- Added several new language features: unions with mutable references, deallocation of shared references inside UnsafeCell, const‑eval support for many APIs, fmt::Write for OsString, and many new non‑zero numeric helpers.
- Extended compiler and tooling support: Nintendo Switch as a tier‑3 target, link‑flavor rust‑lld for iOS/tvOS/watchOS, cgroupv1 for parallelism, and numerous internal performance improvements; Cargo now inherits workspace settings, accept...
- Introduced breaking changes and bug fixes: soundness bug in BTreeMap fixed, transmute layout changed to Rust’s ideal layout, impl Trait misuse corrected, and various unsafe/asm restrictions tightened.
Rust 1.64.0
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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.