- Const functions now support if/match/loop, slice coercion, and added const fn utilities like mem::forget.
- New library features include track_caller attribute, tuple indexing without parentheses, expanded trait implementations (e.g., vec::IntoIter AsRef<[T]>, Option::zip), and integer leading/trailing ones methods.
- Breaking changes: abi blacklist renamed to unsupported_abis, stricter checks on C‑like enums with Drop, disallowed repr(i128/u128) on structs, overlapping trait impl restrictions, and macro_rules token capture changes.
Rust 1.46.0
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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.