Should #22729 (unused member warnings) apply to Selectable as well?

[spavikevik]

We've been using Selectable extensively for fixtures in tests like this:

val f = new Selectable {
  val userId = Some("...")
}

But updating to Scala 3.7.x we are seeing a bunch of unused private member warnings, presumably because of #22729. Is this going to be a permanent limitation from Scala 3.7.x on? And if so, what would be the recommended way to fix the warnings?

Or can this be addressed in a subsequent release?

[spavikevik]

@som-snytt I would appreciate it if you could look into this when you have a chance. Thanks!

[som-snytt]

I "created issue from discussion".

I think I've noticed before that discussions mentioned by tickets are not linked in github:

#23323

[som-snytt]

The current behavior is that it requires the explicit refinement:

//> using options -Wunused:all

import scala.reflect.Selectable

class C:
  val x: Selectable { def f: Int } = new Selectable:
    def f = 42