2026-04-06 — Last Week in Carbon

[josh11b]

Updates on leads issues

• Decisions
  • #6931 Update to the syntax for class members: functions, methods, fields, etc.
    • self will go in the explicit parameter list.
    • : <type> is optional on self.
    • Non-instance fields are marked with the static keyword, signifying static storage duration.
    • No change to terminology or syntax for class functions: they are implicitly marked by the absence of self, not by a static keyword.
    • 04-02 Discussed using AI to convert issue discussion into a proposal
• New issues
  • (none)
• Active discussions
  • #6932 Should we move away from `:!` syntax for generics and templates?
    • 04-02 What syntax do we want for let bindings that declare constants?
  • #6830 Should `import Cpp inline` be part of the declaration list rather than the preamble?
    • Reopened to resolve if there's a trailing semicolon.
    • Maybe this is more a delimited code block than a string literal?
    • Considering Markdown-style ``` tags.

Updates on proposals

• Decisions
  • (none)
• New RFC proposals
  • #7016 Updating `self` syntax and adding static fields
    • Implements the decision on #6931 (see above).
• Active discussions
  • (none)

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

• Conduct team updates:
  • WIP: transparency report for the past quarter in review
• Moderation interventions last week:
  • PENDING: Interviewing more TypeScript community leaders so our team can learn from their community journey, avoid common pitfalls, and possibly get inspired.
• Activity in the past week:
  • 1 new contributor! 🎉
  • 8 authors have pushed 32 commits to trunk and 36 commits to all branches.
  • On trunk, 402 files have changed and there have been 18,014 additions and 8,344 deletions
  • We merged 32 PRs, opened 9 additional PRs, closed 1 issue, and opened 1 new issue.

Activity on toolchain

• #interop Where do we put packages other than core?
• #interop 03-31 Clang AST change breaks non-type template argument interop
• 03-31 Comments when returning a new struct type
• 03-31 Do we still benefit from ASAN?
• #toolchain Help fixing #6862
• #toolchain Prioritizing where .Self.Foo impls to support C++ range for
• #toolchain Diagnostic scope constructs for attribution.
• #toolchain Custom witnesses for C++ types that implement arithmetic interfaces
  • Clang expects an expression, not a type, to do overload resolution
  • Can refactor InventClangArg to extract support for that case
• #toolchain Accessing a binding from an enclosing execution scope
• #toolchain Confusion between CoreIdentifier and CoreInterface.
• PRs:
  • temporaries in #6983 #6992
  • thunks in #6987 #6988 #6947 #7020
  • inline Cpp in #6994
  • lowering in #7001 #7008 #7009
  • runtimes in #6989
  • Update LLVM in #6998 #7011
  • where in #6995
  • debug info in #7002
  • incomplete signatures in #7004
  • C++ enum types in #7013
  • debugging in #7017 #7018 #6958
  • Destroy in #6943
  • choice in #7014
  • facets in #7005
  • in place initialization in #7021
  • const T* in #7010
  • jj in #6996 #7007
  • AI skills in #7019
  • others in #6997 #7000 #7015 #7003
• New contributors:
  • @yntfwyk made their first contribution in #7014

Activity on memory safety

• 03-30 Forward declaration of place sets within a type
• 03-31 Examples of additional expressivity in Carbon over Rust
• 04-01 What do we do for place parameters in reverse interop?

Other active discussions

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

• 03-30 Logging in Carbon
• #generics-and-templates AddWith usage and ergonomics.
• 03-31 #infra Planning to turn off ASan in our default build mode -- it's not catching enough bugs to justify the high cost.
• #infra Clang build was broken due to upstream issue. Remove ASan from the default build mode #7003 should work around it.
• #editor-integrations Updated VS Code extension published.
• #infra How to invoke pre-commit checks from jj.
• #infra How to reproduce CI failures locally.
• #infra Fetching upstream LLVM slows down builds.
• #standard-library How to represent string sizes.

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