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="constructor">Pretty</span>.doc<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;docOpt&nbsp;:&nbsp;(<span class="keywordsign">'</span>a&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="constructor">Pretty</span>.doc)&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;unit&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="keywordsign">'</span>a&nbsp;option&nbsp;<span class="keywordsign">-&gt