- Added new language capabilities: deriving built‑in traits on packed structs with Copy fields, stabilized the cmpxchg16b target feature, improved trait‑bound analysis, allowed associated types as union fields, and treated `str` as a `[u8]...
- Stabilized numerous const APIs (e.g., CStr::from_bytes_until_nul, various SocketAddr constructors) and expanded library support with DispatchFromDyn for cell types and AsFd/AsRawFd for Rc; Cargo now suggests `cargo fix`/`cargo clippy fix...
- Introduced breaking compatibility changes: unaligned references to packed fields are now hard errors, default `repr(C)` enums now use C `int` size, and the minimum external LLVM version is bumped to 14, alongside several internal perform...
Rust 1.69.0
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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.