BodyParserModule.scala

trait JsonParser extends BodyParserModule {
  def parse[String, O <: Parser[O]](a: String)(implicit Parser: O): O = a match {
    case Parser(o) => o
    case _ => ???
  }
}


sealed trait Parser[A] {
  def parse(a: String): A
  def unapply(a: String): A
}

object Parser {
  implicit object AbvCalcParser extends Parser[AbvCalc] {
    def parse(a: String): AbvCalc = ???
    def unapply(a: String): Option[AbvCalc] = ???
  }
}

case class AbvCalc(fg: Double, og: Double)