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wire 2026-09-06
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$ the-wire · showcase

Closures become MaybeDangling, AArch64 SVE lands in inline asm

By RepoJournal · Filed · About Rust

tgross35 bors JonathanBrouwer RalfJung CrooseGit WhySoBad newpavlov
7 people shipped this
tgross35 @tgross35 3 cited bors @bors 1 cited JonathanBrouwer @JonathanBrouwer 1 cited RalfJung @RalfJung 1 cited CrooseGit @CrooseGit 1 cited WhySoBad @WhySoBad 1 cited newpavlov @newpavlov 1 cited

Rust's aliasing model will now ignore references and Boxes captured by closures, and inline assembly gains AArch64 SVE support.

Rust nightly merges a rollup that adds a Tier-3 target `powerpc64-sony-ps3` and other changes [1]. More consequentially, a new PR makes closures (and coroutines) act like MaybeDangling, so the aliasing model "will entirely ignore references and `Box`es passed around as closure captures" [2]. This removes a subtle footgun that has caused multiple soundness issues, including in the standard library's thread spawning logic.

Inline assembly now supports AArch64 SVE registers [3], which enables hand-written SVE code inside `asm!` blocks on AArch64 targets. Miri also gained the last unsupported AES intrinsic, `llvm.x86.aesni.aeskeygenassist`, completing support for the `aes` target feature [4], and fixed a TCP readiness bug that previously caused a global deadlock in a newly added test [5].

In libc, `tmpnam` and `tempnam` are now deprecated on Unix platforms where they exist because they are TOCTOU-prone and not thread-safe; glibc docs say "Never use this function" [6]. Socket constants continue moving to `src/new` for glibc, which fixes a ctest failure involving `__socket_type` [7], and the `c_enum!` macro now supports field attributes [8].

The crates.io index saw routine crate updates and one new crate, `mailtea` [9].

Action items

References

  1. [1] Rollup of 25 pull requests ↗ rust-lang/rust
  2. [2] make closures act like MaybeDangling ↗ rust-lang/rust
  3. [3] Adds support for AArch64 SVE to inline assembly ↗ rust-lang/rust
  4. [4] Add `llvm.x86.aesni.aeskeygenassist` support ↗ rust-lang/miri
  5. [5] Manually set initial TCP socket readiness ↗ rust-lang/miri
  6. [6] unix: Deprecate the POSIX-obsoleted `tmpnam`, `tempnam` ↗ rust-lang/libc
  7. [7] glibc: Move more socket constants to `src/new` ↗ rust-lang/libc
  8. [8] macros: Support field attributes in `c_enum!` ↗ rust-lang/libc
  9. [9] Create crate `mailtea` ↗ rust-lang/crates.io-index

$ ls rust-lang/reviews/ # the step-back reads

the week in review Closures become MaybeDangling, AArch64 SVE lands the month in review Never type and custom allocators stabilize while rustc refactors repeat
Topics: Rust Full archive →

Quick answers

What shipped in Rust on September 6, 2026?
Rust's aliasing model will now ignore references and Boxes captured by closures, and inline assembly gains AArch64 SVE support. In total, 94 commits and 29 pull requests landed.
Who contributed to Rust on September 6, 2026?
7 developers shipped this update, including bors, tgross35, JonathanBrouwer, RalfJung, CrooseGit, WhySoBad, and newpavlov.
What were the notable Rust updates?
Rollup of 25 pull requests, make closures act like MaybeDangling, and Adds support for AArch64 SVE to inline assembly.
♥

$ log @rust-lang --recent

libc hardens config, rust-analyzer ships 2026-09-07 107 shipped rustup adds --check flag and toolchain pin, libc gains path constants 86 shipped Rust fixes time-traveling UB, rolls back enum Debug change 188 shipped compiler-builtins adds wcslen for LLVM 23, crates.io streamlines owner handling 86 shipped

$ log --all # elsewhere on the wire

Meta React Native adds Stable API guards to renderer attributed string FastAPI & Pydantic Pydantic fixes Mypy plugin crash, tightens datetime constraints

$ ls showcases/

Rails Django Laravel Node.js Go Vercel Vue.js Kubernetes HashiCorp Arch Linux Linux Anthropic

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