- Stabilized new const capabilities (e.g., &mut in const, raw lifetimes, references to statics) and added many tier‑3 compilation targets while deprecating the unsound Csoft float flag.
- Extended Cargo with CARGO_MANIFEST_PATH and package.autolib options, and improved Rustdoc sidebar TOC and documentation (ptr::add/sub, missing‑docs lint).
- Fixed several compiler issues: soundness bug in higher‑ranked lifetimes, macOS linking deployment‑target handling, dropped VS2013 support, and updated LLVM minimum version.
Rust 1.83.0
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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.