Repository navigation
Conversation
Build: - Scala 3.3.8 -> 3.9.0; javaOutputVersion 17 for Scala 3 (required since 3.8), 11 for Scala 2; drop -Yfuture-lazy-vals (3.3-only, the default since 3.8) - -Xsource:3 for Scala 2.12/2.13, so that the shared sources can use Scala 3 syntax; on 2.13, scala3-migration issues (copy/apply access of case classes with non-public constructors) are reported as warnings - scalafmt: allow postfix `*` vararg splices - openapi-codegen sbt plugin: sbt 2.0.x runs on Scala 3.8 and can't load code depending on the Scala 3.9 build of openapiCodegenCore, so the plugin is built directly from the codegen-core sources - codegen-core tests: add scala3-repl (a separate artifact since Scala 3.8) - Scala Steward: pin scala3-* to 3.9.x; remove the zio-json and zio-opentelemetry pins (only needed because they are built with Scala 3.9) - CI: SCALA_3_NEXT 3.8.3 -> 3.10.0 Sources (fixing the new warnings instead of suppressing them): - `_` -> `?` type wildcards, `A with B` -> `A & B`, `xs: _*` -> `xs*` - explicit arguments to implicit parameters passed with `using` - `var x: T = _` -> `= null` (`uninitialized` in Scala 3-only modules), `private[this]` -> `private` - `f _` -> eta-expansion / explicit lambdas - `$ref` fields and non-infix methods used as operators in backticks - explicit types of implicit vals and overrides (required with -Xsource:3) - explicit type arguments for `CustomiseInterceptors(...)` in server options and `Files.get` (scalac 2.12 with -Xsource:3 overflows the stack / fails to infer them otherwise) - pekko-http: read the remote address from the request's attributes map, as `HttpRequest.attribute` needs an implicit private to pekko-http - remove unused imports Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
pierscin
force-pushed
the
scala-3-9-migration
branch
from
October 12, 2026 12:15
6381da2 to
965d592
Compare
pierscin
marked this pull request as ready for review
October 12, 2026 13:07
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Needs scala 3.9+ - probably needs new minor version
I think the biggest gotcha is that openapiCodegenCore is compiled with sbt 2.0.x so it needs scala 3.8. sbt 2.1.x will use scala 3.9