2026-09-28 — Last Week in Carbon

[josh11b]

Updates on leads issues

• Decisions
  • (none)
• New issues
  • #7838 Allow not-immediately-expanded `expand` expressions
• Active discussions
  • (none)

Updates on proposals

• Decisions
  • (none)
• New RFC proposals
  • (none)
• Active discussions
  • (none)

Updates on moderation across our community spaces (Discord and GitHub)

• Conduct team updates:
  • none
• Moderation interventions last week:
  • none
• Activity in the past week:
  • WIP: Turning lessons from our latest online training module for mods into insights for our Carbon community
  • BLOCKED: pair review of the updated landing page mockup 
  • PARKED: Turning the project landing page mockup into a PR
  • PARKED: Public Carbon knowledge online quiz review
  • 5 authors have pushed 18 commits to trunk.
  • On trunk, 1028 files have changed and there have been 69,624 additions and 25,518 deletions
  • We merged 18 PRs, opened 22 additional PRs, closed no issue, and opened 2 new issues.

Activity on toolchain

• #contributing-help How to deep-copy an inst.
• #toolchain Autoupdate script now has flag to force build mode.
• #toolchain As of #7813, TypeType will be an unconstrained FaceType, so types are now facets, matching the language design.
• #generics-and-templates Do we still need FunctionTypeWithSelfType?
• #toolchain Want a type like SmallVector but with fixed capacity.
• #toolchain Should i32 be an IntType or a ClassType?
• 09-24 How to handle imported default values.
• #contributing-help How to get rid of DefaultValueStore.
  • For now, dropping support for _.
• #toolchain Access control and SubobjectDestroy.Op.
• PRs:
  • default values in #7810 #7800 #7837
  • type is now an empty facet type in #7813 #7819
  • default fns and final fns in #7817
  • language server in #7803 #7831
  • destructors in #7773 #7824
  • dependent initialization in templates by in #7801
  • build and developer experience in #7826 #7836 #7820 #7825
  • skill files in #7814 #7818 #7815

Activity on memory safety

• 09-24 thread safety
• 09-24 NDC memory safety talk went well
• 09-24 place parameter for RC (reference counted)
• #safety Smart pointers and deep const

Other active discussions

These include Discord Chat, GitHub Discussions, or open discussion sessions.

• #getting-started Got Carbon running on the Nintendo 64!
  • Had some trouble with pointer sizes because we do type layout in the check phase.
• #getting-started Does Base satisfy Extends(Base)?
• #infra Looking for opinions on #7812 (tests for the TextMate grammar).
• #language-questions Shorthand for multiple imports?
• #getting-started Structs and named parameters.
• #general-design Link to blog post about challenges of putting aliasing in the type system of Futhark.
• #infra run_bazelisk.py vs run_bazel.py
• #syntax Syntax and semantics of friend.
• #build-help Weird linker errors when switching build configs on MacOS.
• #syntax Spelling of multi-word keywords.
• #build-help Treesitter build is non-hermetic because of declare_symlink.

 

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