- - Added several new language features (let‑chains, naked functions, cfg boolean literals) and stabilized many const APIs and slice iteration methods.
- - Introduced breaking changes: the #[bench] attribute is now a hard error, vector types with non‑Rust ABI require the proper target feature, and i686‑pc‑windows‑gnu is demoted to Tier 2.
- - Added safety‑focused lints (invalid null arguments, dangerous implicit autorefs), fixed borrow‑checker permissiveness, and deprecated the libtest "nocapture" flag in favor of "no_capture".
Rust 1.88.0
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Language: allow shortening lifetimes of &mut during unsize coercions and introduce new lints for invalid runtime symbols and c void return types.