- Added language and library features like arbitrary auto traits in trait objects, trailing commas in assert macros, Hash for raw pointers, new From implementations for atomic types, and performance improvements by avoiding unnecessary cop...
- Enhanced Cargo with multi‑package uninstall, version‑specific install, unit‑test checking, and bundled documentation; rustdoc now prints rendering warnings on each run.
- Compatibility changes tighten type‑equality rules which may break existing code, and the AsciiExt trait is deprecated.
Rust 1.23.0
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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.