iv class="para _3">
     <p>
      Except for the freely customizable <code class="fsharp"><span class="ci">UserState</span></code>, all the mutable state information in the <code
      class="fsharp"><a href="../reference/charstream.html#CharStream"><span class="ci">CharStream</span></a><span class="cp">&lt;</span><span
      class="ctv">'u</span><span class="cp">&gt;</span></code> instance pertains to the location of the next char in the text stream. The most
      important element of the state is the ch