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我正在尝试创建一个类以添加有理数

class Rational(val numerator: Int, val denominator: Int) {
  require(denominator != 0)

  def this(numerator: Int) = this(numerator, 1)

  def +(addend: Rational): Rational = {
    new EquivalentRationals(this, addend).sum
  }

  def +(addend: Int): Rational =
    new Rational(numerator + (denominator*addend), denominator)

  override def toString = numerator + "/" + denominator
}

class EquivalentRationals(a: Rational, b: Rational) {
  val first: Rational =
    new Rational(a.numerator * b.denominator, a.denominator * b.denominator)

  val second: Rational =
    new Rational(b.numerator * a.denominator, b.denominator * a.denominator)

  def sum(): Rational =
    new Rational(first.numerator + second.numerator, second.denominator)

  def difference(): Rational =
    new Rational(first.numerator - second.numerator, second.denominator)

  override def toString = first + " " + second
}

当我尝试从第一类创建对象时出现以下错误

:23: 错误：类型不匹配；找到：Rational(in object $iw)(in object $iw)(in object $iw)(in object $iw) required: Rational(in object $iw)(in object $iw)(in object $iw)(in object $iw)对象 $iw) new EquivalentRationals(this,addend).sum()

我想知道为什么会发生这种情况，并且我也将感谢任何关于添加有理数的替代方法的建议，这些方法也使用单独的类来表示等效分数。（在“scala 编程”一书中，有一个理性的类已经完成了这一点，而无需使用单独的类） 编辑：问题似乎只在 emacs 中使用 scala-mode 时出现。我尝试通过选择“在解释器中加载文件”选项来运行它，所以虽然它通过命令行运行，但我仍然很好奇为什么它不在“inferior-scala”中

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