public void VisitParenthesizedExpression(ParenthesizedExpression parenthesizedExpression)
 {
     writer.Write('(');
     foreach (var child in parenthesizedExpression.Children)
     {
         child.AcceptVisitor(this);
     }
     writer.Write(')');
 }
 public void VisitParenthesizedExpression(ParenthesizedExpression parenthesizedExpression)
 {
     writer.Write ('(');
     foreach (var child in parenthesizedExpression.Children)
         child.AcceptVisitor (this);
     writer.Write (')');
 }