class Foo {
  class Marker
  implicit def marker: Marker = new Marker
  def needMarker()(implicit marker: Marker) {}
}

class Bar(foo: Foo)

class Baz extends Bar(new Foo {
  needMarker() // error: could not find implicit value for parameter marker: this.Marker
})
object Baz2 extends Bar(new Foo {
  needMarker() // error: could not find implicit value for parameter marker: this.Marker
})

val bar = new Bar(new Foo {
  needMarker() // however, this code compiles ok
})