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RUST 1.97.0 SHIPS WITH CONST GENERICS PROGRESS AND POLONIUS FIXES
By RepoJournal · Filed · About Rust
The language team stabilized new target features and fixed critical borrowck regressions while rust-analyzer cuts LSP overhead with gen-lsp-types v0.10.0.
Rust 1.97.0 landed overnight with stabilized target features (div32, lam-bh, lamcas, ld-seq-sa, scq) and new linting for unused pub items in binaries [1]. The release includes a critical fix for polonius legacy mode that was panicking during loan invalidation [3], and borrowck improvements that clean up internal constraint handling [4]. On the const generics front, min_generic_const_args now falls back to anonymous consts when direct representation fails, pushing forward on the Project Const Generics roadmap [5]. Meanwhile, rust-analyzer bumped gen-lsp-types to v0.10.0 [2], delivering measurable ergonomic wins for `LspRequestMethod` and reduced allocations across the board. The team also cleaned internal query machinery by removing unused `cycle_{fn,initial}` support from `#[query_group]` [7], and a performance pass on the dependency graph reader deduplication should improve incremental rebuild times for larger tasks [6].
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Action items
- → Upgrade to Rust 1.97.0 if you use polonius legacy mode or hit borrowck regressions rust-lang/rust [immediate]
- → Update rust-analyzer to pick up gen-lsp-types v0.10.0 for better LSP performance rust-lang/rust-analyzer [plan]
- → Review new dead_code_pub_in_binary lint for unused exports in your binaries rust-lang/rust [monitor]
References
- [1] Rust 1.97.0 ↗ rust-lang/rust
- [2] Bump gen-lsp-types to v0.10.0 ↗ rust-lang/rust-analyzer
- [3] Rollup merge of #158384 - KiChjang:allow-backward-incompat-drop-hint, r=lqd rust-lang/rust
- [4] Rollup merge of #158877 - Enselic:adjust-best_blame_constraint, r=fee1-dead rust-lang/rust
- [5] Rollup merge of #158617 - khyperia:gca-syntax-flip, r=BoxyUwU rust-lang/rust
- [6] Auto merge of #158794 - xmakro:perf/read-dedup-epoch-filter, r=cjgillot rust-lang/rust
- [7] internal: remove `cycle_{fn,initial}` support from `#[query_group]` rust-lang/rust-analyzer