- Stabilized numerous APIs (default implementations for many collection iterators, NonZero::MIN/MAX, Option::is_some, etc.) and introduced language relaxations (asm! operand ordering, const/unsafe checks in let bindings, negative literals ...
- Switched the default linker to LLD for ARM/Thumb targets, added new Cdebuginfo options, tier‑3 support for loongarch64 and i586 QNX, and inserted alignment debug assertions that may cause existing code to panic (breaking change).
- Cargo improvements: sparse protocol is now default, added CARGO_PKG_README support, and rustdoc test run directory stabilization; documentation updates for Cell layout and other items.
Rust 1.70.0
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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.