- Added async fn implementation in traits, hardened NaN pattern matching as a hard error, and introduced several new lints with stricter defaults (e.g., INVALID DOC ATTRIBUTES denied by default).
- Expanded platform support with new tier‑1, tier‑2, and tier‑3 targets (Windows 10+, multiple wasm, arm64ec, loongarch64, etc.), upgraded to LLVM 18, and improved rustc performance via 1CGU builds.
- Stabilized many std and Cargo APIs (e.g., Read for &Stdin, const Barrier::new, lockfile v4, respect rust-version in lockfiles) and updated libraries (Unicode 15.1, unwind‑safe Condvar, ASCII fast‑path for char::is).
Rust 1.78.0
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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.