- Stabilized numerous APIs (AtomicPtr fetch ops, strict integer ops, PathBuf extensions, Duration::from_mins/hours, const‑context methods) and added new diagnostics/linters (dangling pointer, integer‑to‑ptr transmutes, semicolon‑in‑macro d...
- Promoted aarch64/Windows platforms to higher tiers, made the Cargo build directory configurable (build.build) with host‑tuple target flag, and changed crate publishing to exclude intermediate build artifacts by default.
- Introduced breaking changes: semicolon‑in‑macro lint is now a hard error, invalid attribute syntax and trait‑impl modifiers are rejected, static closures are disallowed, and other attribute‑related compatibility checks are stricter.
Rust 1.91.0
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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.