- Stabilized the default allocation error handler, efiapi calling convention, and several const‑eval APIs; added a new tier‑3 target (armv7 Sony Vita) and enabled sanitizers for s390x Linux.
- Compiler changes: deny variant‑name bindings by default, parse `..` as let initializer, always check alignment, disable split‑dwarf inlining, add vendor to Fuchsia target triple, and enable ThinLTO on Windows and macOS.
- Library updates: `PathBuf` now implements `DerefMut`, `std::task::Context` becomes `!Send`/`!Sync`, O(1) Vec↔VecDeque conversion guarantee, plus bug fixes for BinaryHeap invariant and leak amplification.
Rust 1.68.0
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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.