[antlr-interest] Confusion about the AST that ANTLRworks 1.3.1 displays during a debugger session

[Bob Anderson]

I'm trying to build an AST that has extraneous tokens removed.  But whether
or not I use a rewrite rule, ANTLRworks always shows me an AST with every
token in it.  Is that normal ANTLRworks behavior, or am I missing some
directive? 
 
Below is a snippet of the grammar...
 
options 
{ 
  language = CSharp2; // CSharp2 targets .Net 2.0  (as opposed to CSharp
which targets .Net 1.1)
  output   = AST;
}
 
prog    : stat+ ;
 
// The following statements produce the same AST display in ANTLRworks... 
 
stat    : 'showInt'  '('  STRING ','  expr ')'  // All tokens expected to be
in the AST
 
stat    : 'showInt'  '('  STRING ','  expr ')'  ->  ^( 'showInt'  STRING
expr )  // Token suppression via rewrite  
 
stat    : 'showInt'  '('! STRING ','! expr ')'! // Another way to suppress
tokens
 
 
Input is:  showInt ( "an int: " , (67 * 98) mod 7 )
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