- Stabilized upcasting trait objects, double‑negation lint, pointer non‑null debug asserts, and many const‑compatible APIs.
- Added numerous Tier‑3 platform targets (e.g., aarch64‑unknown‑qnx, win7, amdgcn, bare‑metal, NuttX) and sped up the AArch64 Linux compiler with ThinLTO + PGO.
- Library and Cargo updates: FromBytesWithNulError now an enum, removed RustcDecodable/Encodable, deprecated libtest logfile and cargo login token, and made missing‑package errors fatal; introduced hard errors for wasm ABI and enum‑drop ca...
Rust 1.86.0
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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.