Who contributed to Rust on August 24, 2026?

9 developers shipped this update, including renovate, Denis Cornehl, bors, flip1995, RalfJung, jhpratt, JonathanBrouwer, and Mark-Simulacrum, and 1 more.

What were the notable Rust updates?

port all variadic functions to strict signature checking, deprecate the old 'lenient' check_shim_sig, and stop using check_shim_sig_lenient for main foreign_items.

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The Wire · Showcase

MIRI CRACKS DOWN ON FLEXIBLE SHIM SIGNATURES

By RepoJournal · Filed 06:58 UTC on August 24, 2026 · About Rust

9 people shipped this

RalfJung @RalfJung 4 cited

renovate @renovate 1 cited

flip1995 @flip1995 1 cited

jhpratt @jhpratt 1 cited

Denis Cornehl @syphar

bors @bors

JonathanBrouwer @JonathanBrouwer

Mark-Simulacrum @Mark-Simulacrum

folkertdev @folkertdev

Miri is tightening the screws on foreign function shims, and the ripple is hitting rustc's soft-float ABI handling.

RalfJung is driving a hard cleanup through Miri, porting variadic functions to strict signature checking [1] and deprecating the old lenient check_shim_sig path [2], with the main foreign items dropping the lenient variant altogether [3]. This tightening comes as rustc itself picks up a guard against enabling avx2 with a soft-float ABI, a combination that "can crash the backend" [4], so now the compiler will preempt it at the rust level. Meanwhile, the Clippy subtree got a routine bump [5], and docs.rs is rolling to the rust 1.98.0 toolchain [6], so expect your next nightly to feel a little more strict on the edges. For the UEFI crowd, a rolled-up fix makes TcpStream::nodelay actually work and rejects zero timeouts, which every other backend already did [7].

Action items

→ Update any code that relied on lenient Miri shim signatures; it will break rust-lang/miri [immediate]
→ Test soft-float targets with avx2 features enabled; rustc now rejects it rust-lang/rust [monitor]
→ Review new Clippy lints after the subtree update rust-lang/rust [monitor]
→ Verify UEFI TCP code against the nodelay and timeout fixes rust-lang/rust [plan]

References

[1] port all variadic functions to strict signature checking ↗ rust-lang/miri
[2] deprecate the old 'lenient' check_shim_sig rust-lang/miri
[3] stop using check_shim_sig_lenient for main foreign_items ↗ rust-lang/miri
[4] target_features: sse (or at least avx2) is incompatible with soft-float ABI ↗ rust-lang/rust
[5] Clippy subtree update ↗ rust-lang/rust
[6] chore(deps): update rust ↗ rust-lang/docs.rs
[7] Rollup merge of #161557 - devnexen:uefi_tcp_fix, r=clarfonthey rust-lang/rust

Quick answers

What shipped in Rust on August 24, 2026?: Miri is tightening the screws on foreign function shims, and the ripple is hitting rustc's soft-float ABI handling. In total, 89 commits and 15 pull requests landed.
Who contributed to Rust on August 24, 2026?: 9 developers shipped this update, including renovate, Denis Cornehl, bors, flip1995, RalfJung, jhpratt, JonathanBrouwer, and Mark-Simulacrum, and 1 more.
What were the notable Rust updates?: port all variadic functions to strict signature checking, deprecate the old 'lenient' check_shim_sig, and stop using check_shim_sig_lenient for main foreign_items.

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