WojciechMazur commented on PR #1398:
URL: https://github.com/apache/pekko/pull/1398#issuecomment-2235966631
It seems like we unfortunately backported a change that caused a regression,
it can be minimized to
```scala
def Test[U, A](thisElem: A, thatElem: U) = {
case object passedEnd
val any: Seq[Any] = ???
any.zip(any)
.map {
case (`passedEnd`, r: U @unchecked) => (thisElem, r)
case (l: A @unchecked, `passedEnd`) => (l, thatElem)
case t: (A, U) @unchecked => t
}
}
```
The 3rd case is reachable so it's a bug.
I'm doing a bisect on the compiler right now before I fill in an issue in
the compiler, but it seems like the regression was present in the Scala Next
series since 3.4.0 (approximately introduced ~ 02.09.2023) so I'm astonished I
was not reported previously.
RC2 would either revert the change that caused the regression or would
include a fix
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