public AssignExpressionAST(LHSExpressionAST leftExp, ExpressionAst rightExp, int line, int col)
     : base(line, col)
 {
     LeftExpression  = leftExp;
     RightExpression = rightExp;
     ReturnType      = TigerType.GetType <NoType>();
 }
 public AssignExpressionAST(LHSExpressionAST leftExp, ExpressionAst rightExp)
 {
     LeftExpression  = leftExp;
     RightExpression = rightExp;
     ReturnType      = TigerType.GetType <NoType>();
 }