public AddNode(IArithmeticNode left, IArithmeticNode right) : base(left, right, "+") { }
public AssignmentNode(string name, IArithmeticNode body) { Name = name; Body = body; }
protected OperatorNode(IArithmeticNode left, IArithmeticNode right, string symbol) { Left = left; Right = right; Symbol = symbol; }