lass="keyword">type</span>&nbsp;doc<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;nil&nbsp;:&nbsp;<span class="constructor">Pretty</span>.doc<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;(&nbsp;++&nbsp;)&nbsp;:&nbsp;<span class="constructor">Pretty</span>.doc&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="constructor">Pretty</span>.doc&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="constructor">Pretty</span>.doc<br>
&nbsp;&nbsp;<span class="keyword">val</span>&