public ExpNode(ExpressionNode leftOperand, ExpressionNode rightOperand) : base(leftOperand, rightOperand)
{
rules["IntType,IntType"] = new IntType();
rules["IntType,BoolType"] = new IntType();
rules["BoolType,IntType"] = new IntType();
}
public static void InitTypes()
{
types["int"] = new IntType();
types["bool"] = new BoolType();
}