object Trait {
  class V[T](val i:Int) extends AnyVal
}
trait Trait {
  protected def foo: Trait.V[_]
}

class C extends Trait {
  override protected final def foo: Trait.V[String] = new Trait.V[String](0)
}

D:\Documents\AnyValBridge\AnyValBridge.scala:9: bridge generated for member method foo: ()Trait.V[String] in class C
which overrides method foo: ()Trait.V[_] in trait Trait
clashes with definition of the member itself;
both have erased type ()Int
  override protected final def foo: Trait.V[String] = new Trait.V[String](0)
                               ^