Weird implicts problem in Scala 2.10.1-RC1.

scala2.10.1-RC1broken.scala

import scalaz.Pointed
import scalaz.Scalaz._

trait Doobie[A]

object Doobie {
  implicit def doobiePointed = new Pointed[Doobie] { def point[A](a: => A) = new Doobie[A]() {}; def map[A, B](d: Doobie[A])(f: A => B) = ??? }
}

object Foo {
  type Bar[A] = Doobie[A]
  val foo = 3.point[Bar] // can't find instance of Pointed for Bar
}

This worked in 2.10.0!

fixed in 2.10.1-RC2 https://github.com/scala/scala/pull/2166/files