private protected override void VisitGoToStatement(BoundGoToStatement node)
 {
     if (!this.labels.Contains(node.Label))
     {
         this.diagnostics.ReportGoToUndefinedLabel(node.Syntax.LabelToken.Range, node.Label);
     }
 }
 private protected virtual void VisitGoToStatement(BoundGoToStatement node)
 {
     this.DefaultVisit(node);
 }