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posts/2023-07-13-Rust-1.71.0.md

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+---
+layout: post
+title: "Announcing Rust 1.71.0"
+author: The Rust Release Team
+release: true
+---
+
+The Rust team is happy to announce a new version of Rust, 1.71.0. 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 1.71.0 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 1.71.0](https://github.com/rust-lang/rust/releases/tag/1.71.0) on GitHub.
+
+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 1.71.0 stable
+
+### C-unwind ABI
+
+1.71.0 stabilizes `C-unwind` (and other `-unwind` suffixed ABI variants[^1]).
+
+The behavior for unforced unwinding (the typical case) is specified in [this
+table from the RFC which proposed this feature][rfc-table]. To summarize:
+
+Each ABI is mostly equivalent to the same ABI without `-unwind`, except that
+the behavior is defined to be safe when an unwinding operation (`panic` or C++
+style exception) crosses the ABI boundary. For `panic=unwind`, this is a valid
+way to let exceptions from one language unwind the stack in another language
+without terminating the process (as long as the exception is caught in the same
+language from which it originated); for `panic=abort`, this will typically
+abort the process immediately.
+
+For this initial stabilization, *no change* is made to the existing ABIs (e.g.
+`"C"`). The existing ABIs have soundness holes around unwinding, though, which
+will be fixed when the behavior described in the RFC is stabilized. This change
+will happen in a future Rust release, and users are encouraged to start using
+the new unwind variants in their code to remain future proof if they wish to
+unwind across the ABI boundary.
+
+### Debugger visualization attributes
+
+1.71.0 stabilizes support for a new attribute, `#[debug_visualizer(natvis_file
+= "...")]` and `#[debug_visualizer(gdb_script_file = "...")]`, which allows
+embedding Natviz descriptions and GDB scripts into Rust libraries to
+improve debugger output when inspecting data structures created by those
+libraries. Rust itself has packaged similar scripts for some time for the
+standard library, but this feature makes it possible for library authors to
+provide a similar experience to end users.
+
+See the [reference](https://doc.rust-lang.org/nightly/reference/attributes/debugger.html#the-debugger_visualizer-attribute)
+for details on usage.
+
+### Const-initialized thread locals
+
+Rust 1.59.0 stabilized `const` initialized thread local support in the standard
+library, which allows for more optimal code generation. However, until now this
+feature was missed in release notes and
+[documentation](https://doc.rust-lang.org/stable/std/macro.thread_local.html).
+
+```rust
+use std::cell::Cell;
+
+thread_local! {
+    pub static FOO: Cell<u32> = const { Cell::new(1) };
+}
+```
+
+### Stabilized APIs
+
+- [`CStr::is_empty`](https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.is_empty)
+- [`BuildHasher::hash_one`](https://doc.rust-lang.org/stable/std/hash/trait.BuildHasher.html#method.hash_one)
+- [`NonZeroI*::is_positive`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#method.is_positive)
+- [`NonZeroI*::is_negative`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#method.is_negative)
+- [`NonZeroI*::checked_neg`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#method.checked_neg)
+- [`NonZeroI*::overflowing_neg`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#method.overflowing_neg)
+- [`NonZeroI*::saturating_neg`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#method.saturating_neg)
+- [`NonZeroI*::wrapping_neg`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#method.wrapping_neg)
+- [`Neg for NonZeroI*`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#impl-Neg-for-NonZeroI32)
+- [`Neg for &NonZeroI*`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#impl-Neg-for-%26NonZeroI32)
+- [`From<[T; N]> for (T...)`](https://doc.rust-lang.org/stable/std/primitive.array.html#impl-From%3C%5BT;+1%5D%3E-for-(T,))
+  (array to N-tuple for N in 1..=12)
+- [`From<(T...)> for [T; N]`](https://doc.rust-lang.org/stable/std/primitive.array.html#impl-From%3C(T,)%3E-for-%5BT;+1%5D)
+  (N-tuple to array for N in 1..=12)
+- [`windows::io::AsHandle for Box<T>`](https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsHandle.html#impl-AsHandle-for-Box%3CT%3E)
+- [`windows::io::AsHandle for Rc<T>`](https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsHandle.html#impl-AsHandle-for-Rc%3CT%3E)
+- [`windows::io::AsHandle for Arc<T>`](https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsHandle.html#impl-AsHandle-for-Arc%3CT%3E)
+- [`windows::io::AsSocket for Box<T>`](https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsSocket.html#impl-AsSocket-for-Box%3CT%3E)
+- [`windows::io::AsSocket for Rc<T>`](https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsSocket.html#impl-AsSocket-for-Rc%3CT%3E)
+- [`windows::io::AsSocket for Arc<T>`](https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsSocket.html#impl-AsSocket-for-Arc%3CT%3E)
+
+These APIs are now stable in const contexts:
+
+- [`<*const T>::read`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.read)
+- [`<*const T>::read_unaligned`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.read_unaligned)
+- [`<*mut T>::read`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.read-1)
+- [`<*mut T>::read_unaligned`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.read_unaligned-1)
+- [`ptr::read`](https://doc.rust-lang.org/stable/std/ptr/fn.read.html)
+- [`ptr::read_unaligned`](https://doc.rust-lang.org/stable/std/ptr/fn.read_unaligned.html)
+- [`<[T]>::split_at`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_at)
+
+### Other changes
+
+Check out everything that changed in [Rust](https://github.com/rust-lang/rust/releases/tag/1.71.0), [Cargo](https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-171-2023-07-13), and [Clippy](https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-171).
+
+## Contributors to 1.71.0
+
+Many people came together to create Rust 1.71.0. We couldn't have done it without all of you. [Thanks!](https://thanks.rust-lang.org/rust/1.71.0/)
+
+[^1]: List of stabilized ABIs can be found in the stabilization report: https://github.com/rust-lang/rust/issues/74990#issuecomment-1363473645 
+
+[rfc-table]: https://github.com/rust-lang/rfcs/blob/master/text/2945-c-unwind-abi.md#abi-boundaries-and-unforced-unwinding