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wire 2026-09-10
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i686 Windows host tools retired, DiagCtxt API narrowed

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

bors Jacob Pratt syphar Eric Seppanen Jonathan Brouwer Mateusz Mikuła bdillo
9 people shipped this
bors @bors 6 cited Jacob Pratt @jhpratt 2 cited syphar @syphar 2 cited Eric Seppanen @ericseppanen 2 cited Jonathan Brouwer @JonathanBrouwer 1 cited Mateusz Mikuła @mati865 1 cited bdillo @bdillo 1 cited U007D @U007D 1 cited Alex @RPG-Alex 1 cited

Rust dropped host tools from the i686-pc-windows-msvc target, implementing RFC 3999, while a compiler cleanup minimized the DiagCtxt family of types and generalized most `Box` trait impls.

The i686-pc-windows-msvc target no longer ships host tools, landing via auto merge [1] as the implementation of RFC 3999 and closing the tracking issue tied to it. Mateusz Mikuła's change also collapsed two CI test jobs into one, since the second no longer ran any tests [2]. Anyone building cross or host tooling for 32-bit MSVC Windows should treat that triplet as a cross-target only.

In the compiler internals, nnethercote's refactor establishes a clearer placement rule for diagnostics: methods should not go on `DiagCtxt` whenever possible [3]. The cleanup lets `impl Deref for DiagCtxtHandle` be removed, along with its non-standard double-reference `&&'a DiagCtxt` return. Separately, a rollup generalized most trait impls on `Box` [4]; `Default` was left alone because changing it would be breaking, and awkward cases like `Clone for Box<Path>` were also untouched.

Smaller but adjacent: a rollup removed the explicit `OnDuplicate::Error` specification since it is already the default [5]. On docs.rs, `build_limits` now uses `Default::default` for its default values and renames `::new` to `::from_config` to make the call site explicit, pulled out of the larger build-limits work [6][7].

This Week in Rust published issue 668 [8], preceded by the usual sections update for CFT, FCP, MCP, and RFC listings [9]. A cleanup removed submissions that had been accidentally merged into the draft template [10][11], and a Gloo plus Yew link for persistent webapp state was added for an upcoming issue [12]. The crates.io index took five `tatara-*` crate updates in the same window [13][14][15][16][17].

Action items

References

  1. [1] Auto merge of #162288 - mati865:i686-msvc-no-host, r=jieyouxu ↗ rust-lang/rust
  2. [2] Drop host tools from i686-pc-windows-msvc ↗ rust-lang/rust
  3. [3] Rollup merge of #162453 - nnethercote:min-DiagCtxt-methods, r=oli-obk ↗ rust-lang/rust
  4. [4] Rollup merge of #161946 - nia-e:more-box-impls, r=clarfonthey ↗ rust-lang/rust
  5. [5] Rollup merge of #162521 - JonathanBrouwer:remove-default, r=khyperia ↗ rust-lang/rust
  6. [6] build_limits: Default::default for defaults, rename `new` to `from_config` ↗ rust-lang/docs.rs
  7. [7] build_limits: Default::default for defaults, rename `new` to `from_config` ↗ rust-lang/docs.rs
  8. [8] Publishing 668 ↗ rust-lang/this-week-in-rust
  9. [9] Update CFT, FCP, MCP and RFC sections for TWiR-668 ↗ rust-lang/this-week-in-rust
  10. [10] remove submissions that were accidentally merged into the draft template ↗ rust-lang/this-week-in-rust
  11. [11] Merge pull request #8733 from rust-lang/fix_draft_template ↗ rust-lang/this-week-in-rust
  12. [12] Add Gloo + Yew for persistent webapp state link ↗ rust-lang/this-week-in-rust
  13. [13] Update crate `tatara-os` ↗ rust-lang/crates.io-index
  14. [14] Update crate `tatara-pkgs` ↗ rust-lang/crates.io-index
  15. [15] Update crate `tatara-ui` ↗ rust-lang/crates.io-index
  16. [16] Update crate `tatara-eval` ↗ rust-lang/crates.io-index
  17. [17] Update crate `tatara-nix` ↗ 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 September 10, 2026?
Rust dropped host tools from the i686-pc-windows-msvc target, implementing RFC 3999, while a compiler cleanup minimized the DiagCtxt family of types and generalized most `Box` trait impls. In total, 103 commits and 19 pull requests landed.
Who contributed to Rust on September 10, 2026?
9 developers shipped this update, including bors, Jonathan Brouwer, Jacob Pratt, Mateusz Mikuła, syphar, bdillo, U007D, and Eric Seppanen, and 1 more.
What were the notable Rust updates?
Auto merge of #162288 - mati865:i686-msvc-no-host, r=jieyouxu, Drop host tools from i686-pc-windows-msvc, and Rollup merge of #162453 - nnethercote:min-DiagCtxt-methods, r=oli-obk.
♥

$ 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

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