- Stabilized many core library APIs (e.g., I/O, collections, iterator methods) and added numerous From/Into implementations.
- Deprecated millisecond‑based timer functions, removed RUST_PATH usage, and Cargo now rejects crates with wildcard dependencies while adding a release flag to `cargo clean`.
- Fixed bugs in privacy checking, pattern matching, linting, macro error reporting, and improved Vec reservation and binary‑heap performance.
Rust 1.6.0
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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.