Extractor returning `NamedTuple` is not considered exhaustive

[eejbyfeldt]

Compiler version

3.7.0, 3.7.1-RC1

Minimized code

object Unpack {
  final case class Pair(a: Int, b: Int)
  def unapply(e: Pair): NamedTuple.NamedTuple[("a", "b"), (Int, Int)] = ???

  val x: Pair = ???
  x match {
    case Unpack(_, _) => ???
  }
}

Output

Produces the following warning

 
-- [E029] Pattern Match Exhaustivity Warning: extractor_namedtuple.scala:6:2 -----------------
6 |  x match {
  |  ^
  |  match may not be exhaustive.
  |
  |  It would fail on pattern case: Unpack()
  |
  | longer explanation available when compiling with `-explain`
1 warning found

Expectation

Should compile without warnings.