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
• i128 and u128 in extern "C"
• in progress demotion of x86_64-macos-darwin
• spec compliant wasm32-unknown-unknown C ABI

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

[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]

@bjorn3 in regards to rust-lang/rust#133952 it seems entirely missed from this release as it was not marked relnotes. Other than that I just honestly can't figure out what has actually changed here and what it means for any users (the PR has zero description and does not change any tests). Does it need compat notes? What would we write in the blog?

Best I can understand we changed the meaning of extern "C" fn on wasm targets. But we had a bunch of lints and FCWs before we did this so its not actually breaking? Is this just "new feature: extern "C" on wasm targets is now properly supported"

It seems like it should definitely have a release notes entry though so if you'd be able to file a review adding the proper text to the relevant headers in rust-lang/rust#144509 that'd be great. (note that release is tommorow.... there isn't really that much time left)

edit: done myself but would appreciate a look over if possible

[bjorn3]

it seems entirely missed from this release as it was not marked relnotes.

Oops, should indeed have been marked relnotes.

edit: done myself but would appreciate a look over if possible

LGTM