こうしたい

gistfile1.txt

class A {
  val x = 0
  class B {
    class C {
      def f = x
    }
  }
}

=>

trait TC { self: A#B =>
  class C {
    def f = x // but build error
  }
}

class A {
  val x = 0
  class B extends TC {
  }
}