- Unions now support Drop and ManuallyDrop fields, uninhabited enums can be cast to integers, and patterns can bind by reference or move, improving low‑level ergonomics.
- Expanded tiered platform support (aarch64 Linux/macOS/Windows, mipsel), raised minimum LLVM to 9, and added Cargo enhancements: reproducible packaging, proc‑macro crate marking, CARGO_PRIMARY_PACKAGE env variable, and glob patterns for p...
- Stabilized slice::select_nth APIs, made Poll::is_ready and Poll::is_pending const, improved RangeInclusive checks, refined ToString buffer handling, and various internal compiler performance upgrades.
Rust 1.49.0
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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.