- Stabilized several language features (asm goto, open beginning ranges, precise capturing in traits) and updated the compiler (SSE2 required for i686, removed i586‑pc‑windows‑msvc target).
- Enhanced the standard library: anonymous pipe API, unbounded shift ops, many std::arch intrinsics safe in pure code, and a host of new const‑stable APIs (Vec::extract, split_off variants, socket setters, char checks, etc.).
- Cargo gains terminal integration via ANSI OSC sequences and an exclude‑lockfile flag; numerous compatibility breaking changes were introduced, including stricter macro parsing, hard‑error lint upgrades, and changes to Windows linking beh...
Rust 1.87.0
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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.