Missing bridge for abstract primitive method implemented with polymorphic method.

[nicolasstucki]

Found this issue while executing code on dotty compiled standard library, specifically on calling the method value on a BooleanPropImpl. The following code is a minimized version of the issue:

object Test {
  def main(args: Array[String]): Unit = {
    (new BooleanPropImpl2: BooleanProp2).value
  }
}

class BooleanPropImpl2 extends PropImpl2[Boolean](true) with BooleanProp2

trait BooleanProp2 {
  def value: Boolean
}

class PropImpl2[T](x: T) {
  def value: T = x
}

failing with

java.lang.AbstractMethodError: Method BooleanPropImpl2.value()Z is abstract
	at BooleanPropImpl2.value(main.scala)
	at Test$.main(main.scala:8)

In the bytecode it is clear that class PropImpl2 implements public Object value() and class BooleanProp2 defines boolean value();, but there is no implementation of boolean value() in BooleanPropImpl2.