Claim Monad for X509 Certificates - having trouble running map on it

RequestHeader.scala

import java.net.URI
import scalaz.concurrent.Promise
import scalaz._
import Scalaz._
import language.implicitConversions
import language.higherKinds

case class Cert(cn: String, pubKey: BigInt, webids: List[URI] )

trait RequestHeader {
  type Certificates = Cert

  def cert: Promise[Claim[_,Certificates]]

}

trait Level
object Truth extends Level
object PubKeyVerified extends Level


trait Claim[L <: Level, S] {
  protected val statements: S

  val level: L

  // you might want a dedicated type for this verification functions
  // apart from the simple `Function1`... because then your intent will
  // become clear and you don't get any 'undesired' implicit values
  def verify[L2 <: Level, S2](implicit verify: Verificator[L, S, L2, S2]): Claim[L2, S2] =   {
    verify(this)
  }
}

trait Verificator[L<: Level,S,L2<:Level,S2] {
  def apply(s: Claim[L,S]): Claim[L2,S2]
}


trait TrueClaim[S] extends Claim[Truth.type,S] {
  def st: S = statements
}

object Claim {

  implicit val level: Level =  Truth


  implicit def truth[S](s: Claim[Truth.type,S]) =  s.flatMap(s => new TrueClaim[S] {
      protected val statements = s
      val level = Truth
    }
  )


  implicit def ClaimMonad[L <: Level](implicit lvl: L): Monad[({type f[+a] = Claim[L, a]})#f] =
   new Monad[({type f[+a] = Claim[L, a]})#f]  {

      def point[A](a: => A) = new Claim[L,A] {
        protected val statements : A = a

        val level: L = lvl

      }

      def bind[A, B](fa: Claim[L,A])(f: A => Claim[L,B]) = f(fa.statements)
    }

  implicit def truthClaimMonad = ClaimMonad(Truth)
//  implicit def pubKeyVerifiedClaimMonad = ClaimMonad(PubKeyVerified)

   implicit def unapplyClaim[TC[_[_]], A0 <: Level, B0](implicit TC0: TC[({type λ[α] = Claim[A0, α]})#λ]): Unapply[TC, Claim[A0, B0]] {
    type M[X] = Claim[A0, X]
    type A = B0
  } = new Unapply[TC, Claim[A0, B0]] {
    type M[X] = Claim[A0, X]
    type A = B0
    def TC = TC0
    def apply(ma: Claim[A0, B0]) = ma
  }

}

ok. After adding that unnapplyClaim and uncommenting the implicit def truth... in the code I get

scala> ClaimMonad.point(Cert("Henry Story",BigInt(123456789),List(new java.net.URI("http://bblfish.net/#hjs"))))
<console>:14: error: not found: value ClaimMonad
              ClaimMonad.point(Cert("Henry Story",BigInt(123456789),List(new java.net.URI("http://bblfish.net/#hjs"))))
              ^

scala> import Claim._
import Claim._

scala> ClaimMonad.point(Cert("Henry Story",BigInt(123456789),List(new java.net.URI("http://bblfish.net/#hjs"))))
<console>:17: error: diverging implicit expansion for type L
starting with method unapplyClaim in object Claim
              ClaimMonad.point(Cert("Henry Story",BigInt(123456789),List(new java.net.URI("http://bblfish.net/#hjs"))))
              ^

scala> ClaimMonad(Truth).point(Cert("Henry Story",BigInt(123456789),List(new java.net.URI("http://bblfish.net/#hjs"))))
res2: Claim[Truth.type,Cert] = Claim$$anon$1$$anon$3@66706ec

scala> res2.map( s => s.cn )
res3: scalaz.Unapply[scalaz.Functor,Claim[Truth.type,Cert]]{type M[X] = Claim[Truth.type,X]; type A = Cert}#M[String] = Claim$$anon$1$$anon$3@5c480fa4

scala> res3.st
<console>:19: error: value st is not a member of scalaz.Unapply[scalaz.Functor,Claim[Truth.type,Cert]]{type M[X] = Claim[Truth.type,X]; type A = Cert}#M[String]
              res3.st