ywordsign">-&gt;</span>
&nbsp;&nbsp;&nbsp;&nbsp;<span class="constructor">Arg</span>.anon_fun&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;string&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;unit
&nbsp;&nbsp;<span class="keyword">exception</span>&nbsp;<span class="constructor">Help</span>&nbsp;<span class="keyword">of</span>&nbsp;string
&nbsp;&nbsp;<span class="keyword">exception</span>&nbsp;<span class="constructor">Bad</span>&nbsp;<span class="keyword">of</span>&nbsp;string
&nbsp;&nbsp;<span class