argonaut_match.scala

  def apply(input: String): JsonElement = {
    input.decodeOption match {
      case Some(q: Question) => {
        ???
    }
      case Some(r: Respond) => {
        ???
      }
      case Some(b: Batch) => {
        ???
      }
      case _ => println(s"failed to parse")
    }
  }

failures

Error:(14, 11) diverging implicit expansion for type argonaut.DecodeJson[X]
starting with method NonEmptyListDecodeJson in trait DecodeJsons
    input.decodeOption match {
    
Error:(14, 11) not enough arguments for method decodeOption: (implicit evidence$6: argonaut.DecodeJson[X])Option[X].
Unspecified value parameter evidence$6.
    input.decodeOption match {