- Stabilized numerous APIs (e.g., VecDeque::truncate/resize, String::insert, Duration::checked_* operations, binary search by key, Result::unwrap_or_default, etc.) and added trait implementations for Result, Duration, String, and IpAddr co...
- Implemented rustc metadata-only emit (emit=metadata) and enhanced typo suggestions and resolution diagnostics, plus several compiler and std bug fixes (dead code lint for type aliases, Ctrl‑Z handling on Windows, refined panic messages).
- Breaking changes: uninhabited enums can no longer be matched with wildcard patterns and pattern matching against uninhabited types is disallowed; lifetime elision reimplemented with compatibility adjustments.
Rust 1.16.0
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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.