Ad Hoc Extension of Service Default Implementation

[bpholt]

When using …Gen.Default(…) { … some overrides … } on Scala 3, I get a warning like

[warn]    |Unless class Constant is declared 'open', its extension in a separate file should be enabled
[warn]    |by adding the import clause 'import scala.language.adhocExtensions'
[warn]    |or by setting the compiler option -language:adhocExtensions.
[warn]    |See the Scala docs for value scala.language.adhocExtensions for a discussion
[warn]    |why the feature should be explicitly enabled.

This is what my instance looks like:

new AutoScaling.Default[IO](new NotImplementedError().raiseError) {
  override def completeLifecycleAction(lifecycleHookName: AsciiStringMaxLen255,
                                       autoScalingGroupName: ResourceName,
                                       lifecycleActionResult: LifecycleActionResult,
                                       lifecycleActionToken: Option[LifecycleActionToken],
                                       instanceId: Option[XmlStringMaxLen19]): IO[CompleteLifecycleActionAnswer] =
    deferredCompleteLifecycleActionRequest.complete((lifecycleHookName, autoScalingGroupName, lifecycleActionResult, instanceId))
      .as(CompleteLifecycleActionAnswer())
}

It feels like Default is meant to be partially overridden like this, meaning it should ideally be enabled at the source, either by adding open or abstract to the class definition.