- Stabilized numerous language and library features, including default const arguments, destructuring assignment, asm! macros for multiple architectures, and many const‑fn APIs and iterator improvements.
- Disabled incremental compilation by default due to a frequent ICE, requiring RUSTC_FORCE_INCREMENTAL=1 to re‑enable, which may break existing builds.
- Added deprecations and compatibility lint changes such as cfg‑attr lint for crate type/name and removal of the [no link] attribute effect, with weak‑symbol refactoring that could introduce new versioned symbols.
Rust 1.59.0
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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.