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wire 2026-08-25
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$ the-wire · showcase

The never type is stable

By RepoJournal · Filed · About Rust · Composed from the cited sources · methodology

bors RalfJung Waffle Lapkin mvolfik dybucc chengr4
6 people shipped this
bors @bors 2 cited RalfJung @RalfJung 2 cited Waffle Lapkin @WaffleLapkin 2 cited mvolfik @mvolfik 1 cited dybucc @dybucc 1 cited chengr4 @chengr4

Rust's never type just went stable, making `!` a first-class citizen that changes how fallback works on every edition.

Rust's never type `!` is now stable, and the fallback for diverging expressions is `!` on all editions, a breaking change with crater analysis behind it [1]. WaffleLapkin followed up by stripping the `dependency_on_unit_never_type_fallback` lint [2] and removing `#![feature(never_type)]` from the tools [3]. Meanwhile, Miri walked back a recent decision: custom allocators won't get `noalias` after all, pending a future `NativeAllocator` wrapper [4]. The team also merged a follow-up that unifies the signal shim macros [5]. On the libc desk, HelenOS support landed as a stable-nominated PR that the author plans to backport to libc 0.2 [6]. Elsewhere, libc is cleaning up L4Re bindings by deprecating LFS symbols and adjusting offsets [7]. The crates.io-index churned through routine crate updates, nothing alarming [8]. This period saw 109 commits and 22 PRs across the five repos.

Action items

References

  1. [1] Auto merge of #155499 - WaffleLapkin:stabilize-never-type, r=JonathanBrouwer rust-lang/rust ↗
  2. [2] remove `dependency_on_unit_never_type_fallback` lint rust-lang/rust ↗
  3. [3] remove `#![feature(never_type)]` from tools rust-lang/rust ↗
  4. [4] Custom allocators do not get noalias after all ↗ rust-lang/miri
  5. [5] unify shim_sig and shim_sig_variadic macros ↗ rust-lang/miri
  6. [6] Add HelenOS support ↗ rust-lang/libc
  7. [7] l4re: deprecate lfs bindings ↗ rust-lang/libc
  8. [8] Update crate `pamoja-security` rust-lang/crates.io-index ↗

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

the week in review rustc to stop silently dropping unknown LLVM diagnostics the month in review Rust 1.99.0 lands with new raw-borrow lint
Full archive → Weekly reviews →

Quick answers

What shipped in Rust on August 25, 2026?
Rust's never type just went stable, making `!` a first-class citizen that changes how fallback works on every edition. In total, 109 commits and 22 pull requests landed.
Who contributed to Rust on August 25, 2026?
6 developers shipped this update, including bors, RalfJung, Waffle Lapkin, mvolfik, dybucc, and chengr4.
What were the notable Rust updates?
Auto merge of #155499 - WaffleLapkin:stabilize-never-type, r=JonathanBrouwer, remove `dependency_on_unit_never_type_fallback` lint, and remove `#![feature(never_type)]` from tools.
♥

$ log @rust-lang --recent

docs.rs gets a lockfile refresh, rust-analyzer learns E0220 112 shipped Crates.io closes a crate-scope bypass 184 shipped Array drops fixed in order after partial moves 115 shipped rustup reworks directory overrides to match by identity, not canonical path 83 shipped

$ log --all # elsewhere on the wire

Agent Security Quiet day in agent security as guard coverage reaches four clients Alignment & Post-training verl defaults Ascend RL mode, open-instruct unblocks SFT packing

$ ls showcases/

Safety Evals AI Red Teaming Agent Security Interpretability Alignment & Post-training

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