Rust 1.84: what's new, what was stabilized

Language features stabilized

• Stabilize s390x inline assembly
• Stabilize Arm64EC inline assembly

40 APIs stabilized

Ipv6Addr::is_unique_local, Ipv6Addr::is_unicast_link_local, core::ptr::with_exposed_provenance, core::ptr::with_exposed_provenance_mut, <ptr>::addr, <ptr>::expose_provenance, <ptr>::with_addr, <ptr>::map_addr, <int>::isqrt, <int>::checked_isqrt, <uint>::isqrt, NonZero::isqrt, core::ptr::without_provenance, core::ptr::without_provenance_mut, core::ptr::dangling, core::ptr::dangling_mut, Pin::as_deref_mut, AtomicBool::from_ptr, AtomicPtr::from_ptr, AtomicU8::from_ptr, AtomicU16::from_ptr, AtomicU32::from_ptr, AtomicU64::from_ptr, AtomicUsize::from_ptr, AtomicI8::from_ptr, AtomicI16::from_ptr, AtomicI32::from_ptr, AtomicI64::from_ptr, AtomicIsize::from_ptr, <ptr>::is_null, <ptr>::as_ref, <ptr>::as_mut, Pin::new, Pin::new_unchecked, Pin::get_ref, Pin::into_ref, Pin::get_mut, Pin::get_unchecked_mut, Pin::static_ref, Pin::static_mut

Can it break my build?

The release lists these compatibility notes. Most only affect rare code, but read them before you raise your toolchain in CI:

Use it

rustup update stable        # get the newest release
rustup install 1.84          # or exactly this one
rustup override set 1.84     # pin a project to it

To require at least this version from users of your crate, set rust-version = "1.84" under [package] in Cargo.toml. Cargo then refuses to build it on older compilers with a clear message, and with resolver 3 (the default on the 2024 edition, Rust 1.85+) it also prefers dependency versions that support it.

Full release notes

Release notes from the Rust project's RELEASES.md (MIT or Apache-2.0); summaries above are ours.

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