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object Conversions {

  implicit def thriftToDatetime(dateTime: ThriftDateTime): JodaDateTime = new JodaDateTime(
    dateTime.year, dateTime.month, dateTime.day,
    dateTime.hour, dateTime.minute, dateTime.second
  )

  implicit def datetimeToThrift(dateTime: JodaDateTime): ThriftDateTime = ThriftDateTime(
    dateTime.getYear().asInstanceOf[Short],
    dateTime.getMonthOfYear().asInstanceOf[Byte],

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import Conversions._

class ConversionsSuite extends FunSuite {

  test("Check implicit conversion from joda to thrift dateTime works") {
    val now = JodaDateTime.now
    val nowInThrift: ThriftDateTime = now
  }
}

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test("Check implicit conversion inside Option from joda to thrift dateTime works") {
    val nowOpt: Option[JodaDateTime] = Some(JodaDateTime.now)
    val nowOptInThrift: Option[ThriftDateTime] = nowOpt
  }

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def convert(jodaOpt: Option[JodaDateTime]): Option[ThriftDateTime] = 
  jodaOpt.map (datetimeToThrift)

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trait Functor[F[_]] {
  /** Lift `f` into `F` and apply to `F[A]`. */
  def map[A, B](fa: F[A])(f: A => B): F[B]
}

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/**
 * Implicit conversions from C[JodaDateTime] -> C[ThriftDateTime]
 * Use import scalaz._ and Scalaz._ to get implicit functors for Option, List etc.
 */
implicit def liftConversionJodaToThrift[C[_]](wrappedJoda: C[JodaDateTime])
  (implicit func: Functor[C]): C[ThriftDateTime] =
    func.map(wrappedJoda)(datetimeToThrift)

/**
 * Implicit conversions from C[ThriftDateTime] -> C[JodaDateTime]

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import org.scalatest.FunSuite
import Conversions._
import scalaz._
import Scalaz._
import company.thrift.{ DateTime => ThriftDateTime }
import org.joda.time.{ DateTime => JodaDateTime }

class ConversionsSuite extends FunSuite {

  test("Check implicit conversion inside Option from joda to thrift dateTime works") {

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  class UserId(id: Int) extends AnyVal
  
  trait UserRegistrationFailures
  case object NicknameAlreadyExists extends UserRegistrationFailures
  case object EmailAlreadyExists extends UserRegistrationFailures
  
  trait UserService {
    def registerUser(nickname: String, email: String, password: String): Future[\/[NonEmptyList[UserRegistrationFailures], UserId]]
  }

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object optionForCompr {
  val opt1 = Some(1)
  val opt2 = Some(2)
  val opt3 = Some(3)

  for {
    r1 <-opt1
    r2 <-opt2
    r3 <-opt3
  } yield r1 + r2 + r3

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val right: \/[String, Int] = \/-(1)
val left: \/[String, Int] = -\/("errorMessage")

// or in another way (let the compiler infer the same types as above)
val right2 = 1.right[String]
val left2 = "errorMessage".left[Int]