- Language updates: 'proc' is no longer a reserved keyword, the new `dyn` syntax is stable, generic parameter attributes are now stable, and a `must_use` lint is added to functions and types.
- Library enhancements: SIMD intrinsics for x86/x86_64 are stable, many core methods (e.g., for u8, f32, f64) are now available, iterator and collection APIs are expanded, generic `Rhs` defaults to `Self`, and common APIs like `Clone::clon...
- Cargo and docs: cargo metadata now includes authors/categories/keywords/readme/repository and a metadata table; new `--target-dir` option, automatic target inference with opt‑out flags, and compiler info caching; the Rustc book added to ...
Rust 1.27.0
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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.