unchecked warnings in REPL of recent 2.13.x build

[Jasper-M]

Welcome to Scala 2.13.2-bin-f86e6b (Java HotSpot(TM) 64-Bit Server VM, Java 1.8._152).
Type in expressions for evaluation. Or try :help.

scala> :pa
// Entering paste mode (ctrl-D to finish)

sealed abstract class Value
object Value {
    final case class Num(value: Double) extends Value
    final case class Str(value: String) extends Value
    final case class Bool(value: Boolean) extends Value
}

// Exiting paste mode, now interpreting.

warning: 3 unchecked warnings; for details, enable `:setting -unchecked' or `:replay -unchecked'
class Value
object Value

scala> :warn
           final case class Num(value: Double) extends Value
                            ^
On line 3: warning: The outer reference in this type test cannot be checked at run time.
           final case class Str(value: String) extends Value
                            ^
On line 4: warning: The outer reference in this type test cannot be checked at run time.
           final case class Bool(value: Boolean) extends Value
                            ^
On line 5: warning: The outer reference in this type test cannot be checked at run time.

Those warnings weren't there in 2.13.1.

[dwijnand]

Same as #11534? (via @som-snytt)

[Jasper-M]

Looks like the fix didn't get merged forward in time for 2.13.2.

[SethTisue]

hmm, that's odd. but in any case, HEAD of 2.13.x has the change.