Announcing Rust 1.89.0

Author: BoxyUwU

content/Rust-1.89.0.md

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+path = "2025/08/07/Rust-1.89.0"
+title = "Announcing Rust 1.89.0"
+authors = ["The Rust Release Team"]
+aliases = ["releases/1.89.0"]
+
+[extra]
+release = true
++++
+
+The Rust team is happy to announce a new version of Rust, 1.89.0. Rust is a programming language empowering everyone to build reliable and efficient software.
+
+If you have a previous version of Rust installed via `rustup`, you can get 1.89.0 with:
+
+```console
+$ rustup update stable
+```
+
+If you don't have it already, you can [get `rustup`](https://www.rust-lang.org/install.html) from the appropriate page on our website, and check out the [detailed release notes for 1.89.0](https://doc.rust-lang.org/stable/releases.html#version-1890-2025-08-07).
+
+If you'd like to help us out by testing future releases, you might consider updating locally to use the beta channel (`rustup default beta`) or the nightly channel (`rustup default nightly`). Please [report](https://github.com/rust-lang/rust/issues/new/choose) any bugs you might come across!
+
+## What's in 1.89.0 stable
+
+### Explicitly inferred arguments to const generics
+
+Rust now supports `_` as an argument to const generic parameters, inferring the value from surrounding context:
+
+```rust
+pub fn make_bitset<const LEN: usize>() -> [bool; LEN] {
+  [false; _]
+}
+```
+
+Similar to the rules for when `_` is permitted as a type, `_` is not permitted as an argument to const generics when in a signature:
+
+```rust
+// This is not allowed
+pub fn make_bitset<const LEN: usize>() -> [bool; _] {
+  [false; LEN]
+}
+```
+
+### Mismatched lifetimes syntax lint
+
+TC/LANG to write this
+
+### More x86 target features
+
+The `target_feature` attribute now supports the `sha512`, `sm3`, `sm4`, `kl` and `widekl` target features on x86. Additionally a number of `avx512` intrinsics and target features are also supported on x86:
+
+```rust
+#[target_feature(enable = "avx512bw")]
+pub fn cool_simd_code(/* .. */) -> /* ... */ {
+    /* ... */
+}
+
+```
+
+### Platform Support
+
+- [Add new Tier-3 targets `loongarch32-unknown-none` and `loongarch32-unknown-none-softfloat`](https://github.com/rust-lang/rust/pull/142053)
+
+Refer to Rust’s [platform support page][platform_support_page] for more information on Rust’s tiered platform support.
+
+### Stabilized APIs
+
+TODO
+
+### Other changes
+
+Check out everything that changed in [Rust](https://github.com/rust-lang/rust/releases/tag/1.89.0), [Cargo](https://doc.rust-lang.org/nightly/cargo/CHANGELOG.html#cargo-189-2025-08-07), and [Clippy](https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-189).
+
+## Contributors to 1.89.0
+
+Many people came together to create Rust 1.89.0. We couldn't have done it without all of you. [Thanks!](https://thanks.rust-lang.org/rust/1.89.0/)
+
+[platform_support_page]: https://doc.rust-lang.org/rustc/platform-support.html