Add release notes for 1.71.0
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Josh Stone
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RELEASES.md
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RELEASES.md
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Version 1.71.0 (2023-07-13)
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==========================
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<a id="1.71.0-Language"></a>
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Language
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--------
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- [Remove misleading target feature aliases, inappropriately connected to AVX-512.](https://github.com/rust-lang/rust/pull/107707/)
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- [Stabilize `raw-dylib`, `link_ordinal`, `import_name_type` and `-Cdlltool`.](https://github.com/rust-lang/rust/pull/109677/)
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- [Uplift `clippy::{drop,forget}_{ref,copy}` lints.](https://github.com/rust-lang/rust/pull/109732/)
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- [Type inference is more conservative around constrained vars.](https://github.com/rust-lang/rust/pull/110100/)
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- [Use fulfillment to check `Drop` impl compatibility](https://github.com/rust-lang/rust/pull/110577/)
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<a id="1.71.0-Compiler"></a>
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Compiler
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--------
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- [Evaluate place expression in `PlaceMention`](https://github.com/rust-lang/rust/pull/104844/),
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making `let _ =` patterns more consistent with respect to the borrow checker.
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- [Add `--print deployment-target` flag for Apple targets.](https://github.com/rust-lang/rust/pull/105354/)
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- [Stabilize `extern "C-unwind"` and friends.](https://github.com/rust-lang/rust/pull/106075/)
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The existing `extern "C"` etc. may change behavior for cross-language unwinding in a future release.
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- [Update the version of musl used on `*-linux-musl` targets to 1.2.3](https://github.com/rust-lang/rust/pull/107129/),
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enabling [time64](https://musl.libc.org/time64.html) on 32-bit systems.
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- [Stabilize `debugger_visualizer`](https://github.com/rust-lang/rust/pull/108668/)
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for embedding metadata like Microsoft's Natvis.
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- [Enable flatten-format-args by default.](https://github.com/rust-lang/rust/pull/109999/)
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- [Make `Self` respect tuple constructor privacy.](https://github.com/rust-lang/rust/pull/111245/)
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- [Improve niche placement by trying two strategies and picking the better result.](https://github.com/rust-lang/rust/pull/108106/)
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- [Use `apple-m1` as the target CPU for `aarch64-apple-darwin`.](https://github.com/rust-lang/rust/pull/109899/)
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- [Add Tier 3 support for the `x86_64h-apple-darwin` target.](https://github.com/rust-lang/rust/pull/108795/)
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- [Promote `loongarch64-unknown-linux-gnu` to Tier 2 with host tools.](https://github.com/rust-lang/rust/pull/110936/)
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Refer to Rust's [platform support page][platform-support-doc]
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for more information on Rust's tiered platform support.
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<a id="1.71.0-Libraries"></a>
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Libraries
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---------
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- [Remove structural match from `TypeId`.](https://github.com/rust-lang/rust/pull/103291/)
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- [Loosen `From<&[T]> for Box<[T]>` bound to `T: Clone`.](https://github.com/rust-lang/rust/pull/103406/)
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- [Remove unnecessary `T: Send` bound](https://github.com/rust-lang/rust/pull/111134/)
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in `Error for mpsc::SendError<T>` and `TrySendError<T>`.
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- [Fix docs for `alloc::realloc`](https://github.com/rust-lang/rust/pull/108630/)
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to match `Layout` requirements that the size must not exceed `isize::MAX`.
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- [Document `const {}` syntax for `std::thread_local`.](https://github.com/rust-lang/rust/pull/110620/)
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This syntax was stabilized in Rust 1.59, but not previously mentioned in release notes.
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<a id="1.71.0-Stabilized-APIs"></a>
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Stabilized APIs
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---------------
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- [`CStr::is_empty`](https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.is_empty)
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- [`BuildHasher::hash_one`](https://doc.rust-lang.org/stable/std/hash/trait.BuildHasher.html#method.hash_one)
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- [`NonZeroI*::is_positive`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#method.is_positive)
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- [`NonZeroI*::is_negative`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#method.is_negative)
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- [`NonZeroI*::checked_neg`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#method.checked_neg)
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- [`NonZeroI*::overflowing_neg`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#method.overflowing_neg)
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- [`NonZeroI*::saturating_neg`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#method.saturating_neg)
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- [`NonZeroI*::wrapping_neg`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#method.wrapping_neg)
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- [`Neg for NonZeroI*`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#impl-Neg-for-NonZeroI32)
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- [`Neg for &NonZeroI*`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#impl-Neg-for-%26NonZeroI32)
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- [`From<[T; N]> for (T...)`](https://doc.rust-lang.org/stable/std/primitive.array.html#impl-From%3C%5BT;+1%5D%3E-for-(T,))
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(array to N-tuple for N in 1..=12)
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- [`From<(T...)> for [T; N]`](https://doc.rust-lang.org/stable/std/primitive.array.html#impl-From%3C(T,)%3E-for-%5BT;+1%5D)
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(N-tuple to array for N in 1..=12)
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- [`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)
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- [`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)
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- [`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)
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- [`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)
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- [`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)
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- [`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)
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These APIs are now stable in const contexts:
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- [`<*const T>::read`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.read)
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- [`<*const T>::read_unaligned`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.read_unaligned)
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- [`<*mut T>::read`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.read-1)
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- [`<*mut T>::read_unaligned`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.read_unaligned-1)
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- [`ptr::read`](https://doc.rust-lang.org/stable/std/ptr/fn.read.html)
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- [`ptr::read_unaligned`](https://doc.rust-lang.org/stable/std/ptr/fn.read_unaligned.html)
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- [`<[T]>::split_at`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_at)
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<a id="1.71.0-Cargo"></a>
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Cargo
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-----
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- [Allow named debuginfo options in `Cargo.toml`.](https://github.com/rust-lang/cargo/pull/11958/)
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- [Add `workspace_default_members` to the output of `cargo metadata`.](https://github.com/rust-lang/cargo/pull/11978/)
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- [`cargo add` now considers `rust-version` when selecting packages.](https://github.com/rust-lang/cargo/pull/12078/)
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- [Automatically inherit workspace fields when running `cargo new`/`cargo init`.](https://github.com/rust-lang/cargo/pull/12069/)
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<a id="1.71.0-Rustdoc"></a>
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Rustdoc
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-------
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- [Add a new `rustdoc::unescaped_backticks` lint for broken inline code.](https://github.com/rust-lang/rust/pull/105848/)
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- [Support strikethrough with single tildes.](https://github.com/rust-lang/rust/pull/111152/) (`~~old~~` vs. `~new~`)
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<a id="1.71.0-Misc"></a>
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Misc
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----
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<a id="1.71.0-Compatibility-Notes"></a>
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Compatibility Notes
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-------------------
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- [Add a `sysroot` crate to represent the standard library crates.](https://github.com/rust-lang/rust/pull/108865/)
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This does not affect stable users, but may require adjustment in tools that build their own standard library.
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- [Cargo optimizes its usage under `rustup`.](https://github.com/rust-lang/cargo/pull/11917/) When
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Cargo detects it will run `rustc` pointing to a rustup proxy, it'll try bypassing the proxy and
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use the underlying binary directly. There are assumptions around the interaction with rustup and
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`RUSTUP_TOOLCHAIN`. However, it's not expected to affect normal users.
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- [When querying a package, Cargo tries only the original name, all hyphens, and all underscores to
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handle misspellings.](https://github.com/rust-lang/cargo/pull/12083/) Previously, Cargo tried each
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combination of hyphens and underscores, causing excessive requests to crates.io.
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- Cargo now [disallows `RUSTUP_HOME`](https://github.com/rust-lang/cargo/pull/12101/) and
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[`RUSTUP_TOOLCHAIN`](https://github.com/rust-lang/cargo/pull/12107/) in the `[env]` configuration
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table. This is considered to be not a use case Cargo would like to support, since it will likely
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cause problems or lead to confusion.
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<a id="1.71.0-Internal-Changes"></a>
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Internal Changes
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----------------
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These changes do not affect any public interfaces of Rust, but they represent
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significant improvements to the performance or internals of rustc and related
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tools.
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Version 1.70.0 (2023-06-01)
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==========================
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