mdedetrich opened a new pull request, #264:
URL: https://github.com/apache/incubator-pekko/pull/264

   As pointed out in 
https://github.com/apache/incubator-pekko/pull/258#pullrequestreview-1351557344 
I got the `Xlint` options wrong in that pull request. This PR fixes that, but 
in the process of fixing it the Scala compiler for 2.13 specifically found some 
warnings related to unsealed checking of pattern matches such as 
   
   ```
   [error] 
/Users/mdedetrich/github/incubator-pekko/docs/src/test/scala/typed/tutorial_4/DeviceGroup.scala:51:5:
 match may not be exhaustive.
   [error] It would fail on the following input: (x: 
typed.tutorial_4.DeviceGroup.Command forSome x not in 
(typed.tutorial_4.DeviceGroup.DeviceTerminated, 
typed.tutorial_4.DeviceManager.RequestDeviceList, 
typed.tutorial_4.DeviceManager.RequestTrackDevice))
   [error]     msg match {
   ```
   
   This is the reason behind adding `-Xlint:-strict-unsealed-patmat` 
specifically for 2.13. I will make an issue to have a look into this because it 
does seem we might be able to legitimately fix this in the code.


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