- Added language improvements such as static references for literals, relaxed path syntax, parallel LLVM translation, automatic Clone impls for arrays/tuples, AsRawFd for stdio, and From implementations for Rc/Arc.
- Enhanced Cargo with multi‑package install, virtual workspace propagation, a new [patch] section, gitignore‑style include/exclude patterns, an all‑targets option, and a deprecation warning for required‑dependency features.
- Updated documentation and tooling: rustdoc book released, RLS preview via rustup, consolidated std::os docs for Unix/Linux/Windows, and cargo docs moved; also introduced breaking changes in higher‑ranked type matching and rustc JSON erro...
Rust 1.21.0
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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.