# Scala 3.9.0-RC2

- Product: Scala (https://whatsnew.fyi/product/scala)
- Vendor: Scala Center
- Date: 2026-07-23
- Version: 3.9.0-RC2
- Original notes: https://github.com/scala/scala3/releases/tag/3.9.0-RC2
- Permalink: https://whatsnew.fyi/product/scala/releases/3.9.0-rc2
- Labels: Pre-release

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

---

- **changed** — Upgrade to Scala.js 1.22.0
- **changed** — Stop using custom fonts for Scaladoc
- **changed** — Bump Scala CLI to 1.15.0 and coursier to 2.1.25-M26
- **changed** — Vendor REPL dependencies
- **deprecated** — Deprecate JPath use in Quotes
- **changed** — Migrate Scala CLI's using directive parser to a compiler module
- **changed** — Refactor directives-parser
- **changed** — Improve using directives parser
- **fixed** — Fix Scaladoc snippets Show all lines and Scastie popup theme bugs
- **fixed** — Do not warn on dollars in Java names
- **fixed** — Don't skip generic signature for constructors with generic using parameters
- **fixed** — Don't eliminate var used by anonfun
- **fixed** — Erase more aliases of Unit as result type to void
- **fixed** — Reset dirty unimported state after findRef
- **fixed** — Fix :help regressions
- **fixed** — Fix generic signature of trait val setter
- **fixed** — Preserve apply result type after beta reducing through opaque proxies
- **fixed** — Fix memberType for constructor params
- **fixed** — Fix match-alias subtyping and wildcard appliedTo

#### Backported chnages

- Upgrade to Scala.js 1.22.0. [#26389](https://github.com/scala/scala3/pull/26389)
- Stop using custom fonts for Scaladoc [#26393](https://github.com/scala/scala3/pull/26393)
- Bump Scala CLI to 1.15.0 (was 1.14.0) and `coursier` to 2.1.25-M26 (was 2.1.25-M25) [#26432](https://github.com/scala/scala3/pull/26432)
- Vendor REPL dependencies [#26433](https://github.com/scala/scala3/pull/26433)
- Deprecate JPath use in Quotes [#26446](https://github.com/scala/scala3/pull/26446)
- Migrate Scala CLI's using directive parser to a compiler module [#26449](https://github.com/scala/scala3/pull/26449)
- Refactor `directives-parser` [#26461](https://github.com/scala/scala3/pull/26461)
- Minor using directives parser improvements [#26460](https://github.com/scala/scala3/pull/26460)
- Scaladoc snippets: fix Show all lines & Scastie popup theme bugs [#26165](https://github.com/scala/scala3/pull/26165)
- Do not warn on dollars in Java names [#26303](https://github.com/scala/scala3/pull/26303)
- Don't skip generic signature for constructors with generic `using` parameters [#26302](https://github.com/scala/scala3/pull/26302)
- Don't eliminate var used by anonfun [#26360](https://github.com/scala/scala3/pull/26360)
- Erase more aliases of Unit as result type to void. [#26252](https://github.com/scala/scala3/pull/26252)
- Reset dirty unimported state after findRef [#26412](https://github.com/scala/scala3/pull/26412)
- Fix :help regressions [#26301](https://github.com/scala/scala3/pull/26301)
- Fix generic signature of trait val setter [#26374](https://github.com/scala/scala3/pull/26374)
- Fixes #25754: Preserve apply result type after beta reducing through opaque proxies [#25988](https://github.com/scala/scala3/pull/25988)
- Fix memberType for constructor params [#25669](https://github.com/scala/scala3/pull/25669)
- Fix #25866: match-alias subtyping and wildcard appliedTo [#25981](https://github.com/scala/scala3/pull/25981)

#### Contributors

Thank you to all the contributors who made this release possible 🎉

According to `git shortlog -sn --no-merges 3.9.0-RC1..3.9.0-RC2` these are:

```
    10	Solal Pirelli
     7	Wojciech Mazur
     6	Piotr Chabelski
     3	Sébastien Doeraene
     1	Jamie Thompson
     1	Oliver Bračevac
     1	Oron Port
     1	Som Snytt
     1	Zieliński Patryk

```