Log message:
scala: minor pkglint fixes

Log message:
scala: update to version 2.13.10

Changelog (taken from https://github.com/scala/scala/releases):

Scala 2.13.10 Latest

The Scala team at Lightbend is pleased to announce the availability of Scala 2.13.10.

The following changes are highlights of this release:
Binary compatibility regression fixed

    Fix 2.13.9 regression which broke binary compatibility of case classes which \ 
are also value classes (#10155)

Library maintainers should avoid publishing libraries using Scala 2.13.9.
Other notable changes

    Fix 2.13.9 regression in linting, causing spurious "variable x is never \ 
used" warnings (#10154)
    -Xsource:3 now respects refinements by whitebox macro overrides (#10160 by \ 
@som-snytt)
    Scaladoc tool: fix parsing bug which could cause very slow performance or \ 
incorrect output (#10175 by @liang3zy22)
    Restore -Vprint-args, for echoing arguments provided to compiler (#10164 by \ 
@som-snytt)

For the complete 2.13.10 change lists, see all merged PRs and all closed bugs.
Compatibility

As usual for our minor releases, Scala 2.13.10 is binary-compatible with the \ 
whole Scala 2.13 series.

Upgrading from 2.12? Enable -Xmigration while upgrading to request migration \ 
advice from the compiler.
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.

We especially acknowledge and thank A. P. Marki, also known as Som Snytt, who is \ 
responsible for an especially large share of the improvements in this release.

This release was brought to you by 6 contributors, according to git shortlog -sn \ 
--no-merges @ ^v2.13.9 ^2.12.x. Thank you A. P. Marki, Liang Yan, Seth Tisue, \ 
Antoine Parent, Luc Henninger, 梦境迷离.

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):

    Bump the scalaVersion setting in your sbt-based project
    Download a distribution from scala-lang.org
    Obtain JARs via Maven Central

Scala 2.13.9

The following changes are highlights of this release:
Regression

Library maintainers should avoid publishing libraries using Scala 2.13.9. Please \ 
use 2.13.10 instead. 2.13.9 has a regression where binary-incompatible bytecode \ 
is emitted for case classes which are also value classes (case class ... extends \ 
AnyVal).
Compatibility with Scala 3

    Tasty Reader: Add support for Scala 3.2 (#10068)
    Tasty Reader: Restrict access to experimental definitions (#10020)
    To aid cross-building, accept and ignore using in method calls (#10064 by \ 
@som-snytt)
    To aid cross-building, allow ? as a wildcard even without -Xsource:3 (#9990)
    Make Scala-3-style implicit resolution explicitly opt-in rather than bundled \ 
in -Xsource:3 (#10012 by @povder)
    Prefer type of overridden member when inferring (under -Xsource:3) (#9891 by \ 
@som-snytt)

JDK version support

    Make -release more useful, deprecate -target, align with Scala 3 (#9982 by \ 
@som-snytt)
    Support JDK 19 (#10001 by @Philippus)

Warnings and lints

    Add -Wnonunit-statement to warn about discarded values in statement position \ 
(#9893 by @som-snytt)
    Make unused-import warnings easier to silence (support filtering by origin=) \ 
(#9939 by @som-snytt)
    Add -Wperformance lints for *Ref boxing and nonlocal return (#9889 by @som-snytt)

Language improvements

    Improve support for Unicode supplementary characters in identifiers and \ 
string interpolation (#9805 by @som-snytt)

Compiler options

    Use subcolon args to simplify optimizer options (#9810 by @som-snytt)
    For troubleshooting compiler, add -Vdebug-type-error (and remove \ 
-Yissue-debug) (#9824 by @tribbloid)

Security

    Error on source files with Unicode directional formatting characters (#10017)
    Prevent Function0 execution during LazyList deserialization (#10118)

Bugfixes

    Emit all bridge methods non-final (perhaps affecting serialization compat) \ 
(#9976)
    Fix null-pointer regression in Vector#prependedAll and Vector#appendedAll (#9983)
    Improve concurrent behavior of Java ConcurrentMap wrapper
    (#10027 by @igabaydulin)
    Preserve null policy in wrapped Java Maps (#10129 by @som-snytt)

Changes that shipped in Scala 2.12.16 and 2.12.17 are also included in this release.

For the complete 2.13.9 change lists, see all merged PRs and all closed bugs.
Compatibility

As usual for our minor releases, Scala 2.13.9 is binary-compatible with the \ 
whole Scala 2.13 series.

Upgrading from 2.12? Enable -Xmigration while upgrading to request migration \ 
advice from the compiler.
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.

We especially acknowledge and thank A. P. Marki, also known as Som Snytt, who is \ 
responsible for an especially large share of the improvements in this release.

This release was brought to you by 27 contributors, according to git shortlog \ 
-sn --no-merges @ ^v2.13.8 ^2.12.x. Thank you A. P. Marki, Lukas Rytz, Seth \ 
Tisue, Jamie Thompson, Sébastien Doeraene, Scala Steward, Georgi Krastev, Jason \ 
Zaugg, Philippus, Balys Anikevicius, Gilad Hoch, NthPortal, Zhang Zhipeng, Arman \ 
Bilge, Dale Wijnand, Dominik Helm, Eric Huang, Guillaume Martres, Harrison \ 
Houghton, Krzysztof Pado, Michał Pałka, Zeeshan Arif, counter2015, \ 
jxnu-liguobin, mcallisto, naveen, philwalk.

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):

    Bump the scalaVersion setting in your sbt-based project
    Download a distribution from scala-lang.org
    Obtain JARs via Maven Central

Scala 2.13.8

The Scala team at Lightbend is pleased to announce the availability of Scala 2.13.8.

This is a modest, incremental release focused on addressing regressions in 2.13.7.
Highlights

    Make REPL work again on Mac M1 (upgrade JLine & JNA) (#9807 by @SethTisue)
    Fix slicing of views of IndexedSeqs (including fixing 2.13.7 reverseIterator \ 
regression) (#9799 by @som-snytt)
    Fix 2.13.7 regression in implicit resolution (#9829 by @joroKr21)
    Fix 2.13.7 releaseFence regression affecting GraalVM compatibility (#9825 by \ 
@lrytz)
    Fix 2.13.7 regression affecting wildcards and F-bounded types (#9806 by \ 
@joroKr21)

A few small changes that will ship in 2.12.16 are also included in this release.

For the complete 2.13.8 change lists, see all merged PRs and all closed bugs.
Compatibility

As usual for our minor releases, Scala 2.13.8 is binary-compatible with the \ 
whole Scala 2.13 series.

Upgrading from 2.12? Enable -Xmigration while upgrading to request migration \ 
advice from the compiler.
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 8 contributors, according to git shortlog -sn \ 
--no-merges @ ^v2.13.7 ^2.12.x. Thank you A. P. Marki, Seth Tisue, Georgi \ 
Krastev, Jason Zaugg, Lukas Rytz, Martijn Hoekstra, Philippus Baalman, Chris \ 
Kipp.

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):

    Bump the scalaVersion setting in your sbt-based project
    Download a distribution from scala-lang.org
    Obtain JARs via Maven Central

Scala 2.13.7

The Scala team at Lightbend is pleased to announce the availability of Scala 2.13.7.
Align with Scala 3

    Update TASTy reader to support Scala 3.1 (#9791 by @bishabosha)
    Allow import x.{*, given} under -Xsource:3 (#9724 by @smarter)
    Allow case in pattern bindings even without -Xsource:3 (#9721 by @smarter)
    Deprecate top-level wildcard type parameters (#9712 by @som-snytt)

JDK and Java compatibility

    Support JDK 18 (#9702 by @SethTisue)
    Support JDK 16 records in Java sources (#9551 by @harpocrates)
    Allow concrete private interface methods in Java sources (#9748 by @dengziming)
    Use StringConcatFactory for string concatenation on JDK 9+ (#9556 by \ 
@harpocrates)

Android compatibility

    Add ClassValueCompat to support systems without java.lang.ClassValue (such \ 
as Android) (#9752 by @nwk37011)
    For Android compatibility, make Statics.releaseFence() also catch \ 
NoSuchMethodException for java.lang.invoke.VarHandle.releaseFence() call (#9739 \ 
by @nwk37011)

Concurrency

    Fix asymmetric failure behavior of Future#{zip,zipWith,traverse,sequence} by \ 
making them fail fast regardless of ordering (#9655 by @lihaoyi)

Collections

    Make ArrayBuffer's iterator fail fast when buffer is mutated (#9258 by \ 
@NthPortal)
    Fix ArrayOps bugs (by avoiding ArraySeq#array, which does not guarantee \ 
element type) (#9641 by @som-snytt)
    Deprecate IterableOps.toIterable (#9774 by @lrytz)

Other changes

    Accept supplementary Unicode characters in identifiers (#9687 by @som-snytt)
    Improve tab completion and code assist in REPL (#9656 by @retronym)

Some small changes that will ship in 2.12.16 are also included in this release.

For the complete 2.13.7 change lists, see all merged PRs and all closed bugs.
Compatibility

As usual for our minor releases, Scala 2.13.7 is binary-compatible with the \ 
whole Scala 2.13 series.

Upgrading from 2.12? Enable -Xmigration while upgrading to request migration \ 
advice from the compiler.
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 25 contributors, according to git shortlog \ 
-sn --no-merges @ ^v2.13.6 ^2.12.x. Thank you A. P. Marki, Lukas Rytz, Seth \ 
Tisue, Jason Zaugg, Jamie Thompson, NthPortal, Georgi Krastev, Guillaume \ 
Martres, Dale Wijnand, Martijn Hoekstra, Alec Theriault, Rafał Sumisławski, \ 
Matt Dziuban, Li Haoyi, Doug Roper, Sébastien Doeraene, VladKopanev, danicheg, \ 
dengziming, megri, nwk37011, Magnolia.K, 梦境迷离, Mathias, James Judd.

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):

    Bump the scalaVersion setting in your sbt-based project
    Download a distribution from scala-lang.org
    Obtain JARs via Maven Central

Scala 2.13.6

The Scala 2 team at Lightbend is pleased to announce the availability of Scala \ 
2.13.6.
Highlights

    TASTy Reader support for Scala 3.0.0 (#9617 by @bishabosha)
    The splain compiler plugin by @tek was integrated into the compiler, \ 
available with the -Vimplicits and -Vtype-diffs flags (#7785)
    Escaped double quotes now work as expected in string interpolations, both \ 
s"\"" and s"$"" (#8830 by @eed3si9n and #9536 by \ 
@martijnhoekstra)

Other Changes

    Optimized BigInt implementation (#9628) by @denisrosset
    Support JDK15 text blocks in Java parser (#9548) by @harpocrates
    Stricter override checking for protected Scala members which override Java \ 
members (#9525) by @kynthus
    Check private[this] members in override checking (#9542)
    More accurate outer checks in patterns (#9504)
    Allow renaming imports from _root_ (#9482) by @som-snytt
    Make more annotations extend ConstantAnnotation (9336) by @BalmungSan
    A number of syntax changes were added to simplify cross-building between \ 
Scala 2 and 3
        Don't error (only warn) on symbol literals under -Xsource:3 (#9602)
        Support writing & instead of with in types under -Xsource:3 (#9594)
        Support Scala 3 vararg splice syntax under -Xsource:3 (#9584)
        Support Scala 3 wildcard and renaming imports under -Xsource:3 (#9582)
        Allow soft keywords open and infix under -Xsource:3 (#9580)
        Align leading infix operator with Scala 3 improvements (#9567)
        Support ? as wildcard marker under -Xsource:3 (#9560)
        Support case in pattern bindings under -Xsource:3 (#9558)
        Parse +_ and -_ in types as identifiers under -Xsource:3 to support \ 
Scala 3.2 placeholder syntax (#9605)

Some small changes that will ship in 2.12.14 are also included in this release.

For the complete 2.13.6 change lists, see all merged PRs and all closed bugs.
Compatibility

As usual for our minor releases, Scala 2.13.6 is binary-compatible with the \ 
whole Scala 2.13 series.

Upgrading from 2.12? Enable -Xmigration while upgrading to request migration \ 
advice from the compiler.
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 25 contributors, according to git shortlog \ 
-sn --no-merges HEAD ^v2.13.5 ^2.12.x. Thank you A. P. Marki, Lukas Rytz, Dale \ 
Wijnand, Jamie Thompson, Seth Tisue, 梦境迷离, Guillaume Martres, Martijn \ 
Hoekstra, Denis Rosset, Aaron S. Hawley, Kai, Eugene Yokota, Jason Zaugg, \ 
Anatolii Kmetiuk, Ikko Ashimine, superseeker13, Eugene Platonov, Diego E. Alonso \ 
Blas, Filipe Regadas, Hatano Yuusuke, Luis Miguel Mejía Suárez, Rafał \ 
Sumisławski, Alec Theriault, Tom Grigg, Torsten Schmits.

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):

    Bump the scalaVersion setting in your sbt-based project
    Download a distribution from scala-lang.org
    Obtain JARs via Maven Central

Scala 2.13.5
Scala 2.13.5

The Scala 2 team at Lightbend is pleased to announce the availability of Scala \ 
2.13.5.
Highlights

    TASTy reader: add support for Scala 3.0.0-RC1 (#9501, #9394, #9357) — \ 
thank you @bishabosha!
    Allow name-based extractors to be irrefutable (#9343) — thank you \ 
@martijnhoekstra!
    Upgrade to ASM 9.1, for JDK 16 and 17 support in the optimizer (#9489, #9480)

Other changes

    Assorted improvements to exhaustivity checking in pattern matching (#9479, \ 
#9472, #9474, #9313, #9462)
    Assorted improvements to handling of higher-kinded types, aligning with \ 
Scala 3 (#9400, #9404, #9405, #9414, #9417, #9439) — thank you @joroKr21!
    Make -target support JVM 13, 14, 15, 16, and 17 (#9489, #9481)
    Omit @nowarn annotations from generated code, for forwards compatibility at \ 
compile-time (#9491)
    Add linting of unused context bounds (via -Wunused:synthetics or \ 
-Wunused:params) (#9346) — thank you @som-snytt!
    Lift artificial restrictions on ConstantAnnotations (#9379)
    Make Java Map wrappers handle nulls according to put/remove contract (#9344) \ 
— thank you @som-snytt!
    Make language specification available as a PDF (#7432) — thank you @sake92!

Some small changes that will ship in 2.12.14 are also included in this release.

For complete 2.13.5 change lists, see all merged PRs and all closed bugs.
Compatibility

As usual for our minor releases, Scala 2.13.5 is binary-compatible with the \ 
whole Scala 2.13 series.

Upgrading from 2.12? Enable -Xmigration while upgrading to request migration \ 
advice from the compiler.
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 23 contributors, according to git shortlog \ 
-sn --no-merges HEAD ^v2.13.4 ^2.12.x. Thank you Seth Tisue, A. P. Marki, Dale \ 
Wijnand, NthPortal, Jamie Thompson, Lukas Rytz, Martijn Hoekstra, Georgi \ 
Krastev, Jason Zaugg, Jasper Moeys, Sakib Hadziavdic, Anatolii Kmetiuk, Arnaud \ 
Gourlay, Marcono1234, Chia-Ping Tsai, Mike Skells, Stefan Zeiger, Waleed Khan, \ 
Yann Bolliger, Guillaume Martres, 梦境迷离, Ethan Atkins, Darcy Shen.

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):

    Bump the scalaVersion setting in your sbt-based project
    Download a distribution from scala-lang.org
    Obtain JARs via Maven Central

Scala 2.13.4

Scala 2.13.4:

    Restores default global ExecutionContext to 2.12 behavior
    Improves pattern matching, especially in exhaustivity checking
    Adds experimental support for consuming some libraries built by Scala 3

and more! Details below.
Concurrency

NOTE The following change affects parallelism and performance. If you use \ 
scala.concurrent.ExecutionContext.global you may
want to adapt your code. (But note that Akka is unaffected, because it uses its \ 
own execution contexts.)

In 2.13.0 we made ExecutionContext.global "opportunistic". This \ 
enabled "batching" of nested tasks
to execute on the same thread, avoiding an expensive context switch. That \ 
strategy requires
user code to wrap long-running and/or blocking tasks with blocking { ... } to \ 
maintain parallel
execution.

For 2.13.4, we restore 2.12's default non-batching behavior, which is safer for \ 
arbitrary user code. Users wanting
increased performance may override the default, if they believe their code uses \ 
blocking correctly.
We make that choice available via ExecutionContext.opportunistic.

Using ExecutionContext.opportunistic requires a bit of extra boilerplate, made \ 
necessary by binary
compatibility constraints on the standard library. Detailed instructions are in
ExecutionContext.global's Scaladoc.

Further detail: #9270/#9296/scala/bug#12089,
Pattern matching

The pattern matcher is now much better at warning you if a match isn't exhaustive.

The following types of matches no longer disable exhaustivity checking:

    guards (case <pattern> if <condition> => ...) #9140
    custom extractors (user-defined unapply or unapplySeq) #9140/#9162
    unsealed types, if you opt in via -Xlint or -Xlint:strict-unsealed-patmat \ 
#9140/#9299

Additionally,

    private classes are now treated as if sealed #9211
    singleton types no longer prematurely widen #9209
    tuples are handled properly #9147/#9163/#9147

New warnings reported can be resolved by:

    adding any missing cases
    in the case of complementary guards (e.g. if n > 0 and if n <= 0) by \ 
dropping the last guard
    for custom extractors: demarking irrefutable extractors as such, by defining \ 
the return type as Some
    for sealed types: marking traits or parent classes sealed, parent classes \ 
abstract, and classes final
    explicitly declaring the default case: case x => throw new MatchError(x)

Otherwise, your options for suppressing warnings include:

    annotate the scrutinee with @unchecked, such as (foo: @unchecked) match { ... }
    disable exhaustivity checking in the presence of guards and custom \ 
extractors with -Xnon-strict-patmat-analysis
    disable exhaustivity checking of unsealed types with \ 
-Xlint:-strict-unsealed-patmat
    use -Wconf to suppress the warnings globally, with e.g. -Wconf:msg=match may \ 
not be exhaustive:i

Scala 3 interop

This release enables the Scala 2 compiler to consume some libraries built in \ 
Scala 3. #9109/#9293

The new capability is experimental. To enable it, add -Ytasty-reader to your \ 
compiler options.

Not all Scala 3 built libraries are supported, because not all Scala 3 features \ 
can be supported.
The library author must stay within the supported subset.

For more details and caveats see the blog post Forward Compatibility for the \ 
Scala 3 Transition.
Standard library changes

    When compiling on JDK 15, avoid clash with new CharSequence#isEmpty method #9292
        The clash is avoided by making CharSequence wrappers in Predef non-implicit.
        The change is binary compatible, but not source compatible. Call sites \ 
may need updating.
    Make LazyList.cons.apply lazier #9095
    Make MapView#values preserve laziness #9090
    Make ListBuffer's iterator fail when the buffer is mutated #9174
    Un-deprecate useful StringOps methods, despite Unicode concerns #9246

Compiler changes

    Allow using classOf with object type (e.g. classOf[Foo.type]) #9279
    Fix back-quoted constructor params with identical prefixes #9008
    Enable range positions (-Yrangepos) by default #9146

Other changes

Some changes that will also ship in 2.12.13 are also included in this release, \ 
most notably:

    When compiling on JDK 15, avoid clash with new CharSequence#isEmpty method #9292
        To avoid the clash, implicit was removed from Predef's implicit \ 
conversions to SeqCharSequence and ArrayCharSequence.
        This change is binary compatible, but not source compatible. User code \ 
may need updating. See PR for details.

For complete 2.13.4 change lists, see all merged PRs and all closed bugs.
Compatibility

As usual for our minor releases, Scala 2.13.4 is binary-compatible with the \ 
whole Scala 2.13 series.

Upgrading from 2.12? Enable -Xmigration while upgrading to request migration \ 
advice from the compiler.
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 40 contributors, according to git shortlog \ 
-sn --no-merges HEAD ^v2.13.3 ^2.12.x. Thank you Jamie Thompson, Dale Wijnand, \ 
A. P. Marki, NthPortal, Lukas Rytz, Seth Tisue, Jason Zaugg, Georgi Krastev, \ 
Eugene Yokota, Martijn Hoekstra, Trey Cahill, Rado Buransky, Ergys Dona, Mike \ 
Skells, Greg Pfeil, Kazuhiro Sera, Mitsuhiro Shibuya, NagaChaitanya Vellanki, \ 
Sergei Petunin, Sébastien Doeraene, Takahashi Osamu, Viktor Klang, mwielocha, \ 
Nicolas Stucki, Jan Arne Sparka, Philippus Baalman, Glenn Liwanag, Rafał \ 
Sumisławski, Renato Cavalcanti, Sergei, nooberfsh, Dmitrii Naumenko, Simão \ 
Martins, counter2015, Jian Lan, Liu Fengyun, Kanishka, Julien Richard-Foy, Janek \ 
Bogucki, Björn Regnell.

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):

    Bump the scalaVersion setting in your sbt-based project
    Download a distribution from scala-lang.org
    Obtain JARs via Maven Central

Scala 2.13.3

Scala 2.13.3 is primarily a bugfix release.

It also includes:

    improvements to warnings and linting
    experimental -Xasync support

For more detail, read on.
Behavior changes

    Symbol#toString is now Symbol(foo) instead of the deprecated single-quote \ 
form 'foo (#8933)

Bugfixes

    Fix 2.13-only bug in Java collection converters that caused some operations \ 
to perform an extra pass (#9058)
    Fix 2.13.2 performance regression in Vector: restore special cases for small \ 
operands in appendedAll and prependedAll (#9036)
    Increase laziness of #:: for LazyList (#8985)
    Allow trailing backslash in string interpolators (#8942)
    Respect @uncheckedVariance in higher-kinded types (fixing 2.13.2 regression) \ 
(#8938)

Warnings and linting

    Deprecate auto-application of (non-Java-defined) methods with a single empty \ 
parameter list (#8833)
        The PR has instructions for suppressing the warning if it is unwanted
    Warn by default on mismatch of presence/absence of an empty parameter list \ 
when overriding (#8846)
        -Xlint:nullary-override is no longer accepted, since this now warns by \ 
default
    Discourage multi-argument infix syntax: lint applications (x op (a, b)), \ 
also lint operator-name definitions (#8951)
    Fix @nowarn to use correct semantics for & (#9032)
    Make -Wunused:imports work again even when -Ymacro-annotations is enabled (#8962)
    Replace -Wself-implicit with -Xlint:implicit-recursion (#9019)
    Under -Xsource:3, disallow auto-eta-expansion of SAMs (#9049)

Experimental -Xasync

This successor to scala-async allows usage with other effect systems besides \ 
scala.concurrrent.Future.

    Compiler support for scala-async; enable with -Xasync (#8816)

We will publish a blog post with more detail on this work by @retronym, building \ 
on his earlier collaboration with @phaller. In the meantime, see the PR \ 
description.

This feature will also be included in the 2.12.12 release.
Other changes

For complete 2.13.3 change lists, see all merged PRs and all closed bugs.

Some changes that will ship in 2.12.12 are also included in this release, most \ 
notably:

    Annotation parsing & @Deprecated (#8781)
    Fix Scaladoc tool on JDK 11 with -release 8: exclude sig files in \ 
Symbol#sourceFile (#8849)

Compatibility

As usual for our minor releases, Scala 2.13.3 is binary-compatible with the \ 
whole Scala 2.13 series.

Upgrading from 2.12? Enable -Xmigration during upgrade to request migration \ 
advice from the compiler.
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 28 contributors, according to git shortlog \ 
-sn --no-merges HEAD ^v2.13.2 ^2.12.x. Thank you A. P. Marki, Jason Zaugg, Seth \ 
Tisue, Dale Wijnand, Lukas Rytz, Georgi Krastev, David Barri, Eugene Yokota, \ 
Diego E. Alonso Blas, Akhtiam Sakaev, Glenn Liwanag, changvvb, Evgeny Ganchurin, \ 
Mike Skells, Martijn Hoekstra, yudedako, Anatolii Kmetiuk, Gilles Peiffer, \ 
JyotiSachdeva.ext, Karol Chmist, Kenji Yoshida, Lorenzo Costanzia di \ 
Costigliole, NthPortal, Steven Barnes, Sébastien Doeraene, Travis Brown, \ 
counter2015, nogurenn.

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):

    Bump the scalaVersion setting in your sbt-based project
    Download a distribution from scala-lang.org
    Obtain JARs via Maven Central

Scala 2.13.2

Scala 2.13.2 has:

    a brand-new Vector implementation
    configurable warnings
    an improved REPL (now JLine 3 based)
    bugfixes and more

Vector

    Rewrite Vector (using "radix-balanced finger tree vectors"), for \ 
performance (#8534)

Small vectors are now more compactly represented. Some operations are now \ 
drastically faster on large vectors. A few operations may be a little slower.

Kudos to @szeiger for this work.
Configurable warnings

    Add -Wconf flag for configurable warnings, @nowarn annotation for local \ 
suppression (#8373)

Note that scala-collection-compat 2.1.6 (or newer) provides @nowarn for \ 
cross-built projects (as a no-op on 2.11 and 2.12).

Special thanks to Roman Janusz (@ghik), whose silencer plugin was the basis for \ 
this work.
REPL improvements

    REPL: upgrade to JLine 3 (benefits include multi-line editing) (#8036)
    Default true -Yrepl-class-based and -Yuse-magic-imports (#8748)
        -Yrepl-class-based avoids deadlocks
        -Yuse-magic-imports improves performance for long sessions
    Improve REPL display of method types (#8319)

Special thanks to @som-snytt for spearheading the JLine 3 upgrade.

We are tracking JLine-related improvements and regressions here. There some \ 
known regressions in some less-vital features and behaviors; we plan to address \ 
these in future 2.13.x releases.
Language changes

    Unicode escapes are now ordinary escape sequences (not processed early) (#8282)

Compiler fixes

    Plug many variance holes (in higher-kinded types, refined types, and private \ 
inner classes) (#8545)
    Fix variance handling for parameterized type aliases (#8651)
    Exclude universal members (getClass, toString, etc) from root module import \ 
(#8541)
    Matching strings makes switches in bytecode (#8451)

Deprecations

    Deprecate eta-expansion, via trailing underscore, of methods with no \ 
argument lists (#8836)
    Deprecate nested class shadowing in "override" position (#8705)
    Deprecate numeric conversions that lose precision (e.g., Long to Double) (#8679)
    Deprecate numeric widening of numeric literals which are not representable \ 
with Float/Double (#8757)
    Deprecate old-style constructor syntax (#8591)

Improvements from the future

    There is no more -Xsource:2.14, only -Xsource:3 (#8812)
    Allow infix operators at start of line (under -Xsource:3) (#8419)
    Case class copy and apply inherit access modifiers from constructor (under \ 
-Xsource:3) (#7702)

Other fixes and improvements

    Un-deprecate default floating point Orderings; issue migration warning \ 
instead under -Xmigration (#8721)
    Support macro annotation expansions in -Wmacros:MODE (#8799)
    Scaladoc can now link to Javadoc for the Java standard library for JDK \ 
versions 9 and up (overridable with new -jdk-api-doc-base flag) (#8663)
    sys.env now throws on null environment variable (#8579)
    Make the hashcode method ## have no parameter list (instead of a single \ 
empty one) (#8814)

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

2.13.2 also includes the changes in Scala 2.12.11, most notably:

    Make optimizer work on JDK 13+ (#8676).

Compatibility

As usual for our minor releases, Scala 2.13.2 is binary-compatible with the \ 
whole Scala 2.13 series.

Upgrading from 2.12? Enable -Xmigration while upgrading to request migration \ 
advice from the compiler.
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 45 contributors, according to git shortlog \ 
-sn --no-merges HEAD ^v2.13.1 ^2.12.x. Thank you Som Snytt, Jason Zaugg, Lukas \ 
Rytz, Dale Wijnand, Seth Tisue, Diego E. Alonso Blas, Georgi Krastev, Martijn \ 
Hoekstra, Eugene Yokota, Harrison Houghton, Stefan Zeiger, NthPortal, Anatolii, \ 
Linas Medžiūnas, Aaron S. Hawley, Guillaume Martres, Josh Lemer, Sébastien \ 
Doeraene, Jasper Moeys, Julien Truffaut, Oskar Haarklou Veileborg, Lucas \ 
Cardoso, Andrew Valencik, Adriaan Moors, yudedako, Steven Barnes, Brian Wignall, \ 
Ausmarton Zarino Fernandes, Oguz Albayrak, Philippus, Viktor Klang, Yang Bo, \ 
bnyu, psilospore, sinanspd, wholock, Jamie Thompson, Hamza Meknassi, Janek \ 
Bogucki, Flash Sheridan, Fabian Page, Kenji Yoshida, Denis Rosset, Lucas S \ 
Cardoso, Chris Birchall.

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):

    Bump the scalaVersion setting in your sbt-based project
    Download a distribution from scala-lang.org
    Obtain JARs via Maven Central

Scala 2.13.1

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)
    Fix HashMap#mapValuesInPlace (#8421)

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

Upgrading from 2.12? Enable -Xmigration while upgrading to request migration \ 
advice from the compiler.

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):

    Bump the scalaVersion setting in your sbt-based project
    Download a distribution from scala-lang.org
    Obtain JARs via Maven Central

Log message:
lang: Replace RMD160 checksums with BLAKE2s checksums

All checksums have been double-checked against existing RMD160 and
SHA512 hashes

The following distfiles could not be fetched (possibly fetched
conditionally?):

./lang/rust-bin/distinfo rust-bin-1.54.0/rust-1.54.0-aarch64-unknown-linux-gnu.tar.gz
./lang/rust-bin/distinfo \ 
rust-bin-1.54.0/rust-1.54.0-aarch64-unknown-linux-musl.tar.gz
./lang/rust-bin/distinfo rust-bin-1.54.0/rust-1.54.0-aarch64-unknown-netbsd.tar.gz
./lang/rust-bin/distinfo \ 
rust-bin-1.54.0/rust-1.54.0-armv7-unknown-netbsd-eabihf.tar.gz
./lang/rust-bin/distinfo rust-bin-1.54.0/rust-1.54.0-i686-unknown-linux-gnu.tar.gz
./lang/rust-bin/distinfo rust-bin-1.54.0/rust-1.54.0-powerpc-unknown-netbsd90.tar.gz
./lang/rust-bin/distinfo rust-bin-1.54.0/rust-1.54.0-sparc64-unknown-netbsd.tar.gz
./lang/rust-bin/distinfo rust-bin-1.54.0/rust-1.54.0-x86_64-apple-darwin.tar.gz
./lang/rust-bin/distinfo rust-bin-1.54.0/rust-1.54.0-x86_64-unknown-freebsd.tar.gz
./lang/rust-bin/distinfo rust-bin-1.54.0/rust-1.54.0-x86_64-unknown-linux-gnu.tar.gz
./lang/rust-bin/distinfo rust-bin-1.54.0/rust-1.54.0-x86_64-unknown-linux-musl.tar.gz
./lang/smlnj/distinfo smlnj-110.73/boot.ppc-unix.tgz
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./lang/oracle-jre8/distinfo jce_policy-8.zip
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./lang/oracle-jre8/distinfo jre-8u202-linux-x64.tar.gz
./lang/oracle-jre8/distinfo jre-8u202-macosx-x64.tar.gz
./lang/oracle-jre8/distinfo jre-8u202-solaris-x64.tar.gz
./lang/oracle-jdk8/distinfo jdk-8u202-linux-i586.tar.gz
./lang/oracle-jdk8/distinfo jdk-8u202-linux-x64.tar.gz
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./lang/rust/distinfo rust-1.53.0-aarch64-unknown-linux-gnu.tar.gz
./lang/rust/distinfo rust-1.53.0-aarch64-unknown-netbsd.tar.gz
./lang/rust/distinfo rust-1.53.0-aarch64_be-unknown-netbsd.tar.gz
./lang/rust/distinfo rust-1.53.0-arm-unknown-linux-gnueabihf.tar.gz
./lang/rust/distinfo rust-1.53.0-armv7-unknown-linux-gnueabihf.tar.gz
./lang/rust/distinfo rust-1.53.0-i686-unknown-linux-gnu.tar.gz
./lang/rust/distinfo rust-1.53.0-powerpc-unknown-netbsd.tar.gz
./lang/rust/distinfo rust-1.53.0-powerpc-unknown-netbsd90.tar.gz
./lang/rust/distinfo rust-1.53.0-sparc64-unknown-netbsd.tar.gz
./lang/rust/distinfo rust-1.53.0-x86_64-apple-darwin.tar.gz
./lang/rust/distinfo rust-1.53.0-x86_64-unknown-freebsd.tar.gz
./lang/rust/distinfo rust-1.53.0-x86_64-unknown-illumos.tar.gz
./lang/rust/distinfo rust-1.53.0-x86_64-unknown-linux-gnu.tar.gz
./lang/rust/distinfo rust-std-1.53.0-aarch64-apple-darwin.tar.gz
./lang/rust/distinfo rust-std-1.53.0-aarch64-unknown-linux-gnu.tar.gz
./lang/rust/distinfo rust-std-1.53.0-aarch64-unknown-netbsd.tar.gz
./lang/rust/distinfo rust-std-1.53.0-aarch64_be-unknown-netbsd.tar.gz
./lang/rust/distinfo rust-std-1.53.0-arm-unknown-linux-gnueabihf.tar.gz
./lang/rust/distinfo rust-std-1.53.0-armv7-unknown-linux-gnueabihf.tar.gz
./lang/rust/distinfo rust-std-1.53.0-i686-unknown-linux-gnu.tar.gz
./lang/rust/distinfo rust-std-1.53.0-powerpc-unknown-netbsd.tar.gz
./lang/rust/distinfo rust-std-1.53.0-powerpc-unknown-netbsd90.tar.gz
./lang/rust/distinfo rust-std-1.53.0-sparc64-unknown-netbsd.tar.gz
./lang/rust/distinfo rust-std-1.53.0-x86_64-apple-darwin.tar.gz
./lang/rust/distinfo rust-std-1.53.0-x86_64-unknown-freebsd.tar.gz
./lang/rust/distinfo rust-std-1.53.0-x86_64-unknown-linux-gnu.tar.gz
./lang/smlnj11072/distinfo smlnj-110.72/boot.ppc-unix.tgz
./lang/smlnj11072/distinfo smlnj-110.72/boot.sparc-unix.tgz
./lang/ghc84/distinfo ghc-8.0.2-boot-x86_64-unknown-solaris2.tar.xz
./lang/ghc84/distinfo ghc-8.4.4-boot-i386-unknown-freebsd.tar.xz
./lang/ghc84/distinfo ghc-8.4.4-boot-x86_64-apple-darwin.tar.xz
./lang/ghc84/distinfo ghc-8.4.4-boot-x86_64-unknown-freebsd.tar.xz
./lang/ghc7/distinfo ghc-7.10.3-boot-i386-unknown-freebsd.tar.xz
./lang/ghc7/distinfo ghc-7.6.3-boot-i386-unknown-solaris2.tar.xz
./lang/ghc7/distinfo ghc-7.6.3-boot-powerpc-apple-darwin.tar.xz
./lang/ghc7/distinfo ghc-7.6.3-boot-x86_64-unknown-solaris2.tar.xz
./lang/ghc90/distinfo ghc-8.10.4-boot-x86_64-unknown-solaris2.tar.xz
./lang/ghc90/distinfo ghc-9.0.1-boot-aarch64-unknown-netbsd.tar.xz
./lang/ghc90/distinfo ghc-9.0.1-boot-i386-unknown-freebsd.tar.xz
./lang/ghc90/distinfo ghc-9.0.1-boot-x86_64-apple-darwin.tar.xz
./lang/ghc90/distinfo ghc-9.0.1-boot-x86_64-unknown-freebsd.tar.xz
./lang/openjdk8/distinfo \ 
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./lang/openjdk8/distinfo \ 
openjdk7/bootstrap-jdk-1.7.76-netbsd-7-sparc64-20150301.tar.xz
./lang/openjdk8/distinfo \ 
openjdk7/bootstrap-jdk-1.8.181-netbsd-8-aarch64-20180917.tar.xz
./lang/openjdk8/distinfo \ 
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openjdk7/bootstrap-jdk7u60-bin-dragonfly-3.8-amd64-20140719.tar.bz2
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./lang/go-bin/distinfo go1.14.2.linux-386.tar.gz
./lang/go-bin/distinfo go1.14.2.linux-amd64.tar.gz
./lang/go-bin/distinfo go1.14.2.linux-arm64.tar.gz
./lang/go-bin/distinfo go1.14.2.linux-armv6l.tar.gz
./lang/go-bin/distinfo go1.14.2.netbsd-arm64.tar.gz
./lang/go-bin/distinfo go1.16beta1.darwin-arm64.tar.gz
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./lang/sun-jre7/distinfo UnlimitedJCEPolicyJDK7.zip
./lang/sun-jre7/distinfo jre-7u80-linux-x64.tar.gz
./lang/sun-jre7/distinfo jre-7u80-solaris-i586.tar.gz
./lang/sun-jre7/distinfo jre-7u80-solaris-x64.tar.gz
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./lang/ghc88/distinfo ghc-8.4.4-boot-x86_64-apple-darwin.tar.xz
./lang/ghc88/distinfo ghc-8.4.4-boot-x86_64-unknown-freebsd.tar.xz
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./lang/gcc-aux/distinfo ada-bootstrap.x86_64.dragonfly.36A.tar.bz2
./lang/gcc-aux/distinfo ada-bootstrap.x86_64.freebsd.100B.tar.bz2
./lang/gcc-aux/distinfo ada-bootstrap.x86_64.freebsd.84.tar.bz2
./lang/gcc-aux/distinfo ada-bootstrap.x86_64.solaris.511.tar.bz2
./lang/gcc6/distinfo ecj-4.5.jar
./lang/openjdk11/distinfo bootstrap-jdk-1.11.0.7.10-netbsd-9-aarch64-20200509.tar.xz
./lang/sun-jdk7/distinfo jdk-7u80-linux-x64.tar.gz
./lang/sun-jdk7/distinfo jdk-7u80-solaris-i586.tar.gz
./lang/sun-jdk7/distinfo jdk-7u80-solaris-x64.tar.gz

Log message:
lang: Remove SHA1 hashes for distfiles

Log message:
(lang/scala) Fix install stage, ${TAR} was not defined

Log message:
all: migrate homepages from http to https

pkglint -r --network --only "migrate"

As a side-effect of migrating the homepages, pkglint also fixed a few
indentations in unrelated lines. These and the new homepages have been
checked manually.

Log message:
Update to 2.13.0

Changelog:
The 2.13.0 release improves Scala in the following areas:

    Collections: Standard library collections have been overhauled
    for simplicity, performance, and safety. This is the centerpiece
    of the release.

    Standard library: Future is faster and more robust. Elsewhere,
    useful classes and methods have been added.

    Language: Literal types, partial unification, by-name implicits,
    more.

    Compiler: 5-10% faster, deterministic output, improved optimizer.

Log message:
all: replace SUBST_SED with the simpler SUBST_VARS

pkglint -Wall -r --only "substitution command" -F

With manual review and indentation fixes since pkglint doesn't get that
part correct in every case.