1.93.0 announcement

content/Rust-1.93.0.md

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+path = "2026/01/22/Rust-1.93.0"
+title = "Announcing Rust 1.93.0"
+authors = ["The Rust Release Team"]
+aliases = ["releases/1.93.0"]
+
+[extra]
+release = true
++++
+
+The Rust team is happy to announce a new version of Rust, 1.93.0. 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 1.93.0 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 1.93.0](https://doc.rust-lang.org/stable/releases.html#version-1930-2026-01-22).
+
+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 1.93.0 stable
+
+### Update bundled musl to 1.2.5
+
+The various `*-linux-musl` targets now all [ship](https://github.com/rust-lang/rust/pull/142682) with musl 1.2.5. This primarily affects static musl builds for `x86_64`, `aarch64`, and `powerpc64le` which bundled musl 1.2.3. This update comes with [several fixes and improvements](https://musl.libc.org/releases.html), and a breaking change that affects the Rust ecosystem.
+
+For the Rust ecosystem, the primary motivation for this update is to receive major improvements to
+musl's DNS resolver which shipped in 1.2.4 and received bug fixes in 1.2.5. When using `musl`
+targets for static linking, this should make portable Linux binaries that do networking more
+reliable, particularly in the face of large DNS records and recursive nameservers.
+
+However, 1.2.4 also comes with a breaking change: [the removal of several legacy compatibility symbols that the Rust libc crate was using](https://github.com/rust-lang/libc/issues/2934).
+A fix for this [was shipped in libc 0.2.146 in June 2023 (2.5 years ago)](https://github.com/rust-lang/libc/pull/2935),
+and we believe has sufficiently widely propagated that we're ready to make the change in Rust
+targets.
+
+See our previous [announcement](https://blog.rust-lang.org/2025/12/05/Updating-musl-1.2.5/) for more details.
+
+### Allow the global allocator to use thread-local storage
+
+Rust 1.93 adjusts the internals of the standard library to permit global allocators written in Rust
+to use std's [`thread_local!`](https://doc.rust-lang.org/stable/std/macro.thread_local.html) and
+[`std::thread::current`](https://doc.rust-lang.org/stable/std/thread/fn.current.html) without
+re-entrancy concerns by using the system allocator instead.
+
+See [docs](https://doc.rust-lang.org/nightly/std/alloc/trait.GlobalAlloc.html#re-entrance) for details.
+
+### `cfg` attributes on `asm!` lines
+
+Previously, if individual parts of a section of inline assembly needed to be `cfg`'d, the full `asm!`
+block would need to be repeated with and without that section. In 1.93, `cfg` can now be applied to
+individual statements within the `asm!` block.
+
+```rust
+asm!( // or global_asm! or naked_asm!
+    "nop",
+    #[cfg(target_feature = "sse2")]
+    "nop",
+    // ...
+    #[cfg(target_feature = "sse2")]
+    a = const 123, // only used on sse2
+);
+```
+
+### Stabilized APIs
+
+- [`<MaybeUninit<T>>::assume_init_drop`](https://doc.rust-lang.org/stable/core/mem/union.MaybeUninit.html#method.assume_init_drop)
+- [`<MaybeUninit<T>>::assume_init_ref`](https://doc.rust-lang.org/stable/core/mem/union.MaybeUninit.html#method.assume_init_ref)
+- [`<MaybeUninit<T>>::assume_init_mut`](https://doc.rust-lang.org/stable/core/mem/union.MaybeUninit.html#method.assume_init_mut)
+- [`<[MaybeUninit<T>]>::write_copy_of_slice`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.write_copy_of_slice)
+- [`<[MaybeUninit<T>]>::write_clone_of_slice`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.write_clone_of_slice)
+- [`String::into_raw_parts`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.into_raw_parts)
+- [`Vec::into_raw_parts`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.into_raw_parts)
+- [`<uN>::unchecked_add`](https://doc.rust-lang.org/stable/std/primitive.usize.html#method.unchecked_add)
+- [`<uN>::unchecked_sub`](https://doc.rust-lang.org/stable/std/primitive.usize.html#method.unchecked_sub)
+- [`<uN>::unchecked_mul`](https://doc.rust-lang.org/stable/std/primitive.usize.html#method.unchecked_mul)
+- [`<iN>::unchecked_add`](https://doc.rust-lang.org/stable/std/primitive.isize.html#method.unchecked_add)
+- [`<iN>::unchecked_sub`](https://doc.rust-lang.org/stable/std/primitive.isize.html#method.unchecked_sub)
+- [`<iN>::unchecked_mul`](https://doc.rust-lang.org/stable/std/primitive.isize.html#method.unchecked_mul)
+- [`<[T]>::as_array`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_array)
+- [`<[T]>::as_array_mut`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_array)
+- [`<*const [T]>::as_array`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.as_array)
+- [`<*mut [T]>::as_array_mut`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.as_mut_array)
+- [`VecDeque::pop_front_if`](https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.pop_front_if)
+- [`VecDeque::pop_back_if`](https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.pop_back_if)
+- [`Duration::from_nanos_u128`](https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.from_nanos_u128)
+- [`char::MAX_LEN_UTF8`](https://doc.rust-lang.org/stable/std/primitive.char.html#associatedconstant.MAX_LEN_UTF8)
+- [`char::MAX_LEN_UTF16`](https://doc.rust-lang.org/stable/std/primitive.char.html#associatedconstant.MAX_LEN_UTF16)
+- [`std::fmt::from_fn`](https://doc.rust-lang.org/stable/std/fmt/fn.from_fn.html)
+- [`std::fmt::FromFn`](https://doc.rust-lang.org/stable/std/fmt/struct.FromFn.html)
+
+### Other changes
+
+Check out everything that changed in [Rust](https://github.com/rust-lang/rust/releases/tag/1.93.0), [Cargo](https://doc.rust-lang.org/nightly/cargo/CHANGELOG.html#cargo-193-2026-01-22), and [Clippy](https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-193).
+
+## Contributors to 1.93.0
+
+Many people came together to create Rust 1.93.0. We couldn't have done it without all of you. [Thanks!](https://thanks.rust-lang.org/rust/1.93.0/)
+
+[platform-support]: https://doc.rust-lang.org/rustc/platform-support.html