- Added new language features such as raw mut const for union fields, combined track caller with no_mangle, and multiple bounds for associated items
- Extended libraries with specialized Iterator::eq for TrustedLen, simplified Extend for tuples, zeroed constructors for Box/Rc/Arc, and const‑stable slice rotation methods
- Improved documentation: added an “Optimizing Build Performance” chapter to the Cargo book and refined rustdoc search behavior