anchor.diff:  
   // ----------------------------------------------------------
   mode VineCode;
  -ROUTPUT:    '}}' -> popMode ;
  +ROUTPUT:    '}}' { nestedDictionaryDecl == 0 }? -> popMode ;
   RSTMT:      '>>' -> popMode ;
   
   // Parentheses, square brackets, curly braces
  
positive.code:     //            return base.Emit();
      //    }
      //}
  
      public static bool IsVerbatim(string str)
      {
  
negative.code: RPAREN:     ')' ;
  LBRACK:     '[' ;
  RBRACK:     ']' ;
  LBRACE:     '{' { nestedDictionaryDecl++; } ;
  RBRACE:     '}' { nestedDictionaryDecl--; } ;
  
  // Reserved keywords
  IF:     'if' ;
  