LambdaLift lifts lambdas to private methods, breaking references to them.

[DarkDimius]

This is result of interaction between #342 and #480:

object O {
  val x: Function1[String, String] = a => a
}

after LambdaLift becomes

final module class O$ extends Object { this: <notype> =>
    def <init>(): O$ = {
      super()
      O.x$$local = {
        closure($anonfun$$init$$1)
      }
      ()
    }
    private val x$$local: Function1
    <accessor> def x(): Function1 = O.x$$local
    private def $anonfun$$init$$1(a: String): String = a
  }

The type of $anonfun$$init$$1 in closure is NoPrefix($anonfun$$init$$1), ie doesn't include that this private function should be called on this.
this caused #470.

[DarkDimius]

implemented in #486