/span>&nbsp;bool&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;unit<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;dump_into_file&nbsp;:&nbsp;bool&nbsp;<span class="constructor">Stdlib</span>.ref<br>
&nbsp;&nbsp;<span class="keyword">type</span>&nbsp;<span class="keywordsign">'</span>a&nbsp;env_reader&nbsp;=&nbsp;{<br>
&nbsp;&nbsp;&nbsp;&nbsp;parse&nbsp;:&nbsp;string&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="keywordsign">'</span>a&nbsp;option;<br>
&nbsp;&nbsp;&nbsp;&nbsp;print&