- Added numerous language conveniences such as integer literal suffix inference, per‑item warning control, compact closure syntax, “do” expressions, extended wildcard patterns, and new syntax extensions (\line, \col, \file, etc.).
- Reworked borrow checking with region‑based liveness and region pointers, introducing destructors, type‑parameterized classes, and improved type‑reflection support.
- Expanded the standard library with slices, fixed‑size vectors, atomic Arc, parallel map/search utilities, libuv integration, and Cargo‑driven automatic dependency resolution.
Rust 0.3
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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.