3.4.0 & 3.4.1-RC1 Release procedure

[Kordyjan]

Switch development from 3.4.1 to 3.4.2

• Create branch release-3.4.1 from main
• On main in Build.scala: Set baseVersion to 3.4.2:
  • Set version developed on main as 3.4.2 #19683

Publish 3.4.0 artifacts to Maven Central via CI:

• On release-3.4.0 branch:
  • In Build.scala: Set baseVersion to 3.4.0
  • In Build.scala: Set previousDottyVersion to 3.3.1
  • Set the TASTy version to 28.4-0
  • In changelogs add file with a changelog
• Tag the branch as 3.4.0
• Build

Set bootstrapping for future versions on main:

• In Build.scala: Set previousDottyVersion to 3.4.0
• In Build.scala: Set referenceVersion to 3.4.0
• Check and update project/MiMaFilters.scala

Publish 3.4.1-RC1 artifacts to Maven Central via CI:

• On release-3.4.1 branch
  • In Build.scala: Set previousDottyVersion to 3.4.0
  • In Build.scala: Set referenceVersion to 3.4.0
  • In Build.scala: Set baseVersion to 3.4.1-RC1
  • Check and update project/MiMaFilters.scala
  • In changelogs add file with a changelog
• Tag the branch as 3.4.1-RC1
• Build

Set bootstrapping for future versions version on main:

• In Build.scala: Set previousDottyVersion to 3.4.0
• In Build.scala: Set referenceVersion to 3.4.1-RC1:
  • Set reference version to 3.4.1-RC1 #19829
• Check and update project/MiMaFilters.scala

Confirm that the tooling is working correctly:

• Metals (@tgodzik):
  • 3.4.0
  • 3.4.1-RC1
• Scala CLI:
  • 3.4.0
  • 3.4.1-RC1
• Scala Native (@WojciechMazur):
  • 3.4.0
  • 3.4.1-RC1
• Scastie:
  • 3.4.0
  • 3.4.1-RC1
• Scala DAP (@adpi2):
  • 3.4.0
  • 3.4.1-RC1

Update the ecosystem:

• Release 3.4.0 to SDKMAN
• Update the templates and examples projects:
  • scala3-mill-example-project:
    • Update Scala to 3.4.0 scala3-mill-example-project#22
  • scala3-cross.g8
    • Update Scala to 3.4.0 scala3-cross.g8#99
  • scala3-staging.g8
    • Update Scala to 3.4.0 scala3-staging.g8#45
  • scala3-tasty-inspector.g8
    • Update Scala to 3.4.0 scala3-tasty-inspector.g8#40
  • scala3.g8
    • Update Scala to 3.4.0 scala3.g8#136

Prepare the documentation:

• Merge release-3.4.0 into language-reference-stable
• Publish API docs for 3.4.0
• Add 3.4.0 to the version list in API docs
• Update docs.scala-lang

Announce the releases:

• Make both GitHub releases public
• Publish a post on https://scala-lang.org/blog
• Open the 3.4.1 tracking thread on https://contributors.scala-lang.org
• Close the 3.4.0 milestone
• Make sure all PRs merged and issues fixed in 3.4.1 are in the 3.4.1 milestone