- Added many new stable APIs (Windows/Unix OpenOptionsExt, panic hook accessors, Weak::new, compare_exchange for atomics, extensive Unix socket types, and a new crate type `cdylib` for non‑Rust hosts).
- Enhanced Cargo with profile.panic option (abort/unwind), force flag and parallel installs, improved docs commands (cargo test doc, cargo explain, cargo doc lib/bin), and better error handling in build scripts.
- Implemented numerous library improvements: default implementations for many types, Ord for Cell/RefCell, deprecation of float abs, fallback for HashMap random seed, performance boosts in type checking, HashMap creation, and iterator find...
Rust 1.10.0
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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.