variant of the <a href="Scanf.html"><code class="code"><span class="constructor">Scanf</span></code></a> module:
    To preserve scanning semantics, all scanning functions defined in <a href="Scanf.html"><code class="code"><span class="constructor">Scanf</span></code></a>
    must read from a user defined <a href="Scanf.Scanning.html#TYPEin_channel"><code class="code"><span class="constructor">Scanf</span>.<span class="constructor">Scanning</span>.in_channel</code></a> formatted input
    channel.

    If y