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  public <T> boolean exists(scala.collection.Iterable<T>, scala.Function1<T, java.lang.Object>);
    Code:
       0: new           #19                 // class scala/util/boundary$Label
       3: dup
       4: invokespecial #44                 // Method scala/util/boundary$Label."<init>":()V
       7: astore_3
       8: aload_1
       9: aload_0
      10: aload_2
      11: aload_3

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From scala.xml.pull to javax.xml.stream.events

Want to process XML that's too large to fit in memory?

The Scala standard library used to offer scala.xml.pull for this. It became part of the scala-xml library when scala-xml became separate. But then scala.xml.pull got deprecated (in scala.xml 1.1.1) and finally removed entirely (in scala-xml 2.0.0-M1). The recommended replacement is javax.xml.stream.events.

I had some old code that used scala.xml.pull to digest my iTunes Music Library.xml and print various statistics. Recently I converted it to Scala 3, so I decided to get off the deprecated API at the same time.

So, here is the before-and-after. Perhaps this will help other users of scala.xml.pull who want to convert.

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The draft that was here has been published at: https://github.com/scala/scala/releases/tag/v2.13.3

If you notice anything in the notes that could be improved, you can still comment on this gist and I'll see it and respond.

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Collections fixes

• Fix 2.12-only bug where some toX methods could expose the underlying mutability of a ListBuffer-generated collection (#8674)

(The release includes other collections bugfixes, but this one is especially notable.)

Java interoperability

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Highlights

The main purpose of this release is to fix the following regressions in 2.12.9:

• Fix regression in large string interpolations with non-String typed splices (#8315)
• Revert "Generate shallower ASTs in pattern translation" (#8327, reverting #8061)
• Fix regression in classpath when JARs have 'a.b' entries beside 'a/b' (#8321)

Further highlights

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Fixes with compatibility implications

Scala 2.12.9 generates shallower ASTs in pattern translation, to reduce stack size requirements (-Xss) during compilation.

Scala.js users must update to 0.6.28+ or 1.0.0-M8+ for compatibility with Scala 2.12.9. (#7375)

Highlights of 2.12.9

• Improved compatibility with JDK 11, 12, and 13 (see below)

SethTisue

in Scala 2, they don't chain 😇, even if we try to give the compiler an assist

can we make them chain in Dotty? 😈

let's try it!

first let's set up sbt:

% cat project/plugins.sbt

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these notes have moved to https://github.com/scala/scala/releases/tag/v2.13.0-RC2

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The notes

the notes are now published at https://github.com/scala/scala/releases/tag/v2.13.0-RC1

Feedback?

it's not too late to improve the notes!

please send comments any of the following ways:

SethTisue

Scala 2.13 is getting closer and closer!

We've been polishing the improved and simplified Scala collections library that first shipped in 2.13.0-M4. We expect the API to remain stable now, though there may still be minor changes in RC1.

M5 is our feature-freeze release for 2.13. From here forward, we’ll close existing open loops but not embark on or accept new work.

Collections changes

The major collections changes already landed in M4. See the M4 release notes for a summary.