- Added numerous stable APIs (Box conversions, raw Arc/Rc pointers, Ordering::then, BTreeMap range, Cell enhancements, etc.) and new language features like struct field shorthand and allowing Self in impl where‑clauses
- Introduced breaking soundness changes: unsized coercions now require equal lifetimes, early‑bound lifetimes fix, hard error for transmuting fn items to pointer‑sized types, and format! now panics on formatting errors
- Improved security and stability: adaptive HashMap resizing to mitigate DOS attacks, optional C overflow checks, many bug‑fixes and ICE resolutions, plus updates to Cargo commands and documentation tooling
Rust 1.17.0
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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.