$asInstanceOf$ does not take parameters in structural call

[bishabosha]

Minimized code

class Bag extends reflect.Selectable

@main def Test =
  val x = new Bag:
    val f1 = 23

  println(x.f1())

Output

-- [E050] Type Error: example.scala:7:10 ---------------------------------------
7 |  println(x.f1())
  |          ^^^^
  |          method $asInstanceOf$ in class Any does not take parameters

Expectation

value f1 does not take parameters