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‎originals/announcements/Rust-1.93.0.md‎

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path = "2026/01/22/Rust-1.93.0"
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title = "Announcing Rust 1.93.0"
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authors = ["The Rust Release Team"]
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aliases = ["releases/1.93.0"]
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[extra]
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release = true
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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.
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If you have a previous version of Rust installed via `rustup`, you can get 1.93.0 with:
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```console
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$ rustup update stable
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```
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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).
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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!
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## What's in 1.93.0 stable
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### Update bundled musl to 1.2.5
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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.
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For the Rust ecosystem, the primary motivation for this update is to receive major improvements to
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musl's DNS resolver which shipped in 1.2.4 and received bug fixes in 1.2.5. When using `musl`
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targets for static linking, this should make portable Linux binaries that do networking more
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reliable, particularly in the face of large DNS records and recursive nameservers.
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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).
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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),
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and we believe has sufficiently widely propagated that we're ready to make the change in Rust
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targets.
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See our previous [announcement](https://blog.rust-lang.org/2025/12/05/Updating-musl-1.2.5/) for more details.
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### Allow the global allocator to use thread-local storage
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Rust 1.93 adjusts the internals of the standard library to permit global allocators written in Rust
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to use std's [`thread_local!`](https://doc.rust-lang.org/stable/std/macro.thread_local.html) and
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[`std::thread::current`](https://doc.rust-lang.org/stable/std/thread/fn.current.html) without
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re-entrancy concerns by using the system allocator instead.
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See [docs](https://doc.rust-lang.org/nightly/std/alloc/trait.GlobalAlloc.html#re-entrance) for details.
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### `cfg` attributes on `asm!` lines
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Previously, if individual parts of a section of inline assembly needed to be `cfg`'d, the full `asm!`
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block would need to be repeated with and without that section. In 1.93, `cfg` can now be applied to
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individual statements within the `asm!` block.
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```rust
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asm!( // or global_asm! or naked_asm!
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"nop",
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#[cfg(target_feature = "sse2")]
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"nop",
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// ...
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#[cfg(target_feature = "sse2")]
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a = const 123, // only used on sse2
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);
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```
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### Stabilized APIs
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- [`<MaybeUninit<T>>::assume_init_drop`](https://doc.rust-lang.org/stable/core/mem/union.MaybeUninit.html#method.assume_init_drop)
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- [`<MaybeUninit<T>>::assume_init_ref`](https://doc.rust-lang.org/stable/core/mem/union.MaybeUninit.html#method.assume_init_ref)
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- [`<MaybeUninit<T>>::assume_init_mut`](https://doc.rust-lang.org/stable/core/mem/union.MaybeUninit.html#method.assume_init_mut)
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- [`<[MaybeUninit<T>]>::write_copy_of_slice`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.write_copy_of_slice)
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- [`<[MaybeUninit<T>]>::write_clone_of_slice`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.write_clone_of_slice)
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- [`String::into_raw_parts`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.into_raw_parts)
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- [`Vec::into_raw_parts`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.into_raw_parts)
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- [`<uN>::unchecked_add`](https://doc.rust-lang.org/stable/std/primitive.usize.html#method.unchecked_add)
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- [`<uN>::unchecked_sub`](https://doc.rust-lang.org/stable/std/primitive.usize.html#method.unchecked_sub)
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- [`<uN>::unchecked_mul`](https://doc.rust-lang.org/stable/std/primitive.usize.html#method.unchecked_mul)
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- [`<iN>::unchecked_add`](https://doc.rust-lang.org/stable/std/primitive.isize.html#method.unchecked_add)
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- [`<iN>::unchecked_sub`](https://doc.rust-lang.org/stable/std/primitive.isize.html#method.unchecked_sub)
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- [`<iN>::unchecked_mul`](https://doc.rust-lang.org/stable/std/primitive.isize.html#method.unchecked_mul)
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- [`<[T]>::as_array`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_array)
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- [`<[T]>::as_array_mut`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_array)
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- [`<*const [T]>::as_array`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.as_array)
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- [`<*mut [T]>::as_array_mut`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.as_mut_array)
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- [`VecDeque::pop_front_if`](https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.pop_front_if)
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- [`VecDeque::pop_back_if`](https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.pop_back_if)
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- [`Duration::from_nanos_u128`](https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.from_nanos_u128)
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- [`char::MAX_LEN_UTF8`](https://doc.rust-lang.org/stable/std/primitive.char.html#associatedconstant.MAX_LEN_UTF8)
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- [`char::MAX_LEN_UTF16`](https://doc.rust-lang.org/stable/std/primitive.char.html#associatedconstant.MAX_LEN_UTF16)
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- [`std::fmt::from_fn`](https://doc.rust-lang.org/stable/std/fmt/fn.from_fn.html)
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- [`std::fmt::FromFn`](https://doc.rust-lang.org/stable/std/fmt/struct.FromFn.html)
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### Other changes
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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).
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## Contributors to 1.93.0
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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/)
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[platform-support]: https://doc.rust-lang.org/rustc/platform-support.html

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