- Object lifetime defaults are now enabled, causing breaking changes in trait object lifetimes, drop‑check rules, and size/align handling for dynamically sized types.
- The Duration type and std::time module are stabilized, and new library features such as CString/CStr trait impls, std::io::Error inner‑error accessors, process::Child::id, and numerous performance improvements (search algorithms, SipHash...
- The Rustonomicon is introduced as official documentation, and the slice `connect` method is deprecated in favor of the stable `join` method.
Rust 1.3.0
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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.