public void Visit(NullLiteral literal)
 {
     _codeStack.Peek().Tag = "null";
     _codeStack.Peek().CodeExpression = new CodePrimitiveExpression(null);
 }
 public void Visit(NullLiteral literal, CommonTree tree)
 {
     Parent(tree).Children.Add(literal);
     SetLine(literal, tree);
 }