- Added language and compiler features including exclusive range patterns, zero‑byte offsets/ZST reads, C23 variadics support, field reordering on `repr(packed(1))`, spectre mitigations for MSVC, new lints, and a self‑contained linker fall...
- Stabilized many library APIs: `size_of_val`, `align_of_val`, const‑context methods, default implementations for `Rc`/`Arc`, iterator support for `Box<[T]>`, split‑at checks, and various slice/string utilities, plus increased default stac...
- Updated tooling: Cargo’s Zcheck cfg always enabled, precise update handling, permission fixes, rustdoc search and custom code class support, and several compatibility‑breaking changes such as `ReentrantLockGuard` losing `Sync` and tighte...
Rust 1.80.0
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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.