Delegating to the implementation of a calculated super class causes Internal error

[gzm0]

@js.native
trait OuterNativeTrait_Issue4402 extends js.Object {
  @js.native
  class InnerClass extends js.Object {
    def foo(): Unit = js.native
  }
}

object Mytest {
  def createSubclass(superclass: js.Function) = {
    val outer = js.Dynamic.literal(InnerClass = superclass).asInstanceOf[OuterNativeTrait_Issue4402]

    class Subclass extends outer.InnerClass {
      override def foo(): Unit = super.foo()
    }
  }
}

Fails with

scala-js/examples/helloworld/src/main/scala/helloworld/HelloWorld.scala:24:20: Internal error: unable to find the outer accessor symbol of class Subclass
      override def foo(): Unit = super.foo()
                   ^

[gzm0]

Error message originates here: https://github.com/scala/scala/blob/c1ad7230a1157368787f966cc1a84be53a560e3e/src/compiler/scala/tools/nsc/transform/ExplicitOuter.scala#L244

[gzm0]

Suspected upwards trace: https://github.com/scala/scala/blob/c1ad7230a1157368787f966cc1a84be53a560e3e/src/compiler/scala/tools/nsc/transform/ExplicitOuter.scala#L434

[sjrd]

As a workaround, it's probably possible to refer to the parent class prototype to do an old style super call:

override def foo(): Unit =
  superclass.asInstanceOf[js.Dynamic].prototype.foo.call(this)

[ebruchez]

The workaround works, thanks.