- Documentation overhaul: the Rust Guide and many library docs were rewritten, Cargo was enhanced, and Rust now runs on 64‑bit Windows.
- New language features added, including lifetime elision, where clauses, the move keyword, unboxed closures, indexing traits, slicing syntax, if‑let, generic bounds, the Sized trait, and tuple indexing (mostly behind feature gates).
- Breaking and deprecation changes: the crate‑id attribute and old @GC type were removed, crate‑import/use renaming syntax changed, the url crate was deprecated, and the runtime I/O layer was eliminated.
Rust 0.12.0
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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.