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wire 2026-06-27
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RUST COMPILER TIGHTENS FUNCTION ARGUMENT LIMITS, DOCS EXPAND

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

workflows-miri[bot]
1 person shipped this
workflows-miri[bot] @workflows-miri[bot] 1 cited

The Rust compiler now caps function arguments at 255 to prevent AST bloat, while the standard library gets its first comprehensive attribute documentation.

The compiler shipped a hard limit on function arguments across both splat AST and FnDecl [1], closing a vector for pathological code that could balloon memory usage during compilation. This isn't a breaking change for real code - if you're hitting 255 arguments, you have bigger architectural problems - but it hardens the compiler against adversarial inputs. In parallel, Rust's attribute documentation reached a milestone [2]: built-in attributes like `deprecated`, `warn`, `allow`, `cfg`, `deny`, and `forbid` now have proper reference docs using the `#[doc(attribute)]` mechanism, part of a larger push to make the standard library self-documenting. The compiler team also cleaned up technical debt [3] by removing stale FIXME comments and replacing slower `ilog(10)` calls with the optimized `ilog10()` variant. Miri pulled the latest upstream changes [4] to stay synchronized with the nightly compiler. On crates.io, the openipc ecosystem expanded with four new hardware-focused crates [5] [6] [7] [8], targeting embedded platforms from web to RTL88xx drivers.

Action items

References

  1. [1] Limit splat AST and FnDecl to 255 args rust-lang/rust ↗
  2. [2] Rollup merge of #158244 - kantnero:attribute-docs-deprecated-warn, r=GuillaumeGomez,traviscross rust-lang/rust ↗
  3. [3] Rollup merge of #158448 - GuillaumeGomez:cleanup-numbuffer, r=Amanieu rust-lang/rust ↗
  4. [4] Automatic Rustup ↗ rust-lang/miri
  5. [5] Create crate `openipc-web` rust-lang/crates.io-index ↗
  6. [6] Create crate `openipc-native` rust-lang/crates.io-index ↗
  7. [7] Create crate `openipc-rtl88xx` rust-lang/crates.io-index ↗
  8. [8] Create crate `openipc-core` 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 June 27, 2026?
The Rust compiler now caps function arguments at 255 to prevent AST bloat, while the standard library gets its first comprehensive attribute documentation. In total, 89 commits and 17 pull requests landed.
Who contributed to Rust on June 27, 2026?
1 developer shipped this update, including workflows-miri[bot].
What were the notable Rust updates?
Limit splat AST and FnDecl to 255 args, Rollup merge of #158244 - kantnero:attribute-docs-deprecated-warn, r=GuillaumeGomez,traviscross, and Rollup merge of #158448 - GuillaumeGomez:cleanup-numbuffer, r=Amanieu.
♥

$ 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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