import scalaz.zio.IO
import scala.io.StdIn

object Example {
  case class MyError(text: String)

  def readOption(availableOptions: Set[String]): IO[InvalidOption, String] =
    IO.effectTotal(StdIn.readLine()).flatMap { input =>
      if (availableOptions.contains(input)) IO.succeed(input)
      else IO.fail(InvalidOption(input, availableOptions))
    }
}