d></tr>
<tr><td valign=top ><tt>call-with-input-file</tt> </td><td valign=top ><tt>(rnrs io simple (6))</tt> </td></tr>
<tr><td valign=top ><tt>call-with-output-file</tt> </td><td valign=top ><tt>(rnrs io simple (6))</tt> </td></tr>
<tr><td valign=top ><tt>char-upcase</tt> </td><td valign=top ><tt>(rnrs unicode (6))</tt> </td></tr>
<tr><td valign=top ><tt>char-downcase</tt> </td><td valign=top ><tt>(rnrs unicode (6))</tt> </td></tr>
<tr><td valign=top ><tt>char-ci=?</tt> </td><td valign=top ><tt>(rnrs unico