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Scala 2.13.1 release notes draft
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release-notes.md

Scala 2.13.1 is primarily a bug fix release that fixes several regressions in 2.13.0.

Collection-related regressions

  • Revert Stream.Cons to the 2.12 encoding (#8354)
  • Don't rebuild scala.Seq to drop elems in unapplySeq (#8340)
  • Blacken subtrees where necessary in RedBlackTree.take (#8287)
  • Iterator#flatMap#hasNext calls outer#hasNext 1 time, not 2-3 times (#8220)
  • s.c.Map#values returns a strict Iterable rather than a View (#8195)
  • Vector.from(ArraySeq) copies elems rather than reusing unsafeArray (#8194)
  • Fix mutable.HashSet.addAll: remove redundant call to super method (#8192)
  • Fix mutable.ArraySeq.ofChar#addString (#8176)

Other regressions

  • Avoid spurious "illegal cyclic reference" errors (#8382)
  • Stabilize args of apply (#8202)
  • Reject incomplete implicit dictionaries (#8201)
  • Process exit code on script errors (#8169)
  • Fix type inference involving wildcards (#8129)

Other bug fixes and improvements

  • Extend the Gradle / sbt 0.13 leniency to Windows (#8408)
  • Avoid unnecessary toSeq conversions in Seq methods (#8374)
  • Avoid memory leaks in Stream methods (#8367)
  • Precompile -i files for script runner (#8349)
  • Stop warning on higher-kinded usage without -language:higherKinds (#8348)
  • Simplify reporters (#8338)
  • More efficient ArraySeq iteration (#8300)
  • Enable hyperlinking to Java docs (#8284)
  • Parent implicitNotFound message is supplemental (#8280)
  • Add protected and private visibility filters to scaladoc (#8183)
  • Fix vulnerability in jQuery used in ScalaDoc (#8179)
  • Synthesize a PartialFunction from function literal (#8172)
  • Fix parsing of try (#8071)
  • Support emitting Java 9 bytecode by adding "-target:9" (#8060)
  • Deprecate mutable.MultiMap (#8005)
  • Add syntactic sugar for if(_) (#7707)
  • A foreign definition induces ambiguity (#7609)

This is not a complete list of changes. For that, see all merged PRs and all closed bugs.

Compatibility

As usual for our minor releases, Scala 2.13.1 is binary-compatible with the whole Scala 2.13 series.

Contributors

A big thank you to everyone who's helped improve Scala by reporting bugs, improving our documentation, spreading kindness in discussions around Scala, and submitting and reviewing pull requests! You are all magnificent.

This release was brought to you by 43 contributors, according to git shortlog -sn --no-merges HEAD ^v2.13.0 ^upstream/2.12.x. Thank you Som Snytt, Lukas Rytz, Aaron S. Hawley, exoego, Jason Zaugg, Dale Wijnand, Seth Tisue, Stefan Zeiger, NthPortal, Martijn Hoekstra, Jasper Moeys, Josh Lemer, Isaac Levy, Harrison Houghton, Benjamin Kurczyk, redscarf, 杨博 (Yang Bo), Adriaan Moors, Anatolii Kmetiuk, Eugene Yokota, Georgi Krastev, Miles Sabin, Philippus, xuwei-k, Magnolia.K, Mike Skells, 2efPer, Mitesh Aghera, NomadBlacky, Guillaume Martres, Odd Möller, yui-knk, Georg, Flash Sheridan, Diego E. Alonso Blas, Sébastien Doeraene, Atsushi Araki, psilospore, Akhtyam Sakaev, wanying.chan, Li Haoyi, M.Shibuya, Kota Mizushima.

Thanks to Lightbend for their continued sponsorship of the Scala core team’s efforts. Lightbend offers commercial support for Scala.

Scala 2.13 notes

The release notes for Scala 2.13.0 have important information applicable to the whole 2.13 series.

Obtaining Scala

Scala releases are available through a variety of channels, including (but not limited to):

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