public virtual T Visit(UndefinedExpression expression) { return(default(T)); }
public virtual Expression Visit(UndefinedExpression expression) { return(expression); }
public void VisitUndefinedExpression(UndefinedExpression undefinedExpression) { ReturnValue = null; }
public int Visit(UndefinedExpression expression) { _writer.Write("undefined"); return(0); }