n'</span> it
  actually prints the <span class=special>\</span> and <span class=special>n</span> characters,
instead of a newline).</p>
<a name="spirit_debug_print_some"></a>
<h3>BOOST_SPIRIT_DEBUG_PRINT_SOME</h3>
<p> The <tt>BOOST_SPIRIT_DEBUG_PRINT_SOME</tt> constant defines the number of
  characters from the stream to be printed for diagnosis. This defaults to the
  first 20 characters.</p>
<p><a name="spirit_debug_tracenode"></a> </p>
<h3>BOOST_SPIRIT_DEBUG_TRACENODE</h3>
<p> By default all parser node