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Add the release-notes PRs, in sections #739

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24 changes: 19 additions & 5 deletions releases/2.13.4.md
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Expand Up @@ -8,21 +8,35 @@ Scala 2.13.4 has:
* bugfixes and more

### Behavior changes
### Bugfixes
### Language changes
### Warnings and linting
### Other changes
* "Revert ExecutionContext.global to not be a BatchingExecutor" https://github.com/scala/scala/pull/9270
* "Introduce ExecutionContext.opportunistic for use in apps" https://github.com/scala/scala/pull/9296
* "Enable range positions (`-Yrangepos`) by default" https://github.com/scala/scala/pull/9146
### Features and Improvements
* "Add the Tasty Reader" https://github.com/scala/scala/pull/9109 (behind `-Ytasty-reader` <https://github.com/scala/scala/pull/9293>)
* "Check exhaustivity of pattern matches with "if" guards and custom extractors (by default) and of unsealed types (by opt-in)" https://github.com/scala/scala/pull/9140 (default switch <https://github.com/scala/scala/pull/9299>)
* "Treat private as "effectively sealed"" https://github.com/scala/scala/pull/9211
### Compiler fixes
### Deprecations
* "Make the CharSequence wrappers in Predef non-implicit, for JDK 15" https://github.com/scala/scala/pull/9292
* "Fix back-quoted constructor params with identical prefixes" https://github.com/scala/scala/pull/9008
### Standard Library changes
* "Make LazyList.cons.apply lazier" https://github.com/scala/scala/pull/9095
* "Make MapView#values return a View" https://github.com/scala/scala/pull/9090
* "Make ListBuffer's iterator fail-fast" https://github.com/scala/scala/pull/9174
### Warnings and linting
* "Display warning on equals comparing non-references" https://github.com/scala/scala/pull/8120
### Improvements from the future
* "Deprecate empty-paren (nilary) prefix unary operator" https://github.com/scala/scala/pull/9085
### Other fixes and improvements
* "Allow using classOf with object type" https://github.com/scala/scala/pull/9279

## 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.

Guaranteeing forwards and backwards binary compatibility implies we can't accept additions to the standard library (only modifications to existing code). However we've created the [scala-library-next](https://github.com/scala/scala-library-next) project as a library that will start to contain code that will be added to a future version of the Scala standard library.

## 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.
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