yword">val</span>&nbsp;stdin&nbsp;:&nbsp;<span class="constructor">Pervasives</span>.in_channel<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;stdout&nbsp;:&nbsp;<span class="constructor">Pervasives</span>.out_channel<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;stderr&nbsp;:&nbsp;<span class="constructor">Pervasives</span>.out_channel<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;print_char&nbsp;:&nbsp;char&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;unit<br>
&nbsp;&nbsp;<span 