Announce Rust 1.89.0

[BoxyUwU]

• Explicitly Inferred Arguments to Const Generics
• Mismatched Lifetime Syntax Lint
• More x86 Target Features and Intrinsics
• Cross compiled doctests

cc @rust-lang/release
@rustbot ping relnotes-interest-group

Rendered

[rustbot]

Hi relnotes-interest-group, this PR adds a release blog post. Could you review
the blog post if you have time? Thanks <3

cc @alex-semenyuk @jieyouxu @joshtriplett @Kobzol @lcnr @traviscross

[shepmaster]

We're playing a little fast and loose with the timing of this announcement, but the "worst" case is that we extend support one more release, which people are unlikely to be unhappy about.

Suggested change

	### Demoting `x86_64-apple-darwin` to Tier 2 with host tools
	GitHub will soon [discontinue][gha-sunset] providing free macOS x86\_64 runners for public repositories. Apple has also announced their [plans][apple] for discontinuing support for the x86\_86 architecture.
	In accordance with these changes, the Rust project is in the [process of demoting the `x86_64-apple-darwin` target][rfc] from Tier 1 to Tier 2 with host tools. This means that the target, including tools like `rustc` and `cargo`, will be guaranteed to build but is not guaranteed to pass our automated test suite.
	We expect that the RFC for the demotion to Tier 2 with host tools will be accepted between the releases of Rust 1.89 and 1.90, which means that Rust 1.89 will be the last release of Rust where x86\_64 macOS is a Tier 1 target.
	For users, nothing will change. Builds of both the standard library and the compiler will still be distributed by the Rust Project for use via `rustup` or alternative installation methods.
	[apple]: https://en.wikipedia.org/wiki/Mac_transition_to_Apple_silicon#Timeline
	[gha-sunset]: https://github.blog/changelog/2025-07-11-upcoming-changes-to-macos-hosted-runners-macos-latest-migration-and-xcode-support-policy-updates/#macos-13-is-closing-down
	[rfc]: https://github.com/rust-lang/rfcs/pull/3841

[jieyouxu]

Maybe s/x86_64 macOS/x86_64-apple-darwin/.

[bjorn3]

Something that may be of note is that 1.89 finally fixes the C abi for wasm32-unknown-unknown: rust-lang/rust#133952

[BoxyUwU]

cc @rust-lang/cargo