t might
be needed by semantic actions.  In this case, the code given in the code
string forms the body of a <tt>void</tt> method inside the <tt>parser</tt> 
class.<p>

The final (optional) user code section of the specification indicates how 
the parser should ask for the next token from the scanner.  This has the
form:

</p><pre><tt>    scan with {: ... :};</tt></pre>

As with the <tt>init</tt> clause, the contents of the code string forms
the body of a method in the generated parser.  However, in this cas