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import spray.json._
trait CustomFormats extends DefaultJsonProtocol {
implicit val fooFormat: JsonFormat[Foo] = new JsonFormat[Foo] {
def read(number: JsValue) = number match {
case JsNumber(x) => Foo(-x.toInt)
case tpe => sys.error(s"no way I'm reading that type $tpe!")
}
def write(number: Foo) = JsNumber(-number.x)
}
implicit val z: JsonFormat[B] = new JsonFormat[B] {
def read(x: JsValue) = B("gone")
def write(x: B) = JsObject("a" -> JsString("A"))
}
}
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