Symbol 'type scala.annotation.nowarn' is missing from the classpath

[patriknw]

When compiling an application project with latest Akka (2.6.12+11-b41d6a0c) I see the following:

Symbol 'type scala.annotation.nowarn' is missing from the classpath.
[error] This symbol is required by ' <none>'.
[error] Make sure that type nowarn is in your classpath and check for conflicting dependencies with `-Ylog-classpath`.
[error] A full rebuild may help if 'Eventsourced.class' was compiled against an incompatible version of scala.annotation.

same after clean

Akka compiled with Scala 2.12.13.
Application compiled with Scala 2.12.12

It disappears when changing scalaVersion in the application to 2.12.13.

I guess this is because of the Scala 2.12.12 -> 2.12.13 update in Akka.

Probably nothing we can/should do aside from mentioning in release notes of Akka 2.6.13.

cc @lukas-ryt

[patriknw]

Closing without action, but we should mention it in release notes.

[patriknw]

Perhaps this is a problem with Scala 2.13.4 also? I don't think I tried the same project with that. Noticed that something related was fixed in Scala 2.13.5 scala/scala#9491