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Auto merge of #97084 - Mark-Simulacrum:stable-next, r=Mark-Simulacrum
[stable] Rust 1.61 * Cherry-picking release notes from not yet landed #96539. r? `@Mark-Simulacrum`
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‎RELEASES.md

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Version 1.61.0 (2022-05-19)
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==========================
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Language
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--------
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- [`const fn` signatures can now include generic trait bounds][93827]
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- [`const fn` signatures can now use `impl Trait` in argument and return position][93827]
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- [Function pointers can now be created, cast, and passed around in a `const fn`][93827]
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- [Recursive calls can now set the value of a function's opaque `impl Trait` return type][94081]
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Compiler
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--------
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- [Linking modifier syntax in `#[link]` attributes and on the command line, as well as the `whole-archive` modifier specifically, are now supported][93901]
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- [The `char` type is now described as UTF-32 in debuginfo][89887]
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- The [`#[target_feature]`][target_feature] attribute [can now be used with aarch64 features][90621]
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- X86 [`#[target_feature = "adx"]` is now stable][93745]
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Libraries
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---------
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- [`ManuallyDrop<T>` is now documented to have the same layout as `T`][88375]
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- [`#[ignore = "…"]` messages are printed when running tests][92714]
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- [Consistently present absent stdio handles on Windows as NULL handles][93263]
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- [Make `std::io::stdio::lock()` return `'static` handles.][93965] Previously, the creation of locked handles to stdin/stdout/stderr would borrow the handles being locked, which prevented writing `let out = std::io::stdout().lock();` because `out` would outlive the return value of `stdout()`. Such code now works, eliminating a common pitfall that affected many Rust users.
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- [`Vec::from_raw_parts` is now less restrictive about its inputs][95016]
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- [`std::thread::available_parallelism` now takes cgroup quotas into account.][92697] Since `available_parallelism` is often used to create a thread pool for parallel computation, which may be CPU-bound for performance, `available_parallelism` will return a value consistent with the ability to use that many threads continuously, if possible. For instance, in a container with 8 virtual CPUs but quotas only allowing for 50% usage, `available_parallelism` will return 4.
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Stabilized APIs
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---------------
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- [`Pin::static_mut`]
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- [`Pin::static_ref`]
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- [`Vec::retain_mut`]
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- [`VecDeque::retain_mut`]
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- [`Write` for `Cursor<[u8; N]>`][cursor-write-array]
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- [`std::os::unix::net::SocketAddr::from_pathname`]
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- [`std::process::ExitCode`] and [`std::process::Termination`]. The stabilization of these two APIs now makes it possible for programs to return errors from `main` with custom exit codes.
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- [`std::thread::JoinHandle::is_finished`]
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These APIs are now usable in const contexts:
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- [`*const T::offset` and `*mut T::offset`][ptr-offset]
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- [`*const T::wrapping_offset` and `*mut T::wrapping_offset`][ptr-wrapping_offset]
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- [`*const T::add` and `*mut T::add`][ptr-add]
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- [`*const T::sub` and `*mut T::sub`][ptr-sub]
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- [`*const T::wrapping_add` and `*mut T::wrapping_add`][ptr-wrapping_add]
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- [`*const T::wrapping_sub` and `*mut T::wrapping_sub`][ptr-wrapping_sub]
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- [`[T]::as_mut_ptr`][slice-as_mut_ptr]
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- [`[T]::as_ptr_range`][slice-as_ptr_range]
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- [`[T]::as_mut_ptr_range`][slice-as_mut_ptr_range]
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Cargo
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-----
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No feature changes, but see compatibility notes.
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Compatibility Notes
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-------------------
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- Previously native static libraries were linked as `whole-archive` in some cases, but now rustc tries not to use `whole-archive` unless explicitly requested. This [change][93901] may result in linking errors in some cases. To fix such errors, native libraries linked from the command line, build scripts, or [`#[link]` attributes][link-attr] need to
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- (more common) either be reordered to respect dependencies between them (if `a` depends on `b` then `a` should go first and `b` second)
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- (less common) or be updated to use the [`+whole-archive`] modifier.
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- [Catching a second unwind from FFI code while cleaning up from a Rust panic now causes the process to abort][92911]
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- [Proc macros no longer see `ident` matchers wrapped in groups][92472]
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- [The number of `#` in `r#` raw string literals is now required to be less than 256][95251]
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- [When checking that a dyn type satisfies a trait bound, supertrait bounds are now enforced][92285]
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- [`cargo vendor` now only accepts one value for each `--sync` flag][cargo/10448]
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- [`cfg` predicates in `all()` and `any()` are always evaluated to detect errors, instead of short-circuiting.][94295] The compatibility considerations here arise in nightly-only code that used the short-circuiting behavior of `all` to write something like `cfg(all(feature = "nightly", syntax-requiring-nightly))`, which will now fail to compile. Instead, use either `cfg_attr(feature = "nightly", ...)` or nested uses of `cfg`.
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- [bootstrap: static-libstdcpp is now enabled by default, and can now be disabled when llvm-tools is enabled][94832]
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Internal Changes
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----------------
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These changes provide no direct user facing benefits, but represent significant
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improvements to the internals and overall performance of rustc
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and related tools.
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- [debuginfo: Refactor debuginfo generation for types][94261]
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- [Remove the everybody loops pass][93913]
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[88375]: https://github.com/rust-lang/rust/pull/88375/
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[89887]: https://github.com/rust-lang/rust/pull/89887/
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[90621]: https://github.com/rust-lang/rust/pull/90621/
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[92285]: https://github.com/rust-lang/rust/pull/92285/
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[92472]: https://github.com/rust-lang/rust/pull/92472/
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[92663]: https://github.com/rust-lang/rust/pull/92663/
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[92697]: https://github.com/rust-lang/rust/pull/92697/
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[92714]: https://github.com/rust-lang/rust/pull/92714/
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[92911]: https://github.com/rust-lang/rust/pull/92911/
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[93263]: https://github.com/rust-lang/rust/pull/93263/
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[93580]: https://github.com/rust-lang/rust/pull/93580/
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[93745]: https://github.com/rust-lang/rust/pull/93745/
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[93827]: https://github.com/rust-lang/rust/pull/93827/
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[93840]: https://github.com/rust-lang/rust/pull/93840/
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[93901]: https://github.com/rust-lang/rust/pull/93901/
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[93913]: https://github.com/rust-lang/rust/pull/93913/
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[93957]: https://github.com/rust-lang/rust/pull/93957/
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[93965]: https://github.com/rust-lang/rust/pull/93965/
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[94081]: https://github.com/rust-lang/rust/pull/94081/
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[94261]: https://github.com/rust-lang/rust/pull/94261/
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[94295]: https://github.com/rust-lang/rust/pull/94295/
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[94356]: https://github.com/rust-lang/rust/pull/94356/
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[94832]: https://github.com/rust-lang/rust/pull/94832/
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[95016]: https://github.com/rust-lang/rust/pull/95016/
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[95130]: https://github.com/rust-lang/rust/pull/95130/
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[95251]: https://github.com/rust-lang/rust/pull/95251/
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[95491]: https://github.com/rust-lang/rust/pull/95491/
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[`+whole-archive`]: https://doc.rust-lang.org/stable/rustc/command-line-arguments.html#linking-modifiers-whole-archive
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[`Pin::static_mut`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_mut
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[`Pin::static_ref`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_ref
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[`Vec::retain_mut`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.retain_mut
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[`VecDeque::retain_mut`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.retain_mut
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[`std::os::unix::net::SocketAddr::from_pathname`]: https://doc.rust-lang.org/stable/std/os/unix/net/struct.SocketAddr.html#method.from_pathname
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[`std::process::ExitCode`]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html
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[`std::process::Termination`]: https://doc.rust-lang.org/stable/std/process/trait.Termination.html
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[`std::thread::JoinHandle::is_finished`]: https://doc.rust-lang.org/stable/std/thread/struct.JoinHandle.html#method.is_finished
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[cargo/10448]: https://github.com/rust-lang/cargo/pull/10448/
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[cursor-write-array]: https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#impl-Write-4
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[link-attr]: https://doc.rust-lang.org/stable/reference/items/external-blocks.html#the-link-attribute
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[ptr-add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.add
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[ptr-offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset
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[ptr-sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.sub
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[ptr-wrapping_add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_add
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[ptr-wrapping_offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_offset
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[ptr-wrapping_sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_sub
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[slice-as_mut_ptr]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr
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[slice-as_mut_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr_range
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[slice-as_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_ptr_range
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[target_feature]: https://doc.rust-lang.org/reference/attributes/codegen.html#the-target_feature-attribute
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Version 1.60.0 (2022-04-07)
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==========================
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Language
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--------
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- [Stabilize `#[cfg(panic = "...")]` for either `"unwind"` or `"abort"`.][93658]
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- [Stabilize `#[cfg(target_has_atomic = "...")]` for each integer size and `"ptr"`.][93824]
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Compiler
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--------
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- [Enable combining `+crt-static` and `relocation-model=pic` on `x86_64-unknown-linux-gnu`][86374]
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- [Fixes wrong `unreachable_pub` lints on nested and glob public reexport][87487]
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- [Stabilize `-Z instrument-coverage` as `-C instrument-coverage`][90132]
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- [Stabilize `-Z print-link-args` as `--print link-args`][91606]
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- [Add new Tier 3 target `mips64-openwrt-linux-musl`\*][92300]
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- [Add new Tier 3 target `armv7-unknown-linux-uclibceabi` (softfloat)\*][92383]
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- [Fix invalid removal of newlines from doc comments][92357]
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- [Add kernel target for RustyHermit][92670]
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- [Deny mixing bin crate type with lib crate types][92933]
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- [Make rustc use `RUST_BACKTRACE=full` by default][93566]
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- [Upgrade to LLVM 14][93577]
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\* Refer to Rust's [platform support page][platform-support-doc] for more
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information on Rust's tiered platform support.
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Libraries
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---------
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- [Guarantee call order for `sort_by_cached_key`][89621]
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- [Improve `Duration::try_from_secs_f32`/`f64` accuracy by directly processing exponent and mantissa][90247]
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- [Make `Instant::{duration_since, elapsed, sub}` saturating][89926]
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- [Remove non-monotonic clocks workarounds in `Instant::now`][89926]
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- [Make `BuildHasherDefault`, `iter::Empty` and `future::Pending` covariant][92630]
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Stabilized APIs
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---------------
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- [`Arc::new_cyclic`][arc_new_cyclic]
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- [`Rc::new_cyclic`][rc_new_cyclic]
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- [`slice::EscapeAscii`][slice_escape_ascii]
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- [`<[u8]>::escape_ascii`][slice_u8_escape_ascii]
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- [`u8::escape_ascii`][u8_escape_ascii]
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- [`Vec::spare_capacity_mut`][vec_spare_capacity_mut]
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- [`MaybeUninit::assume_init_drop`][assume_init_drop]
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- [`MaybeUninit::assume_init_read`][assume_init_read]
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- [`i8::abs_diff`][i8_abs_diff]
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- [`i16::abs_diff`][i16_abs_diff]
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- [`i32::abs_diff`][i32_abs_diff]
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- [`i64::abs_diff`][i64_abs_diff]
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- [`i128::abs_diff`][i128_abs_diff]
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- [`isize::abs_diff`][isize_abs_diff]
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- [`u8::abs_diff`][u8_abs_diff]
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- [`u16::abs_diff`][u16_abs_diff]
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- [`u32::abs_diff`][u32_abs_diff]
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- [`u64::abs_diff`][u64_abs_diff]
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- [`u128::abs_diff`][u128_abs_diff]
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- [`usize::abs_diff`][usize_abs_diff]
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- [`Display for io::ErrorKind`][display_error_kind]
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- [`From<u8> for ExitCode`][from_u8_exit_code]
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- [`Not for !` (the "never" type)][not_never]
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- [_Op_`Assign<$t> for Wrapping<$t>`][wrapping_assign_ops]
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- [`arch::is_aarch64_feature_detected!`][is_aarch64_feature_detected]
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Cargo
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-----
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- [Port cargo from `toml-rs` to `toml_edit`][cargo/10086]
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- [Stabilize `-Ztimings` as `--timings`][cargo/10245]
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- [Stabilize namespaced and weak dependency features.][cargo/10269]
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- [Accept more `cargo:rustc-link-arg-*` types from build script output.][cargo/10274]
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- [cargo-new should not add ignore rule on Cargo.lock inside subdirs][cargo/10379]
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Misc
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----
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- [Ship docs on Tier 2 platforms by reusing the closest Tier 1 platform docs][92800]
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- [Drop rustc-docs from complete profile][93742]
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- [bootstrap: tidy up flag handling for llvm build][93918]
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Compatibility Notes
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-------------------
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- [Remove compiler-rt linking hack on Android][83822]
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- [Mitigations for platforms with non-monotonic clocks have been removed from
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`Instant::now`][89926]. On platforms that don't provide monotonic clocks, an
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instant is not guaranteed to be greater than an earlier instant anymore.
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- [`Instant::{duration_since, elapsed, sub}` do not panic anymore on underflow,
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saturating to `0` instead][89926]. In the real world the panic happened mostly
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on platforms with buggy monotonic clock implementations rather than catching
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programming errors like reversing the start and end times. Such programming
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errors will now results in `0` rather than a panic.
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- In a future release we're planning to increase the baseline requirements for
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the Linux kernel to version 3.2, and for glibc to version 2.17. We'd love
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your feedback in [PR #95026][95026].
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Internal Changes
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----------------
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These changes provide no direct user facing benefits, but represent significant
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improvements to the internals and overall performance of rustc
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and related tools.
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- [Switch all libraries to the 2021 edition][92068]
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[83822]: https://github.com/rust-lang/rust/pull/83822
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[86374]: https://github.com/rust-lang/rust/pull/86374
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[87487]: https://github.com/rust-lang/rust/pull/87487
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[89621]: https://github.com/rust-lang/rust/pull/89621
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[89926]: https://github.com/rust-lang/rust/pull/89926
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[90132]: https://github.com/rust-lang/rust/pull/90132
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[90247]: https://github.com/rust-lang/rust/pull/90247
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[91606]: https://github.com/rust-lang/rust/pull/91606
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[92068]: https://github.com/rust-lang/rust/pull/92068
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[92300]: https://github.com/rust-lang/rust/pull/92300
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[92357]: https://github.com/rust-lang/rust/pull/92357
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[92383]: https://github.com/rust-lang/rust/pull/92383
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[92630]: https://github.com/rust-lang/rust/pull/92630
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[92670]: https://github.com/rust-lang/rust/pull/92670
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[92800]: https://github.com/rust-lang/rust/pull/92800
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[92933]: https://github.com/rust-lang/rust/pull/92933
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[93566]: https://github.com/rust-lang/rust/pull/93566
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[93577]: https://github.com/rust-lang/rust/pull/93577
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[93658]: https://github.com/rust-lang/rust/pull/93658
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[93742]: https://github.com/rust-lang/rust/pull/93742
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[93824]: https://github.com/rust-lang/rust/pull/93824
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[93918]: https://github.com/rust-lang/rust/pull/93918
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[95026]: https://github.com/rust-lang/rust/pull/95026
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[cargo/10086]: https://github.com/rust-lang/cargo/pull/10086
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[cargo/10245]: https://github.com/rust-lang/cargo/pull/10245
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[cargo/10269]: https://github.com/rust-lang/cargo/pull/10269
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[cargo/10274]: https://github.com/rust-lang/cargo/pull/10274
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[cargo/10379]: https://github.com/rust-lang/cargo/pull/10379
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[arc_new_cyclic]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.new_cyclic
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[rc_new_cyclic]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.new_cyclic
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[slice_escape_ascii]: https://doc.rust-lang.org/stable/std/slice/struct.EscapeAscii.html
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[slice_u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.escape_ascii
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[u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.escape_ascii
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[vec_spare_capacity_mut]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.spare_capacity_mut
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[assume_init_drop]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_drop
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[assume_init_read]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_read
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[i8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.abs_diff
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[i16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.abs_diff
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[i32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.abs_diff
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[i64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.abs_diff
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[i128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.abs_diff
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[isize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.abs_diff
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[u8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.abs_diff
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[u16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.abs_diff
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[u32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.abs_diff
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[u64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.abs_diff
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[u128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.abs_diff
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[usize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.abs_diff
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[display_error_kind]: https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#impl-Display
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[from_u8_exit_code]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html#impl-From%3Cu8%3E
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[not_never]: https://doc.rust-lang.org/stable/std/primitive.never.html#impl-Not
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[wrapping_assign_ops]: https://doc.rust-lang.org/stable/std/num/struct.Wrapping.html#trait-implementations
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[is_aarch64_feature_detected]: https://doc.rust-lang.org/stable/std/arch/macro.is_aarch64_feature_detected.html
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Version 1.59.0 (2022-02-24)
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==========================
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‎src/ci/channel

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beta
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stable

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