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wire 2026-07-12
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$ the-wire · showcase

RUST COMPILER SHRINKS MIR, MIRI ADDS SYSCALL SHIMS

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

bors renovate JonathanBrouwer LorrensP-2158466 aerooneqq pluiee faukah
10 people shipped this
bors @bors 5 cited renovate @renovate 3 cited JonathanBrouwer @JonathanBrouwer 1 cited LorrensP-2158466 @LorrensP-2158466 1 cited aerooneqq @aerooneqq 1 cited pluiee @pluiee 1 cited faukah @faukah 1 cited WhySoBad @WhySoBad 1 cited enthropy7 @enthropy7 1 cited RalfJung @RalfJung

The compiler team landed a 14-PR rollup that cuts mir::Statement size to 40 bytes while the Miri interpreter gains critical Unix syscall coverage with gethostname, poll, and futimens support.

The biggest compiler win overnight is a memory optimization [1] that shrinks mir::Statement from 48 to 40 bytes, a meaningful reduction for anyone holding large MIR representations in memory. The same rollup included documentation fixes for AtomicU128/AtomicI128 availability [2] and improved diagnostics for const operations [1]. On the interpreter side, Miri's been filling gaps in its syscall coverage: gethostname now works across Linux/BSD/macOS with proper target-specific behavior [5], poll() syscall support landed [6] for file descriptor readiness, and File::set_times now works via futimens [7]. Two additional compiler improvements landed around resolver arena optimization [3] and delegation's Self type mapping for non-first arguments [4], both addressing known performance and ergonomic pain points. The crates.io frontend continues steady dependency updates [8], [9], [10] while the registry itself ticks forward with crate index updates [11], [12], [13], [14], [15].

Action items

References

  1. [1] Rollup of 14 pull requests ↗ rust-lang/rust
  2. [2] Include AtomicU128/AtomicI128 in docs for any target ↗ rust-lang/rust
  3. [3] Resolver: Wrap arenas in `WorkerLocal` ↗ rust-lang/rust
  4. [4] delegation: support `Self` mapping adjustments for non-first arguments ↗ rust-lang/rust
  5. [5] shims: add a shim for gethostname ↗ rust-lang/miri
  6. [6] Add `poll` shim ↗ rust-lang/miri
  7. [7] Support File::set_times via futimens shim ↗ rust-lang/miri
  8. [8] Update dependency @types/node to v24.13.3 ↗ rust-lang/crates.io
  9. [9] Update dependency pnpm to v11.11.0 ↗ rust-lang/crates.io
  10. [10] Update dependency svelte-check to v4.7.2 ↗ rust-lang/crates.io
  11. [11] Update crate `smix-sdk` rust-lang/crates.io-index ↗
  12. [12] Update crate `smix-host-coord-resolver` rust-lang/crates.io-index ↗
  13. [13] Update crate `hisi-fwpkg` rust-lang/crates.io-index ↗
  14. [14] Update crate `smix-driver` rust-lang/crates.io-index ↗
  15. [15] Update crate `smix-runner-client` rust-lang/crates.io-index ↗

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

the week in review Rust drops d32 support from 32-bit Arm targets the month in review Never type and custom allocators stabilize while rustc refactors repeat
Topics: Rust Full archive → Weekly reviews →

Quick answers

What shipped in Rust on July 12, 2026?
The compiler team landed a 14-PR rollup that cuts mir::Statement size to 40 bytes while the Miri interpreter gains critical Unix syscall coverage with gethostname, poll, and futimens support. In total, 85 commits and 25 pull requests landed.
Who contributed to Rust on July 12, 2026?
10 developers shipped this update, including bors, JonathanBrouwer, LorrensP-2158466, aerooneqq, pluiee, faukah, RalfJung, and WhySoBad, and 2 more.
What were the notable Rust updates?
Rollup of 14 pull requests, Include AtomicU128/AtomicI128 in docs for any target, and Resolver: Wrap arenas in `WorkerLocal`.
♥

$ log @rust-lang --recent

Cargo preserves locked prerelease deps, rustdoc fixes inlined intra-doc links 98 shipped Miri picks up upstream Rust, compiler narrows query stack output 152 shipped crates.io rejects publish tarballs missing target sources 193 shipped Const Range iteration, reexport chains fixed, TWiR 669 lands 119 shipped

$ log --all # elsewhere on the wire

@openclaw Cold-start Gateway diagnostics stop crying wolf, doctor repairs plugin drift Agentic Coding Cline desktop bundles shrink, goose unblocks its own clicks

$ ls showcases/

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

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