- Language: abort on uncaught panics in extern "C" functions, stricter pointer-to-trait casts, and new lint handling for [expect]; libraries gain faster slice::sort/select_nth and split PanicInfo types (std::panic::PanicHookInfo).
- Security/bugfix: Fixed CVE‑2024‑43402 in Command batch file escaping; Cargo now validates package.license and package.readme paths and disallows mismatched release/debug flags.
- Breaking/deprecation: wasm32‑wasi target now emits a warning and will be removed in 2025; std::panic::PanicInfo renamed to PanicHookInfo with deprecation warning; removal of lib.plugin support.
Rust 1.81.0
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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.