I had to fix several compiler errors due to deprecation of auto application of `()`. A related
Xlint config (`-Xlint:nullary-override`) is no longer valid in 2.13, so we now only enable it
for 2.12. The compiler flagged two new inliner warnings that required suppression and
the semantics of `&` in `@nowarn` annotations changed, requiring a small change in
one of the warning suppressions.
I also removed the deprecation of a number of methods in `KafkaZkClient` as
they should not have been deprecated in the first place since `KafkaZkClient` is an
internal class and we still use these methods in the Controller and so on. This
became visible because the Scala compiler now respects Java's `@Deprecated`
annotation.
Finally, I included a few minor clean-ups (eg using `toBuffer` instead `toList`) when fixing
the compilation warnings.
Noteworthy bug fixes in Scala 2.13.3:
* Fix 2.13-only bug in Java collection converters that caused some operations to perform an extra pass
* Fix 2.13.2 performance regression in Vector: restore special cases for small operands in appendedAll and prependedAll
* Increase laziness of #:: for LazyList
* Fixes related to annotation parsing of @Deprecated from Java sources in mixed compilation
Full release notes:
https://github.com/scala/scala/releases/tag/v2.13.3
Reviewers: Manikumar Reddy <manikumar.reddy@gmail.com>
Ismael Juma