implicit的使用场景有哪些？

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• 1.隐式参数：

    def handleEarnOpportunityInfo(earnOpportunityInfoCommand: FetchEarnOpportunityInfoCommand)(implicit lang: Language)

• 2.隐式值

    implicit val overviewOpportunityInfoTransformer: Transformer[EarnOverviewOpportunityInfo, Displayable] =
        Transformable[EarnOverviewOpportunityInfo, Displayable].instance

• 3.隐式转换

    @inline implicit def intWrapper(x: Int)         = new runtime.RichInt(x)

• 4.拓展方法（Scala2）

    implicit final class BigDecimalStringOps(val decimalStr: String) extends AnyVal {
        def toBigDecimalOpt: Option[BigDecimal] = Try(Option(BigDecimal(decimalStr))).getOrElse(None)
        def toBigDecimal: BigDecimal = toBigDecimalOpt.getOrElse(BigDecimal(0))
    }

• 5.隐式嵌套（也属于隐式转换）

    implicit final def transformerOption[F, T](implicit e: Transformer[F, T]): Transformer[Option[F], Option[T]] =
        new Transformer[Option[F], Option[T]] {
            override def transform(from: Option[F]): Option[T] = from.map(e.transform)
    }

答到1.2.3.4及格

答全，满分