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Scala 2.13.18

The Scala team at Akka is pleased to announce Scala 2.13.18.

This release fixes several regressions from 2.13.17. It is compatible with JDKs 8 to 26.

The following are highlights of this release:

Restore traditional behavior when passing a null array to a varargs method in Scala 3

When passing an array as "sequence argument" to a varargs method, method(arg: _*), the array is converted to a Seq.

In Scala 3 (the syntax is method(arg*)), this conversion is done by the ScalaRunTime.wrapXArray methods. These methods were simplified in 2.13.17, which changed the semantics of a method((null: Array[T])*) invocation.

#11165 restores the previous null handling semantics.

Fixes for false positive warnings

• #11162 reverts -Xlint:infer-any to the behavior of 2.13.16. The lint was extended in 2.13.17 to warn whenever Nothing is inferred for a higher-kinded type parameter T[_]. The new warning showed up in many projects: often as a false positive, but even the "true" positive warning was considered unhelpful / spurious in real-world use cases.
• Fix false positive unused warning for private val used in annotation #11149
• Fix false positive -Xlint:universal-methods warning in synthetic code #11159

JDK 26 support

• Compiling on Java 26 is now supported #11179

New @uncheckedOverride annotation

The new @uncheckedOverride annotation is equivalent to the override keyword, except that it allows to override nothing. This is useful when cross-building: a method may override or not, depending on the version of some dependency. #11179

GPG key change

This release is signed with a different GPG key than previous Scala 2 releases. The new key is the same one used by Scala 3. #11158

Other notable changes

• On Java 25+, sbt run now detects main methods that are non-static, non-public or without parameter list #11137
• Regression fix: 2.13.17 was accidentally dropping certain annotations #11173
• Deprecate the -Xmain-class compiler flag #11156

More changes

For the complete 2.13.18 change lists, see all merged PRs and all closed bugs.

Compatibility

As usual for our minor releases, Scala 2.13.18 is binary-compatible with the whole Scala 2.13 series.

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• 98f40d0 Merge pull request #11180 from SethTisue/scala-3.7.4
• f47ee18 Merge pull request #11181 from lrytz/t13141
• 960905c Don't type check synthetic args in presence of errors
• 5c28ce5 Scala 3.7.4 (was 3.7.3)
• ae6ae4d Merge pull request #11179 from lrytz/merge-212
• e828c8f Merge commit '597789e91a' into merge-212
• c099bae Merge commit '01ad07aaf2' into merge-212
• ef7bf42 Merge commit '516ea3283f' into merge-212
• 786153f Merge commit '42b335a55f' into merge-212
• 597789e Merge pull request #11178 from dragos/dragos/backport-base-type-crash-fix
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