Nightly Dotty workflow of 2023-02-20 failed

[github-actions]

See https://github.com/lampepfl/dotty/actions/runs/4219642346

[WojciechMazur]

The build fails in test neg/i16820, the offending line is:

  val x3 = "".formatted // error

Expected error:

val x3 = "".formatted // error
           ^^^^^^^^^^^^
           missing arguments for method formatted in class String

[WojciechMazur]

@Kordyjan Is it possible that's some issue related to the usage of merge queue? The failing tests were merged yesterday from pr #16892

Both of the failing CI runs were skipped in the CI on the pull request

@odersky Can you take a look at these failures? We might require to either fix the failures or re-evaluate should that case actually fail

[Kordyjan]

We run those jobs only on tags and nightly builds, so it is expected that they were skipped.

[smarter]

The test should be changed to not call formatted on String. The problem is that this method is defined as an extension method in Scala, but it has been added as an instance method of String in Java 15 with a different behavior, see scala/bug#12471. This is why only test_java8 and test_windows_full fail, other jobs use a newer jdk.