- Const fn support expanded: generic trait bounds, impl Trait args/returns, function pointers, opaque impl Trait returns, and many offset/wrapping arithmetic methods now usable in const contexts.
- Several std APIs stabilized, including Pin::static, mutable retain for Vec/VecDeque, std::process::ExitCode & Termination, thread::available_parallelism (cgroup‑aware), and stdio lock returning 'static handles.
- Breaking changes: Cargo now avoids whole‑archive linking by default (may cause link errors), cfg predicates are always fully evaluated, and proc‑macro ident matchers no longer wrap groups.
Rust 1.61.0
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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.