+Version 1.73.0 (2023-10-05)
+==========================
+
+<a id="1.73.0-Language"></a>
+
+Language
+--------
+
+- [Uplift `clippy::fn_null_check` lint as `useless_ptr_null_checks`.](https://github.com/rust-lang/rust/pull/111717/)
+- [Make `noop_method_call` warn by default.](https://github.com/rust-lang/rust/pull/111916/)
+- [Support interpolated block for `try` and `async` in macros.](https://github.com/rust-lang/rust/pull/112953/)
+- [Make `unconditional_recursion` lint detect recursive drops.](https://github.com/rust-lang/rust/pull/113902/)
+- [Future compatibility warning for some impls being incorrectly considered not overlapping.](https://github.com/rust-lang/rust/pull/114023/)
+ - [The `invalid_reference_casting` lint is now **deny-by-default** (instead of allow-by-default)](https://github.com/rust-lang/rust/pull/112431)
+
+<a id="1.73.0-Compiler"></a>
+
+Compiler
+--------
+
+- [Write version information in a `.comment` section like GCC/Clang.](https://github.com/rust-lang/rust/pull/97550/)
+- [Add documentation on v0 symbol mangling.](https://github.com/rust-lang/rust/pull/97571/)
+- [Stabilize `extern "thiscall"` and `"thiscall-unwind"` ABIs.](https://github.com/rust-lang/rust/pull/114562/)
+- [Only check outlives goals on impl compared to trait.](https://github.com/rust-lang/rust/pull/109356/)
+- [Infer type in irrefutable slice patterns with fixed length as array.](https://github.com/rust-lang/rust/pull/113199/)
+- [Discard default auto trait impls if explicit ones exist.](https://github.com/rust-lang/rust/pull/113312/)
+- Add several new tier 3 targets:
+ - [`aarch64-unknown-teeos`](https://github.com/rust-lang/rust/pull/113480/)
+ - [`csky-unknown-linux-gnuabiv2`](https://github.com/rust-lang/rust/pull/113658/)
+ - [`riscv64-linux-android`](https://github.com/rust-lang/rust/pull/112858/)
+ - [`riscv64gc-unknown-hermit`](https://github.com/rust-lang/rust/pull/114004/)
+ - [`x86_64-unikraft-linux-musl`](https://github.com/rust-lang/rust/pull/113411/)
+ - [`x86_64-unknown-linux-ohos`](https://github.com/rust-lang/rust/pull/113061/)
+- [Add `wasm32-wasi-preview1-threads` as a tier 2 target.](https://github.com/rust-lang/rust/pull/112922/)
+
+Refer to Rust's [platform support page][platform-support-doc]
+for more information on Rust's tiered platform support.
+
+<a id="1.73.0-Libraries"></a>
+
+Libraries
+---------
+
+- [Add `Read`, `Write` and `Seek` impls for `Arc<File>`.](https://github.com/rust-lang/rust/pull/94748/)
+- [Merge functionality of `io::Sink` into `io::Empty`.](https://github.com/rust-lang/rust/pull/98154/)
+- [Implement `RefUnwindSafe` for `Backtrace`](https://github.com/rust-lang/rust/pull/100455/)
+- [Make `ExitStatus` implement `Default`](https://github.com/rust-lang/rust/pull/106425/)
+- [`impl SliceIndex<str> for (Bound<usize>, Bound<usize>)`](https://github.com/rust-lang/rust/pull/111081/)
+- [Change default panic handler message format.](https://github.com/rust-lang/rust/pull/112849/)
+- [Cleaner `assert_eq!` & `assert_ne!` panic messages.](https://github.com/rust-lang/rust/pull/111071/)
+- [Correct the (deprecated) Android `stat` struct definitions.](https://github.com/rust-lang/rust/pull/113130/)
+
+<a id="1.73.0-Stabilized-APIs"></a>
+
+Stabilized APIs
+---------------
+
+- [Unsigned `{integer}::div_ceil`](https://doc.rust-lang.org/stable/std/primitive.u32.html#method.div_ceil)
+- [Unsigned `{integer}::next_multiple_of`](https://doc.rust-lang.org/stable/std/primitive.u32.html#method.next_multiple_of)
+- [Unsigned `{integer}::checked_next_multiple_of`](https://doc.rust-lang.org/stable/std/primitive.u32.html#method.checked_next_multiple_of)
+- [`std::ffi::FromBytesUntilNulError`](https://doc.rust-lang.org/stable/std/ffi/struct.FromBytesUntilNulError.html)
+- [`std::os::unix::fs::chown`](https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chown.html)
+- [`std::os::unix::fs::fchown`](https://doc.rust-lang.org/stable/std/os/unix/fs/fn.fchown.html)
+- [`std::os::unix::fs::lfchown`](https://doc.rust-lang.org/stable/std/os/unix/fs/fn.lchown.html)
+- [`LocalKey::<Cell<T>>::get`](https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.get)
+- [`LocalKey::<Cell<T>>::set`](https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.set)
+- [`LocalKey::<Cell<T>>::take`](https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.take)
+- [`LocalKey::<Cell<T>>::replace`](https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.replace)
+- [`LocalKey::<RefCell<T>>::with_borrow`](https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.with_borrow)
+- [`LocalKey::<RefCell<T>>::with_borrow_mut`](https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.with_borrow_mut)
+- [`LocalKey::<RefCell<T>>::set`](https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.set-1)
+- [`LocalKey::<RefCell<T>>::take`](https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.take-1)
+- [`LocalKey::<RefCell<T>>::replace`](https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.replace-1)
+
+These APIs are now stable in const contexts:
+
+- [`rc::Weak::new`](https://doc.rust-lang.org/stable/alloc/rc/struct.Weak.html#method.new)
+- [`sync::Weak::new`](https://doc.rust-lang.org/stable/alloc/sync/struct.Weak.html#method.new)
+- [`NonNull::as_ref`](https://doc.rust-lang.org/stable/core/ptr/struct.NonNull.html#method.as_ref)
+
+<a id="1.73.0-Cargo"></a>
+
+Cargo
+-----
+
+- [Encode URL params correctly for `SourceId` in `Cargo.lock`.](https://github.com/rust-lang/cargo/pull/12280/)
+- [Bail out an error when using `cargo::` in custom build script.](https://github.com/rust-lang/cargo/pull/12332/)
+
+<a id="1.73.0-Misc"></a>
+
+Misc
+----
+
+<a id="1.73.0-Compatibility-Notes"></a>
+
+Compatibility Notes
+-------------------
+
+- [Update the minimum external LLVM to 15.](https://github.com/rust-lang/rust/pull/114148/)
+- [Check for non-defining uses of return position `impl Trait`.](https://github.com/rust-lang/rust/pull/112842/)
+
+<a id="1.73.0-Internal-Changes"></a>
+
+Internal Changes
+----------------
+
+These changes do not affect any public interfaces of Rust, but they represent
+significant improvements to the performance or internals of rustc and related
+tools.
+
+- [Remove LLVM pointee types, supporting only opaque pointers.](https://github.com/rust-lang/rust/pull/105545/)
+- [Port PGO/LTO/BOLT optimized build pipeline to Rust.](https://github.com/rust-lang/rust/pull/112235/)
+- [Replace in-tree `rustc_apfloat` with the new version of the crate.](https://github.com/rust-lang/rust/pull/113843/)
+- [Update to LLVM 17.](https://github.com/rust-lang/rust/pull/114048/)
+- [Add `internal_features` lint for internal unstable features.](https://github.com/rust-lang/rust/pull/108955/)
+- [Mention style for new syntax in tracking issue template.](https://github.com/rust-lang/rust/pull/113586/)
+
+Version 1.72.1 (2023-09-19)
+===========================
+
+- [Adjust codegen change to improve LLVM codegen](https://github.com/rust-lang/rust/pull/115236)
+- [rustdoc: Fix self ty params in objects with lifetimes](https://github.com/rust-lang/rust/pull/115276)
+- [Fix regression in compile times](https://github.com/rust-lang/rust/pull/114948)
+- Resolve some ICE regressions in the compiler:
+ - [#115215](https://github.com/rust-lang/rust/pull/115215)
+ - [#115559](https://github.com/rust-lang/rust/pull/115559)
+
+Version 1.72.0 (2023-08-24)
+==========================
+
+<a id="1.72.0-Language"></a>
+
+Language
+--------
+
+- [Replace const eval limit by a lint and add an exponential backoff warning](https://github.com/rust-lang/rust/pull/103877/)
+- [expand: Change how `#![cfg(FALSE)]` behaves on crate root](https://github.com/rust-lang/rust/pull/110141/)
+- [Stabilize inline asm for LoongArch64](https://github.com/rust-lang/rust/pull/111235/)
+- [Uplift `clippy::undropped_manually_drops` lint](https://github.com/rust-lang/rust/pull/111530/)
+- [Uplift `clippy::invalid_utf8_in_unchecked` lint](https://github.com/rust-lang/rust/pull/111543/) as `invalid_from_utf8_unchecked` and `invalid_from_utf8`
+- [Uplift `clippy::cast_ref_to_mut` lint](https://github.com/rust-lang/rust/pull/111567/) as `invalid_reference_casting`
+- [Uplift `clippy::cmp_nan` lint](https://github.com/rust-lang/rust/pull/111818/) as `invalid_nan_comparisons`
+- [resolve: Remove artificial import ambiguity errors](https://github.com/rust-lang/rust/pull/112086/)
+- [Don't require associated types with Self: Sized bounds in `dyn Trait` objects](https://github.com/rust-lang/rust/pull/112319/)
+
+<a id="1.72.0-Compiler"></a>
+
+Compiler
+--------
+
+- [Remember names of `cfg`-ed out items to mention them in diagnostics](https://github.com/rust-lang/rust/pull/109005/)
+- [Support for native WASM exceptions](https://github.com/rust-lang/rust/pull/111322/)
+- [Add support for NetBSD/aarch64-be (big-endian arm64).](https://github.com/rust-lang/rust/pull/111326/)
+- [Write to stdout if `-` is given as output file](https://github.com/rust-lang/rust/pull/111626/)
+- [Force all native libraries to be statically linked when linking a static binary](https://github.com/rust-lang/rust/pull/111698/)
+- [Add Tier 3 support for `loongarch64-unknown-none*`](https://github.com/rust-lang/rust/pull/112310/)
+- [Prevent `.eh_frame` from being emitted for `-C panic=abort`](https://github.com/rust-lang/rust/pull/112403/)
+- [Support 128-bit enum variant in debuginfo codegen](https://github.com/rust-lang/rust/pull/112474/)
+- [compiler: update solaris/illumos to enable tsan support.](https://github.com/rust-lang/rust/pull/112039/)
+
+Refer to Rust's [platform support page][platform-support-doc]
+for more information on Rust's tiered platform support.
+
+<a id="1.72.0-Libraries"></a>
+
+Libraries
+---------
+
+- [Document memory orderings of `thread::{park, unpark}`](https://github.com/rust-lang/rust/pull/99587/)
+- [io: soften ‘at most one write attempt’ requirement in io::Write::write](https://github.com/rust-lang/rust/pull/107200/)
+- [Specify behavior of HashSet::insert](https://github.com/rust-lang/rust/pull/107619/)
+- [Relax implicit `T: Sized` bounds on `BufReader<T>`, `BufWriter<T>` and `LineWriter<T>`](https://github.com/rust-lang/rust/pull/111074/)
+- [Update runtime guarantee for `select_nth_unstable`](https://github.com/rust-lang/rust/pull/111974/)
+- [Return `Ok` on kill if process has already exited](https://github.com/rust-lang/rust/pull/112594/)
+- [Implement PartialOrd for `Vec`s over different allocators](https://github.com/rust-lang/rust/pull/112632/)
+- [Use 128 bits for TypeId hash](https://github.com/rust-lang/rust/pull/109953/)
+- [Don't drain-on-drop in DrainFilter impls of various collections.](https://github.com/rust-lang/rust/pull/104455/)
+- [Make `{Arc,Rc,Weak}::ptr_eq` ignore pointer metadata](https://github.com/rust-lang/rust/pull/106450/)
+
+<a id="1.72.0-Rustdoc"></a>
+
+Rustdoc
+-------
+
+- [Allow whitespace as path separator like double colon](https://github.com/rust-lang/rust/pull/108537/)
+- [Add search result item types after their name](https://github.com/rust-lang/rust/pull/110688/)
+- [Search for slices and arrays by type with `[]`](https://github.com/rust-lang/rust/pull/111958/)
+- [Clean up type unification and "unboxing"](https://github.com/rust-lang/rust/pull/112233/)
+
+<a id="1.72.0-Stabilized-APIs"></a>
+
+Stabilized APIs
+---------------
+
+- [`impl<T: Send> Sync for mpsc::Sender<T>`](https://doc.rust-lang.org/stable/std/sync/mpsc/struct.Sender.html#impl-Sync-for-Sender%3CT%3E)
+- [`impl TryFrom<&OsStr> for &str`](https://doc.rust-lang.org/stable/std/primitive.str.html#impl-TryFrom%3C%26'a+OsStr%3E-for-%26'a+str)
+- [`String::leak`](https://doc.rust-lang.org/stable/alloc/string/struct.String.html#method.leak)
+
+These APIs are now stable in const contexts:
+
+- [`CStr::from_bytes_with_nul`](https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
+- [`CStr::to_bytes`](https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.to_bytes)
+- [`CStr::to_bytes_with_nul`](https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.to_bytes_with_nul)
+- [`CStr::to_str`](https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.to_str)
+
+<a id="1.72.0-Cargo"></a>
+
+Cargo
+-----
+
+- Enable `-Zdoctest-in-workspace` by default. When running each documentation
+ test, the working directory is set to the root directory of the package the
+ test belongs to.
+ [docs](https://doc.rust-lang.org/nightly/cargo/commands/cargo-test.html#working-directory-of-tests)
+ [#12221](https://github.com/rust-lang/cargo/pull/12221)
+ [#12288](https://github.com/rust-lang/cargo/pull/12288)
+- Add support of the "default" keyword to reset previously set `build.jobs`
+ parallelism back to the default.
+ [#12222](https://github.com/rust-lang/cargo/pull/12222)
+
+<a id="1.72.0-Compatibility-Notes"></a>
+
+Compatibility Notes
+-------------------
+
+- [Alter `Display` for `Ipv6Addr` for IPv4-compatible addresses](https://github.com/rust-lang/rust/pull/112606/)
+- Cargo changed feature name validation check to a hard error. The warning was
+ added in Rust 1.49. These extended characters aren't allowed on crates.io, so
+ this should only impact users of other registries, or people who don't publish
+ to a registry.
+ [#12291](https://github.com/rust-lang/cargo/pull/12291)
+
+Version 1.71.1 (2023-08-03)
+===========================
+
+- [Fix CVE-2023-38497: Cargo did not respect the umask when extracting dependencies](https://github.com/rust-lang/cargo/security/advisories/GHSA-j3xp-wfr4-hx87)
+- [Fix bash completion for users of Rustup](https://github.com/rust-lang/rust/pull/113579)
+- [Do not show `suspicious_double_ref_op` lint when calling `borrow()`](https://github.com/rust-lang/rust/pull/112517)
+- [Fix ICE: substitute types before checking inlining compatibility](https://github.com/rust-lang/rust/pull/113802)
+- [Fix ICE: don't use `can_eq` in `derive(..)` suggestion for missing method](https://github.com/rust-lang/rust/pull/111516)
+- [Fix building Rust 1.71.0 from the source tarball](https://github.com/rust-lang/rust/issues/113678)
+
+Version 1.71.0 (2023-07-13)
+==========================
+
+<a id="1.71.0-Language"></a>
+
+Language
+--------
+
+- [Stabilize `raw-dylib`, `link_ordinal`, `import_name_type` and `-Cdlltool`.](https://github.com/rust-lang/rust/pull/109677/)
+- [Uplift `clippy::{drop,forget}_{ref,copy}` lints.](https://github.com/rust-lang/rust/pull/109732/)
+- [Type inference is more conservative around constrained vars.](https://github.com/rust-lang/rust/pull/110100/)
+- [Use fulfillment to check `Drop` impl compatibility](https://github.com/rust-lang/rust/pull/110577/)
+
+<a id="1.71.0-Compiler"></a>
+
+Compiler
+--------
+
+- [Evaluate place expression in `PlaceMention`](https://github.com/rust-lang/rust/pull/104844/),
+ making `let _ =` patterns more consistent with respect to the borrow checker.
+- [Add `--print deployment-target` flag for Apple targets.](https://github.com/rust-lang/rust/pull/105354/)
+- [Stabilize `extern "C-unwind"` and friends.](https://github.com/rust-lang/rust/pull/106075/)
+ The existing `extern "C"` etc. may change behavior for cross-language unwinding in a future release.
+- [Update the version of musl used on `*-linux-musl` targets to 1.2.3](https://github.com/rust-lang/rust/pull/107129/),
+ enabling [time64](https://musl.libc.org/time64.html) on 32-bit systems.
+- [Stabilize `debugger_visualizer`](https://github.com/rust-lang/rust/pull/108668/)
+ for embedding metadata like Microsoft's Natvis.
+- [Enable flatten-format-args by default.](https://github.com/rust-lang/rust/pull/109999/)
+- [Make `Self` respect tuple constructor privacy.](https://github.com/rust-lang/rust/pull/111245/)
+- [Improve niche placement by trying two strategies and picking the better result.](https://github.com/rust-lang/rust/pull/108106/)
+- [Use `apple-m1` as the target CPU for `aarch64-apple-darwin`.](https://github.com/rust-lang/rust/pull/109899/)
+- [Add Tier 3 support for the `x86_64h-apple-darwin` target.](https://github.com/rust-lang/rust/pull/108795/)
+- [Promote `loongarch64-unknown-linux-gnu` to Tier 2 with host tools.](https://github.com/rust-lang/rust/pull/110936/)
+
+Refer to Rust's [platform support page][platform-support-doc]
+for more information on Rust's tiered platform support.
+
+<a id="1.71.0-Libraries"></a>
+
+Libraries
+---------
+- [Rework handling of recursive panics.](https://github.com/rust-lang/rust/pull/110975/)
+ Additional panics are allowed while unwinding, as long as they are caught before escaping
+ a `Drop` implementation, but panicking within a panic hook is now an immediate abort.
+- [Loosen `From<&[T]> for Box<[T]>` bound to `T: Clone`.](https://github.com/rust-lang/rust/pull/103406/)
+- [Remove unnecessary `T: Send` bound](https://github.com/rust-lang/rust/pull/111134/)
+ in `Error for mpsc::SendError<T>` and `TrySendError<T>`.
+- [Fix docs for `alloc::realloc`](https://github.com/rust-lang/rust/pull/108630/)
+ to match `Layout` requirements that the size must not exceed `isize::MAX`.
+- [Document `const {}` syntax for `std::thread_local`.](https://github.com/rust-lang/rust/pull/110620/)
+ This syntax was stabilized in Rust 1.59, but not previously mentioned in release notes.
+
+<a id="1.71.0-Stabilized-APIs"></a>
+
+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)
+
+<a id="1.71.0-Cargo"></a>
+
+Cargo
+-----
+- [Allow named debuginfo options in `Cargo.toml`.](https://github.com/rust-lang/cargo/pull/11958/)
+- [Add `workspace_default_members` to the output of `cargo metadata`.](https://github.com/rust-lang/cargo/pull/11978/)
+- [Automatically inherit workspace fields when running `cargo new`/`cargo init`.](https://github.com/rust-lang/cargo/pull/12069/)
+
+<a id="1.71.0-Rustdoc"></a>
+
+Rustdoc
+-------
+
+- [Add a new `rustdoc::unescaped_backticks` lint for broken inline code.](https://github.com/rust-lang/rust/pull/105848/)
+- [Support strikethrough with single tildes.](https://github.com/rust-lang/rust/pull/111152/) (`~~old~~` vs. `~new~`)
+
+<a id="1.71.0-Misc"></a>
+
+Misc
+----
+
+<a id="1.71.0-Compatibility-Notes"></a>
+
+Compatibility Notes
+-------------------
+
+- [Remove structural match from `TypeId`.](https://github.com/rust-lang/rust/pull/103291/)
+ Code that uses a constant `TypeId` in a pattern will potentially be broken.
+ Known cases have already been fixed -- in particular, users of the `log`
+ crate's `kv_unstable` feature should update to `log v0.4.18` or later.
+- [Add a `sysroot` crate to represent the standard library crates.](https://github.com/rust-lang/rust/pull/108865/)
+ This does not affect stable users, but may require adjustment in tools that build their own standard library.
+- [Cargo optimizes its usage under `rustup`.](https://github.com/rust-lang/cargo/pull/11917/) When
+ Cargo detects it will run `rustc` pointing to a rustup proxy, it'll try bypassing the proxy and
+ use the underlying binary directly. There are assumptions around the interaction with rustup and
+ `RUSTUP_TOOLCHAIN`. However, it's not expected to affect normal users.
+- [When querying a package, Cargo tries only the original name, all hyphens, and all underscores to
+ handle misspellings.](https://github.com/rust-lang/cargo/pull/12083/) Previously, Cargo tried each
+ combination of hyphens and underscores, causing excessive requests to crates.io.
+- Cargo now [disallows `RUSTUP_HOME`](https://github.com/rust-lang/cargo/pull/12101/) and
+ [`RUSTUP_TOOLCHAIN`](https://github.com/rust-lang/cargo/pull/12107/) in the `[env]` configuration
+ table. This is considered to be not a use case Cargo would like to support, since it will likely
+ cause problems or lead to confusion.
+
+<a id="1.71.0-Internal-Changes"></a>
+
+Internal Changes
+----------------
+
+These changes do not affect any public interfaces of Rust, but they represent
+significant improvements to the performance or internals of rustc and related
+tools.
+
+
+Version 1.70.0 (2023-06-01)
+==========================
+
+<a id="1.70.0-Language"></a>
+
+Language
+--------
+- [Relax ordering rules for `asm!` operands](https://github.com/rust-lang/rust/pull/105798/)
+- [Properly allow macro expanded `format_args` invocations to uses captures](https://github.com/rust-lang/rust/pull/106505/)
+- [Lint ambiguous glob re-exports](https://github.com/rust-lang/rust/pull/107880/)
+- [Perform const and unsafe checking for expressions in `let _ = expr` position.](https://github.com/rust-lang/rust/pull/102256/)
+
+<a id="1.70.0-Compiler"></a>
+
+Compiler
+--------
+- [Extend -Cdebuginfo with new options and named aliases](https://github.com/rust-lang/rust/pull/109808/)
+ This provides a smaller version of debuginfo for cases that only need line number information
+ (`-Cdebuginfo=line-tables-only`), which may eventually become the default for `-Cdebuginfo=1`.
+- [Make `unused_allocation` lint against `Box::new` too](https://github.com/rust-lang/rust/pull/104363/)
+- [Detect uninhabited types early in const eval](https://github.com/rust-lang/rust/pull/109435/)
+- [Switch to LLD as default linker for {arm,thumb}v4t-none-eabi](https://github.com/rust-lang/rust/pull/109721/)
+- [Add tier 3 target `loongarch64-unknown-linux-gnu`](https://github.com/rust-lang/rust/pull/96971)
+- [Add tier 3 target for `i586-pc-nto-qnx700` (QNX Neutrino RTOS, version 7.0)](https://github.com/rust-lang/rust/pull/109173/),
+- [Insert alignment checks for pointer dereferences as debug assertions](https://github.com/rust-lang/rust/pull/98112)
+ This catches undefined behavior at runtime, and may cause existing code to fail.
+
+Refer to Rust's [platform support page][platform-support-doc]
+for more information on Rust's tiered platform support.
+
+<a id="1.70.0-Libraries"></a>
+
+Libraries
+---------
+- [Document NonZeroXxx layout guarantees](https://github.com/rust-lang/rust/pull/94786/)
+- [Windows: make `Command` prefer non-verbatim paths](https://github.com/rust-lang/rust/pull/96391/)
+- [Implement Default for some alloc/core iterators](https://github.com/rust-lang/rust/pull/99929/)
+- [Fix handling of trailing bare CR in str::lines](https://github.com/rust-lang/rust/pull/100311/)
+- [allow negative numeric literals in `concat!`](https://github.com/rust-lang/rust/pull/106844/)
+- [Add documentation about the memory layout of `Cell`](https://github.com/rust-lang/rust/pull/106921/)
+- [Use `partial_cmp` to implement tuple `lt`/`le`/`ge`/`gt`](https://github.com/rust-lang/rust/pull/108157/)
+- [Stabilize `atomic_as_ptr`](https://github.com/rust-lang/rust/pull/108419/)
+- [Stabilize `nonnull_slice_from_raw_parts`](https://github.com/rust-lang/rust/pull/97506/)
+- [Partial stabilization of `once_cell`](https://github.com/rust-lang/rust/pull/105587/)
+- [Stabilize `nonzero_min_max`](https://github.com/rust-lang/rust/pull/106633/)
+- [Flatten/inline format_args!() and (string and int) literal arguments into format_args!()](https://github.com/rust-lang/rust/pull/106824/)
+- [Stabilize movbe target feature](https://github.com/rust-lang/rust/pull/107711/)
+- [don't splice from files into pipes in io::copy](https://github.com/rust-lang/rust/pull/108283/)
+- [Add a builtin unstable `FnPtr` trait that is implemented for all function pointers](https://github.com/rust-lang/rust/pull/108080/)
+ This extends `Debug`, `Pointer`, `Hash`, `PartialEq`, `Eq`, `PartialOrd`, and `Ord`
+ implementations for function pointers with all ABIs.
+
+<a id="1.70.0-Stabilized-APIs"></a>
+
+Stabilized APIs
+---------------
+
+- [`NonZero*::MIN/MAX`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI8.html#associatedconstant.MIN)
+- [`BinaryHeap::retain`](https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.retain)
+- [`Default for std::collections::binary_heap::IntoIter`](https://doc.rust-lang.org/stable/std/collections/binary_heap/struct.IntoIter.html)
+- [`Default for std::collections::btree_map::{IntoIter, Iter, IterMut}`](https://doc.rust-lang.org/stable/std/collections/btree_map/struct.IntoIter.html)
+- [`Default for std::collections::btree_map::{IntoKeys, Keys}`](https://doc.rust-lang.org/stable/std/collections/btree_map/struct.IntoKeys.html)
+- [`Default for std::collections::btree_map::{IntoValues, Values}`](https://doc.rust-lang.org/stable/std/collections/btree_map/struct.IntoValues.html)
+- [`Default for std::collections::btree_map::Range`](https://doc.rust-lang.org/stable/std/collections/btree_map/struct.Range.html)
+- [`Default for std::collections::btree_set::{IntoIter, Iter}`](https://doc.rust-lang.org/stable/std/collections/btree_set/struct.IntoIter.html)
+- [`Default for std::collections::btree_set::Range`](https://doc.rust-lang.org/stable/std/collections/btree_set/struct.Range.html)
+- [`Default for std::collections::linked_list::{IntoIter, Iter, IterMut}`](https://doc.rust-lang.org/stable/alloc/collections/linked_list/struct.IntoIter.html)
+- [`Default for std::vec::IntoIter`](https://doc.rust-lang.org/stable/alloc/vec/struct.IntoIter.html#impl-Default-for-IntoIter%3CT,+A%3E)
+- [`Default for std::iter::Chain`](https://doc.rust-lang.org/stable/std/iter/struct.Chain.html)
+- [`Default for std::iter::Cloned`](https://doc.rust-lang.org/stable/std/iter/struct.Cloned.html)
+- [`Default for std::iter::Copied`](https://doc.rust-lang.org/stable/std/iter/struct.Copied.html)
+- [`Default for std::iter::Enumerate`](https://doc.rust-lang.org/stable/std/iter/struct.Enumerate.html)
+- [`Default for std::iter::Flatten`](https://doc.rust-lang.org/stable/std/iter/struct.Flatten.html)
+- [`Default for std::iter::Fuse`](https://doc.rust-lang.org/stable/std/iter/struct.Fuse.html)
+- [`Default for std::iter::Rev`](https://doc.rust-lang.org/stable/std/iter/struct.Rev.html)
+- [`Default for std::slice::Iter`](https://doc.rust-lang.org/stable/std/slice/struct.Iter.html)
+- [`Default for std::slice::IterMut`](https://doc.rust-lang.org/stable/std/slice/struct.IterMut.html)
+- [`Rc::into_inner`](https://doc.rust-lang.org/stable/alloc/rc/struct.Rc.html#method.into_inner)
+- [`Arc::into_inner`](https://doc.rust-lang.org/stable/alloc/sync/struct.Arc.html#method.into_inner)
+- [`std::cell::OnceCell`](https://doc.rust-lang.org/stable/std/cell/struct.OnceCell.html)
+- [`Option::is_some_and`](https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.is_some_and)
+- [`NonNull::slice_from_raw_parts`](https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.slice_from_raw_parts)
+- [`Result::is_ok_and`](https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.is_ok_and)
+- [`Result::is_err_and`](https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.is_err_and)
+- [`std::sync::atomic::Atomic*::as_ptr`](https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicU8.html#method.as_ptr)
+- [`std::io::IsTerminal`](https://doc.rust-lang.org/stable/std/io/trait.IsTerminal.html)
+- [`std::os::linux::net::SocketAddrExt`](https://doc.rust-lang.org/stable/std/os/linux/net/trait.SocketAddrExt.html)
+- [`std::os::unix::net::UnixDatagram::bind_addr`](https://doc.rust-lang.org/stable/std/os/unix/net/struct.UnixDatagram.html#method.bind_addr)
+- [`std::os::unix::net::UnixDatagram::connect_addr`](https://doc.rust-lang.org/stable/std/os/unix/net/struct.UnixDatagram.html#method.connect_addr)
+- [`std::os::unix::net::UnixDatagram::send_to_addr`](https://doc.rust-lang.org/stable/std/os/unix/net/struct.UnixDatagram.html#method.send_to_addr)
+- [`std::os::unix::net::UnixListener::bind_addr`](https://doc.rust-lang.org/stable/std/os/unix/net/struct.UnixListener.html#method.bind_addr)
+- [`std::path::Path::as_mut_os_str`](https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.as_mut_os_str)
+- [`std::sync::OnceLock`](https://doc.rust-lang.org/stable/std/sync/struct.OnceLock.html)
+
+<a id="1.70.0-Cargo"></a>
+
+Cargo
+-----
+
+- [Add `CARGO_PKG_README`](https://github.com/rust-lang/cargo/pull/11645/)
+- [Make `sparse` the default protocol for crates.io](https://github.com/rust-lang/cargo/pull/11791/)
+- [Accurately show status when downgrading dependencies](https://github.com/rust-lang/cargo/pull/11839/)
+- [Use registry.default for login/logout](https://github.com/rust-lang/cargo/pull/11949/)
+- [Stabilize `cargo logout`](https://github.com/rust-lang/cargo/pull/11950/)
+
+<a id="1.70.0-Misc"></a>
+
+Misc
+----
+
+- [Stabilize rustdoc `--test-run-directory`](https://github.com/rust-lang/rust/pull/103682/)
+
+<a id="1.70.0-Compatibility-Notes"></a>
+
+Compatibility Notes
+-------------------
+
+- [Prevent stable `libtest` from supporting `-Zunstable-options`](https://github.com/rust-lang/rust/pull/109044/)
+- [Perform const and unsafe checking for expressions in `let _ = expr` position.](https://github.com/rust-lang/rust/pull/102256/)
+- [WebAssembly targets enable `sign-ext` and `mutable-globals` features in codegen](https://github.com/rust-lang/rust/issues/109807)
+ This may cause incompatibility with older execution environments.
+- [Insert alignment checks for pointer dereferences as debug assertions](https://github.com/rust-lang/rust/pull/98112)
+ This catches undefined behavior at runtime, and may cause existing code to fail.
+
+<a id="1.70.0-Internal-Changes"></a>
+
+Internal Changes
+----------------
+
+These changes do not affect any public interfaces of Rust, but they represent
+significant improvements to the performance or internals of rustc and related
+tools.
+
+- [Upgrade to LLVM 16](https://github.com/rust-lang/rust/pull/109474/)
+- [Use SipHash-1-3 instead of SipHash-2-4 for StableHasher](https://github.com/rust-lang/rust/pull/107925/)
+
+Version 1.69.0 (2023-04-20)
+==========================
+
+<a id="1.69.0-Language"></a>
+
+Language
+--------
+
+- [Deriving built-in traits on packed structs works with `Copy` fields.](https://github.com/rust-lang/rust/pull/104429/)
+- [Stabilize the `cmpxchg16b` target feature on x86 and x86_64.](https://github.com/rust-lang/rust/pull/106774/)
+- [Improve analysis of trait bounds for associated types.](https://github.com/rust-lang/rust/pull/103695/)
+- [Allow associated types to be used as union fields.](https://github.com/rust-lang/rust/pull/106938/)
+- [Allow `Self: Autotrait` bounds on dyn-safe trait methods.](https://github.com/rust-lang/rust/pull/107082/)
+- [Treat `str` as containing `[u8]` for auto trait purposes.](https://github.com/rust-lang/rust/pull/107941/)
+
+<a id="1.69.0-Compiler"></a>
+
+Compiler
+--------
+
+- [Upgrade `*-pc-windows-gnu` on CI to mingw-w64 v10 and GCC 12.2.](https://github.com/rust-lang/rust/pull/100178/)
+- [Rework min_choice algorithm of member constraints.](https://github.com/rust-lang/rust/pull/105300/)
+- [Support `true` and `false` as boolean flags in compiler arguments.](https://github.com/rust-lang/rust/pull/107043/)
+- [Default `repr(C)` enums to `c_int` size.](https://github.com/rust-lang/rust/pull/107592/)
+
+<a id="1.69.0-Libraries"></a>
+
+Libraries
+---------
+
+- [Implement the unstable `DispatchFromDyn` for cell types, allowing downstream experimentation with custom method receivers.](https://github.com/rust-lang/rust/pull/97373/)
+- [Document that `fmt::Arguments::as_str()` may return `Some(_)` in more cases after optimization, subject to change.](https://github.com/rust-lang/rust/pull/106823/)
+- [Implement `AsFd` and `AsRawFd` for `Rc`.](https://github.com/rust-lang/rust/pull/107317/)
+
+<a id="1.69.0-Stabilized-APIs"></a>
+
+Stabilized APIs
+---------------
+
+- [`CStr::from_bytes_until_nul`](https://doc.rust-lang.org/stable/core/ffi/struct.CStr.html#method.from_bytes_until_nul)
+- [`core::ffi::FromBytesUntilNulError`](https://doc.rust-lang.org/stable/core/ffi/struct.FromBytesUntilNulError.html)
+
+These APIs are now stable in const contexts:
+
+- [`SocketAddr::new`](https://doc.rust-lang.org/stable/std/net/enum.SocketAddr.html#method.new)
+- [`SocketAddr::ip`](https://doc.rust-lang.org/stable/std/net/enum.SocketAddr.html#method.ip)
+- [`SocketAddr::port`](https://doc.rust-lang.org/stable/std/net/enum.SocketAddr.html#method.port)
+- [`SocketAddr::is_ipv4`](https://doc.rust-lang.org/stable/std/net/enum.SocketAddr.html#method.is_ipv4)
+- [`SocketAddr::is_ipv6`](https://doc.rust-lang.org/stable/std/net/enum.SocketAddr.html#method.is_ipv6)
+- [`SocketAddrV4::new`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV4.html#method.new)
+- [`SocketAddrV4::ip`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV4.html#method.ip)
+- [`SocketAddrV4::port`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV4.html#method.port)
+- [`SocketAddrV6::new`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.new)
+- [`SocketAddrV6::ip`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.ip)
+- [`SocketAddrV6::port`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.port)
+- [`SocketAddrV6::flowinfo`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.flowinfo)
+- [`SocketAddrV6::scope_id`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.scope_id)
+
+<a id="1.69.0-Cargo"></a>
+
+Cargo
+-----
+
+- [Cargo now suggests `cargo fix` or `cargo clippy --fix` when compilation warnings are auto-fixable.](https://github.com/rust-lang/cargo/pull/11558/)
+- [Cargo now suggests `cargo add` if you try to install a library crate.](https://github.com/rust-lang/cargo/pull/11410/)
+- [Cargo now sets the `CARGO_BIN_NAME` environment variable also for binary examples.](https://github.com/rust-lang/cargo/pull/11705/)
+
+<a id="1.69.0-Rustdoc"></a>
+
+Rustdoc
+-----
+
+- [Vertically compact trait bound formatting.](https://github.com/rust-lang/rust/pull/102842/)
+- [Only include stable lints in `rustdoc::all` group.](https://github.com/rust-lang/rust/pull/106316/)
+- [Compute maximum Levenshtein distance based on the query.](https://github.com/rust-lang/rust/pull/107141/)
+- [Remove inconsistently-present sidebar tooltips.](https://github.com/rust-lang/rust/pull/107490/)
+- [Search by macro when query ends with `!`.](https://github.com/rust-lang/rust/pull/108143/)
+
+<a id="1.69.0-Compatibility-Notes"></a>
+
+Compatibility Notes
+-------------------
+
+- [The `rust-analysis` component from `rustup` now only contains a warning placeholder.](https://github.com/rust-lang/rust/pull/101841/) This was primarily intended for RLS, and the corresponding `-Zsave-analysis` flag has been removed from the compiler as well.
+- [Unaligned references to packed fields are now a hard error.](https://github.com/rust-lang/rust/pull/102513/) This has been a warning since 1.53, and denied by default with a future-compatibility warning since 1.62.
+- [Update the minimum external LLVM to 14.](https://github.com/rust-lang/rust/pull/107573/)
+- [Cargo now emits errors on invalid characters in a registry token.](https://github.com/rust-lang/cargo/pull/11600/)
+- [When `default-features` is set to false of a workspace dependency, and an inherited dependency of a member has `default-features = true`, Cargo will enable default features of that dependency.](https://github.com/rust-lang/cargo/pull/11409/)
+- [Cargo denies `CARGO_HOME` in the `[env]` configuration table. Cargo itself doesn't pick up this value, but recursive calls to cargo would, which was not intended.](https://github.com/rust-lang/cargo/pull/11644/)
+- [Debuginfo for build dependencies is now off if not explicitly set. This is expected to improve the overall build time.](https://github.com/rust-lang/cargo/pull/11252/)
+- [The Rust distribution no longer always includes rustdoc](https://github.com/rust-lang/rust/pull/106886)
+ If `tools = [...]` is set in config.toml, we will respect a missing rustdoc in that list. By
+ default rustdoc remains included. To retain the prior behavior explicitly add `"rustdoc"` to the
+ list.
+
+<a id="1.69.0-Internal-Changes"></a>
+
+Internal Changes
+----------------
+
+These changes do not affect any public interfaces of Rust, but they represent
+significant improvements to the performance or internals of rustc and related
+tools.
+
+- [Move `format_args!()` into AST (and expand it during AST lowering)](https://github.com/rust-lang/rust/pull/106745/)
+
+Version 1.68.2 (2023-03-28)
+===========================
+
+- [Update the GitHub RSA host key bundled within Cargo](https://github.com/rust-lang/cargo/pull/11883).
+ The key was [rotated by GitHub](https://github.blog/2023-03-23-we-updated-our-rsa-ssh-host-key/)
+ on 2023-03-24 after the old one leaked.
+- [Mark the old GitHub RSA host key as revoked](https://github.com/rust-lang/cargo/pull/11889).
+ This will prevent Cargo from accepting the leaked key even when trusted by
+ the system.
+- [Add support for `@revoked` and a better error message for `@cert-authority` in Cargo's SSH host key verification](https://github.com/rust-lang/cargo/pull/11635)
+
+Version 1.68.1 (2023-03-23)
+===========================
+
+- [Fix miscompilation in produced Windows MSVC artifacts](https://github.com/rust-lang/rust/pull/109094)
+ This was introduced by enabling ThinLTO for the distributed rustc which led
+ to miscompilations in the resulting binary. Currently this is believed to be
+ limited to the -Zdylib-lto flag used for rustc compilation, rather than a
+ general bug in ThinLTO, so only rustc artifacts should be affected.
+- [Fix --enable-local-rust builds](https://github.com/rust-lang/rust/pull/109111/)
+- [Treat `$prefix-clang` as `clang` in linker detection code](https://github.com/rust-lang/rust/pull/109156)
+- [Fix panic in compiler code](https://github.com/rust-lang/rust/pull/108162)
+
+Version 1.68.0 (2023-03-09)
+==========================
+
+<a id="1.68.0-Language"></a>
+
+Language
+--------
+
+- [Stabilize default_alloc_error_handler](https://github.com/rust-lang/rust/pull/102318/)
+ This allows usage of `alloc` on stable without requiring the
+ definition of a handler for allocation failure. Defining custom handlers is still unstable.
+- [Stabilize `efiapi` calling convention.](https://github.com/rust-lang/rust/pull/105795/)
+- [Remove implicit promotion for types with drop glue](https://github.com/rust-lang/rust/pull/105085/)
+
+<a id="1.68.0-Compiler"></a>
+
+Compiler
+--------
+
+- [Change `bindings_with_variant_name` to deny-by-default](https://github.com/rust-lang/rust/pull/104154/)
+- [Allow .. to be parsed as let initializer](https://github.com/rust-lang/rust/pull/105701/)
+- [Add `armv7-sony-vita-newlibeabihf` as a tier 3 target](https://github.com/rust-lang/rust/pull/105712/)
+- [Always check alignment during compile-time const evaluation](https://github.com/rust-lang/rust/pull/104616/)
+- [Disable "split dwarf inlining" by default.](https://github.com/rust-lang/rust/pull/106709/)
+- [Add vendor to Fuchsia's target triple](https://github.com/rust-lang/rust/pull/106429/)
+- [Enable sanitizers for s390x-linux](https://github.com/rust-lang/rust/pull/107127/)
+
+<a id="1.68.0-Libraries"></a>
+
+Libraries
+---------
+
+- [Loosen the bound on the Debug implementation of Weak.](https://github.com/rust-lang/rust/pull/90291/)
+- [Make `std::task::Context` !Send and !Sync](https://github.com/rust-lang/rust/pull/95985/)
+- [PhantomData layout guarantees](https://github.com/rust-lang/rust/pull/104081/)
+- [Don't derive Debug for `OnceWith` & `RepeatWith`](https://github.com/rust-lang/rust/pull/104163/)
+- [Implement DerefMut for PathBuf](https://github.com/rust-lang/rust/pull/105018/)
+- [Add O(1) `Vec -> VecDeque` conversion guarantee](https://github.com/rust-lang/rust/pull/105128/)
+- [Leak amplification for peek_mut() to ensure BinaryHeap's invariant is always met](https://github.com/rust-lang/rust/pull/105851/)
+
+<a id="1.68.0-Stabilized-APIs"></a>
+
+Stabilized APIs
+---------------
+
+- [`{core,std}::pin::pin!`](https://doc.rust-lang.org/stable/std/pin/macro.pin.html)
+- [`impl From<bool> for {f32,f64}`](https://doc.rust-lang.org/stable/std/primitive.f32.html#impl-From%3Cbool%3E-for-f32)
+- [`std::path::MAIN_SEPARATOR_STR`](https://doc.rust-lang.org/stable/std/path/constant.MAIN_SEPARATOR_STR.html)
+- [`impl DerefMut for PathBuf`](https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#impl-DerefMut-for-PathBuf)
+
+These APIs are now stable in const contexts:
+
+- [`VecDeque::new`](https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.new)
+
+<a id="1.68.0-Cargo"></a>
+
+Cargo
+-----
+
+- [Stabilize sparse registry support for crates.io](https://github.com/rust-lang/cargo/pull/11224/)
+- [`cargo build --verbose` tells you more about why it recompiles.](https://github.com/rust-lang/cargo/pull/11407/)
+- [Show progress of crates.io index update even `net.git-fetch-with-cli` option enabled](https://github.com/rust-lang/cargo/pull/11579/)
+
+<a id="1.68.0-Misc"></a>
+
+Misc
+----
+
+<a id="1.68.0-Compatibility-Notes"></a>
+
+Compatibility Notes
+-------------------
+
+- [Only support Android NDK 25 or newer](https://blog.rust-lang.org/2023/01/09/android-ndk-update-r25.html)
+- [Add `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` to future-incompat report](https://github.com/rust-lang/rust/pull/103418/)
+- [Only specify `--target` by default for `-Zgcc-ld=lld` on wasm](https://github.com/rust-lang/rust/pull/101792/)
+- [Bump `IMPLIED_BOUNDS_ENTAILMENT` to Deny + ReportNow](https://github.com/rust-lang/rust/pull/106465/)
+- [`std::task::Context` no longer implements Send and Sync](https://github.com/rust-lang/rust/pull/95985)
+
+<a id="1.68.0-Internal-Changes"></a>
+
+Internal Changes
+----------------
+
+These changes do not affect any public interfaces of Rust, but they represent
+significant improvements to the performance or internals of rustc and related
+tools.
+
+- [Encode spans relative to the enclosing item](https://github.com/rust-lang/rust/pull/84762/)
+- [Don't normalize in AstConv](https://github.com/rust-lang/rust/pull/101947/)
+- [Find the right lower bound region in the scenario of partial order relations](https://github.com/rust-lang/rust/pull/104765/)
+- [Fix impl block in const expr](https://github.com/rust-lang/rust/pull/104889/)
+- [Check ADT fields for copy implementations considering regions](https://github.com/rust-lang/rust/pull/105102/)
+- [rustdoc: simplify JS search routine by not messing with lev distance](https://github.com/rust-lang/rust/pull/105796/)
+- [Enable ThinLTO for rustc on `x86_64-pc-windows-msvc`](https://github.com/rust-lang/rust/pull/103591/)
+- [Enable ThinLTO for rustc on `x86_64-apple-darwin`](https://github.com/rust-lang/rust/pull/103647/)
+
+Version 1.67.1 (2023-02-09)
+===========================
+
+- [Fix interoperability with thin archives.](https://github.com/rust-lang/rust/pull/107360)
+- [Fix an internal error in the compiler build process.](https://github.com/rust-lang/rust/pull/105624)
+- [Downgrade `clippy::uninlined_format_args` to pedantic.](https://github.com/rust-lang/rust-clippy/pull/10265)
+
+Version 1.67.0 (2023-01-26)
+==========================
+
+<a id="1.67.0-Language"></a>
+
+Language
+--------
+
+- [Make `Sized` predicates coinductive, allowing cycles.](https://github.com/rust-lang/rust/pull/100386/)
+- [`#[must_use]` annotations on `async fn` also affect the `Future::Output`.](https://github.com/rust-lang/rust/pull/100633/)
+- [Elaborate supertrait obligations when deducing closure signatures.](https://github.com/rust-lang/rust/pull/101834/)
+- [Invalid literals are no longer an error under `cfg(FALSE)`.](https://github.com/rust-lang/rust/pull/102944/)
+- [Unreserve braced enum variants in value namespace.](https://github.com/rust-lang/rust/pull/103578/)
+
+<a id="1.67.0-Compiler"></a>
+
+Compiler
+--------
+
+- [Enable varargs support for calling conventions other than `C` or `cdecl`.](https://github.com/rust-lang/rust/pull/97971/)
+- [Add new MIR constant propagation based on dataflow analysis.](https://github.com/rust-lang/rust/pull/101168/)
+- [Optimize field ordering by grouping m\*2^n-sized fields with equivalently aligned ones.](https://github.com/rust-lang/rust/pull/102750/)
+- [Stabilize native library modifier `verbatim`.](https://github.com/rust-lang/rust/pull/104360/)
+
+Added, updated, and removed targets:
+
+- [Add a tier 3 target for PowerPC on AIX](https://github.com/rust-lang/rust/pull/102293/), `powerpc64-ibm-aix`.
+- [Add a tier 3 target for the Sony PlayStation 1](https://github.com/rust-lang/rust/pull/102689/), `mipsel-sony-psx`.
+- [Add tier 3 `no_std` targets for the QNX Neutrino RTOS](https://github.com/rust-lang/rust/pull/102701/),
+ `aarch64-unknown-nto-qnx710` and `x86_64-pc-nto-qnx710`.
+- [Promote UEFI targets to tier 2](https://github.com/rust-lang/rust/pull/103933/), `aarch64-unknown-uefi`, `i686-unknown-uefi`, and `x86_64-unknown-uefi`.
+- [Remove tier 3 `linuxkernel` targets](https://github.com/rust-lang/rust/pull/104015/) (not used by the actual kernel).
+
+Refer to Rust's [platform support page][platform-support-doc]
+for more information on Rust's tiered platform support.
+
+<a id="1.67.0-Libraries"></a>
+
+Libraries
+---------
+
+- [Merge `crossbeam-channel` into `std::sync::mpsc`.](https://github.com/rust-lang/rust/pull/93563/)
+- [Fix inconsistent rounding of 0.5 when formatted to 0 decimal places.](https://github.com/rust-lang/rust/pull/102935/)
+- [Derive `Eq` and `Hash` for `ControlFlow`.](https://github.com/rust-lang/rust/pull/103084/)
+- [Don't build `compiler_builtins` with `-C panic=abort`.](https://github.com/rust-lang/rust/pull/103786/)
+
+<a id="1.67.0-Stabilized-APIs"></a>
+
+Stabilized APIs
+---------------
+
+- [`{integer}::checked_ilog`](https://doc.rust-lang.org/stable/std/primitive.i32.html#method.checked_ilog)
+- [`{integer}::checked_ilog2`](https://doc.rust-lang.org/stable/std/primitive.i32.html#method.checked_ilog2)
+- [`{integer}::checked_ilog10`](https://doc.rust-lang.org/stable/std/primitive.i32.html#method.checked_ilog10)
+- [`{integer}::ilog`](https://doc.rust-lang.org/stable/std/primitive.i32.html#method.ilog)
+- [`{integer}::ilog2`](https://doc.rust-lang.org/stable/std/primitive.i32.html#method.ilog2)
+- [`{integer}::ilog10`](https://doc.rust-lang.org/stable/std/primitive.i32.html#method.ilog10)
+- [`NonZeroU*::ilog2`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroU32.html#method.ilog2)
+- [`NonZeroU*::ilog10`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroU32.html#method.ilog10)
+- [`NonZero*::BITS`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroU32.html#associatedconstant.BITS)
+
+These APIs are now stable in const contexts:
+
+- [`char::from_u32`](https://doc.rust-lang.org/stable/std/primitive.char.html#method.from_u32)
+- [`char::from_digit`](https://doc.rust-lang.org/stable/std/primitive.char.html#method.from_digit)
+- [`char::to_digit`](https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_digit)
+- [`core::char::from_u32`](https://doc.rust-lang.org/stable/core/char/fn.from_u32.html)
+- [`core::char::from_digit`](https://doc.rust-lang.org/stable/core/char/fn.from_digit.html)
+
+<a id="1.67.0-Compatibility-Notes"></a>
+
+Compatibility Notes
+-------------------
+
+- [The layout of `repr(Rust)` types now groups m\*2^n-sized fields with
+ equivalently aligned ones.](https://github.com/rust-lang/rust/pull/102750/)
+ This is intended to be an optimization, but it is also known to increase type
+ sizes in a few cases for the placement of enum tags. As a reminder, the layout
+ of `repr(Rust)` types is an implementation detail, subject to change.
+- [0.5 now rounds to 0 when formatted to 0 decimal places.](https://github.com/rust-lang/rust/pull/102935/)
+ This makes it consistent with the rest of floating point formatting that
+ rounds ties toward even digits.
+- [Chains of `&&` and `||` will now drop temporaries from their sub-expressions in
+ evaluation order, left-to-right.](https://github.com/rust-lang/rust/pull/103293/)
+ Previously, it was "twisted" such that the _first_ expression dropped its
+ temporaries _last_, after all of the other expressions dropped in order.
+- [Underscore suffixes on string literals are now a hard error.](https://github.com/rust-lang/rust/pull/103914/)
+ This has been a future-compatibility warning since 1.20.0.
+- [Stop passing `-export-dynamic` to `wasm-ld`.](https://github.com/rust-lang/rust/pull/105405/)
+- [`main` is now mangled as `__main_void` on `wasm32-wasi`.](https://github.com/rust-lang/rust/pull/105468/)
+- [Cargo now emits an error if there are multiple registries in the configuration
+ with the same index URL.](https://github.com/rust-lang/cargo/pull/10592)
+
+<a id="1.67.0-Internal-Changes"></a>
+
+Internal Changes
+----------------
+
+These changes do not affect any public interfaces of Rust, but they represent
+significant improvements to the performance or internals of rustc and related
+tools.
+
+- [Rewrite LLVM's archive writer in Rust.](https://github.com/rust-lang/rust/pull/97485/)
+
+Version 1.66.1 (2023-01-10)
+===========================
+
+- Added validation of SSH host keys for git URLs in Cargo ([CVE-2022-46176](https://www.cve.org/CVERecord?id=CVE-2022-46176))
+
+Version 1.66.0 (2022-12-15)
+==========================
+
+Language
+--------
+- [Permit specifying explicit discriminants on all `repr(Int)` enums](https://github.com/rust-lang/rust/pull/95710/)
+ ```rust
+ #[repr(u8)]
+ enum Foo {
+ A(u8) = 0,
+ B(i8) = 1,
+ C(bool) = 42,
+ }
+ ```
+- [Allow transmutes between the same type differing only in lifetimes](https://github.com/rust-lang/rust/pull/101520/)
+- [Change constant evaluation errors from a deny-by-default lint to a hard error](https://github.com/rust-lang/rust/pull/102091/)
+- [Trigger `must_use` on `impl Trait` for supertraits](https://github.com/rust-lang/rust/pull/102287/)
+ This makes `impl ExactSizeIterator` respect the existing `#[must_use]` annotation on `Iterator`.
+- [Allow `..=X` in patterns](https://github.com/rust-lang/rust/pull/102275/)
+- [Uplift `clippy::for_loops_over_fallibles` lint into rustc](https://github.com/rust-lang/rust/pull/99696/)
+- [Stabilize `sym` operands in inline assembly](https://github.com/rust-lang/rust/pull/103168/)
+- [Update to Unicode 15](https://github.com/rust-lang/rust/pull/101912/)
+- [Opaque types no longer imply lifetime bounds](https://github.com/rust-lang/rust/pull/95474/)
+ This is a soundness fix which may break code that was erroneously relying on this behavior.
+
+Compiler
+--------
+- [Add armv5te-none-eabi and thumbv5te-none-eabi tier 3 targets](https://github.com/rust-lang/rust/pull/101329/)
+ - Refer to Rust's [platform support page][platform-support-doc] for more
+ information on Rust's tiered platform support.
+- [Add support for linking against macOS universal libraries](https://github.com/rust-lang/rust/pull/98736)
+
+Libraries
+---------
+- [Fix `#[derive(Default)]` on a generic `#[default]` enum adding unnecessary `Default` bounds](https://github.com/rust-lang/rust/pull/101040/)
+- [Update to Unicode 15](https://github.com/rust-lang/rust/pull/101821/)
+
+Stabilized APIs
+---------------
+
+- [`proc_macro::Span::source_text`](https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.source_text)
+- [`uX::{checked_add_signed, overflowing_add_signed, saturating_add_signed, wrapping_add_signed}`](https://doc.rust-lang.org/stable/std/primitive.u8.html#method.checked_add_signed)
+- [`iX::{checked_add_unsigned, overflowing_add_unsigned, saturating_add_unsigned, wrapping_add_unsigned}`](https://doc.rust-lang.org/stable/std/primitive.i8.html#method.checked_add_unsigned)
+- [`iX::{checked_sub_unsigned, overflowing_sub_unsigned, saturating_sub_unsigned, wrapping_sub_unsigned}`](https://doc.rust-lang.org/stable/std/primitive.i8.html#method.checked_sub_unsigned)
+- [`BTreeSet::{first, last, pop_first, pop_last}`](https://doc.rust-lang.org/stable/std/collections/struct.BTreeSet.html#method.first)
+- [`BTreeMap::{first_key_value, last_key_value, first_entry, last_entry, pop_first, pop_last}`](https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.first_key_value)
+- [Add `AsFd` implementations for stdio lock types on WASI.](https://github.com/rust-lang/rust/pull/101768/)
+- [`impl TryFrom<Vec<T>> for Box<[T; N]>`](https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#impl-TryFrom%3CVec%3CT%2C%20Global%3E%3E-for-Box%3C%5BT%3B%20N%5D%2C%20Global%3E)
+- [`core::hint::black_box`](https://doc.rust-lang.org/stable/std/hint/fn.black_box.html)
+- [`Duration::try_from_secs_{f32,f64}`](https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.try_from_secs_f32)
+- [`Option::unzip`](https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unzip)
+- [`std::os::fd`](https://doc.rust-lang.org/stable/std/os/fd/index.html)
+
+
+Rustdoc
+-------
+
+- [Add Rustdoc warning for invalid HTML tags in the documentation](https://github.com/rust-lang/rust/pull/101720/)
+
+Cargo
+-----
+
+- [Added `cargo remove` to remove dependencies from Cargo.toml](https://doc.rust-lang.org/nightly/cargo/commands/cargo-remove.html)
+- [`cargo publish` now waits for the new version to be downloadable before exiting](https://github.com/rust-lang/cargo/pull/11062)
+
+See [detailed release notes](https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-166-2022-12-15) for more.
+
+Compatibility Notes
+-------------------
+
+- [Only apply `ProceduralMasquerade` hack to older versions of `rental`](https://github.com/rust-lang/rust/pull/94063/)
+- [Don't export `__heap_base` and `__data_end` on wasm32-wasi.](https://github.com/rust-lang/rust/pull/102385/)
+- [Don't export `__wasm_init_memory` on WebAssembly.](https://github.com/rust-lang/rust/pull/102426/)
+- [Only export `__tls_*` on wasm32-unknown-unknown.](https://github.com/rust-lang/rust/pull/102440/)
+- [Don't link to `libresolv` in libstd on Darwin](https://github.com/rust-lang/rust/pull/102766/)
+- [Update libstd's libc to 0.2.135 (to make `libstd` no longer pull in `libiconv.dylib` on Darwin)](https://github.com/rust-lang/rust/pull/103277/)
+- [Opaque types no longer imply lifetime bounds](https://github.com/rust-lang/rust/pull/95474/)
+ This is a soundness fix which may break code that was erroneously relying on this behavior.
+- [Make `order_dependent_trait_objects` show up in future-breakage reports](https://github.com/rust-lang/rust/pull/102635/)
+- [Change std::process::Command spawning to default to inheriting the parent's signal mask](https://github.com/rust-lang/rust/pull/101077/)
+
+Internal Changes
+----------------
+
+These changes do not affect any public interfaces of Rust, but they represent
+significant improvements to the performance or internals of rustc and related
+tools.
+
+- [Enable BOLT for LLVM compilation](https://github.com/rust-lang/rust/pull/94381/)
+- [Enable LTO for rustc_driver.so](https://github.com/rust-lang/rust/pull/101403/)
+
+Version 1.65.0 (2022-11-03)
+==========================
+
+Language
+--------
+- [Error on `as` casts of enums with `#[non_exhaustive]` variants](https://github.com/rust-lang/rust/pull/92744/)
+- [Stabilize `let else`](https://github.com/rust-lang/rust/pull/93628/)
+- [Stabilize generic associated types (GATs)](https://github.com/rust-lang/rust/pull/96709/)
+- [Add lints `let_underscore_drop` and `let_underscore_lock` from Clippy](https://github.com/rust-lang/rust/pull/97739/)
+- [Stabilize `break`ing from arbitrary labeled blocks ("label-break-value")](https://github.com/rust-lang/rust/pull/99332/)
+- [Uninitialized integers, floats, and raw pointers are now considered immediate UB](https://github.com/rust-lang/rust/pull/98919/).
+ Usage of `MaybeUninit` is the correct way to work with uninitialized memory.
+- [Stabilize raw-dylib for Windows x86_64, aarch64, and thumbv7a](https://github.com/rust-lang/rust/pull/99916/)
+- [Do not allow `Drop` impl on foreign ADTs](https://github.com/rust-lang/rust/pull/99576/)
+
+Compiler
+--------
+- [Stabilize -Csplit-debuginfo on Linux](https://github.com/rust-lang/rust/pull/98051/)
+- [Use niche-filling optimization even when multiple variants have data](https://github.com/rust-lang/rust/pull/94075/)
+- [Associated type projections are now verified to be well-formed prior to resolving the underlying type](https://github.com/rust-lang/rust/pull/99217/#issuecomment-1209365630)
+- [Stringify non-shorthand visibility correctly](https://github.com/rust-lang/rust/pull/100350/)
+- [Normalize struct field types when unsizing](https://github.com/rust-lang/rust/pull/101831/)
+- [Update to LLVM 15](https://github.com/rust-lang/rust/pull/99464/)
+- [Fix aarch64 call abi to correctly zeroext when needed](https://github.com/rust-lang/rust/pull/97800/)
+- [debuginfo: Generalize C++-like encoding for enums](https://github.com/rust-lang/rust/pull/98393/)
+- [Add `special_module_name` lint](https://github.com/rust-lang/rust/pull/94467/)
+- [Add support for generating unique profraw files by default when using `-C instrument-coverage`](https://github.com/rust-lang/rust/pull/100384/)
+- [Allow dynamic linking for iOS/tvOS targets](https://github.com/rust-lang/rust/pull/100636/)
+
+New targets:
+
+- [Add armv4t-none-eabi as a tier 3 target](https://github.com/rust-lang/rust/pull/100244/)
+- [Add powerpc64-unknown-openbsd and riscv64-unknown-openbsd as tier 3 targets](https://github.com/rust-lang/rust/pull/101025/)
+ - Refer to Rust's [platform support page][platform-support-doc] for more
+ information on Rust's tiered platform support.
+
+Libraries
+---------
+
+- [Don't generate `PartialEq::ne` in derive(PartialEq)](https://github.com/rust-lang/rust/pull/98655/)
+- [Windows RNG: Use `BCRYPT_RNG_ALG_HANDLE` by default](https://github.com/rust-lang/rust/pull/101325/)
+- [Forbid mixing `System` with direct system allocator calls](https://github.com/rust-lang/rust/pull/101394/)
+- [Document no support for writing to non-blocking stdio/stderr](https://github.com/rust-lang/rust/pull/101416/)
+- [`std::layout::Layout` size must not overflow `isize::MAX` when rounded up to `align`](https://github.com/rust-lang/rust/pull/95295)
+ This also changes the safety conditions on `Layout::from_size_align_unchecked`.
+
+Stabilized APIs
+---------------
+
+- [`std::backtrace::Backtrace`](https://doc.rust-lang.org/stable/std/backtrace/struct.Backtrace.html)
+- [`Bound::as_ref`](https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.as_ref)
+- [`std::io::read_to_string`](https://doc.rust-lang.org/stable/std/io/fn.read_to_string.html)
+- [`<*const T>::cast_mut`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.cast_mut)
+- [`<*mut T>::cast_const`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.cast_const)
+
+These APIs are now stable in const contexts:
+
+- [`<*const T>::offset_from`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from)
+- [`<*mut T>::offset_from`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from)
+
+Cargo
+-----
+
+- [Apply GitHub fast path even for partial hashes](https://github.com/rust-lang/cargo/pull/10807/)
+- [Do not add home bin path to PATH if it's already there](https://github.com/rust-lang/cargo/pull/11023/)
+- [Take priority into account within the pending queue](https://github.com/rust-lang/cargo/pull/11032/).
+ This slightly optimizes job scheduling by Cargo, with typically small improvements on larger crate graph builds.
+
+Compatibility Notes
+-------------------
+
+- [`std::layout::Layout` size must not overflow `isize::MAX` when rounded up to `align`](https://github.com/rust-lang/rust/pull/95295).
+ This also changes the safety conditions on `Layout::from_size_align_unchecked`.
+- [`PollFn` now only implements `Unpin` if the closure is `Unpin`](https://github.com/rust-lang/rust/pull/102737).
+ This is a possible breaking change if users were relying on the blanket unpin implementation.
+ See discussion on the PR for details of why this change was made.
+- [Drop ExactSizeIterator impl from std::char::EscapeAscii](https://github.com/rust-lang/rust/pull/99880)
+ This is a backwards-incompatible change to the standard library's surface
+ area, but is unlikely to affect real world usage.
+- [Do not consider a single repeated lifetime eligible for elision in the return type](https://github.com/rust-lang/rust/pull/103450)
+ This behavior was unintentionally changed in 1.64.0, and this release reverts that change by making this an error again.
+- [Reenable disabled early syntax gates as future-incompatibility lints](https://github.com/rust-lang/rust/pull/99935/)
+- [Update the minimum external LLVM to 13](https://github.com/rust-lang/rust/pull/100460/)
+- [Don't duplicate file descriptors into stdio fds](https://github.com/rust-lang/rust/pull/101426/)
+- [Sunset RLS](https://github.com/rust-lang/rust/pull/100863/)
+- [Deny usage of `#![cfg_attr(..., crate_type = ...)]` to set the crate type](https://github.com/rust-lang/rust/pull/99784/)
+ This strengthens the forward compatibility lint deprecated_cfg_attr_crate_type_name to deny.
+- [`llvm-has-rust-patches` allows setting the build system to treat the LLVM as having Rust-specific patches](https://github.com/rust-lang/rust/pull/101072)
+ This option may need to be set for distributions that are building Rust with a patched LLVM via `llvm-config`, not the built-in LLVM.
+- Combining three or more languages (e.g. Objective C, C++ and Rust) into one binary may hit linker limitations when using `lld`. For more information, see [issue 102754][102754].
+
+[102754]: https://github.com/rust-lang/rust/issues/102754
+
+Internal Changes
+----------------
+
+These changes do not affect any public interfaces of Rust, but they represent
+significant improvements to the performance or internals of rustc and related
+tools.
+
+- [Add `x.sh` and `x.ps1` shell scripts](https://github.com/rust-lang/rust/pull/99992/)
+- [compiletest: use target cfg instead of hard-coded tables](https://github.com/rust-lang/rust/pull/100260/)
+- [Use object instead of LLVM for reading bitcode from rlibs](https://github.com/rust-lang/rust/pull/98100/)
+- [Enable MIR inlining for optimized compilations](https://github.com/rust-lang/rust/pull/91743)
+ This provides a 3-10% improvement in compiletimes for real world crates. See [perf results](https://perf.rust-lang.org/compare.html?start=aedf78e56b2279cc869962feac5153b6ba7001ed&end=0075bb4fad68e64b6d1be06bf2db366c30bc75e1&stat=instructions:u).
+
+Version 1.64.0 (2022-09-22)
+===========================
+
+Language
+--------
+- [Unions with mutable references or tuples of allowed types are now allowed](https://github.com/rust-lang/rust/pull/97995/)
+- It is now considered valid to deallocate memory pointed to by a shared reference `&T` [if every byte in `T` is inside an `UnsafeCell`](https://github.com/rust-lang/rust/pull/98017/)
+- Unused tuple struct fields are now warned against in an allow-by-default lint, [`unused_tuple_struct_fields`](https://github.com/rust-lang/rust/pull/95977/), similar to the existing warning for unused struct fields. This lint will become warn-by-default in the future.
+
+Compiler
+--------
+- [Add Nintendo Switch as tier 3 target](https://github.com/rust-lang/rust/pull/88991/)
+ - Refer to Rust's [platform support page][platform-support-doc] for more
+ information on Rust's tiered platform support.
+- [Only compile `#[used]` as llvm.compiler.used for ELF targets](https://github.com/rust-lang/rust/pull/93718/)
+- [Add the `--diagnostic-width` compiler flag to define the terminal width.](https://github.com/rust-lang/rust/pull/95635/)
+- [Add support for link-flavor `rust-lld` for iOS, tvOS and watchOS](https://github.com/rust-lang/rust/pull/98771/)
+
+Libraries
+---------
+- [Remove restrictions on compare-exchange memory ordering.](https://github.com/rust-lang/rust/pull/98383/)
+- You can now `write!` or `writeln!` into an `OsString`: [Implement `fmt::Write` for `OsString`](https://github.com/rust-lang/rust/pull/97915/)
+- [Make RwLockReadGuard covariant](https://github.com/rust-lang/rust/pull/96820/)
+- [Implement `FusedIterator` for `std::net::[Into]Incoming`](https://github.com/rust-lang/rust/pull/97300/)
+- [`impl<T: AsRawFd> AsRawFd for {Arc,Box}<T>`](https://github.com/rust-lang/rust/pull/97437/)
+- [`ptr::copy` and `ptr::swap` are doing untyped copies](https://github.com/rust-lang/rust/pull/97712/)
+- [Add cgroupv1 support to `available_parallelism`](https://github.com/rust-lang/rust/pull/97925/)
+- [Mitigate many incorrect uses of `mem::uninitialized`](https://github.com/rust-lang/rust/pull/99182/)
+
+Stabilized APIs
+---------------
+
+- [`future::IntoFuture`](https://doc.rust-lang.org/stable/std/future/trait.IntoFuture.html)
+- [`future::poll_fn`](https://doc.rust-lang.org/stable/std/future/fn.poll_fn.html)
+- [`task::ready!`](https://doc.rust-lang.org/stable/std/task/macro.ready.html)
+- [`num::NonZero*::checked_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_mul)
+- [`num::NonZero*::checked_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_pow)
+- [`num::NonZero*::saturating_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_mul)
+- [`num::NonZero*::saturating_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_pow)
+- [`num::NonZeroI*::abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.abs)
+- [`num::NonZeroI*::checked_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.checked_abs)
+- [`num::NonZeroI*::overflowing_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.overflowing_abs)
+- [`num::NonZeroI*::saturating_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.saturating_abs)
+- [`num::NonZeroI*::unsigned_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.unsigned_abs)
+- [`num::NonZeroI*::wrapping_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.wrapping_abs)
+- [`num::NonZeroU*::checked_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_add)
+- [`num::NonZeroU*::checked_next_power_of_two`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_next_power_of_two)
+- [`num::NonZeroU*::saturating_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_add)
+- [`os::unix::process::CommandExt::process_group`](https://doc.rust-lang.org/stable/std/os/unix/process/trait.CommandExt.html#tymethod.process_group)
+- [`os::windows::fs::FileTypeExt::is_symlink_dir`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_dir)
+- [`os::windows::fs::FileTypeExt::is_symlink_file`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_file)
+
+These types were previously stable in `std::ffi`, but are now also available in `core` and `alloc`:
+
+- [`core::ffi::CStr`](https://doc.rust-lang.org/stable/core/ffi/struct.CStr.html)
+- [`core::ffi::FromBytesWithNulError`](https://doc.rust-lang.org/stable/core/ffi/struct.FromBytesWithNulError.html)
+- [`alloc::ffi::CString`](https://doc.rust-lang.org/stable/alloc/ffi/struct.CString.html)
+- [`alloc::ffi::FromVecWithNulError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.FromVecWithNulError.html)
+- [`alloc::ffi::IntoStringError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.IntoStringError.html)
+- [`alloc::ffi::NulError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.NulError.html)
+
+These types were previously stable in `std::os::raw`, but are now also available in `core::ffi` and `std::ffi`:
+
+- [`ffi::c_char`](https://doc.rust-lang.org/stable/std/ffi/type.c_char.html)
+- [`ffi::c_double`](https://doc.rust-lang.org/stable/std/ffi/type.c_double.html)
+- [`ffi::c_float`](https://doc.rust-lang.org/stable/std/ffi/type.c_float.html)
+- [`ffi::c_int`](https://doc.rust-lang.org/stable/std/ffi/type.c_int.html)
+- [`ffi::c_long`](https://doc.rust-lang.org/stable/std/ffi/type.c_long.html)
+- [`ffi::c_longlong`](https://doc.rust-lang.org/stable/std/ffi/type.c_longlong.html)
+- [`ffi::c_schar`](https://doc.rust-lang.org/stable/std/ffi/type.c_schar.html)
+- [`ffi::c_short`](https://doc.rust-lang.org/stable/std/ffi/type.c_short.html)
+- [`ffi::c_uchar`](https://doc.rust-lang.org/stable/std/ffi/type.c_uchar.html)
+- [`ffi::c_uint`](https://doc.rust-lang.org/stable/std/ffi/type.c_uint.html)
+- [`ffi::c_ulong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulong.html)
+- [`ffi::c_ulonglong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulonglong.html)
+- [`ffi::c_ushort`](https://doc.rust-lang.org/stable/std/ffi/type.c_ushort.html)
+
+These APIs are now usable in const contexts:
+
+- [`slice::from_raw_parts`](https://doc.rust-lang.org/stable/core/slice/fn.from_raw_parts.html)
+
+Cargo
+-----
+- [Packages can now inherit settings from the workspace so that the settings
+ can be centralized in one place.](https://github.com/rust-lang/cargo/pull/10859) See
+ [`workspace.package`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacepackage-table)
+ and
+ [`workspace.dependencies`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacedependencies-table)
+ for more details on how to define these common settings.
+- [Cargo commands can now accept multiple `--target` flags to build for
+ multiple targets at once](https://github.com/rust-lang/cargo/pull/10766), and the
+ [`build.target`](https://doc.rust-lang.org/nightly/cargo/reference/config.html#buildtarget)
+ config option may now take an array of multiple targets.
+- [The `--jobs` argument can now take a negative number to count backwards from
+ the max CPUs.](https://github.com/rust-lang/cargo/pull/10844)
+- [`cargo add` will now update `Cargo.lock`.](https://github.com/rust-lang/cargo/pull/10902)
+- [Added](https://github.com/rust-lang/cargo/pull/10838) the
+ [`--crate-type`](https://doc.rust-lang.org/nightly/cargo/commands/cargo-rustc.html#option-cargo-rustc---crate-type)
+ flag to `cargo rustc` to override the crate type.
+- [Significantly improved the performance fetching git dependencies from GitHub
+ when using a hash in the `rev` field.](https://github.com/rust-lang/cargo/pull/10079)
+
+Misc
+----
+- [The `rust-analyzer` rustup component is now available on the stable channel.](https://github.com/rust-lang/rust/pull/98640/)
+
+Compatibility Notes
+-------------------
+- The minimum required versions for all `-linux-gnu` targets are now at least kernel 3.2 and glibc 2.17, for targets that previously supported older versions: [Increase the minimum linux-gnu versions](https://github.com/rust-lang/rust/pull/95026/)
+- [Network primitives are now implemented with the ideal Rust layout, not the C system layout](https://github.com/rust-lang/rust/pull/78802/). This can cause problems when transmuting the types.
+- [Add assertion that `transmute_copy`'s `U` is not larger than `T`](https://github.com/rust-lang/rust/pull/98839/)
+- [A soundness bug in `BTreeMap` was fixed](https://github.com/rust-lang/rust/pull/99413/) that allowed data it was borrowing to be dropped before the container.
+- [The Drop behavior of C-like enums cast to ints has changed](https://github.com/rust-lang/rust/pull/96862/). These are already discouraged by a compiler warning.
+- [Relate late-bound closure lifetimes to parent fn in NLL](https://github.com/rust-lang/rust/pull/98835/)
+- [Errors at const-eval time are now in future incompatibility reports](https://github.com/rust-lang/rust/pull/97743/)
+- On the `thumbv6m-none-eabi` target, some incorrect `asm!` statements were erroneously accepted if they used the high registers (r8 to r14) as an input/output operand. [This is no longer accepted](https://github.com/rust-lang/rust/pull/99155/).
+- [`impl Trait` was accidentally accepted as the associated type value of return-position `impl Trait`](https://github.com/rust-lang/rust/pull/97346/), without fulfilling all the trait bounds of that associated type, as long as the hidden type satisfies said bounds. This has been fixed.
+
+Internal Changes
+----------------
+
+These changes do not affect any public interfaces of Rust, but they represent
+significant improvements to the performance or internals of rustc and related
+tools.
+
+- Windows builds now use profile-guided optimization, providing 10-20% improvements to compiler performance: [Utilize PGO for windows x64 rustc dist builds](https://github.com/rust-lang/rust/pull/96978/)
+- [Stop keeping metadata in memory before writing it to disk](https://github.com/rust-lang/rust/pull/96544/)
+- [compiletest: strip debuginfo by default for mode=ui](https://github.com/rust-lang/rust/pull/98140/)
+- Many improvements to generated code for derives, including performance improvements:
+ - [Don't use match-destructuring for derived ops on structs.](https://github.com/rust-lang/rust/pull/98446/)
+ - [Many small deriving cleanups](https://github.com/rust-lang/rust/pull/98741/)
+ - [More derive output improvements](https://github.com/rust-lang/rust/pull/98758/)
+ - [Clarify deriving code](https://github.com/rust-lang/rust/pull/98915/)
+ - [Final derive output improvements](https://github.com/rust-lang/rust/pull/99046/)
+ - [Stop injecting `#[allow(unused_qualifications)]` in generated `derive` implementations](https://github.com/rust-lang/rust/pull/99485/)
+ - [Improve `derive(Debug)`](https://github.com/rust-lang/rust/pull/98190/)
+- [Bump to clap 3](https://github.com/rust-lang/rust/pull/98213/)
+- [fully move dropck to mir](https://github.com/rust-lang/rust/pull/98641/)
+- [Optimize `Vec::insert` for the case where `index == len`.](https://github.com/rust-lang/rust/pull/98755/)
+- [Convert rust-analyzer to an in-tree tool](https://github.com/rust-lang/rust/pull/99603/)
+
+Version 1.63.0 (2022-08-11)
+==========================
+
+Language
+--------
+- [Remove migrate borrowck mode for pre-NLL errors.][95565]
+- [Modify MIR building to drop repeat expressions with length zero.][95953]
+- [Remove label/lifetime shadowing warnings.][96296]
+- [Allow explicit generic arguments in the presence of `impl Trait` args.][96868]
+- [Make `cenum_impl_drop_cast` warnings deny-by-default.][97652]
+- [Prevent unwinding when `-C panic=abort` is used regardless of declared ABI.][96959]
+- [lub: don't bail out due to empty binders.][97867]
+
+Compiler
+--------
+- [Stabilize the `bundle` native library modifier,][95818] also removing the
+ deprecated `static-nobundle` linking kind.
+- [Add Apple WatchOS compile targets\*.][95243]
+- [Add a Windows application manifest to rustc-main.][96737]
+
+\* Refer to Rust's [platform support page][platform-support-doc] for more
+ information on Rust's tiered platform support.
+
+Libraries
+---------
+- [Implement `Copy`, `Clone`, `PartialEq` and `Eq` for `core::fmt::Alignment`.][94530]
+- [Extend `ptr::null` and `null_mut` to all thin (including extern) types.][94954]
+- [`impl Read and Write for VecDeque<u8>`.][95632]
+- [STD support for the Nintendo 3DS.][95897]
+- [Use rounding in float to Duration conversion methods.][96051]
+- [Make write/print macros eagerly drop temporaries.][96455]
+- [Implement internal traits that enable `[OsStr]::join`.][96881]
+- [Implement `Hash` for `core::alloc::Layout`.][97034]
+- [Add capacity documentation for `OsString`.][97202]
+- [Put a bound on collection misbehavior.][97316]
+- [Make `std::mem::needs_drop` accept `?Sized`.][97675]
+- [`impl Termination for Infallible` and then make the `Result` impls of `Termination` more generic.][97803]
+- [Document Rust's stance on `/proc/self/mem`.][97837]
+
+Stabilized APIs
+---------------
+
+- [`array::from_fn`]
+- [`Box::into_pin`]
+- [`BinaryHeap::try_reserve`]
+- [`BinaryHeap::try_reserve_exact`]
+- [`OsString::try_reserve`]
+- [`OsString::try_reserve_exact`]
+- [`PathBuf::try_reserve`]
+- [`PathBuf::try_reserve_exact`]
+- [`Path::try_exists`]
+- [`Ref::filter_map`]
+- [`RefMut::filter_map`]
+- [`NonNull::<[T]>::len`][`NonNull::<slice>::len`]
+- [`ToOwned::clone_into`]
+- [`Ipv6Addr::to_ipv4_mapped`]
+- [`unix::io::AsFd`]
+- [`unix::io::BorrowedFd<'fd>`]
+- [`unix::io::OwnedFd`]
+- [`windows::io::AsHandle`]
+- [`windows::io::BorrowedHandle<'handle>`]
+- [`windows::io::OwnedHandle`]
+- [`windows::io::HandleOrInvalid`]
+- [`windows::io::HandleOrNull`]
+- [`windows::io::InvalidHandleError`]
+- [`windows::io::NullHandleError`]
+- [`windows::io::AsSocket`]
+- [`windows::io::BorrowedSocket<'handle>`]
+- [`windows::io::OwnedSocket`]
+- [`thread::scope`]
+- [`thread::Scope`]
+- [`thread::ScopedJoinHandle`]
+
+These APIs are now usable in const contexts:
+
+- [`array::from_ref`]
+- [`slice::from_ref`]
+- [`intrinsics::copy`]
+- [`intrinsics::copy_nonoverlapping`]
+- [`<*const T>::copy_to`]
+- [`<*const T>::copy_to_nonoverlapping`]
+- [`<*mut T>::copy_to`]
+- [`<*mut T>::copy_to_nonoverlapping`]
+- [`<*mut T>::copy_from`]
+- [`<*mut T>::copy_from_nonoverlapping`]
+- [`str::from_utf8`]
+- [`Utf8Error::error_len`]
+- [`Utf8Error::valid_up_to`]
+- [`Condvar::new`]
+- [`Mutex::new`]
+- [`RwLock::new`]
+
+Cargo
+-----
+- [Stabilize the `--config path` command-line argument.][cargo/10755]
+- [Expose rust-version in the environment as `CARGO_PKG_RUST_VERSION`.][cargo/10713]
+
+Compatibility Notes
+-------------------
+
+- [`#[link]` attributes are now checked more strictly,][96885] which may introduce
+ errors for invalid attribute arguments that were previously ignored.
+- [Rounding is now used when converting a float to a `Duration`.][96051] The converted
+ duration can differ slightly from what it was.
+
+Internal Changes
+----------------
+
+These changes provide no direct user facing benefits, but represent significant
+improvements to the internals and overall performance of rustc
+and related tools.
+
+- [Prepare Rust for LLVM opaque pointers.][94214]
+
+[94214]: https://github.com/rust-lang/rust/pull/94214/
+[94530]: https://github.com/rust-lang/rust/pull/94530/
+[94954]: https://github.com/rust-lang/rust/pull/94954/
+[95243]: https://github.com/rust-lang/rust/pull/95243/
+[95565]: https://github.com/rust-lang/rust/pull/95565/
+[95632]: https://github.com/rust-lang/rust/pull/95632/
+[95818]: https://github.com/rust-lang/rust/pull/95818/
+[95897]: https://github.com/rust-lang/rust/pull/95897/
+[95953]: https://github.com/rust-lang/rust/pull/95953/
+[96051]: https://github.com/rust-lang/rust/pull/96051/
+[96296]: https://github.com/rust-lang/rust/pull/96296/
+[96455]: https://github.com/rust-lang/rust/pull/96455/
+[96737]: https://github.com/rust-lang/rust/pull/96737/
+[96868]: https://github.com/rust-lang/rust/pull/96868/
+[96881]: https://github.com/rust-lang/rust/pull/96881/
+[96885]: https://github.com/rust-lang/rust/pull/96885/
+[96959]: https://github.com/rust-lang/rust/pull/96959/
+[97034]: https://github.com/rust-lang/rust/pull/97034/
+[97202]: https://github.com/rust-lang/rust/pull/97202/
+[97316]: https://github.com/rust-lang/rust/pull/97316/
+[97652]: https://github.com/rust-lang/rust/pull/97652/
+[97675]: https://github.com/rust-lang/rust/pull/97675/
+[97803]: https://github.com/rust-lang/rust/pull/97803/
+[97837]: https://github.com/rust-lang/rust/pull/97837/
+[97867]: https://github.com/rust-lang/rust/pull/97867/
+[cargo/10713]: https://github.com/rust-lang/cargo/pull/10713/
+[cargo/10755]: https://github.com/rust-lang/cargo/pull/10755/
+
+[`array::from_fn`]: https://doc.rust-lang.org/stable/std/array/fn.from_fn.html
+[`Box::into_pin`]: https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.into_pin
+[`BinaryHeap::try_reserve_exact`]: https://doc.rust-lang.org/stable/alloc/collections/binary_heap/struct.BinaryHeap.html#method.try_reserve_exact
+[`BinaryHeap::try_reserve`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.try_reserve
+[`OsString::try_reserve`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve
+[`OsString::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve_exact
+[`PathBuf::try_reserve`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve
+[`PathBuf::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve_exact
+[`Path::try_exists`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.try_exists
+[`Ref::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.Ref.html#method.filter_map
+[`RefMut::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.RefMut.html#method.filter_map
+[`NonNull::<slice>::len`]: https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.len
+[`ToOwned::clone_into`]: https://doc.rust-lang.org/stable/std/borrow/trait.ToOwned.html#method.clone_into
+[`Ipv6Addr::to_ipv4_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4_mapped
+[`unix::io::AsFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/trait.AsFd.html
+[`unix::io::BorrowedFd<'fd>`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.BorrowedFd.html
+[`unix::io::OwnedFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.OwnedFd.html
+[`windows::io::AsHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsHandle.html
+[`windows::io::BorrowedHandle<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedHandle.html
+[`windows::io::OwnedHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedHandle.html
+[`windows::io::HandleOrInvalid`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrInvalid.html
+[`windows::io::HandleOrNull`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrNull.html
+[`windows::io::InvalidHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.InvalidHandleError.html
+[`windows::io::NullHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.NullHandleError.html
+[`windows::io::AsSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsSocket.html
+[`windows::io::BorrowedSocket<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedSocket.html
+[`windows::io::OwnedSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedSocket.html
+[`thread::scope`]: https://doc.rust-lang.org/stable/std/thread/fn.scope.html
+[`thread::Scope`]: https://doc.rust-lang.org/stable/std/thread/struct.Scope.html
+[`thread::ScopedJoinHandle`]: https://doc.rust-lang.org/stable/std/thread/struct.ScopedJoinHandle.html
+
+[`array::from_ref`]: https://doc.rust-lang.org/stable/std/array/fn.from_ref.html
+[`slice::from_ref`]: https://doc.rust-lang.org/stable/std/slice/fn.from_ref.html
+[`intrinsics::copy`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy.html
+[`intrinsics::copy_nonoverlapping`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy_nonoverlapping.html
+[`<*const T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to
+[`<*const T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping
+[`<*mut T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to-1
+[`<*mut T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
+[`<*mut T>::copy_from`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from
+[`<*mut T>::copy_from_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from_nonoverlapping
+[`str::from_utf8`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8.html
+[`Utf8Error::error_len`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.error_len
+[`Utf8Error::valid_up_to`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.valid_up_to
+[`Condvar::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.new
+[`Mutex::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Mutex.html#method.new
+[`RwLock::new`]: https://doc.rust-lang.org/stable/std/sync/struct.RwLock.html#method.new
+
+Version 1.62.1 (2022-07-19)
+==========================
+
+Rust 1.62.1 addresses a few recent regressions in the compiler and standard
+library, and also mitigates a CPU vulnerability on Intel SGX.
+
+* [The compiler fixed unsound function coercions involving `impl Trait` return types.][98608]
+* [The compiler fixed an incremental compilation bug with `async fn` lifetimes.][98890]
+* [Windows added a fallback for overlapped I/O in synchronous reads and writes.][98950]
+* [The `x86_64-fortanix-unknown-sgx` target added a mitigation for the
+ MMIO stale data vulnerability][98126], advisory [INTEL-SA-00615].
+
+[98608]: https://github.com/rust-lang/rust/issues/98608
+[98890]: https://github.com/rust-lang/rust/issues/98890
+[98950]: https://github.com/rust-lang/rust/pull/98950
+[98126]: https://github.com/rust-lang/rust/pull/98126
+[INTEL-SA-00615]: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00615.html
+
+Version 1.62.0 (2022-06-30)
+==========================
+
+Language
+--------
+
+- [Stabilize `#[derive(Default)]` on enums with a `#[default]` variant][94457]
+- [Teach flow sensitive checks that visibly uninhabited call expressions never return][93313]
+- [Fix constants not getting dropped if part of a diverging expression][94775]
+- [Support unit struct/enum variant in destructuring assignment][95380]
+- [Remove mutable_borrow_reservation_conflict lint and allow the code pattern][96268]
+- [`const` functions may now specify `extern "C"` or `extern "Rust"`][95346]
+
+Compiler
+--------
+
+- [linker: Stop using whole-archive on dependencies of dylibs][96436]
+- [Make `unaligned_references` lint deny-by-default][95372]
+ This lint is also a future compatibility lint, and is expected to eventually
+ become a hard error.
+- [Only add codegen backend to dep info if -Zbinary-dep-depinfo is used][93969]
+- [Reject `#[thread_local]` attribute on non-static items][95006]
+- [Add tier 3 `aarch64-pc-windows-gnullvm` and `x86_64-pc-windows-gnullvm` targets\*][94872]
+- [Implement a lint to warn about unused macro rules][96150]
+- [Promote `x86_64-unknown-none` target to Tier 2\*][95705]
+
+\* Refer to Rust's [platform support page][platform-support-doc] for more
+ information on Rust's tiered platform support.
+
+Libraries
+---------
+
+- [Windows: Use a pipe relay for chaining pipes][95841]
+- [Replace Linux Mutex and Condvar with futex based ones.][95035]
+- [Replace RwLock by a futex based one on Linux][95801]
+- [std: directly use pthread in UNIX parker implementation][96393]
+
+Stabilized APIs
+---------------
+
+- [`bool::then_some`]
+- [`f32::total_cmp`]
+- [`f64::total_cmp`]
+- [`Stdin::lines`]
+- [`windows::CommandExt::raw_arg`]
+- [`impl<T: Default> Default for AssertUnwindSafe<T>`]
+- [`From<Rc<str>> for Rc<[u8]>`][rc-u8-from-str]
+- [`From<Arc<str>> for Arc<[u8]>`][arc-u8-from-str]
+- [`FusedIterator for EncodeWide`]
+- [RDM intrinsics on aarch64][stdarch/1285]
+
+Clippy
+------
+
+- [Create clippy lint against unexpectedly late drop for temporaries in match scrutinee expressions][94206]
+
+Cargo
+-----
+
+- Added the `cargo add` command for adding dependencies to `Cargo.toml` from
+ the command-line.
+ [docs](https://doc.rust-lang.org/nightly/cargo/commands/cargo-add.html)
+- Package ID specs now support `name@version` syntax in addition to the
+ previous `name:version` to align with the behavior in `cargo add` and other
+ tools. `cargo install` and `cargo yank` also now support this syntax so the
+ version does not need to passed as a separate flag.
+- The `git` and `registry` directories in Cargo's home directory (usually
+ `~/.cargo`) are now marked as cache directories so that they are not
+ included in backups or content indexing (on Windows).
+- Added automatic `@` argfile support, which will use "response files" if the
+ command-line to `rustc` exceeds the operating system's limit.
+
+Compatibility Notes
+-------------------
+
+- `cargo test` now passes `--target` to `rustdoc` if the specified target is
+ the same as the host target.
+ [#10594](https://github.com/rust-lang/cargo/pull/10594)
+- [rustdoc: doctests are now run on unexported `macro_rules!` macros, matching other private items][96630]
+- [rustdoc: Remove .woff font files][96279]
+- [Enforce Copy bounds for repeat elements while considering lifetimes][95819]
+- [Windows: Fix potential unsoundness by aborting if `File` reads or writes cannot
+ complete synchronously][95469].
+
+Internal Changes
+----------------
+
+- [Unify ReentrantMutex implementations across all platforms][96042]
+
+These changes provide no direct user facing benefits, but represent significant
+improvements to the internals and overall performance of rustc
+and related tools.
+
+[93313]: https://github.com/rust-lang/rust/pull/93313/
+[93969]: https://github.com/rust-lang/rust/pull/93969/
+[94206]: https://github.com/rust-lang/rust/pull/94206/
+[94457]: https://github.com/rust-lang/rust/pull/94457/
+[94775]: https://github.com/rust-lang/rust/pull/94775/
+[94872]: https://github.com/rust-lang/rust/pull/94872/
+[95006]: https://github.com/rust-lang/rust/pull/95006/
+[95035]: https://github.com/rust-lang/rust/pull/95035/
+[95346]: https://github.com/rust-lang/rust/pull/95346/
+[95372]: https://github.com/rust-lang/rust/pull/95372/
+[95380]: https://github.com/rust-lang/rust/pull/95380/
+[95431]: https://github.com/rust-lang/rust/pull/95431/
+[95469]: https://github.com/rust-lang/rust/pull/95469/
+[95705]: https://github.com/rust-lang/rust/pull/95705/
+[95801]: https://github.com/rust-lang/rust/pull/95801/
+[95819]: https://github.com/rust-lang/rust/pull/95819/
+[95841]: https://github.com/rust-lang/rust/pull/95841/
+[96042]: https://github.com/rust-lang/rust/pull/96042/
+[96150]: https://github.com/rust-lang/rust/pull/96150/
+[96268]: https://github.com/rust-lang/rust/pull/96268/
+[96279]: https://github.com/rust-lang/rust/pull/96279/
+[96393]: https://github.com/rust-lang/rust/pull/96393/
+[96436]: https://github.com/rust-lang/rust/pull/96436/
+[96557]: https://github.com/rust-lang/rust/pull/96557/
+[96630]: https://github.com/rust-lang/rust/pull/96630/
+
+[`bool::then_some`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then_some
+[`f32::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.total_cmp
+[`f64::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.total_cmp
+[`Stdin::lines`]: https://doc.rust-lang.org/stable/std/io/struct.Stdin.html#method.lines
+[`impl<T: Default> Default for AssertUnwindSafe<T>`]: https://doc.rust-lang.org/stable/std/panic/struct.AssertUnwindSafe.html#impl-Default
+[rc-u8-from-str]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#impl-From%3CRc%3Cstr%3E%3E
+[arc-u8-from-str]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#impl-From%3CArc%3Cstr%3E%3E
+[stdarch/1285]: https://github.com/rust-lang/stdarch/pull/1285
+[`windows::CommandExt::raw_arg`]: https://doc.rust-lang.org/stable/std/os/windows/process/trait.CommandExt.html#tymethod.raw_arg
+[`FusedIterator for EncodeWide`]: https://doc.rust-lang.org/stable/std/os/windows/ffi/struct.EncodeWide.html#impl-FusedIterator
+
+Version 1.61.0 (2022-05-19)
+==========================
+
+Language
+--------
+
+- [`const fn` signatures can now include generic trait bounds][93827]
+- [`const fn` signatures can now use `impl Trait` in argument and return position][93827]
+- [Function pointers can now be created, cast, and passed around in a `const fn`][93827]
+- [Recursive calls can now set the value of a function's opaque `impl Trait` return type][94081]
+
+Compiler
+--------
+
+- [Linking modifier syntax in `#[link]` attributes and on the command line, as well as the `whole-archive` modifier specifically, are now supported][93901]
+- [The `char` type is now described as UTF-32 in debuginfo][89887]
+- The [`#[target_feature]`][target_feature] attribute [can now be used with aarch64 features][90621]
+- X86 [`#[target_feature = "adx"]` is now stable][93745]
+
+Libraries
+---------
+
+- [`ManuallyDrop<T>` is now documented to have the same layout as `T`][88375]
+- [`#[ignore = "…"]` messages are printed when running tests][92714]
+- [Consistently show absent stdio handles on Windows as NULL handles][93263]
+- [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.
+- [`Vec::from_raw_parts` is now less restrictive about its inputs][95016]
+- [`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.
+
+Stabilized APIs
+---------------
+
+- [`Pin::static_mut`]
+- [`Pin::static_ref`]
+- [`Vec::retain_mut`]
+- [`VecDeque::retain_mut`]
+- [`Write` for `Cursor<[u8; N]>`][cursor-write-array]
+- [`std::os::unix::net::SocketAddr::from_pathname`]
+- [`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.
+- [`std::thread::JoinHandle::is_finished`]
+
+These APIs are now usable in const contexts:
+
+- [`<*const T>::offset` and `<*mut T>::offset`][ptr-offset]
+- [`<*const T>::wrapping_offset` and `<*mut T>::wrapping_offset`][ptr-wrapping_offset]
+- [`<*const T>::add` and `<*mut T>::add`][ptr-add]
+- [`<*const T>::sub` and `<*mut T>::sub`][ptr-sub]
+- [`<*const T>::wrapping_add` and `<*mut T>::wrapping_add`][ptr-wrapping_add]
+- [`<*const T>::wrapping_sub` and `<*mut T>::wrapping_sub`][ptr-wrapping_sub]
+- [`<[T]>::as_mut_ptr`][slice-as_mut_ptr]
+- [`<[T]>::as_ptr_range`][slice-as_ptr_range]
+- [`<[T]>::as_mut_ptr_range`][slice-as_mut_ptr_range]
+
+Cargo
+-----
+
+No feature changes, but see compatibility notes.
+
+Compatibility Notes
+-------------------
+
+- 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
+ - (more common) either be reordered to respect dependencies between them (if `a` depends on `b` then `a` should go first and `b` second)
+ - (less common) or be updated to use the [`+whole-archive`] modifier.
+- [Catching a second unwind from FFI code while cleaning up from a Rust panic now causes the process to abort][92911]
+- [Proc macros no longer see `ident` matchers wrapped in groups][92472]
+- [The number of `#` in `r#` raw string literals is now required to be less than 256][95251]
+- [When checking that a dyn type satisfies a trait bound, supertrait bounds are now enforced][92285]
+- [`cargo vendor` now only accepts one value for each `--sync` flag][cargo/10448]
+- [`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`.
+- [bootstrap: static-libstdcpp is now enabled by default, and can now be disabled when llvm-tools is enabled][94832]
+
+Internal Changes
+----------------
+
+These changes provide no direct user facing benefits, but represent significant
+improvements to the internals and overall performance of rustc
+and related tools.
+
+- [debuginfo: Refactor debuginfo generation for types][94261]
+- [Remove the everybody loops pass][93913]
+
+[88375]: https://github.com/rust-lang/rust/pull/88375/
+[89887]: https://github.com/rust-lang/rust/pull/89887/
+[90621]: https://github.com/rust-lang/rust/pull/90621/
+[92285]: https://github.com/rust-lang/rust/pull/92285/
+[92472]: https://github.com/rust-lang/rust/pull/92472/
+[92697]: https://github.com/rust-lang/rust/pull/92697/
+[92714]: https://github.com/rust-lang/rust/pull/92714/
+[92911]: https://github.com/rust-lang/rust/pull/92911/
+[93263]: https://github.com/rust-lang/rust/pull/93263/
+[93745]: https://github.com/rust-lang/rust/pull/93745/
+[93827]: https://github.com/rust-lang/rust/pull/93827/
+[93901]: https://github.com/rust-lang/rust/pull/93901/
+[93913]: https://github.com/rust-lang/rust/pull/93913/
+[93965]: https://github.com/rust-lang/rust/pull/93965/
+[94081]: https://github.com/rust-lang/rust/pull/94081/
+[94261]: https://github.com/rust-lang/rust/pull/94261/
+[94295]: https://github.com/rust-lang/rust/pull/94295/
+[94832]: https://github.com/rust-lang/rust/pull/94832/
+[95016]: https://github.com/rust-lang/rust/pull/95016/
+[95251]: https://github.com/rust-lang/rust/pull/95251/
+[`+whole-archive`]: https://doc.rust-lang.org/stable/rustc/command-line-arguments.html#linking-modifiers-whole-archive
+[`Pin::static_mut`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_mut
+[`Pin::static_ref`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_ref
+[`Vec::retain_mut`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.retain_mut
+[`VecDeque::retain_mut`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.retain_mut
+[`std::os::unix::net::SocketAddr::from_pathname`]: https://doc.rust-lang.org/stable/std/os/unix/net/struct.SocketAddr.html#method.from_pathname
+[`std::process::ExitCode`]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html
+[`std::process::Termination`]: https://doc.rust-lang.org/stable/std/process/trait.Termination.html
+[`std::thread::JoinHandle::is_finished`]: https://doc.rust-lang.org/stable/std/thread/struct.JoinHandle.html#method.is_finished
+[cargo/10448]: https://github.com/rust-lang/cargo/pull/10448/
+[cursor-write-array]: https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#impl-Write-4
+[link-attr]: https://doc.rust-lang.org/stable/reference/items/external-blocks.html#the-link-attribute
+[ptr-add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.add
+[ptr-offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset
+[ptr-sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.sub
+[ptr-wrapping_add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_add
+[ptr-wrapping_offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_offset
+[ptr-wrapping_sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_sub
+[slice-as_mut_ptr]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr
+[slice-as_mut_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr_range
+[slice-as_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_ptr_range
+[target_feature]: https://doc.rust-lang.org/reference/attributes/codegen.html#the-target_feature-attribute
+
+
+Version 1.60.0 (2022-04-07)
+==========================
+
+Language
+--------
+- [Stabilize `#[cfg(panic = "...")]` for either `"unwind"` or `"abort"`.][93658]
+- [Stabilize `#[cfg(target_has_atomic = "...")]` for each integer size and `"ptr"`.][93824]
+
+Compiler
+--------
+- [Enable combining `+crt-static` and `relocation-model=pic` on `x86_64-unknown-linux-gnu`][86374]
+- [Fixes wrong `unreachable_pub` lints on nested and glob public reexport][87487]
+- [Stabilize `-Z instrument-coverage` as `-C instrument-coverage`][90132]
+- [Stabilize `-Z print-link-args` as `--print link-args`][91606]
+- [Add new Tier 3 target `mips64-openwrt-linux-musl`\*][92300]
+- [Add new Tier 3 target `armv7-unknown-linux-uclibceabi` (softfloat)\*][92383]
+- [Fix invalid removal of newlines from doc comments][92357]
+- [Add kernel target for RustyHermit][92670]
+- [Deny mixing bin crate type with lib crate types][92933]
+- [Make rustc use `RUST_BACKTRACE=full` by default][93566]
+- [Upgrade to LLVM 14][93577]
+
+\* Refer to Rust's [platform support page][platform-support-doc] for more
+ information on Rust's tiered platform support.
+
+Libraries
+---------
+- [Guarantee call order for `sort_by_cached_key`][89621]
+- [Improve `Duration::try_from_secs_f32`/`f64` accuracy by directly processing exponent and mantissa][90247]
+- [Make `Instant::{duration_since, elapsed, sub}` saturating][89926]
+- [Remove non-monotonic clocks workarounds in `Instant::now`][89926]
+- [Make `BuildHasherDefault`, `iter::Empty` and `future::Pending` covariant][92630]
+
+Stabilized APIs
+---------------
+- [`Arc::new_cyclic`][arc_new_cyclic]
+- [`Rc::new_cyclic`][rc_new_cyclic]
+- [`slice::EscapeAscii`][slice_escape_ascii]
+- [`<[u8]>::escape_ascii`][slice_u8_escape_ascii]
+- [`u8::escape_ascii`][u8_escape_ascii]
+- [`Vec::spare_capacity_mut`][vec_spare_capacity_mut]
+- [`MaybeUninit::assume_init_drop`][assume_init_drop]
+- [`MaybeUninit::assume_init_read`][assume_init_read]
+- [`i8::abs_diff`][i8_abs_diff]
+- [`i16::abs_diff`][i16_abs_diff]
+- [`i32::abs_diff`][i32_abs_diff]
+- [`i64::abs_diff`][i64_abs_diff]
+- [`i128::abs_diff`][i128_abs_diff]
+- [`isize::abs_diff`][isize_abs_diff]
+- [`u8::abs_diff`][u8_abs_diff]
+- [`u16::abs_diff`][u16_abs_diff]
+- [`u32::abs_diff`][u32_abs_diff]
+- [`u64::abs_diff`][u64_abs_diff]
+- [`u128::abs_diff`][u128_abs_diff]
+- [`usize::abs_diff`][usize_abs_diff]
+- [`Display for io::ErrorKind`][display_error_kind]
+- [`From<u8> for ExitCode`][from_u8_exit_code]
+- [`Not for !` (the "never" type)][not_never]
+- [_Op_`Assign<$t> for Wrapping<$t>`][wrapping_assign_ops]
+- [`arch::is_aarch64_feature_detected!`][is_aarch64_feature_detected]
+
+Cargo
+-----
+- [Port cargo from `toml-rs` to `toml_edit`][cargo/10086]
+- [Stabilize `-Ztimings` as `--timings`][cargo/10245]
+- [Stabilize namespaced and weak dependency features.][cargo/10269]
+- [Accept more `cargo:rustc-link-arg-*` types from build script output.][cargo/10274]
+- [cargo-new should not add ignore rule on Cargo.lock inside subdirs][cargo/10379]
+
+Misc
+----
+- [Ship docs on Tier 2 platforms by reusing the closest Tier 1 platform docs][92800]
+- [Drop rustc-docs from complete profile][93742]
+- [bootstrap: tidy up flag handling for llvm build][93918]
+
+Compatibility Notes
+-------------------
+- [Remove compiler-rt linking hack on Android][83822]
+- [Mitigations for platforms with non-monotonic clocks have been removed from
+ `Instant::now`][89926]. On platforms that don't provide monotonic clocks, an
+ instant is not guaranteed to be greater than an earlier instant anymore.
+- [`Instant::{duration_since, elapsed, sub}` do not panic anymore on underflow,
+ saturating to `0` instead][89926]. In the real world the panic happened mostly
+ on platforms with buggy monotonic clock implementations rather than catching
+ programming errors like reversing the start and end times. Such programming
+ errors will now results in `0` rather than a panic.
+- In a future release we're planning to increase the baseline requirements for
+ the Linux kernel to version 3.2, and for glibc to version 2.17. We'd love
+ your feedback in [PR #95026][95026].
+
+Internal Changes
+----------------
+
+These changes provide no direct user facing benefits, but represent significant
+improvements to the internals and overall performance of rustc
+and related tools.
+
+- [Switch all libraries to the 2021 edition][92068]
+
+[83822]: https://github.com/rust-lang/rust/pull/83822
+[86374]: https://github.com/rust-lang/rust/pull/86374
+[87487]: https://github.com/rust-lang/rust/pull/87487
+[89621]: https://github.com/rust-lang/rust/pull/89621
+[89926]: https://github.com/rust-lang/rust/pull/89926
+[90132]: https://github.com/rust-lang/rust/pull/90132
+[90247]: https://github.com/rust-lang/rust/pull/90247
+[91606]: https://github.com/rust-lang/rust/pull/91606
+[92068]: https://github.com/rust-lang/rust/pull/92068
+[92300]: https://github.com/rust-lang/rust/pull/92300
+[92357]: https://github.com/rust-lang/rust/pull/92357
+[92383]: https://github.com/rust-lang/rust/pull/92383
+[92630]: https://github.com/rust-lang/rust/pull/92630
+[92670]: https://github.com/rust-lang/rust/pull/92670
+[92800]: https://github.com/rust-lang/rust/pull/92800
+[92933]: https://github.com/rust-lang/rust/pull/92933
+[93566]: https://github.com/rust-lang/rust/pull/93566
+[93577]: https://github.com/rust-lang/rust/pull/93577
+[93658]: https://github.com/rust-lang/rust/pull/93658
+[93742]: https://github.com/rust-lang/rust/pull/93742
+[93824]: https://github.com/rust-lang/rust/pull/93824
+[93918]: https://github.com/rust-lang/rust/pull/93918
+[95026]: https://github.com/rust-lang/rust/pull/95026
+
+[cargo/10086]: https://github.com/rust-lang/cargo/pull/10086
+[cargo/10245]: https://github.com/rust-lang/cargo/pull/10245
+[cargo/10269]: https://github.com/rust-lang/cargo/pull/10269
+[cargo/10274]: https://github.com/rust-lang/cargo/pull/10274
+[cargo/10379]: https://github.com/rust-lang/cargo/pull/10379
+
+[arc_new_cyclic]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.new_cyclic
+[rc_new_cyclic]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.new_cyclic
+[slice_escape_ascii]: https://doc.rust-lang.org/stable/std/slice/struct.EscapeAscii.html
+[slice_u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.escape_ascii
+[u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.escape_ascii
+[vec_spare_capacity_mut]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.spare_capacity_mut
+[assume_init_drop]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_drop
+[assume_init_read]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_read
+[i8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.abs_diff
+[i16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.abs_diff
+[i32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.abs_diff
+[i64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.abs_diff
+[i128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.abs_diff
+[isize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.abs_diff
+[u8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.abs_diff
+[u16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.abs_diff
+[u32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.abs_diff
+[u64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.abs_diff
+[u128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.abs_diff
+[usize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.abs_diff
+[display_error_kind]: https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#impl-Display
+[from_u8_exit_code]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html#impl-From%3Cu8%3E
+[not_never]: https://doc.rust-lang.org/stable/std/primitive.never.html#impl-Not
+[wrapping_assign_ops]: https://doc.rust-lang.org/stable/std/num/struct.Wrapping.html#trait-implementations
+[is_aarch64_feature_detected]: https://doc.rust-lang.org/stable/std/arch/macro.is_aarch64_feature_detected.html
+
+Version 1.59.0 (2022-02-24)
+==========================
+
+Language
+--------
+
+- [Stabilize default arguments for const parameters and remove the ordering restriction for type and const parameters][90207]
+- [Stabilize destructuring assignment][90521]
+- [Relax private in public lint on generic bounds and where clauses of trait impls][90586]
+- [Stabilize asm! and global_asm! for x86, x86_64, ARM, Aarch64, and RISC-V][91728]
+
+Compiler
+--------
+
+- [Stabilize new symbol mangling format, leaving it opt-in (-Csymbol-mangling-version=v0)][90128]
+- [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
+- [Fix sparc64 ABI for aggregates with floating point members][91003]
+- [Warn when a `#[test]`-like built-in attribute macro is present multiple times.][91172]
+- [Add support for riscv64gc-unknown-freebsd][91284]
+- [Stabilize `-Z emit-future-incompat` as `--json future-incompat`][91535]
+- [Soft disable incremental compilation][94124]
+
+This release disables incremental compilation, unless the user has explicitly
+opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
+This is due to a known and relatively frequently occurring bug in incremental
+compilation, which causes builds to issue internal compiler errors. This
+particular bug is already fixed on nightly, but that fix has not yet rolled out
+to stable and is deemed too risky for a direct stable backport.
+
+As always, we encourage users to test with nightly and report bugs so that we
+can track failures and fix issues earlier.
+
+See [94124] for more details.
+
+[94124]: https://github.com/rust-lang/rust/issues/94124
+
+Libraries
+---------
+
+- [Remove unnecessary bounds for some Hash{Map,Set} methods][91593]
+
+Stabilized APIs
+---------------
+
+- [`std::thread::available_parallelism`][available_parallelism]
+- [`Result::copied`][result-copied]
+- [`Result::cloned`][result-cloned]
+- [`arch::asm!`][asm]
+- [`arch::global_asm!`][global_asm]
+- [`ops::ControlFlow::is_break`][is_break]
+- [`ops::ControlFlow::is_continue`][is_continue]
+- [`TryFrom<char> for u8`][try_from_char_u8]
+- [`char::TryFromCharError`][try_from_char_err]
+ implementing `Clone`, `Debug`, `Display`, `PartialEq`, `Copy`, `Eq`, `Error`
+- [`iter::zip`][zip]
+- [`NonZeroU8::is_power_of_two`][is_power_of_two8]
+- [`NonZeroU16::is_power_of_two`][is_power_of_two16]
+- [`NonZeroU32::is_power_of_two`][is_power_of_two32]
+- [`NonZeroU64::is_power_of_two`][is_power_of_two64]
+- [`NonZeroU128::is_power_of_two`][is_power_of_two128]
+- [`NonZeroUsize::is_power_of_two`][is_power_of_two_usize]
+- [`DoubleEndedIterator for ToLowercase`][lowercase]
+- [`DoubleEndedIterator for ToUppercase`][uppercase]
+- [`TryFrom<&mut [T]> for [T; N]`][tryfrom_ref_arr]
+- [`UnwindSafe for Once`][unwindsafe_once]
+- [`RefUnwindSafe for Once`][refunwindsafe_once]
+- [armv8 neon intrinsics for aarch64][stdarch/1266]
+
+Const-stable:
+
+- [`mem::MaybeUninit::as_ptr`][muninit_ptr]
+- [`mem::MaybeUninit::assume_init`][muninit_init]
+- [`mem::MaybeUninit::assume_init_ref`][muninit_init_ref]
+- [`ffi::CStr::from_bytes_with_nul_unchecked`][cstr_from_bytes]
+
+Cargo
+-----
+
+- [Stabilize the `strip` profile option][cargo/10088]
+- [Stabilize future-incompat-report][cargo/10165]
+- [Support abbreviating `--release` as `-r`][cargo/10133]
+- [Support `term.quiet` configuration][cargo/10152]
+- [Remove `--host` from cargo {publish,search,login}][cargo/10145]
+
+Compatibility Notes
+-------------------
+
+- [Refactor weak symbols in std::sys::unix][90846]
+ This may add new, versioned, symbols when building with a newer glibc, as the
+ standard library uses weak linkage rather than dynamically attempting to load
+ certain symbols at runtime.
+- [Deprecate crate_type and crate_name nested inside `#![cfg_attr]`][83744]
+ This adds a future compatibility lint to supporting the use of cfg_attr
+ wrapping either crate_type or crate_name specification within Rust files;
+ it is recommended that users migrate to setting the equivalent command line
+ flags.
+- [Remove effect of `#[no_link]` attribute on name resolution][92034]
+ This may expose new names, leading to conflicts with preexisting names in a
+ given namespace and a compilation failure.
+- [Cargo will document libraries before binaries.][cargo/10172]
+- [Respect doc=false in dependencies, not just the root crate][cargo/10201]
+- [Weaken guarantee around advancing underlying iterators in zip][83791]
+- [Make split_inclusive() on an empty slice yield an empty output][89825]
+- [Update std::env::temp_dir to use GetTempPath2 on Windows when available.][89999]
+- [unreachable! was updated to match other formatting macro behavior on Rust 2021][92137]
+
+Internal Changes
+----------------
+
+These changes provide no direct user facing benefits, but represent significant
+improvements to the internals and overall performance of rustc
+and related tools.
+
+- [Fix many cases of normalization-related ICEs][91255]
+- [Replace dominators algorithm with simple Lengauer-Tarjan][85013]
+- [Store liveness in interval sets for region inference][90637]
+
+- [Remove `in_band_lifetimes` from the compiler and standard library, in preparation for removing this
+ unstable feature.][91867]
+
+[91867]: https://github.com/rust-lang/rust/issues/91867
+[83744]: https://github.com/rust-lang/rust/pull/83744/
+[83791]: https://github.com/rust-lang/rust/pull/83791/
+[85013]: https://github.com/rust-lang/rust/pull/85013/
+[89825]: https://github.com/rust-lang/rust/pull/89825/
+[89999]: https://github.com/rust-lang/rust/pull/89999/
+[90128]: https://github.com/rust-lang/rust/pull/90128/
+[90207]: https://github.com/rust-lang/rust/pull/90207/
+[90521]: https://github.com/rust-lang/rust/pull/90521/
+[90586]: https://github.com/rust-lang/rust/pull/90586/
+[90637]: https://github.com/rust-lang/rust/pull/90637/
+[90833]: https://github.com/rust-lang/rust/pull/90833/
+[90846]: https://github.com/rust-lang/rust/pull/90846/
+[91003]: https://github.com/rust-lang/rust/pull/91003/
+[91172]: https://github.com/rust-lang/rust/pull/91172/
+[91255]: https://github.com/rust-lang/rust/pull/91255/
+[91284]: https://github.com/rust-lang/rust/pull/91284/
+[91535]: https://github.com/rust-lang/rust/pull/91535/
+[91593]: https://github.com/rust-lang/rust/pull/91593/
+[91728]: https://github.com/rust-lang/rust/pull/91728/
+[91878]: https://github.com/rust-lang/rust/pull/91878/
+[91896]: https://github.com/rust-lang/rust/pull/91896/
+[91926]: https://github.com/rust-lang/rust/pull/91926/
+[91984]: https://github.com/rust-lang/rust/pull/91984/
+[92020]: https://github.com/rust-lang/rust/pull/92020/
+[92034]: https://github.com/rust-lang/rust/pull/92034/
+[92137]: https://github.com/rust-lang/rust/pull/92137/
+[92483]: https://github.com/rust-lang/rust/pull/92483/
+[cargo/10088]: https://github.com/rust-lang/cargo/pull/10088/
+[cargo/10133]: https://github.com/rust-lang/cargo/pull/10133/
+[cargo/10145]: https://github.com/rust-lang/cargo/pull/10145/
+[cargo/10152]: https://github.com/rust-lang/cargo/pull/10152/
+[cargo/10165]: https://github.com/rust-lang/cargo/pull/10165/
+[cargo/10172]: https://github.com/rust-lang/cargo/pull/10172/
+[cargo/10201]: https://github.com/rust-lang/cargo/pull/10201/
+[cargo/10269]: https://github.com/rust-lang/cargo/pull/10269/
+
+[cstr_from_bytes]: https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked
+[muninit_ptr]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
+[muninit_init]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
+[muninit_init_ref]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
+[unwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-UnwindSafe
+[refunwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-RefUnwindSafe
+[tryfrom_ref_arr]: https://doc.rust-lang.org/stable/std/convert/trait.TryFrom.html#impl-TryFrom%3C%26%27_%20mut%20%5BT%5D%3E
+[lowercase]: https://doc.rust-lang.org/stable/std/char/struct.ToLowercase.html#impl-DoubleEndedIterator
+[uppercase]: https://doc.rust-lang.org/stable/std/char/struct.ToUppercase.html#impl-DoubleEndedIterator
+[try_from_char_err]: https://doc.rust-lang.org/stable/std/char/struct.TryFromCharError.html
+[available_parallelism]: https://doc.rust-lang.org/stable/std/thread/fn.available_parallelism.html
+[result-copied]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.copied
+[result-cloned]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.cloned
+[asm]: https://doc.rust-lang.org/stable/core/arch/macro.asm.html
+[global_asm]: https://doc.rust-lang.org/stable/core/arch/macro.global_asm.html
+[is_break]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_break
+[is_continue]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_continue
+[try_from_char_u8]: https://doc.rust-lang.org/stable/std/primitive.char.html#impl-TryFrom%3Cchar%3E
+[zip]: https://doc.rust-lang.org/stable/std/iter/fn.zip.html
+[is_power_of_two8]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU8.html#method.is_power_of_two
+[is_power_of_two16]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU16.html#method.is_power_of_two
+[is_power_of_two32]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU32.html#method.is_power_of_two
+[is_power_of_two64]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU64.html#method.is_power_of_two
+[is_power_of_two128]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU128.html#method.is_power_of_two
+[is_power_of_two_usize]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroUsize.html#method.is_power_of_two
+[stdarch/1266]: https://github.com/rust-lang/stdarch/pull/1266
+
+Version 1.58.1 (2022-01-20)
+===========================
+
+* Fix race condition in `std::fs::remove_dir_all` ([CVE-2022-21658])
+* [Handle captured arguments in the `useless_format` Clippy lint][clippy/8295]
+* [Move `non_send_fields_in_send_ty` Clippy lint to nursery][clippy/8075]
+* [Fix wrong error message displayed when some imports are missing][91254]
+* [Fix rustfmt not formatting generated files from stdin][92912]
+
+[CVE-2022-21658]: https://www.cve.org/CVERecord?id=CVE-2022-21658
+[91254]: https://github.com/rust-lang/rust/pull/91254
+[92912]: https://github.com/rust-lang/rust/pull/92912
+[clippy/8075]: https://github.com/rust-lang/rust-clippy/pull/8075
+[clippy/8295]: https://github.com/rust-lang/rust-clippy/pull/8295
+
+Version 1.58.0 (2022-01-13)
+==========================
+
+Language
+--------
+
+- [Format strings can now capture arguments simply by writing `{ident}` in the string.][90473] This works in all macros accepting format strings. Support for this in `panic!` (`panic!("{ident}")`) requires the 2021 edition; panic invocations in previous editions that appear to be trying to use this will result in a warning lint about not having the intended effect.
+- [`*const T` pointers can now be dereferenced in const contexts.][89551]
+- [The rules for when a generic struct implements `Unsize` have been relaxed.][90417]
+
+Compiler
+--------
+
+- [Add LLVM CFI support to the Rust compiler][89652]
+- [Stabilize -Z strip as -C strip][90058]. Note that while release builds already don't add debug symbols for the code you compile, the compiled standard library that ships with Rust includes debug symbols, so you may want to use the `strip` option to remove these symbols to produce smaller release binaries. Note that this release only includes support in rustc, not directly in cargo.
+- [Add support for LLVM coverage mapping format versions 5 and 6][91207]
+- [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
+- [Update the minimum external LLVM to 12][90175]
+- [Add `x86_64-unknown-none` at Tier 3*][89062]
+- [Build musl dist artifacts with debuginfo enabled][90733]. When building release binaries using musl, you may want to use the newly stabilized strip option to remove these debug symbols, reducing the size of your binaries.
+- [Don't abort compilation after giving a lint error][87337]
+- [Error messages point at the source of trait bound obligations in more places][89580]
+
+\* Refer to Rust's [platform support page][platform-support-doc] for more
+ information on Rust's tiered platform support.
+
+Libraries
+---------
+
+- [All remaining functions in the standard library have `#[must_use]` annotations where appropriate][89692], producing a warning when ignoring their return value. This helps catch mistakes such as expecting a function to mutate a value in place rather than return a new value.
+- [Paths are automatically canonicalized on Windows for operations that support it][89174]
+- [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041]
+- [Implement `RefUnwindSafe` for `Rc<T>`][87467]
+- [Make RSplit<T, P>: Clone not require T: Clone][90117]
+- [Implement `Termination` for `Result<Infallible, E>`][88601]. This allows writing `fn main() -> Result<Infallible, ErrorType>`, for a program whose successful exits never involve returning from `main` (for instance, a program that calls `exit`, or that uses `exec` to run another program).
+
+Stabilized APIs
+---------------
+
+- [`Metadata::is_symlink`]
+- [`Path::is_symlink`]
+- [`{integer}::saturating_div`]
+- [`Option::unwrap_unchecked`]
+- [`Result::unwrap_unchecked`]
+- [`Result::unwrap_err_unchecked`]
+- [`File::options`]
+
+These APIs are now usable in const contexts:
+
+- [`Duration::new`]
+- [`Duration::checked_add`]
+- [`Duration::saturating_add`]
+- [`Duration::checked_sub`]
+- [`Duration::saturating_sub`]
+- [`Duration::checked_mul`]
+- [`Duration::saturating_mul`]
+- [`Duration::checked_div`]
+
+Cargo
+-----
+
+- [Add --message-format for install command][cargo/10107]
+- [Warn when alias shadows external subcommand][cargo/10082]
+
+Rustdoc
+-------
+
+- [Show all Deref implementations recursively in rustdoc][90183]
+- [Use computed visibility in rustdoc][88447]
+
+Compatibility Notes
+-------------------
+
+- [Try all stable method candidates first before trying unstable ones][90329]. This change ensures that adding new nightly-only methods to the Rust standard library will not break code invoking methods of the same name from traits outside the standard library.
+- Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
+- [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
+- [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
+- [Refactor weak symbols in std::sys::unix][90846]. This optimizes accesses to glibc functions, by avoiding the use of dlopen. This does not increase the [minimum expected version of glibc](https://doc.rust-lang.org/nightly/rustc/platform-support.html). However, software distributions that use symbol versions to detect library dependencies, and which take weak symbols into account in that analysis, may detect rust binaries as requiring newer versions of glibc.
+- [rustdoc now rejects some unexpected semicolons in doctests][91026]
+
+Internal Changes
+----------------
+
+These changes provide no direct user facing benefits, but represent significant
+improvements to the internals and overall performance of rustc
+and related tools.
+
+- [Implement coherence checks for negative trait impls][90104]
+- [Add rustc lint, warning when iterating over hashmaps][89558]
+- [Optimize live point computation][90491]
+- [Enable verification for 1/32nd of queries loaded from disk][90361]
+- [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
+
+[87337]: https://github.com/rust-lang/rust/pull/87337/
+[87467]: https://github.com/rust-lang/rust/pull/87467/
+[87704]: https://github.com/rust-lang/rust/pull/87704/
+[88041]: https://github.com/rust-lang/rust/pull/88041/
+[88447]: https://github.com/rust-lang/rust/pull/88447/
+[88601]: https://github.com/rust-lang/rust/pull/88601/
+[89062]: https://github.com/rust-lang/rust/pull/89062/
+[89174]: https://github.com/rust-lang/rust/pull/89174/
+[89551]: https://github.com/rust-lang/rust/pull/89551/
+[89558]: https://github.com/rust-lang/rust/pull/89558/
+[89580]: https://github.com/rust-lang/rust/pull/89580/
+[89652]: https://github.com/rust-lang/rust/pull/89652/
+[90041]: https://github.com/rust-lang/rust/pull/90041/
+[90058]: https://github.com/rust-lang/rust/pull/90058/
+[90104]: https://github.com/rust-lang/rust/pull/90104/
+[90117]: https://github.com/rust-lang/rust/pull/90117/
+[90175]: https://github.com/rust-lang/rust/pull/90175/
+[90183]: https://github.com/rust-lang/rust/pull/90183/
+[90297]: https://github.com/rust-lang/rust/pull/90297/
+[90329]: https://github.com/rust-lang/rust/pull/90329/
+[90361]: https://github.com/rust-lang/rust/pull/90361/
+[90417]: https://github.com/rust-lang/rust/pull/90417/
+[90473]: https://github.com/rust-lang/rust/pull/90473/
+[90491]: https://github.com/rust-lang/rust/pull/90491/
+[90733]: https://github.com/rust-lang/rust/pull/90733/
+[90833]: https://github.com/rust-lang/rust/pull/90833/
+[90846]: https://github.com/rust-lang/rust/pull/90846/
+[91026]: https://github.com/rust-lang/rust/pull/91026/
+[91207]: https://github.com/rust-lang/rust/pull/91207/
+[91255]: https://github.com/rust-lang/rust/pull/91255/
+[cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
+[cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
+[`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
+[`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
+[`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
+[`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
+[`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked
+[`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked
+[`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options
+[`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new
+
+Version 1.57.0 (2021-12-02)
+==========================
+
+Language
+--------
+
+- [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
+- [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
+- [Allow panicking in constant evaluation.][89508]
+- [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
+
+Compiler
+--------
+
+- [Create more accurate debuginfo for vtables.][89597]
+- [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
+- [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
+- [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
+- [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
+
+\* Refer to Rust's [platform support page][platform-support-doc] for more
+ information on Rust's tiered platform support.
+
+Libraries
+---------
+
+- [Avoid allocations and copying in `Vec::leak`][89337]
+- [Add `#[repr(i8)]` to `Ordering`][89507]
+- [Optimize `File::read_to_end` and `read_to_string`][89582]
+- [Update to Unicode 14.0][89614]
+- [Many more functions are marked `#[must_use]`][89692], producing a warning
+ when ignoring their return value. This helps catch mistakes such as expecting
+ a function to mutate a value in place rather than return a new value.
+
+Stabilised APIs
+---------------
+
+- [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
+- [`[T; N]::as_slice`][`array::as_slice`]
+- [`collections::TryReserveError`]
+- [`HashMap::try_reserve`]
+- [`HashSet::try_reserve`]
+- [`String::try_reserve`]
+- [`String::try_reserve_exact`]
+- [`Vec::try_reserve`]
+- [`Vec::try_reserve_exact`]
+- [`VecDeque::try_reserve`]
+- [`VecDeque::try_reserve_exact`]
+- [`Iterator::map_while`]
+- [`iter::MapWhile`]
+- [`proc_macro::is_available`]
+- [`Command::get_program`]
+- [`Command::get_args`]
+- [`Command::get_envs`]
+- [`Command::get_current_dir`]
+- [`CommandArgs`]
+- [`CommandEnvs`]
+
+These APIs are now usable in const contexts:
+
+- [`hint::unreachable_unchecked`]
+
+Cargo
+-----
+
+- [Stabilize custom profiles][cargo/9943]
+
+Compatibility notes
+-------------------
+
+- [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
+ This will break some builds that set `#![deny(dead_code)]`.
+
+Internal changes
+----------------
+These changes provide no direct user facing benefits, but represent significant
+improvements to the internals and overall performance of rustc
+and related tools.
+
+- [Added an experimental backend for codegen with `libgccjit`.][87260]
+
+[85200]: https://github.com/rust-lang/rust/pull/85200/
+[86191]: https://github.com/rust-lang/rust/pull/86191/
+[87220]: https://github.com/rust-lang/rust/pull/87220/
+[87260]: https://github.com/rust-lang/rust/pull/87260/
+[88321]: https://github.com/rust-lang/rust/pull/88321/
+[88529]: https://github.com/rust-lang/rust/pull/88529/
+[88690]: https://github.com/rust-lang/rust/pull/88690/
+[88952]: https://github.com/rust-lang/rust/pull/88952/
+[89337]: https://github.com/rust-lang/rust/pull/89337/
+[89507]: https://github.com/rust-lang/rust/pull/89507/
+[89508]: https://github.com/rust-lang/rust/pull/89508/
+[89582]: https://github.com/rust-lang/rust/pull/89582/
+[89597]: https://github.com/rust-lang/rust/pull/89597/
+[89614]: https://github.com/rust-lang/rust/pull/89614/
+[89692]: https://github.com/rust-lang/rust/issues/89692/
+[cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
+[`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
+[`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
+[`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
+[`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
+[`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
+[`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
+[`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
+[`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
+[`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
+[`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
+[`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
+[`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
+[`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
+[`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
+[`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
+[`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
+[`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
+[`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
+[`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
+[`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
+
+Version 1.56.1 (2021-11-01)
+===========================
+
+- New lints to detect the presence of bidirectional-override Unicode
+ codepoints in the compiled source code ([CVE-2021-42574])
+
+[CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
+
+Version 1.56.0 (2021-10-21)
+========================
+
+Language
+--------
+
+- [The 2021 Edition is now stable.][rust#88100]
+ See [the edition guide][rust-2021-edition-guide] for more details.
+- [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
+- [Union field access is permitted in `const fn`.][rust#85769]
+
+[rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
+
+Compiler
+--------
+
+- [Upgrade to LLVM 13.][rust#87570]
+- [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
+- [Allow specifying a deployment target version for all iOS targets][rust#87699]
+- [Warnings can be forced on with `--force-warn`.][rust#87472]
+ This feature is primarily intended for usage by `cargo fix`, rather than end users.
+- [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
+- [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
+- [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
+
+\* Refer to Rust's [platform support page][platform-support-doc] for more
+information on Rust's tiered platform support.
+
+Libraries
+---------
+
+- [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
+ The Windows console still requires valid Unicode, but this change allows
+ splitting a UTF-8 character across multiple write calls. This allows, for
+ instance, programs that just read and write data buffers (e.g. copying a file
+ to stdout) without regard for Unicode or character boundaries.
+- [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
+ For this use case, atomics scale much better under contention.
+- [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
+- [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
+- [`impl From<[(K, V); N]>` for all collections.][rust#84111]
+- [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
+- [Treat invalid environment variable names as nonexistent.][rust#86183]
+ Previously, the environment functions would panic if given a variable name
+ with an internal null character or equal sign (`=`). Now, these functions will
+ just treat such names as nonexistent variables, since the OS cannot represent
+ the existence of a variable with such a name.
+
+Stabilised APIs
+---------------
+
+- [`std::os::unix::fs::chroot`]
+- [`UnsafeCell::raw_get`]
+- [`BufWriter::into_parts`]
+- [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
+ These APIs were previously stable in `std`, but are now also available in `core`.
+- [`Vec::shrink_to`]
+- [`String::shrink_to`]
+- [`OsString::shrink_to`]
+- [`PathBuf::shrink_to`]
+- [`BinaryHeap::shrink_to`]
+- [`VecDeque::shrink_to`]
+- [`HashMap::shrink_to`]
+- [`HashSet::shrink_to`]
+
+These APIs are now usable in const contexts:
+
+- [`std::mem::transmute`]
+- [`[T]::first`][`slice::first`]
+- [`[T]::split_first`][`slice::split_first`]
+- [`[T]::last`][`slice::last`]
+- [`[T]::split_last`][`slice::split_last`]
+
+Cargo
+-----
+
+- [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
+ This has no effect at present on dependency version selection.
+ We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
+ that support Rust code to include a crate's specified minimum version in the test matrix for that
+ crate by default.
+
+Compatibility notes
+-------------------
+
+- [Update to new argument parsing rules on Windows.][rust#87580]
+ This adjusts Rust's standard library to match the behavior of the standard
+ libraries for C/C++. The rules have changed slightly over time, and this PR
+ brings us to the latest set of rules (changed in 2008).
+- [Disallow the aapcs calling convention on aarch64][rust#88399]
+ This was already not supported by LLVM; this change surfaces this lack of
+ support with a better error message.
+- [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
+- [Warn when an escaped newline skips multiple lines.][rust#87671]
+- [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
+ may return different values on glibc <= 2.24.][rust#81825]
+ Rust now invokes the `clone3` system call directly, when available, to use new functionality
+ available via that system call. Older versions of glibc cache the result of `getpid`, and only
+ update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
+ that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
+
+Internal changes
+----------------
+These changes provide no direct user facing benefits, but represent significant
+improvements to the internals and overall performance of rustc
+and related tools.
+
+- [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
+ This improves the performance of most Rust builds.
+- [Unify representation of macros in internal data structures.][rust#88019]
+ This change fixes a host of bugs with the handling of macros by the compiler,
+ as well as rustdoc.
+
+[`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
+[`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
+[`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
+[`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
+[`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
+[`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
+[`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
+[`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
+[`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
+[`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
+[`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
+[`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
+[`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
+[`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
+[`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
+[`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
+[`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
+[`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
+[rust#87671]: https://github.com/rust-lang/rust/pull/87671
+[rust#86183]: https://github.com/rust-lang/rust/pull/86183
+[rust#87385]: https://github.com/rust-lang/rust/pull/87385
+[rust#88100]: https://github.com/rust-lang/rust/pull/88100
+[rust#85305]: https://github.com/rust-lang/rust/pull/85305
+[rust#88069]: https://github.com/rust-lang/rust/pull/88069
+[rust#87472]: https://github.com/rust-lang/rust/pull/87472
+[rust#87699]: https://github.com/rust-lang/rust/pull/87699
+[rust#87570]: https://github.com/rust-lang/rust/pull/87570
+[rust#88023]: https://github.com/rust-lang/rust/pull/88023
+[rust#87760]: https://github.com/rust-lang/rust/pull/87760
+[rust#87370]: https://github.com/rust-lang/rust/pull/87370
+[rust#87580]: https://github.com/rust-lang/rust/pull/87580
+[rust#83342]: https://github.com/rust-lang/rust/pull/83342
+[rust#83093]: https://github.com/rust-lang/rust/pull/83093
+[rust#85835]: https://github.com/rust-lang/rust/pull/85835
+[rust#86744]: https://github.com/rust-lang/rust/pull/86744
+[rust#81363]: https://github.com/rust-lang/rust/pull/81363
+[rust#84111]: https://github.com/rust-lang/rust/pull/84111
+[rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
+[rust#88399]: https://github.com/rust-lang/rust/pull/88399
+[rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
+[rust#88019]: https://github.com/rust-lang/rust/pull/88019
+[rust#87666]: https://github.com/rust-lang/rust/pull/87666
+
+Version 1.55.0 (2021-09-09)
+============================
+
+Language
+--------
+- [You can now write open "from" range patterns (`X..`), which will start at `X` and
+ will end at the maximum value of the integer.][83918]
+- [You can now explicitly import the prelude of different editions
+ through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
+
+Compiler
+--------
+- [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
+
+\* Refer to Rust's [platform support page][platform-support-doc] for more
+ information on Rust's tiered platform support.
+
+Libraries
+---------
+
+- [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
+ These improvements should in general provide faster string parsing of floats,
+ no longer reject certain valid floating point values, and reduce
+ the produced code size for non-stripped artifacts.
+- [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
+
+Stabilised APIs
+---------------
+
+- [`Bound::cloned`]
+- [`Drain::as_str`]
+- [`IntoInnerError::into_error`]
+- [`IntoInnerError::into_parts`]
+- [`MaybeUninit::assume_init_mut`]
+- [`MaybeUninit::assume_init_ref`]
+- [`MaybeUninit::write`]
+- [`array::map`]
+- [`ops::ControlFlow`]
+- [`x86::_bittest`]
+- [`x86::_bittestandcomplement`]
+- [`x86::_bittestandreset`]
+- [`x86::_bittestandset`]
+- [`x86_64::_bittest64`]
+- [`x86_64::_bittestandcomplement64`]
+- [`x86_64::_bittestandreset64`]
+- [`x86_64::_bittestandset64`]
+
+The following previously stable functions are now `const`.
+
+- [`str::from_utf8_unchecked`]
+
+
+Cargo
+-----
+- [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
+ rustc in parallel such as when using `cargo test`.][cargo/9675]
+- [The package definition in `cargo metadata` now includes the `"default_run"`
+ field from the manifest.][cargo/9550]
+- [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
+- [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
+ of packages.][cargo/9663]
+
+Rustdoc
+-------
+- [Added "Go to item on exact match" search option.][85876]
+- [The "Implementors" section on traits no longer shows redundant
+ method definitions.][85970]
+- [Trait implementations are toggled open by default.][86260] This should make the
+ implementations more searchable by tools like `CTRL+F` in your browser.
+- [Intra-doc links should now correctly resolve associated items (e.g. methods)
+ through type aliases.][86334]
+- [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
+ "Trait Implementations" section.][86513]
+
+
+Compatibility Notes
+-------------------
+- [std functions that return an `io::Error` will no longer use the
+ `ErrorKind::Other` variant.][85746] This is to better reflect that these
+ kinds of errors could be categorised [into newer more specific `ErrorKind`
+ variants][79965], and that they do not represent a user error.
+- [Using environment variable names with `process::Command` on Windows now
+ behaves as expected.][85270] Previously using environment variables with
+ `Command` would cause them to be ASCII-uppercased.
+- [Rustdoc will now warn on using rustdoc lints that aren't prefixed
+ with `rustdoc::`][86849]
+- `RUSTFLAGS` is no longer set for build scripts. Build scripts
+ should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
+ [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
+ for more details.
+
+[86849]: https://github.com/rust-lang/rust/pull/86849
+[86513]: https://github.com/rust-lang/rust/pull/86513
+[86334]: https://github.com/rust-lang/rust/pull/86334
+[86260]: https://github.com/rust-lang/rust/pull/86260
+[85970]: https://github.com/rust-lang/rust/pull/85970
+[85876]: https://github.com/rust-lang/rust/pull/85876
+[83572]: https://github.com/rust-lang/rust/pull/83572
+[86294]: https://github.com/rust-lang/rust/pull/86294
+[86858]: https://github.com/rust-lang/rust/pull/86858
+[86761]: https://github.com/rust-lang/rust/pull/86761
+[85746]: https://github.com/rust-lang/rust/pull/85746
+[85270]: https://github.com/rust-lang/rust/pull/85270
+[83918]: https://github.com/rust-lang/rust/pull/83918
+[79965]: https://github.com/rust-lang/rust/pull/79965
+[cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
+[cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
+[cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
+[cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
+[`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
+[`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
+[`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
+[`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
+[`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
+[`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
+[`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
+[`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
+[`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
+[`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
+[`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
+[`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
+[`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
+[`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
+[`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
+[`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
+[`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
+[`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
+
+
+Version 1.54.0 (2021-07-29)
+============================
+
+Language
+-----------------------
+
+- [You can now use macros for values in some built-in attributes.][83366]
+ This primarily allows you to call macros within the `#[doc]` attribute. For
+ example, to include external documentation in your crate, you can now write
+ the following:
+ ```rust
+ #![doc = include_str!("README.md")]
+ ```
+
+- [You can now cast between unsized slice types (and types which contain
+ unsized slices) in `const fn`.][85078]
+- [You can now use multiple generic lifetimes with `impl Trait` where the
+ lifetimes don't explicitly outlive another.][84701] In code this means
+ that you can now have `impl Trait<'a, 'b>` where as before you could
+ only have `impl Trait<'a, 'b> where 'b: 'a`.
+
+Compiler
+-----------------------
+
+- [Rustc will now search for custom JSON targets in
+ `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
+ directory.][83800] You can find your sysroot directory by running
+ `rustc --print sysroot`.
+- [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
+- [You can now use `#[target_feature]` on safe functions when targeting
+ WebAssembly platforms.][84988]
+- [Improved debugger output for enums on Windows MSVC platforms.][85292]
+- [Added tier 3\* support for `bpfel-unknown-none`
+ and `bpfeb-unknown-none`.][79608]
+- [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
+
+\* Refer to Rust's [platform support page][platform-support-doc] for more
+ information on Rust's tiered platform support.
+
+Libraries
+-----------------------
+
+- [`panic::panic_any` will now `#[track_caller]`.][85745]
+- [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
+- [ `proc_macro::Literal` now implements `FromStr`.][84717]
+- [The implementations of vendor intrinsics in core::arch have been
+ significantly refactored.][83278] The main user-visible changes are
+ a 50% reduction in the size of libcore.rlib and stricter validation
+ of constant operands passed to intrinsics. The latter is technically
+ a breaking change, but allows Rust to more closely match the C vendor
+ intrinsics API.
+
+Stabilized APIs
+---------------
+
+- [`BTreeMap::into_keys`]
+- [`BTreeMap::into_values`]
+- [`HashMap::into_keys`]
+- [`HashMap::into_values`]
+- [`arch::wasm32`]
+- [`VecDeque::binary_search`]
+- [`VecDeque::binary_search_by`]
+- [`VecDeque::binary_search_by_key`]
+- [`VecDeque::partition_point`]
+
+Cargo
+-----
+
+- [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
+ the dependency graph.][cargo/9520]
+- [Added the `--depth` option to `cargo-tree` to print only to a certain depth
+ in the tree ][cargo/9499]
+- [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
+ macro dependencies.][cargo/9488]
+- [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
+ This variable points to a directory that integration tests and benches
+ can use as a "scratchpad" for testing filesystem operations.
+
+Compatibility Notes
+-------------------
+- [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
+- [Previously unsound code is no longer permitted where different constructors in branches
+ could require different lifetimes.][85574]
+- As previously mentioned the [`std::arch` intrinsics now uses stricter const checking][83278]
+ than before and may reject some previously accepted code.
+- [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
+ when compiled with `codegen-units = 1`.][86063]
+
+[85574]: https://github.com/rust-lang/rust/issues/85574
+[86831]: https://github.com/rust-lang/rust/issues/86831
+[86063]: https://github.com/rust-lang/rust/issues/86063
+[79608]: https://github.com/rust-lang/rust/pull/79608
+[84988]: https://github.com/rust-lang/rust/pull/84988
+[84701]: https://github.com/rust-lang/rust/pull/84701
+[84072]: https://github.com/rust-lang/rust/pull/84072
+[85745]: https://github.com/rust-lang/rust/pull/85745
+[84744]: https://github.com/rust-lang/rust/pull/84744
+[85078]: https://github.com/rust-lang/rust/pull/85078
+[84717]: https://github.com/rust-lang/rust/pull/84717
+[83800]: https://github.com/rust-lang/rust/pull/83800
+[83366]: https://github.com/rust-lang/rust/pull/83366
+[83278]: https://github.com/rust-lang/rust/pull/83278
+[85292]: https://github.com/rust-lang/rust/pull/85292
+[82834]: https://github.com/rust-lang/rust/pull/82834
+[cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
+[cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
+[cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
+[cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
+[`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
+[`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
+[`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
+[`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
+[`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
+[`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
+[`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
+
+[`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
+
+[`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
+
+Version 1.53.0 (2021-06-17)
+============================
+
+Language
+-----------------------
+- [You can now use unicode for identifiers.][83799] This allows multilingual
+ identifiers but still doesn't allow glyphs that are not considered characters
+ such as `◆` or `🦀`. More specifically you can now use any identifier that
+ matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
+ is the same standard as languages like Python, however Rust uses NFC
+ normalization which may be different from other languages.
+- [You can now specify "or patterns" inside pattern matches.][79278]
+ Previously you could only use `|` (OR) on complete patterns. E.g.
+ ```rust
+ let x = Some(2u8);
+ // Before
+ matches!(x, Some(1) | Some(2));
+ // Now
+ matches!(x, Some(1 | 2));
+ ```
+- [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
+ has the same semantics as the `:pat` matcher. This is to allow `:pat`
+ to change semantics to being a pattern fragment in a future edition.
+
+Compiler
+-----------------------
+- [Updated the minimum external LLVM version to LLVM 10.][83387]
+- [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
+- [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
+
+\* Refer to Rust's [platform support page][platform-support-doc] for more
+information on Rust's tiered platform support.
+
+Libraries
+-----------------------
+- [Abort messages will now forward to `android_set_abort_message` on
+ Android platforms when available.][81469]
+- [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
+- [Arrays of any length now implement `IntoIterator`.][84147]
+ Currently calling `.into_iter()` as a method on an array will
+ return `impl Iterator<Item=&T>`, but this may change in a
+ future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
+ directly on arrays will provide `impl Iterator<Item=T>` as expected.
+- [`leading_zeros`, and `trailing_zeros` are now available on all
+ `NonZero` integer types.][84082]
+- [`{f32, f64}::from_str` now parse and print special values
+ (`NaN`, `-0`) according to IEEE 754.][78618]
+- [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
+- [Add the `BITS` associated constant to all numeric types.][82565]
+
+Stabilised APIs
+---------------
+- [`AtomicBool::fetch_update`]
+- [`AtomicPtr::fetch_update`]
+- [`BTreeMap::retain`]
+- [`BTreeSet::retain`]
+- [`BufReader::seek_relative`]
+- [`DebugStruct::non_exhaustive`]
+- [`Duration::MAX`]
+- [`Duration::ZERO`]
+- [`Duration::is_zero`]
+- [`Duration::saturating_add`]
+- [`Duration::saturating_mul`]
+- [`Duration::saturating_sub`]
+- [`ErrorKind::Unsupported`]
+- [`Option::insert`]
+- [`Ordering::is_eq`]
+- [`Ordering::is_ge`]
+- [`Ordering::is_gt`]
+- [`Ordering::is_le`]
+- [`Ordering::is_lt`]
+- [`Ordering::is_ne`]
+- [`OsStr::is_ascii`]
+- [`OsStr::make_ascii_lowercase`]
+- [`OsStr::make_ascii_uppercase`]
+- [`OsStr::to_ascii_lowercase`]
+- [`OsStr::to_ascii_uppercase`]
+- [`Peekable::peek_mut`]
+- [`Rc::decrement_strong_count`]
+- [`Rc::increment_strong_count`]
+- [`Vec::extend_from_within`]
+- [`array::from_mut`]
+- [`array::from_ref`]
+- [`cmp::max_by_key`]
+- [`cmp::max_by`]
+- [`cmp::min_by_key`]
+- [`cmp::min_by`]
+- [`f32::is_subnormal`]
+- [`f64::is_subnormal`]
+
+Cargo
+-----------------------
+- [Cargo now supports git repositories where the default `HEAD` branch is not
+ "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
+ which can handle default branches correctly.
+- [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
+- [The `authors` field is no longer included in `Cargo.toml` for new
+ projects.][cargo/9282]
+
+Rustdoc
+-----------------------
+- [Added the `rustdoc::bare_urls` lint that warns when you have URLs
+ without hyperlinks.][81764]
+
+Compatibility Notes
+-------------------
+- [Implement token-based handling of attributes during expansion][82608]
+- [`Ipv4::from_str` will now reject octal format IP addresses in addition
+ to rejecting hexadecimal IP addresses.][83652] The octal format can lead
+ to confusion and potential security vulnerabilities and [is no
+ longer recommended][ietf6943].
+- [The added `BITS` constant may conflict with external definitions.][85667]
+ In particular, this was known to be a problem in the `lexical-core` crate,
+ but they have published fixes for semantic versions 0.4 through 0.7. To
+ update this dependency alone, use `cargo update -p lexical-core`.
+- Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
+
+Internal Only
+-------------
+These changes provide no direct user facing benefits, but represent significant
+improvements to the internals and overall performance of rustc and
+related tools.
+
+- [Rework the `std::sys::windows::alloc` implementation.][83065]
+- [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
+- [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
+- [Rework rustdoc const type][82873]
+
+[85667]: https://github.com/rust-lang/rust/pull/85667
+[83386]: https://github.com/rust-lang/rust/pull/83386
+[82771]: https://github.com/rust-lang/rust/pull/82771
+[84147]: https://github.com/rust-lang/rust/pull/84147
+[84082]: https://github.com/rust-lang/rust/pull/84082
+[83799]: https://github.com/rust-lang/rust/pull/83799
+[83681]: https://github.com/rust-lang/rust/pull/83681
+[83652]: https://github.com/rust-lang/rust/pull/83652
+[83387]: https://github.com/rust-lang/rust/pull/83387
+[82873]: https://github.com/rust-lang/rust/pull/82873
+[82864]: https://github.com/rust-lang/rust/pull/82864
+[82608]: https://github.com/rust-lang/rust/pull/82608
+[82565]: https://github.com/rust-lang/rust/pull/82565
+[80525]: https://github.com/rust-lang/rust/pull/80525
+[79278]: https://github.com/rust-lang/rust/pull/79278
+[78618]: https://github.com/rust-lang/rust/pull/78618
+[77704]: https://github.com/rust-lang/rust/pull/77704
+[83941]: https://github.com/rust-lang/rust/pull/83941
+[83065]: https://github.com/rust-lang/rust/pull/83065
+[81764]: https://github.com/rust-lang/rust/pull/81764
+[81469]: https://github.com/rust-lang/rust/pull/81469
+[cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
+[cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
+[cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
+[`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
+[`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
+[`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
+[`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
+[`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
+[`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
+[`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
+[`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
+[`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
+[`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
+[`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
+[`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
+[`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
+[`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
+[`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
+[`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
+[`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
+[`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
+[`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
+[`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
+[`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
+[`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
+[`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
+[`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
+[`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
+[`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
+[`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.decrement_strong_count
+[`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
+[`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
+[`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
+[`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
+[`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
+[`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
+[`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
+[`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
+[`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f32.html#method.is_subnormal
+[`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
+[ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
+
+
+Version 1.52.1 (2021-05-10)
+============================
+
+This release disables incremental compilation, unless the user has explicitly
+opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
+
+This is due to the widespread, and frequently occurring, breakage encountered by
+Rust users due to newly enabled incremental verification in 1.52.0. Notably,
+Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
+newly added incremental verification are still present in past stable versions,
+and are not yet fixed on any channel. These bugs can lead to miscompilation of
+Rust binaries.
+
+These problems only affect incremental builds, so release builds with Cargo
+should not be affected unless the user has explicitly opted into incremental.
+Debug and check builds are affected.
+
+See [84970] for more details.
+
+[84970]: https://github.com/rust-lang/rust/issues/84970
+
+Version 1.52.0 (2021-05-06)
+============================
+
+Language
+--------
+- [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
+ in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
+ is allowed by default, and may become a warning or hard error in a
+ future edition.
+- [You can now cast mutable references to arrays to a pointer of the same type as
+ the element.][81479]
+
+Compiler
+--------
+- [Upgraded the default LLVM to LLVM 12.][81451]
+
+Added tier 3\* support for the following targets.
+
+- [`s390x-unknown-linux-musl`][82166]
+- [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
+- [`powerpc-unknown-openbsd`][82733]
+
+\* Refer to Rust's [platform support page][platform-support-doc] for more
+information on Rust's tiered platform support.
+
+Libraries
+---------
+- [`OsString` now implements `Extend` and `FromIterator`.][82121]
+- [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
+- [`Arc<impl Error>` now implements `error::Error`.][80553]
+- [All integer division and remainder operations are now `const`.][80962]
+
+Stabilised APIs
+-------------
+- [`Arguments::as_str`]
+- [`char::MAX`]
+- [`char::REPLACEMENT_CHARACTER`]
+- [`char::UNICODE_VERSION`]
+- [`char::decode_utf16`]
+- [`char::from_digit`]
+- [`char::from_u32_unchecked`]
+- [`char::from_u32`]
+- [`slice::partition_point`]
+- [`str::rsplit_once`]
+- [`str::split_once`]
+
+The following previously stable APIs are now `const`.
+
+- [`char::len_utf8`]
+- [`char::len_utf16`]
+- [`char::to_ascii_uppercase`]
+- [`char::to_ascii_lowercase`]
+- [`char::eq_ignore_ascii_case`]
+- [`u8::to_ascii_uppercase`]
+- [`u8::to_ascii_lowercase`]
+- [`u8::eq_ignore_ascii_case`]
+
+Rustdoc
+-------
+- [Rustdoc lints are now treated as a tool lint, meaning that
+ lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
+ Using the old style is still allowed, and will become a warning in
+ a future release.
+- [Rustdoc now supports argument files.][82261]
+- [Rustdoc now generates smart punctuation for documentation.][79423]
+- [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
+ ```markdown
+ - [x] Complete
+ - [ ] Todo
+ ```
+
+Misc
+----
+- [You can now pass multiple filters to tests.][81356] E.g.
+ `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
+- [Rustup now distributes PDB symbols for the `std` library on Windows,
+ allowing you to see `std` symbols when debugging.][82218]
+
+Internal Only
+-------------
+These changes provide no direct user facing benefits, but represent significant
+improvements to the internals and overall performance of rustc and
+related tools.
+
+- [Check the result cache before the DepGraph when ensuring queries][81855]
+- [Try fast_reject::simplify_type in coherence before doing full check][81744]
+- [Only store a LocalDefId in some HIR nodes][81611]
+- [Store HIR attributes in a side table][79519]
+
+Compatibility Notes
+-------------------
+- [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
+- [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
+- [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
+- [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
+ languages in code blocks.][78429]
+- [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
+- [Changes in how proc macros handle whitespace may lead to panics when used
+ with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
+- [Turn `#[derive]` into a regular macro attribute][79078]
+
+[84136]: https://github.com/rust-lang/rust/issues/84136
+[80763]: https://github.com/rust-lang/rust/pull/80763
+[82166]: https://github.com/rust-lang/rust/pull/82166
+[82121]: https://github.com/rust-lang/rust/pull/82121
+[81879]: https://github.com/rust-lang/rust/pull/81879
+[82261]: https://github.com/rust-lang/rust/pull/82261
+[82218]: https://github.com/rust-lang/rust/pull/82218
+[82216]: https://github.com/rust-lang/rust/pull/82216
+[82202]: https://github.com/rust-lang/rust/pull/82202
+[81855]: https://github.com/rust-lang/rust/pull/81855
+[81766]: https://github.com/rust-lang/rust/pull/81766
+[81744]: https://github.com/rust-lang/rust/pull/81744
+[81611]: https://github.com/rust-lang/rust/pull/81611
+[81479]: https://github.com/rust-lang/rust/pull/81479
+[81451]: https://github.com/rust-lang/rust/pull/81451
+[81356]: https://github.com/rust-lang/rust/pull/81356
+[80962]: https://github.com/rust-lang/rust/pull/80962
+[80553]: https://github.com/rust-lang/rust/pull/80553
+[80527]: https://github.com/rust-lang/rust/pull/80527
+[79519]: https://github.com/rust-lang/rust/pull/79519
+[79423]: https://github.com/rust-lang/rust/pull/79423
+[79208]: https://github.com/rust-lang/rust/pull/79208
+[78429]: https://github.com/rust-lang/rust/pull/78429
+[82733]: https://github.com/rust-lang/rust/pull/82733
+[82594]: https://github.com/rust-lang/rust/pull/82594
+[79078]: https://github.com/rust-lang/rust/pull/79078
+[cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
+[`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
+[`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
+[`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
+[`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
+[`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
+[`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
+[`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
+[`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
+[`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
+[`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
+[`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
+[`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
+[`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
+[`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
+[`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
+[`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
+[`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
+[`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
+[`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
+[`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
+[`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
+
+Version 1.51.0 (2021-03-25)
+============================
+
+Language
+--------
+- [You can now parameterize items such as functions, traits, and `struct`s by constant
+ values in addition to by types and lifetimes.][79135] Also known as "const generics"
+ E.g. you can now write the following. Note: Only values of primitive integers,
+ `bool`, or `char` types are currently permitted.
+ ```rust
+ struct GenericArray<T, const LENGTH: usize> {
+ inner: [T; LENGTH]
+ }
+
+ impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
+ const fn last(&self) -> Option<&T> {
+ if LENGTH == 0 {
+ None
+ } else {
+ Some(&self.inner[LENGTH - 1])
+ }
+ }
+ }
+ ```
+
+
+Compiler
+--------
+
+- [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
+ This option controls whether debug information is split across multiple files
+ or packed into a single file. **Note** This option is unstable on other platforms.
+- [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
+ `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
+- [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
+- [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
+
+\* Refer to Rust's [platform support page][platform-support-doc] for more
+information on Rust's tiered platform support.
+
+Libraries
+---------
+
+- [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
+- [`str` now implements `AsMut<str>`.][80279]
+- [`u64` and `u128` now implement `From<char>`.][79502]
+- [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
+- [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
+- [`unsigned_abs` is now implemented for all signed integer types.][80959]
+- [`io::Empty` now implements `io::Seek`.][78044]
+- [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
+ `T: ?Sized` types.][80764]
+- [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
+
+
+Stabilized APIs
+---------------
+
+- [`Arc::decrement_strong_count`]
+- [`Arc::increment_strong_count`]
+- [`Once::call_once_force`]
+- [`Peekable::next_if_eq`]
+- [`Peekable::next_if`]
+- [`Seek::stream_position`]
+- [`array::IntoIter`]
+- [`panic::panic_any`]
+- [`ptr::addr_of!`]
+- [`ptr::addr_of_mut!`]
+- [`slice::fill_with`]
+- [`slice::split_inclusive_mut`]
+- [`slice::split_inclusive`]
+- [`slice::strip_prefix`]
+- [`slice::strip_suffix`]
+- [`str::split_inclusive`]
+- [`sync::OnceState`]
+- [`task::Wake`]
+- [`VecDeque::range`]
+- [`VecDeque::range_mut`]
+
+Cargo
+-----
+- [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
+ codegen option.][cargo/9112]
+- [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
+ and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
+ to avoid unifying features of dependencies where that unification could be unwanted.
+ Such as using the same dependency with a `std` feature in a build scripts and
+ proc-macros, while using the `no-std` feature in the final binary. See the
+ [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
+
+Rustdoc
+-------
+
+- [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
+- [You can now provide a `--default-theme` flag which sets the default theme to use for
+ documentation.][79642]
+
+Various improvements to intra-doc links:
+
+- [You can link to non-path primitives such as `slice`.][80181]
+- [You can link to associated items.][74489]
+- [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
+
+Misc
+----
+- [You can now pass `--include-ignored` to tests (e.g. with
+ `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
+
+Compatibility Notes
+-------------------
+
+- [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
+- [`rustc` no longer promotes division, modulo and indexing operations to `const` that
+ could fail.][80579]
+- [The minimum version of glibc for the following platforms has been bumped to version 2.31
+ for the distributed artifacts.][81521]
+ - `armv5te-unknown-linux-gnueabi`
+ - `sparc64-unknown-linux-gnu`
+ - `thumbv7neon-unknown-linux-gnueabihf`
+ - `armv7-unknown-linux-gnueabi`
+ - `x86_64-unknown-linux-gnux32`
+- [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
+
+Internal Only
+-------------
+
+- [Consistently avoid constructing optimized MIR when not doing codegen][80718]
+
+[79135]: https://github.com/rust-lang/rust/pull/79135
+[74489]: https://github.com/rust-lang/rust/pull/74489
+[76934]: https://github.com/rust-lang/rust/pull/76934
+[79570]: https://github.com/rust-lang/rust/pull/79570
+[80181]: https://github.com/rust-lang/rust/pull/80181
+[79642]: https://github.com/rust-lang/rust/pull/79642
+[80945]: https://github.com/rust-lang/rust/pull/80945
+[80279]: https://github.com/rust-lang/rust/pull/80279
+[80053]: https://github.com/rust-lang/rust/pull/80053
+[79502]: https://github.com/rust-lang/rust/pull/79502
+[75180]: https://github.com/rust-lang/rust/pull/75180
+[81521]: https://github.com/rust-lang/rust/pull/81521
+[80968]: https://github.com/rust-lang/rust/pull/80968
+[80959]: https://github.com/rust-lang/rust/pull/80959
+[80718]: https://github.com/rust-lang/rust/pull/80718
+[80653]: https://github.com/rust-lang/rust/pull/80653
+[80579]: https://github.com/rust-lang/rust/pull/80579
+[79998]: https://github.com/rust-lang/rust/pull/79998
+[78044]: https://github.com/rust-lang/rust/pull/78044
+[81455]: https://github.com/rust-lang/rust/pull/81455
+[80764]: https://github.com/rust-lang/rust/pull/80764
+[80749]: https://github.com/rust-lang/rust/pull/80749
+[80662]: https://github.com/rust-lang/rust/pull/80662
+[79134]: https://github.com/rust-lang/rust/pull/79134
+[80966]: https://github.com/rust-lang/rust/pull/80966
+[cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
+[cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
+[feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
+[`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
+[`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
+[`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
+[`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
+[`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_suffix
+[`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
+[`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
+[`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
+[`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
+[`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
+[`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
+[`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
+[`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
+[`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
+[`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
+[`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
+[`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
+[`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
+[`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
+[`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
+
+Version 1.50.0 (2021-02-11)
+============================
+
+Language
+-----------------------
+- [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
+ This has been technically possible since 1.38.0, as it was unintentionally stabilized.
+- [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
+
+Compiler
+-----------------------
+- [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
+- [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
+- [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
+- [Dropped support for all cloudabi targets.][78439]
+
+\* Refer to Rust's [platform support page][platform-support-doc] for more
+information on Rust's tiered platform support.
+
+Libraries
+-----------------------
+
+- [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
+- [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
+- [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
+ This value cannot be a valid file descriptor, and now means `Option<File>` takes
+ up the same amount of space as `File`.
+
+Stabilized APIs
+---------------
+
+- [`bool::then`]
+- [`btree_map::Entry::or_insert_with_key`]
+- [`f32::clamp`]
+- [`f64::clamp`]
+- [`hash_map::Entry::or_insert_with_key`]
+- [`Ord::clamp`]
+- [`RefCell::take`]
+- [`slice::fill`]
+- [`UnsafeCell::get_mut`]
+
+The following previously stable methods are now `const`.
+
+- [`IpAddr::is_ipv4`]
+- [`IpAddr::is_ipv6`]
+- [`IpAddr::is_unspecified`]
+- [`IpAddr::is_loopback`]
+- [`IpAddr::is_multicast`]
+- [`Ipv4Addr::octets`]
+- [`Ipv4Addr::is_loopback`]
+- [`Ipv4Addr::is_private`]
+- [`Ipv4Addr::is_link_local`]
+- [`Ipv4Addr::is_multicast`]
+- [`Ipv4Addr::is_broadcast`]
+- [`Ipv4Addr::is_documentation`]
+- [`Ipv4Addr::to_ipv6_compatible`]
+- [`Ipv4Addr::to_ipv6_mapped`]
+- [`Ipv6Addr::segments`]
+- [`Ipv6Addr::is_unspecified`]
+- [`Ipv6Addr::is_loopback`]
+- [`Ipv6Addr::is_multicast`]
+- [`Ipv6Addr::to_ipv4`]
+- [`Layout::size`]
+- [`Layout::align`]
+- [`Layout::from_size_align`]
+- `pow` for all integer types.
+- `checked_pow` for all integer types.
+- `saturating_pow` for all integer types.
+- `wrapping_pow` for all integer types.
+- `next_power_of_two` for all unsigned integer types.
+- `checked_next_power_of_two` for all unsigned integer types.
+
+Cargo
+-----------------------
+
+- [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
+ This option sets a wrapper to execute instead of `rustc`, for workspace members only.
+- [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
+ contents of that directory for changes.][cargo/8973]
+- [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
+
+Misc
+----
+
+- [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
+- [Running tests will now print the total time taken to execute.][75752]
+
+Compatibility Notes
+-------------------
+
+- [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
+ recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
+- [Changes in how `TokenStream`s are checked have fixed some cases where you could write
+ unhygenic `macro_rules!` macros.][79472]
+- [`#![test]` as an inner attribute is now considered unstable like other inner macro
+ attributes, and reports an error by default through the `soft_unstable` lint.][79003]
+- [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
+- [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
+ recommended to use the `#[panic_handler]` attribute to provide your own implementation.
+- [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
+
+[74989]: https://github.com/rust-lang/rust/pull/74989
+[79261]: https://github.com/rust-lang/rust/pull/79261
+[79896]: https://github.com/rust-lang/rust/pull/79896
+[79484]: https://github.com/rust-lang/rust/pull/79484
+[79472]: https://github.com/rust-lang/rust/pull/79472
+[79270]: https://github.com/rust-lang/rust/pull/79270
+[79003]: https://github.com/rust-lang/rust/pull/79003
+[78864]: https://github.com/rust-lang/rust/pull/78864
+[78636]: https://github.com/rust-lang/rust/pull/78636
+[78439]: https://github.com/rust-lang/rust/pull/78439
+[78343]: https://github.com/rust-lang/rust/pull/78343
+[78296]: https://github.com/rust-lang/rust/pull/78296
+[78068]: https://github.com/rust-lang/rust/pull/78068
+[75752]: https://github.com/rust-lang/rust/pull/75752
+[74699]: https://github.com/rust-lang/rust/pull/74699
+[78142]: https://github.com/rust-lang/rust/pull/78142
+[77484]: https://github.com/rust-lang/rust/pull/77484
+[cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
+[cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
+[cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
+[`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
+[`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
+[`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
+[`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
+[`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
+[`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
+[`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
+[`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
+[`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
+[`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
+[`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
+[`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
+[`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
+[`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
+[`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
+[`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
+[`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
+[`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
+[`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
+[`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
+[`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
+[`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
+[`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
+[`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
+[`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
+[`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
+[`btree_map::Entry::or_insert_with_key`]: https://doc.rust-lang.org/stable/std/collections/btree_map/enum.Entry.html#method.or_insert_with_key
+[`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
+[`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
+[`hash_map::Entry::or_insert_with_key`]: https://doc.rust-lang.org/stable/std/collections/hash_map/enum.Entry.html#method.or_insert_with_key
+[`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
+
+
+Version 1.49.0 (2020-12-31)
+============================
+
+Language
+-----------------------
+
+- [Unions can now implement `Drop`, and you can now have a field in a union
+ with `ManuallyDrop<T>`.][77547]
+- [You can now cast uninhabited enums to integers.][76199]
+- [You can now bind by reference and by move in patterns.][76119] This
+ allows you to selectively borrow individual components of a type. E.g.
+ ```rust
+ #[derive(Debug)]
+ struct Person {
+ name: String,
+ age: u8,
+ }
+
+ let person = Person {
+ name: String::from("Alice"),
+ age: 20,
+ };
+
+ // `name` is moved out of person, but `age` is referenced.
+ let Person { name, ref age } = person;
+ println!("{} {}", name, age);
+ ```
+
+Compiler
+-----------------------
+
+- [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
+- [Added tier 2 support for `aarch64-apple-darwin`.][75991]
+- [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
+- [Added tier 3 support for `mipsel-unknown-none`.][78676]
+- [Raised the minimum supported LLVM version to LLVM 9.][78848]
+- [Output from threads spawned in tests is now captured.][78227]
+- [Change os and vendor values to "none" and "unknown" for some targets][78951]
+
+\* Refer to Rust's [platform support page][platform-support-doc] for more
+information on Rust's tiered platform support.
+
+Libraries
+-----------------------
+
+- [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
+- [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
+
+Stabilized APIs
+---------------
+
+- [`slice::select_nth_unstable`]
+- [`slice::select_nth_unstable_by`]
+- [`slice::select_nth_unstable_by_key`]
+
+The following previously stable methods are now `const`.
+
+- [`Poll::is_ready`]
+- [`Poll::is_pending`]
+
+Cargo
+-----------------------
+- [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
+- [`cargo-tree` now marks proc-macro crates.][cargo/8765]
+- [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
+ variable will be set if the crate being built is one the user selected to build, either
+ with `-p` or through defaults.
+- [You can now use glob patterns when specifying packages & targets.][cargo/8752]
+
+
+Compatibility Notes
+-------------------
+
+- [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
+- [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
+- [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
+ Previously such invalid or unused attributes could be ignored.
+- Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
+ read [this post about the changes][rustdoc-ws-post] for more details.
+- [Trait bounds are no longer inferred for associated types.][79904]
+
+Internal Only
+-------------
+These changes provide no direct user facing benefits, but represent significant
+improvements to the internals and overall performance of rustc and
+related tools.
+
+- [rustc's internal crates are now compiled using the `initial-exec` Thread
+ Local Storage model.][78201]
+- [Calculate visibilities once in resolve.][78077]
+- [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
+- [Added `--color` for configuring terminal color support to bootstrap.][79004]
+
+
+[75991]: https://github.com/rust-lang/rust/pull/75991
+[78951]: https://github.com/rust-lang/rust/pull/78951
+[78848]: https://github.com/rust-lang/rust/pull/78848
+[78746]: https://github.com/rust-lang/rust/pull/78746
+[78376]: https://github.com/rust-lang/rust/pull/78376
+[78228]: https://github.com/rust-lang/rust/pull/78228
+[78227]: https://github.com/rust-lang/rust/pull/78227
+[78201]: https://github.com/rust-lang/rust/pull/78201
+[78109]: https://github.com/rust-lang/rust/pull/78109
+[78077]: https://github.com/rust-lang/rust/pull/78077
+[77997]: https://github.com/rust-lang/rust/pull/77997
+[77703]: https://github.com/rust-lang/rust/pull/77703
+[77547]: https://github.com/rust-lang/rust/pull/77547
+[77015]: https://github.com/rust-lang/rust/pull/77015
+[76199]: https://github.com/rust-lang/rust/pull/76199
+[76119]: https://github.com/rust-lang/rust/pull/76119
+[75914]: https://github.com/rust-lang/rust/pull/75914
+[79004]: https://github.com/rust-lang/rust/pull/79004
+[78676]: https://github.com/rust-lang/rust/pull/78676
+[79904]: https://github.com/rust-lang/rust/issues/79904
+[cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
+[cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
+[cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
+[cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
+[`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
+[`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
+[`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
+[`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
+[`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
+[rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
+
+Version 1.48.0 (2020-11-19)
+==========================
+
+Language
+--------
+
+- [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
+ is still rejected *semantically*, but can now be parsed by procedural macros.
+
+Compiler
+--------
+- [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
+ `rustc` whether to link its own C runtime and libraries or to rely on a external
+ linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
+- [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
+ Note: If you're using cargo you must explicitly pass the `--target` flag.
+- [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
+
+\* Refer to Rust's [platform support page][platform-support-doc] for more
+information on Rust's tiered platform support.
+
+Libraries
+---------
+- [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
+ and `&Stderr`.][76275]
+- [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
+- [The `matches!` macro now supports having a trailing comma.][74880]
+- [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
+- [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
+
+Stabilized APIs
+---------------
+- [`slice::as_ptr_range`]
+- [`slice::as_mut_ptr_range`]
+- [`VecDeque::make_contiguous`]
+- [`future::pending`]
+- [`future::ready`]
+
+The following previously stable methods are now `const fn`'s:
+
+- [`Option::is_some`]
+- [`Option::is_none`]
+- [`Option::as_ref`]
+- [`Result::is_ok`]
+- [`Result::is_err`]
+- [`Result::as_ref`]
+- [`Ordering::reverse`]
+- [`Ordering::then`]
+
+Cargo
+-----
+
+Rustdoc
+-------
+- [You can now link to items in `rustdoc` using the intra-doc link
+ syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
+ a link to `std::future`'s documentation. See ["Linking to items by
+ name"][intradoc-links] for more information.
+- [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
+ when searching through `rustdoc`'s UI.][75740]
+
+Compatibility Notes
+-------------------
+- [Promotion of references to `'static` lifetime inside `const fn` now follows the
+ same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
+ promoted to `'static` lifetime any more inside `const fn`s.
+- [Associated type bindings on trait objects are now verified to meet the bounds
+ declared on the trait when checking that they implement the trait.][27675]
+- [When trait bounds on associated types or opaque types are ambiguous, the
+ compiler no longer makes an arbitrary choice on which bound to use.][54121]
+- [Fixed recursive nonterminals not being expanded in macros during
+ pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
+ correctly handling recursive nonterminal tokens.
+- [`&mut` references to non zero-sized types are no longer promoted.][75585]
+- [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
+ in places where they have no effect.][73461]
+- [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
+ `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
+- [`mem::uninitialized` will now panic if any inner types inside a struct or enum
+ disallow zero-initialization.][71274]
+- [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
+- [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
+ Note: This behaviour is not guaranteed and is still considered undefined behaviour,
+ see the [`catch_unwind`] documentation for further information.
+
+
+
+Internal Only
+-------------
+These changes provide no direct user facing benefits, but represent significant
+improvements to the internals and overall performance of rustc and
+related tools.
+
+- [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
+ You can continue building with `make` by setting `ninja=false` in
+ your `config.toml`.
+- [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
+- [Made `ensure_sufficient_stack()` non-generic][76680]
+
+[78143]: https://github.com/rust-lang/rust/issues/78143
+[76680]: https://github.com/rust-lang/rust/pull/76680/
+[76030]: https://github.com/rust-lang/rust/pull/76030/
+[70212]: https://github.com/rust-lang/rust/pull/70212/
+[27675]: https://github.com/rust-lang/rust/issues/27675/
+[54121]: https://github.com/rust-lang/rust/issues/54121/
+[71274]: https://github.com/rust-lang/rust/pull/71274/
+[77386]: https://github.com/rust-lang/rust/pull/77386/
+[77153]: https://github.com/rust-lang/rust/pull/77153/
+[77055]: https://github.com/rust-lang/rust/pull/77055/
+[76275]: https://github.com/rust-lang/rust/pull/76275/
+[76310]: https://github.com/rust-lang/rust/pull/76310/
+[76420]: https://github.com/rust-lang/rust/pull/76420/
+[76158]: https://github.com/rust-lang/rust/pull/76158/
+[75857]: https://github.com/rust-lang/rust/pull/75857/
+[75585]: https://github.com/rust-lang/rust/pull/75585/
+[75740]: https://github.com/rust-lang/rust/pull/75740/
+[75502]: https://github.com/rust-lang/rust/pull/75502/
+[74880]: https://github.com/rust-lang/rust/pull/74880/
+[74922]: https://github.com/rust-lang/rust/pull/74922/
+[74430]: https://github.com/rust-lang/rust/pull/74430/
+[74194]: https://github.com/rust-lang/rust/pull/74194/
+[73461]: https://github.com/rust-lang/rust/pull/73461/
+[73166]: https://github.com/rust-lang/rust/pull/73166/
+[intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
+[`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
+[`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
+[`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
+[`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
+[`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
+[`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
+[`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
+[`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
+[`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
+[`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
+[`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
+[`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
+[`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
+[`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
+
+
+Version 1.47.0 (2020-10-08)
+==========================
+
+Language
+--------
+- [Closures will now warn when not used.][74869]
+
+Compiler
+--------
+- [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
+ [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
+ platforms.
+- [Upgraded to LLVM 11.][73526]
+- [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
+- [Upgrade the FreeBSD toolchain to version 11.4][75204]
+- [`RUST_BACKTRACE`'s output is now more compact.][75048]
+
+\* Refer to Rust's [platform support page][platform-support-doc] for more
+information on Rust's tiered platform support.
+
+Libraries
+---------
+- [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
+- [Traits in `std`/`core` are now implemented for arrays of any length, not just
+ those of length less than 33.][74060]
+- [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
+- [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
+ `PartialEq`, and `PartialOrd`.][73583]
+
+Stabilized APIs
+---------------
+- [`Ident::new_raw`]
+- [`Range::is_empty`]
+- [`RangeInclusive::is_empty`]
+- [`Result::as_deref`]
+- [`Result::as_deref_mut`]
+- [`Vec::leak`]
+- [`pointer::offset_from`]
+- [`f32::TAU`]
+- [`f64::TAU`]
+
+The following previously stable APIs have now been made const.
+
+- [The `new` method for all `NonZero` integers.][73858]
+- [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
+ `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
+ methods for all integers.][73858]
+- [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
+ signed integers.][73858]
+- [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
+ `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
+ `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
+ `is_ascii_control` methods for `char` and `u8`.][73858]
+
+Cargo
+-----
+- [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
+ You can override this by setting the following in your `Cargo.toml`.
+ ```toml
+ [profile.release.build-override]
+ opt-level = 3
+ ```
+- [`cargo-help` will now display man pages for commands rather just the
+ `--help` text.][cargo/8456]
+- [`cargo-metadata` now emits a `test` field indicating if a target has
+ tests enabled.][cargo/8478]
+- [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
+- [`cargo-publish` will now use an alternative registry by default if it's the
+ only registry specified in `package.publish`.][cargo/8571]
+
+Misc
+----
+- [Added a help button beside Rustdoc's searchbar that explains rustdoc's
+ type based search.][75366]
+- [Added the Ayu theme to rustdoc.][71237]
+
+Compatibility Notes
+-------------------
+- [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
+- [Fixed a regression parsing `{} && false` in tail expressions.][74650]
+- [Added changes to how proc-macros are expanded in `macro_rules!` that should
+ help to preserve more span information.][73084] These changes may cause
+ compilation errors if your macro was unhygenic or didn't correctly handle
+ `Delimiter::None`.
+- [Moved support for the CloudABI target to tier 3.][75568]
+- [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
+- [Added the `rustc-docs` component.][75560] This allows you to install
+ and read the documentation for the compiler internal APIs. (Currently only
+ available for `x86_64-unknown-linux-gnu`.)
+
+Internal Only
+--------
+
+- [Improved default settings for bootstrapping in `x.py`.][73964] You can read details about this change in the ["Changes to `x.py` defaults"](https://blog.rust-lang.org/inside-rust/2020/08/30/changes-to-x-py-defaults.html) post on the Inside Rust blog.
+
+[1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
+[75048]: https://github.com/rust-lang/rust/pull/75048/
+[74163]: https://github.com/rust-lang/rust/pull/74163/
+[71237]: https://github.com/rust-lang/rust/pull/71237/
+[74869]: https://github.com/rust-lang/rust/pull/74869/
+[73858]: https://github.com/rust-lang/rust/pull/73858/
+[75716]: https://github.com/rust-lang/rust/pull/75716/
+[75560]: https://github.com/rust-lang/rust/pull/75560/
+[75568]: https://github.com/rust-lang/rust/pull/75568/
+[75366]: https://github.com/rust-lang/rust/pull/75366/
+[75204]: https://github.com/rust-lang/rust/pull/75204/
+[74650]: https://github.com/rust-lang/rust/pull/74650/
+[74419]: https://github.com/rust-lang/rust/pull/74419/
+[73964]: https://github.com/rust-lang/rust/pull/73964/
+[74021]: https://github.com/rust-lang/rust/pull/74021/
+[74060]: https://github.com/rust-lang/rust/pull/74060/
+[73893]: https://github.com/rust-lang/rust/pull/73893/
+[73526]: https://github.com/rust-lang/rust/pull/73526/
+[73583]: https://github.com/rust-lang/rust/pull/73583/
+[73084]: https://github.com/rust-lang/rust/pull/73084/
+[73197]: https://github.com/rust-lang/rust/pull/73197/
+[cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
+[cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
+[cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
+[cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
+[cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
+[`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
+[`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
+[`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
+[`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
+[`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
+[`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
+[`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
+[`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
+[`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
+
+
+Version 1.46.0 (2020-08-27)
+==========================
+
+Language
+--------
+- [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
+- [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
+ const functions.][73862]
+- [The `#[track_caller]` attribute can now be added to functions to use the
+ function's caller's location information for panic messages.][72445]
+- [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
+ `x.0.0` over `(x.0).0`.
+- [`mem::transmute` can now be used in statics and constants.][72920] **Note**
+ You currently can't use `mem::transmute` in constant functions.
+
+Compiler
+--------
+- [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
+- [Enabled static "Position Independent Executables" by default
+ for `x86_64-unknown-linux-musl`.][70740]
+
+Libraries
+---------
+- [`mem::forget` is now a `const fn`.][73887]
+- [`String` now implements `From<char>`.][73466]
+- [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
+ integer types.][73032]
+- [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
+- [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
+ zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
+- [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
+- [`(String, u16)` now implements `ToSocketAddrs`.][73007]
+- [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
+
+Stabilized APIs
+---------------
+- [`Option::zip`]
+- [`vec::Drain::as_slice`]
+
+Cargo
+-----
+Added a number of new environment variables that are now available when
+compiling your crate.
+
+- [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
+ the specific binary being compiled and the name of the crate.
+- [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
+- [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
+
+Compatibility Notes
+-------------------
+- [The target configuration option `abi_blacklist` has been renamed
+ to `unsupported_abis`.][74150] The old name will still continue to work.
+- [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
+ This was previously accepted but will become a hard error in a future release.
+- [Rustc will fail to compile if you have a struct with
+ `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
+ allowed on `enum`s.
+- [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
+ ensure that spans have the correct information, and may cause breakage if you
+ were relying on receiving spans with dummy information.
+- [The InnoSetup installer for Windows is no longer available.][72569] This was
+ a legacy installer that was replaced by a MSI installer a few years ago but
+ was still being built.
+- [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
+- [Rustc will no longer accept overlapping trait implementations that only
+ differ in how the lifetime was bound.][72493]
+- [Rustc now correctly relates the lifetime of an existential associated
+ type.][71896] This fixes some edge cases where `rustc` would erroneously allow
+ you to pass a shorter lifetime than expected.
+- [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
+ The library will need to be installed for `rustc` to work, even though we
+ expect it to be already available on most systems.
+- [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
+ under QEMU.][74820]
+- [Pretty printing of some tokens in procedural macros changed.][75453] The
+ exact output returned by rustc's pretty printing is an unstable
+ implementation detail: we recommend any macro relying on it to switch to a
+ more robust parsing system.
+
+[75453]: https://github.com/rust-lang/rust/issues/75453/
+[74820]: https://github.com/rust-lang/rust/issues/74820/
+[74420]: https://github.com/rust-lang/rust/issues/74420/
+[74109]: https://github.com/rust-lang/rust/pull/74109/
+[74150]: https://github.com/rust-lang/rust/pull/74150/
+[73862]: https://github.com/rust-lang/rust/pull/73862/
+[73887]: https://github.com/rust-lang/rust/pull/73887/
+[73466]: https://github.com/rust-lang/rust/pull/73466/
+[73516]: https://github.com/rust-lang/rust/pull/73516/
+[73293]: https://github.com/rust-lang/rust/pull/73293/
+[73007]: https://github.com/rust-lang/rust/pull/73007/
+[73032]: https://github.com/rust-lang/rust/pull/73032/
+[72920]: https://github.com/rust-lang/rust/pull/72920/
+[72569]: https://github.com/rust-lang/rust/pull/72569/
+[72583]: https://github.com/rust-lang/rust/pull/72583/
+[72584]: https://github.com/rust-lang/rust/pull/72584/
+[72717]: https://github.com/rust-lang/rust/pull/72717/
+[72437]: https://github.com/rust-lang/rust/pull/72437/
+[72445]: https://github.com/rust-lang/rust/pull/72445/
+[72486]: https://github.com/rust-lang/rust/pull/72486/
+[72493]: https://github.com/rust-lang/rust/pull/72493/
+[72331]: https://github.com/rust-lang/rust/pull/72331/
+[71896]: https://github.com/rust-lang/rust/pull/71896/
+[71660]: https://github.com/rust-lang/rust/pull/71660/
+[71322]: https://github.com/rust-lang/rust/pull/71322/
+[70740]: https://github.com/rust-lang/rust/pull/70740/
+[cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
+[cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
+[cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
+[`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
+[`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
+
+
+Version 1.45.2 (2020-08-03)
+==========================
+
+* [Fix bindings in tuple struct patterns][74954]
+* [Fix track_caller integration with trait objects][74784]
+
+[74954]: https://github.com/rust-lang/rust/issues/74954
+[74784]: https://github.com/rust-lang/rust/issues/74784
+
+
+Version 1.45.1 (2020-07-30)
+==========================
+
+* [Fix const propagation with references.][73613]
+* [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
+* [Avoid spurious implicit region bound.][74509]
+* [Install clippy on x.py install][74457]
+
+[73613]: https://github.com/rust-lang/rust/pull/73613
+[73078]: https://github.com/rust-lang/rust/issues/73078
+[74509]: https://github.com/rust-lang/rust/pull/74509
+[74457]: https://github.com/rust-lang/rust/pull/74457
+
+
+Version 1.45.0 (2020-07-16)
+==========================
+
+Language
+--------
+- [Out of range float to int conversions using `as` has been defined as a saturating
+ conversion.][71269] This was previously undefined behaviour, but you can use the
+ `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
+ may be desirable in rare performance sensitive situations.
+- [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
+ using `u64`.][70705]
+- [Function like procedural macros can now be used in expression, pattern, and statement
+ positions.][68717] This means you can now use a function-like procedural macro
+ anywhere you can use a declarative (`macro_rules!`) macro.
+
+Compiler
+--------
+- [You can now override individual target features through the `target-feature`
+ flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
+ equivalent to `-C target-feature=+avx2,+fma`.
+- [Added the `force-unwind-tables` flag.][69984] This option allows
+ rustc to always generate unwind tables regardless of panic strategy.
+- [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
+ to include LLVM bitcode into generated `rlib`s (this is on by default).
+- [Added the `tiny` value to the `code-model` codegen flag.][72397]
+- [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
+- [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
+- [Upgraded to LLVM 10.][67759]
+
+\* Refer to Rust's [platform support page][platform-support-doc] for more
+information on Rust's tiered platform support.
+
+
+Libraries
+---------
+- [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
+ and `Ord`.][72239]
+- [`proc_macro::TokenStream` now implements `Default`.][72234]
+- [You can now use `char` with
+ `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
+ a range of codepoints.][72413] E.g.
+ you can now write the following;
+ ```rust
+ for ch in 'a'..='z' {
+ print!("{}", ch);
+ }
+ println!();
+ // Prints "abcdefghijklmnopqrstuvwxyz"
+ ```
+- [`OsString` now implements `FromStr`.][71662]
+- [The `saturating_neg` method has been added to all signed integer primitive
+ types, and the `saturating_abs` method has been added for all integer
+ primitive types.][71886]
+- [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
+ implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
+ or `Path`.][71447]
+- [`Box<[T]>` now implements `From<[T; N]>`.][71095]
+- [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
+ integer types.][69813]
+- [The `fetch_min`, and `fetch_max` methods have been added to all atomic
+ integer types.][72324]
+- [The `fetch_update` method has been added to all atomic integer types.][71843]
+
+Stabilized APIs
+---------------
+- [`Arc::as_ptr`]
+- [`BTreeMap::remove_entry`]
+- [`Rc::as_ptr`]
+- [`rc::Weak::as_ptr`]
+- [`rc::Weak::from_raw`]
+- [`rc::Weak::into_raw`]
+- [`str::strip_prefix`]
+- [`str::strip_suffix`]
+- [`sync::Weak::as_ptr`]
+- [`sync::Weak::from_raw`]
+- [`sync::Weak::into_raw`]
+- [`char::UNICODE_VERSION`]
+- [`Span::resolved_at`]
+- [`Span::located_at`]
+- [`Span::mixed_site`]
+- [`unix::process::CommandExt::arg0`]
+
+Cargo
+-----
+
+- [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
+ time.][cargo/8066]
+
+Misc
+----
+- [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
+ `~~outdated information~~` becomes "~~outdated information~~".
+- [Added an emoji to Rustdoc's deprecated API message.][72014]
+
+Compatibility Notes
+-------------------
+- [Trying to self initialize a static value (that is creating a value using
+ itself) is unsound and now causes a compile error.][71140]
+- [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
+ This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
+- [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
+ previously undocumented and not intended for public use. Rustdoc still provides
+ a non-zero exit code on errors.
+- [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
+ This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
+ flags while cargo is adding `embed-bitcode` itself. The recommended way to
+ control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
+ or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
+
+Internals Only
+--------------
+- [Make clippy a git subtree instead of a git submodule][70655]
+- [Unify the undo log of all snapshot types][69464]
+
+[71848]: https://github.com/rust-lang/rust/issues/71848/
+[73420]: https://github.com/rust-lang/rust/issues/73420/
+[72324]: https://github.com/rust-lang/rust/pull/72324/
+[71843]: https://github.com/rust-lang/rust/pull/71843/
+[71886]: https://github.com/rust-lang/rust/pull/71886/
+[72234]: https://github.com/rust-lang/rust/pull/72234/
+[72239]: https://github.com/rust-lang/rust/pull/72239/
+[72397]: https://github.com/rust-lang/rust/pull/72397/
+[72413]: https://github.com/rust-lang/rust/pull/72413/
+[72014]: https://github.com/rust-lang/rust/pull/72014/
+[72062]: https://github.com/rust-lang/rust/pull/72062/
+[72094]: https://github.com/rust-lang/rust/pull/72094/
+[72133]: https://github.com/rust-lang/rust/pull/72133/
+[67759]: https://github.com/rust-lang/rust/pull/67759/
+[71900]: https://github.com/rust-lang/rust/pull/71900/
+[71928]: https://github.com/rust-lang/rust/pull/71928/
+[71662]: https://github.com/rust-lang/rust/pull/71662/
+[71716]: https://github.com/rust-lang/rust/pull/71716/
+[71447]: https://github.com/rust-lang/rust/pull/71447/
+[71269]: https://github.com/rust-lang/rust/pull/71269/
+[71095]: https://github.com/rust-lang/rust/pull/71095/
+[71140]: https://github.com/rust-lang/rust/pull/71140/
+[70655]: https://github.com/rust-lang/rust/pull/70655/
+[70705]: https://github.com/rust-lang/rust/pull/70705/
+[69984]: https://github.com/rust-lang/rust/pull/69984/
+[69813]: https://github.com/rust-lang/rust/pull/69813/
+[69464]: https://github.com/rust-lang/rust/pull/69464/
+[68717]: https://github.com/rust-lang/rust/pull/68717/
+[cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
+[`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
+[`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
+[`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
+[`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
+[`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
+[`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
+[`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
+[`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
+[`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
+[`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
+[`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
+[`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
+[`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
+[`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
+[`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
+[`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
+
+
+Version 1.44.1 (2020-06-18)
+===========================
+
+* [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
+* [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
+* [Fix crashes when finding backtrace on macOS.][71397]
+* [Clippy applies lint levels into different files.][clippy/5356]
+
+[71397]: https://github.com/rust-lang/rust/issues/71397
+[73078]: https://github.com/rust-lang/rust/issues/73078
+[cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
+[clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
+
+
+Version 1.44.0 (2020-06-04)
+==========================
+
+Language
+--------
+- [You can now use `async/.await` with `#[no_std]` enabled.][69033]
+- [Added the `unused_braces` lint.][70081]
+
+**Syntax-only changes**
+
+- [Expansion-driven outline module parsing][69838]
+```rust
+#[cfg(FALSE)]
+mod foo {
+ mod bar {
+ mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
+ }
+}
+```
+
+These are still rejected semantically, so you will likely receive an error but
+these changes can be seen and parsed by macros and conditional compilation.
+
+Compiler
+--------
+- [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
+ Additionally when in incremental mode rustc defaults to 256 codegen units.
+- [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
+ a panic is thrown.][67502]
+- [Added tier 3\* support for the `aarch64-unknown-none` and
+ `aarch64-unknown-none-softfloat` targets.][68334]
+- [Added tier 3 support for `arm64-apple-tvos` and
+ `x86_64-apple-tvos` targets.][68191]
+
+
+Libraries
+---------
+- [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
+ `vec![]` to be able to be used in `const` contexts.
+- [`convert::Infallible` now implements `Hash`.][70281]
+- [`OsString` now implements `DerefMut` and `IndexMut` returning
+ a `&mut OsStr`.][70048]
+- [Unicode 13 is now supported.][69929]
+- [`String` now implements `From<&mut str>`.][69661]
+- [`IoSlice` now implements `Copy`.][69403]
+- [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
+- [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
+- [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
+ `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
+ integer types.][69373]
+
+Stabilized APIs
+---------------
+- [`PathBuf::with_capacity`]
+- [`PathBuf::capacity`]
+- [`PathBuf::clear`]
+- [`PathBuf::reserve`]
+- [`PathBuf::reserve_exact`]
+- [`PathBuf::shrink_to_fit`]
+- [`f32::to_int_unchecked`]
+- [`f64::to_int_unchecked`]
+- [`Layout::align_to`]
+- [`Layout::pad_to_align`]
+- [`Layout::array`]
+- [`Layout::extend`]
+
+Cargo
+-----
+- [Added the `cargo tree` command which will print a tree graph of
+ your dependencies.][cargo/8062] E.g.
+ ```
+ mdbook v0.3.2 (/Users/src/rust/mdbook)
+ ├── ammonia v3.0.0
+ │ ├── html5ever v0.24.0
+ │ │ ├── log v0.4.8
+ │ │ │ └── cfg-if v0.1.9
+ │ │ ├── mac v0.1.1
+ │ │ └── markup5ever v0.9.0
+ │ │ ├── log v0.4.8 (*)
+ │ │ ├── phf v0.7.24
+ │ │ │ └── phf_shared v0.7.24
+ │ │ │ ├── siphasher v0.2.3
+ │ │ │ └── unicase v1.4.2
+ │ │ │ [build-dependencies]
+ │ │ │ └── version_check v0.1.5
+ ...
+ ```
+ You can also display dependencies on multiple versions of the same crate with
+ `cargo tree -d` (short for `cargo tree --duplicates`).
+
+Misc
+----
+- [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
+ the version in the sidebar.][69494]
+
+Compatibility Notes
+-------------------
+- [Rustc now correctly generates static libraries on Windows GNU targets with
+ the `.a` extension, rather than the previous `.lib`.][70937]
+- [Removed the `-C no_integrated_as` flag from rustc.][70345]
+- [The `file_name` property in JSON output of macro errors now points the actual
+ source file rather than the previous format of `<NAME macros>`.][70969]
+ **Note:** this may not point to a file that actually exists on the user's system.
+- [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
+- [`mem::{zeroed, uninitialised}` will now panic when used with types that do
+ not allow zero initialization such as `NonZeroU8`.][66059] This was
+ previously a warning.
+- [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
+ operator has been defined as a saturating operation.][71269] This was previously
+ undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
+ continue using the current behaviour, which may be desirable in rare performance
+ sensitive situations.
+
+Internal Only
+-------------
+These changes provide no direct user facing benefits, but represent significant
+improvements to the internals and overall performance of rustc and
+related tools.
+
+- [dep_graph Avoid allocating a set on when the number reads are small.][69778]
+- [Replace big JS dict with JSON parsing.][71250]
+
+[69373]: https://github.com/rust-lang/rust/pull/69373/
+[66059]: https://github.com/rust-lang/rust/pull/66059/
+[68191]: https://github.com/rust-lang/rust/pull/68191/
+[68899]: https://github.com/rust-lang/rust/pull/68899/
+[71147]: https://github.com/rust-lang/rust/pull/71147/
+[71250]: https://github.com/rust-lang/rust/pull/71250/
+[70937]: https://github.com/rust-lang/rust/pull/70937/
+[70969]: https://github.com/rust-lang/rust/pull/70969/
+[70632]: https://github.com/rust-lang/rust/pull/70632/
+[70281]: https://github.com/rust-lang/rust/pull/70281/
+[70345]: https://github.com/rust-lang/rust/pull/70345/
+[70048]: https://github.com/rust-lang/rust/pull/70048/
+[70081]: https://github.com/rust-lang/rust/pull/70081/
+[70156]: https://github.com/rust-lang/rust/pull/70156/
+[71269]: https://github.com/rust-lang/rust/pull/71269/
+[69838]: https://github.com/rust-lang/rust/pull/69838/
+[69929]: https://github.com/rust-lang/rust/pull/69929/
+[69661]: https://github.com/rust-lang/rust/pull/69661/
+[69778]: https://github.com/rust-lang/rust/pull/69778/
+[69494]: https://github.com/rust-lang/rust/pull/69494/
+[69403]: https://github.com/rust-lang/rust/pull/69403/
+[69033]: https://github.com/rust-lang/rust/pull/69033/
+[68692]: https://github.com/rust-lang/rust/pull/68692/
+[68334]: https://github.com/rust-lang/rust/pull/68334/
+[67502]: https://github.com/rust-lang/rust/pull/67502/
+[cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
+[`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
+[`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
+[`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
+[`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
+[`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
+[`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
+[`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
+[`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
+[`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
+[`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
+[`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
+[`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
+
+
+Version 1.43.1 (2020-05-07)
+===========================
+
+* [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
+* [Fixed the stabilization of AVX-512 features.][71473]
+* [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
+
+[71430]: https://github.com/rust-lang/rust/pull/71430
+[71473]: https://github.com/rust-lang/rust/issues/71473
+[cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
+
+
+Version 1.43.0 (2020-04-23)
+==========================
+
+Language
+--------
+- [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
+ the type inferred correctly.][68129]
+- [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
+
+**Syntax only changes**
+- [Allow `type Foo: Ord` syntactically.][69361]
+- [Fuse associated and extern items up to defaultness.][69194]
+- [Syntactically allow `self` in all `fn` contexts.][68764]
+- [Merge `fn` syntax + cleanup item parsing.][68728]
+- [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
+ For example, you may now write:
+ ```rust
+ macro_rules! mac_trait {
+ ($i:item) => {
+ trait T { $i }
+ }
+ }
+ mac_trait! {
+ fn foo() {}
+ }
+ ```
+
+These are still rejected *semantically*, so you will likely receive an error but
+these changes can be seen and parsed by macros and
+conditional compilation.
+
+
+Compiler
+--------
+- [You can now pass multiple lint flags to rustc to override the previous
+ flags.][67885] For example; `rustc -D unused -A unused-variables` denies
+ everything in the `unused` lint group except `unused-variables` which
+ is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
+ everything in the `unused` lint group **including** `unused-variables` since
+ the allow flag is specified before the deny flag (and therefore overridden).
+- [rustc will now prefer your system MinGW libraries over its bundled libraries
+ if they are available on `windows-gnu`.][67429]
+- [rustc now buffers errors/warnings printed in JSON.][69227]
+
+Libraries
+---------
+- [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
+ `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
+ respectively.][69538] **Note** These conversions are only available when `N`
+ is `0..=32`.
+- [You can now use associated constants on floats and integers directly, rather
+ than having to import the module.][68952] e.g. You can now write `u32::MAX` or
+ `f32::NAN` with no imports.
+- [`u8::is_ascii` is now `const`.][68984]
+- [`String` now implements `AsMut<str>`.][68742]
+- [Added the `primitive` module to `std` and `core`.][67637] This module
+ reexports Rust's primitive types. This is mainly useful in macros
+ where you want avoid these types being shadowed.
+- [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
+- [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
+
+Stabilized APIs
+---------------
+- [`Once::is_completed`]
+- [`f32::LOG10_2`]
+- [`f32::LOG2_10`]
+- [`f64::LOG10_2`]
+- [`f64::LOG2_10`]
+- [`iter::once_with`]
+
+Cargo
+-----
+- [You can now set config `[profile]`s in your `.cargo/config`, or through
+ your environment.][cargo/7823]
+- [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
+ executable path when running integration tests or benchmarks.][cargo/7697]
+ `<name>` is the name of your binary as-is e.g. If you wanted the executable
+ path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
+
+Misc
+----
+- [Certain checks in the `const_err` lint were deemed unrelated to const
+ evaluation][69185], and have been moved to the `unconditional_panic` and
+ `arithmetic_overflow` lints.
+
+Compatibility Notes
+-------------------
+
+- [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
+ has been a warning since 1.36.0.
+- [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
+ led to some instances being accepted, and now correctly emits a hard error.
+
+[69340]: https://github.com/rust-lang/rust/pull/69340
+
+Internal Only
+-------------
+These changes provide no direct user facing benefits, but represent significant
+improvements to the internals and overall performance of `rustc` and
+related tools.
+
+- [All components are now built with `opt-level=3` instead of `2`.][67878]
+- [Improved how rustc generates drop code.][67332]
+- [Improved performance from `#[inline]`-ing certain hot functions.][69256]
+- [traits: preallocate 2 Vecs of known initial size][69022]
+- [Avoid exponential behaviour when relating types][68772]
+- [Skip `Drop` terminators for enum variants without drop glue][68943]
+- [Improve performance of coherence checks][68966]
+- [Deduplicate types in the generator witness][68672]
+- [Invert control in struct_lint_level.][68725]
+
+[67332]: https://github.com/rust-lang/rust/pull/67332/
+[67429]: https://github.com/rust-lang/rust/pull/67429/
+[67637]: https://github.com/rust-lang/rust/pull/67637/
+[67642]: https://github.com/rust-lang/rust/pull/67642/
+[67878]: https://github.com/rust-lang/rust/pull/67878/
+[67885]: https://github.com/rust-lang/rust/pull/67885/
+[68129]: https://github.com/rust-lang/rust/pull/68129/
+[68672]: https://github.com/rust-lang/rust/pull/68672/
+[68725]: https://github.com/rust-lang/rust/pull/68725/
+[68728]: https://github.com/rust-lang/rust/pull/68728/
+[68738]: https://github.com/rust-lang/rust/pull/68738/
+[68742]: https://github.com/rust-lang/rust/pull/68742/
+[68764]: https://github.com/rust-lang/rust/pull/68764/
+[68772]: https://github.com/rust-lang/rust/pull/68772/
+[68943]: https://github.com/rust-lang/rust/pull/68943/
+[68952]: https://github.com/rust-lang/rust/pull/68952/
+[68966]: https://github.com/rust-lang/rust/pull/68966/
+[68984]: https://github.com/rust-lang/rust/pull/68984/
+[69022]: https://github.com/rust-lang/rust/pull/69022/
+[69185]: https://github.com/rust-lang/rust/pull/69185/
+[69194]: https://github.com/rust-lang/rust/pull/69194/
+[69201]: https://github.com/rust-lang/rust/pull/69201/
+[69227]: https://github.com/rust-lang/rust/pull/69227/
+[69548]: https://github.com/rust-lang/rust/pull/69548/
+[69256]: https://github.com/rust-lang/rust/pull/69256/
+[69361]: https://github.com/rust-lang/rust/pull/69361/
+[69366]: https://github.com/rust-lang/rust/pull/69366/
+[69538]: https://github.com/rust-lang/rust/pull/69538/
+[cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
+[cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
+[`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
+[`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
+[`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
+[`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
+[`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
+[`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
+
+
+Version 1.42.0 (2020-03-12)
+==========================
+
+Language
+--------
+- [You can now use the slice pattern syntax with subslices.][67712] e.g.
+ ```rust
+ fn foo(words: &[&str]) {
+ match words {
+ ["Hello", "World", "!", ..] => println!("Hello World!"),
+ ["Foo", "Bar", ..] => println!("Baz"),
+ rest => println!("{:?}", rest),
+ }
+ }
+ ```
+- [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
+ that you can create an enum that has the exact layout and ABI of the type
+ it contains.
+- [You can now use outer attribute procedural macros on inline modules.][64273]
+- [There are some *syntax-only* changes:][67131]
+ - `default` is syntactically allowed before items in `trait` definitions.
+ - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
+ leave out their bodies in favor of `;`.
+ - Bounds on associated types in `impl`s are now syntactically allowed
+ (e.g. `type Foo: Ord;`).
+ - `...` (the C-variadic type) may occur syntactically directly as the type of
+ any function parameter.
+
+ These are still rejected *semantically*, so you will likely receive an error
+ but these changes can be seen and parsed by procedural macros and
+ conditional compilation.
+
+Compiler
+--------
+- [Added tier 2\* support for `armv7a-none-eabi`.][68253]
+- [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
+- [`Option::{expect,unwrap}` and
+ `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
+ pointing to the location where they were called, rather than
+ `core`'s internals. ][67887]
+
+\* Refer to Rust's [platform support page][platform-support-doc] for more
+information on Rust's tiered platform support.
+
+Libraries
+---------
+- [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
+- [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
+ to implement `Sized`.][67935]
+- [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
+- [`Layout::new` is now `const`.][66254]
+- [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
+
+
+Stabilized APIs
+---------------
+- [`CondVar::wait_while`]
+- [`CondVar::wait_timeout_while`]
+- [`DebugMap::key`]
+- [`DebugMap::value`]
+- [`ManuallyDrop::take`]
+- [`matches!`]
+- [`ptr::slice_from_raw_parts_mut`]
+- [`ptr::slice_from_raw_parts`]
+
+Cargo
+-----
+- [You no longer need to include `extern crate proc_macro;` to be able to
+ `use proc_macro;` in the `2018` edition.][cargo/7700]
+
+Compatibility Notes
+-------------------
+- [`Error::description` has been deprecated, and its use will now produce a
+ warning.][66919] It's recommended to use `Display`/`to_string` instead.
+
+[68253]: https://github.com/rust-lang/rust/pull/68253/
+[68348]: https://github.com/rust-lang/rust/pull/68348/
+[67935]: https://github.com/rust-lang/rust/pull/67935/
+[68339]: https://github.com/rust-lang/rust/pull/68339/
+[68122]: https://github.com/rust-lang/rust/pull/68122/
+[64273]: https://github.com/rust-lang/rust/pull/64273/
+[67712]: https://github.com/rust-lang/rust/pull/67712/
+[67887]: https://github.com/rust-lang/rust/pull/67887/
+[67131]: https://github.com/rust-lang/rust/pull/67131/
+[67233]: https://github.com/rust-lang/rust/pull/67233/
+[66899]: https://github.com/rust-lang/rust/pull/66899/
+[66919]: https://github.com/rust-lang/rust/pull/66919/
+[66254]: https://github.com/rust-lang/rust/pull/66254/
+[cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
+[`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
+[`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
+[`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
+[`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
+[`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
+[`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
+[`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
+[`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
+
+
+Version 1.41.1 (2020-02-27)
+===========================
+
+* [Always check types of static items][69145]
+* [Always check lifetime bounds of `Copy` impls][69145]
+* [Fix miscompilation in callers of `Layout::repeat`][69225]
+* [Rust 1.41.0 was announced as the last Rust release with tier 1 or tier 2 support for 32-bit Apple targets][apple-32bit-drop].
+ That announcement did not expect a patch release. 1.41.1 also includes release binaries for these targets.
+
+[69225]: https://github.com/rust-lang/rust/issues/69225
+[69145]: https://github.com/rust-lang/rust/pull/69145
+
+
+Version 1.41.0 (2020-01-30)
+===========================
+
+Language
+--------
+
+- [You can now pass type parameters to foreign items when implementing
+ traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
+- [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
+ now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
+ `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
+- [You can now use any valid identifier in a `format_args` macro.][66847]
+ Previously identifiers starting with an underscore were not allowed.
+- [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
+ enum variants.][66183] These are still rejected semantically, but
+ can be seen and parsed by procedural macros and conditional compilation.
+- [You can now define a Rust `extern "C"` function with `Box<T>` and use `T*` as the corresponding
+ type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information,
+ including the important caveat about preferring to avoid `Box<T>` in Rust signatures for functions defined in C.
+
+[box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout
+
+Compiler
+--------
+
+- [Rustc will now warn if you have unused loop `'label`s.][66325]
+- [Removed support for the `i686-unknown-dragonfly` target.][67255]
+- [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
+- [You can now pass an arguments file passing the `@path` syntax
+ to rustc.][66172] Note that the format differs somewhat from what is
+ found in other tooling; please see [the documentation][argfile-docs] for
+ more information.
+- [You can now provide `--extern` flag without a path, indicating that it is
+ available from the search path or specified with an `-L` flag.][64882]
+
+\* Refer to Rust's [platform support page][platform-support-doc] for more
+information on Rust's tiered platform support.
+
+[argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
+
+Libraries
+---------
+
+- [The `core::panic` module is now stable.][66771] It was already stable
+ through `std`.
+- [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
+ width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
+- [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
+
+Stabilized APIs
+---------------
+
+- [`Result::map_or`]
+- [`Result::map_or_else`]
+- [`std::rc::Weak::weak_count`]
+- [`std::rc::Weak::strong_count`]
+- [`std::sync::Weak::weak_count`]
+- [`std::sync::Weak::strong_count`]
+
+Cargo
+-----
+
+- [Cargo will now document all the private items for binary crates
+ by default.][cargo/7593]
+- [`cargo-install` will now reinstall the package if it detects that it is out
+ of date.][cargo/7560]
+- [Cargo.lock now uses a more git friendly format that should help to reduce
+ merge conflicts.][cargo/7579]
+- [You can now override specific dependencies's build settings][cargo/7591] E.g.
+ `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
+ optimisation level to `2` for debug builds. You can also use
+ `[profile.<profile>.build-override]` to override build scripts and
+ their dependencies.
+
+Misc
+----
+
+- [You can now specify `edition` in documentation code blocks to compile the block
+ for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
+ should be compiled the 2018 edition of Rust.
+- [You can now provide custom themes to rustdoc with `--theme`, and check the
+ current theme with `--check-theme`.][54733]
+- [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
+
+Compatibility Notes
+-------------------
+
+- [As previously announced 1.41 will be the last tier 1 release for 32-bit
+ Apple targets.][apple-32bit-drop] This means that the source code is still
+ available to build, but the targets are no longer being tested and release
+ binaries for those platforms will no longer be distributed by the Rust project.
+ Please refer to the linked blog post for more information.
+
+[54733]: https://github.com/rust-lang/rust/pull/54733/
+[61351]: https://github.com/rust-lang/rust/pull/61351/
+[62514]: https://github.com/rust-lang/rust/pull/62514/
+[67255]: https://github.com/rust-lang/rust/pull/67255/
+[66661]: https://github.com/rust-lang/rust/pull/66661/
+[66771]: https://github.com/rust-lang/rust/pull/66771/
+[66847]: https://github.com/rust-lang/rust/pull/66847/
+[66238]: https://github.com/rust-lang/rust/pull/66238/
+[66277]: https://github.com/rust-lang/rust/pull/66277/
+[66325]: https://github.com/rust-lang/rust/pull/66325/
+[66172]: https://github.com/rust-lang/rust/pull/66172/
+[66183]: https://github.com/rust-lang/rust/pull/66183/
+[65879]: https://github.com/rust-lang/rust/pull/65879/
+[65013]: https://github.com/rust-lang/rust/pull/65013/
+[64882]: https://github.com/rust-lang/rust/pull/64882/
+[64325]: https://github.com/rust-lang/rust/pull/64325/
+[cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
+[cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
+[cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
+[cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
+[`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
+[`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
+[`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
+[`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
+[`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
+[`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
+[apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
+
+Version 1.40.0 (2019-12-19)
+===========================
+
+Language
+--------
+- [You can now use tuple `struct`s and tuple `enum` variant's constructors in
+ `const` contexts.][65188] e.g.
+
+ ```rust
+ pub struct Point(i32, i32);
+
+ const ORIGIN: Point = {
+ let constructor = Point;
+
+ constructor(0, 0)
+ };
+ ```
+
+- [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
+ indicate that there may be variants or fields added in the future.][64639]
+ For example this requires adding a wild-card branch (`_ => {}`) to any match
+ statements on a non-exhaustive `enum`. [(RFC 2008)]
+- [You can now use function-like procedural macros in `extern` blocks and in
+ type positions.][63931] e.g. `type Generated = macro!();`
+- [Function-like and attribute procedural macros can now emit
+ `macro_rules!` items, so you can now have your macros generate macros.][64035]
+- [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
+ attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
+ `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
+
+Compiler
+--------
+- [Added tier 3 support\* for the
+ `thumbv7neon-unknown-linux-musleabihf` target.][66103]
+- [Added tier 3 support for the
+ `aarch64-unknown-none-softfloat` target.][64589]
+- [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
+ `mips64el-unknown-linux-muslabi64` targets.][65843]
+
+\* Refer to Rust's [platform support page][platform-support-doc] for more
+ information on Rust's tiered platform support.
+
+Libraries
+---------
+- [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
+
+Stabilized APIs
+---------------
+- [`BTreeMap::get_key_value`]
+- [`HashMap::get_key_value`]
+- [`Option::as_deref_mut`]
+- [`Option::as_deref`]
+- [`Option::flatten`]
+- [`UdpSocket::peer_addr`]
+- [`f32::to_be_bytes`]
+- [`f32::to_le_bytes`]
+- [`f32::to_ne_bytes`]
+- [`f64::to_be_bytes`]
+- [`f64::to_le_bytes`]
+- [`f64::to_ne_bytes`]
+- [`f32::from_be_bytes`]
+- [`f32::from_le_bytes`]
+- [`f32::from_ne_bytes`]
+- [`f64::from_be_bytes`]
+- [`f64::from_le_bytes`]
+- [`f64::from_ne_bytes`]
+- [`mem::take`]
+- [`slice::repeat`]
+- [`todo!`]
+
+Cargo
+-----
+- [Cargo will now always display warnings, rather than only on
+ fresh builds.][cargo/7450]
+- [Feature flags (except `--all-features`) passed to a virtual workspace will
+ now produce an error.][cargo/7507] Previously these flags were ignored.
+- [You can now publish `dev-dependencies` without including
+ a `version`.][cargo/7333]
+
+Misc
+----
+- [You can now specify the `#[cfg(doctest)]` attribute to include an item only
+ when running documentation tests with `rustdoc`.][63803]
+
+Compatibility Notes
+-------------------
+- [As previously announced, any previous NLL warnings in the 2015 edition are
+ now hard errors.][64221]
+- [The `include!` macro will now warn if it failed to include the
+ entire file.][64284] The `include!` macro unintentionally only includes the
+ first _expression_ in a file, and this can be unintuitive. This will become
+ either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
+- [Using `#[inline]` on function prototypes and consts now emits a warning under
+ `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
+ or `extern` blocks now correctly emits a hard error.
+
+[65294]: https://github.com/rust-lang/rust/pull/65294/
+[66103]: https://github.com/rust-lang/rust/pull/66103/
+[65843]: https://github.com/rust-lang/rust/pull/65843/
+[65188]: https://github.com/rust-lang/rust/pull/65188/
+[65092]: https://github.com/rust-lang/rust/pull/65092/
+[64589]: https://github.com/rust-lang/rust/pull/64589/
+[64639]: https://github.com/rust-lang/rust/pull/64639/
+[64221]: https://github.com/rust-lang/rust/pull/64221/
+[64284]: https://github.com/rust-lang/rust/pull/64284/
+[63931]: https://github.com/rust-lang/rust/pull/63931/
+[64035]: https://github.com/rust-lang/rust/pull/64035/
+[63674]: https://github.com/rust-lang/rust/pull/63674/
+[63803]: https://github.com/rust-lang/rust/pull/63803/
+[cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
+[cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
+[cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
+[(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
+[`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
+[`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
+[`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
+[`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
+[`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
+[`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
+[`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
+[`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
+[`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
+[`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
+[`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
+[`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
+[`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
+[`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
+[`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
+[`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
+[`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
+[`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
+[`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
+[`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
+[`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
+
+
+Version 1.39.0 (2019-11-07)
+===========================
+
+Language
+--------
+- [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
+ `async {}` respectively, and you can now call `.await` on async expressions.][63209]
+- [You can now use certain attributes on function, closure, and function pointer
+ parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
+ `deny`, `forbid` as well as inert helper attributes used by procedural macro
+ attributes applied to items. e.g.
+ ```rust
+ fn len(
+ #[cfg(windows)] slice: &[u16],
+ #[cfg(not(windows))] slice: &[u8],
+ ) -> usize {
+ slice.len()
+ }
+ ```
+- [You can now take shared references to bind-by-move patterns in the `if` guards
+ of `match` arms.][63118] e.g.
+ ```rust
+ fn main() {
+ let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
+
+ match array {
+ nums
+ // ---- `nums` is bound by move.
+ if nums.iter().sum::<u8>() == 10
+ // ^------ `.iter()` implicitly takes a reference to `nums`.
+ => {
+ drop(nums);
+ // ----------- Legal as `nums` was bound by move and so we have ownership.
+ }
+ _ => unreachable!(),
+ }
+ }
+ ```
+
+
+
+Compiler
+--------
+- [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
+- [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
+- [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
+ **Note** Cargo currently doesn't use this feature. Refer to
+ [cargo#7315][cargo/7315] to track this feature's progress.
+- [You can now pass `--show-output` argument to test binaries to print the
+ output of successful tests.][62600]
+
+
+\* Refer to Rust's [platform support page][platform-support-doc] for more
+information on Rust's tiered platform support.
+
+Libraries
+---------
+- [`Vec::new` and `String::new` are now `const` functions.][64028]
+- [`LinkedList::new` is now a `const` function.][63684]
+- [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
+- [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
+ now `const`.][63786]
+
+Stabilized APIs
+---------------
+- [`Pin::into_inner`]
+- [`Instant::checked_duration_since`]
+- [`Instant::saturating_duration_since`]
+
+Cargo
+-----
+- [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
+- [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
+ `--all` is now deprecated.
+
+Misc
+----
+- [You can now pass `-Clinker` to rustdoc to control the linker used
+ for compiling doctests.][63834]
+
+Compatibility Notes
+-------------------
+- [Code that was previously accepted by the old borrow checker, but rejected by
+ the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
+ previously a warning, and will also become a hard error in the Rust 2015
+ edition in the 1.40.0 release.
+- [`rustdoc` now requires `rustc` to be installed and in the same directory to
+ run tests.][63827] This should improve performance when running a large
+ amount of doctests.
+- [The `try!` macro will now issue a deprecation warning.][62672] It is
+ recommended to use the `?` operator instead.
+- [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
+ returned `0.0`.
+
+[62600]: https://github.com/rust-lang/rust/pull/62600/
+[62672]: https://github.com/rust-lang/rust/pull/62672/
+[63118]: https://github.com/rust-lang/rust/pull/63118/
+[63209]: https://github.com/rust-lang/rust/pull/63209/
+[63402]: https://github.com/rust-lang/rust/pull/63402/
+[63565]: https://github.com/rust-lang/rust/pull/63565/
+[63595]: https://github.com/rust-lang/rust/pull/63595/
+[63684]: https://github.com/rust-lang/rust/pull/63684/
+[63698]: https://github.com/rust-lang/rust/pull/63698/
+[63770]: https://github.com/rust-lang/rust/pull/63770/
+[63786]: https://github.com/rust-lang/rust/pull/63786/
+[63827]: https://github.com/rust-lang/rust/pull/63827/
+[63834]: https://github.com/rust-lang/rust/pull/63834/
+[64010]: https://github.com/rust-lang/rust/pull/64010/
+[64028]: https://github.com/rust-lang/rust/pull/64028/
+[64334]: https://github.com/rust-lang/rust/pull/64334/
+[cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
+[cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
+[cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
+[`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
+[`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
+[`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
+
+Version 1.38.0 (2019-09-26)
+==========================
+
+Language
+--------
+- [The `#[global_allocator]` attribute can now be used in submodules.][62735]
+- [The `#[deprecated]` attribute can now be used on macros.][62042]
+
+Compiler
+--------
+- [Added pipelined compilation support to `rustc`.][62766] This will
+ improve compilation times in some cases. For further information please refer
+ to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
+- [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
+ `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
+ `x86_64-uwp-windows-msvc` targets.][60260]
+- [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
+ `armv7-unknown-linux-musleabi` targets.][63107]
+- [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
+- [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
+- [Upgraded to LLVM 9.][62592]
+
+\* Refer to Rust's [platform support page][platform-support-doc] for more
+information on Rust's tiered platform support.
+
+Libraries
+---------
+- [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
+- [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
+ available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
+ is available at `std::clone::Clone`). This also makes all built-in macros
+ available in `std`/`core` root. e.g. `std::include_bytes!`.
+- [`str::Chars` now implements `Debug`.][63000]
+- [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
+- [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
+- [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
+- [Added euclidean remainder and division operations (`div_euclid`,
+ `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
+ `overflowing`, and `wrapping` versions are available for all
+ integer primitives.
+- [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
+ `PartialEq`.][61491]
+- [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
+
+Stabilized APIs
+---------------
+- [`<*const T>::cast`]
+- [`<*mut T>::cast`]
+- [`Duration::as_secs_f32`]
+- [`Duration::as_secs_f64`]
+- [`Duration::div_f32`]
+- [`Duration::div_f64`]
+- [`Duration::from_secs_f32`]
+- [`Duration::from_secs_f64`]
+- [`Duration::mul_f32`]
+- [`Duration::mul_f64`]
+- [`any::type_name`]
+
+Cargo
+-----
+- [Added pipelined compilation support to `cargo`.][cargo/7143]
+- [You can now pass the `--features` option multiple times to enable
+ multiple features.][cargo/7084]
+
+Rustdoc
+-------
+
+- [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
+
+Misc
+----
+- [`rustc` will now warn about some incorrect uses of
+ `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
+
+Compatibility Notes
+-------------------
+- The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
+ 1.38.0.
+- The [`armv7-unknown-linux-gnueabihf` platform is known to have
+ issues][62896] with certain crates such as libc.
+
+[60260]: https://github.com/rust-lang/rust/pull/60260/
+[61457]: https://github.com/rust-lang/rust/pull/61457/
+[61491]: https://github.com/rust-lang/rust/pull/61491/
+[61884]: https://github.com/rust-lang/rust/pull/61884/
+[61953]: https://github.com/rust-lang/rust/pull/61953/
+[62042]: https://github.com/rust-lang/rust/pull/62042/
+[62528]: https://github.com/rust-lang/rust/pull/62528/
+[62583]: https://github.com/rust-lang/rust/pull/62583/
+[62735]: https://github.com/rust-lang/rust/pull/62735/
+[62766]: https://github.com/rust-lang/rust/pull/62766/
+[62784]: https://github.com/rust-lang/rust/pull/62784/
+[62592]: https://github.com/rust-lang/rust/pull/62592/
+[62785]: https://github.com/rust-lang/rust/issues/62785/
+[62814]: https://github.com/rust-lang/rust/pull/62814/
+[62896]: https://github.com/rust-lang/rust/issues/62896/
+[63000]: https://github.com/rust-lang/rust/pull/63000/
+[63056]: https://github.com/rust-lang/rust/pull/63056/
+[63107]: https://github.com/rust-lang/rust/pull/63107/
+[63346]: https://github.com/rust-lang/rust/pull/63346/
+[63421]: https://github.com/rust-lang/rust/pull/63421/
+[cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
+[cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
+[63048]: https://github.com/rust-lang/rust/pull/63048
+[`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
+[`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
+[`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
+[`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
+[`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
+[`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
+[`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
+[`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
+[`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
+[`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
+[`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
+[platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
+[pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
+
+Version 1.37.0 (2019-08-15)
+==========================
+
+Language
+--------
+- `#[must_use]` will now warn if the type is contained in a [tuple][61100],
+ [`Box`][62228], or an [array][62235] and unused.
+- [You can now use the `cfg` and `cfg_attr` attributes on
+ generic parameters.][61547]
+- [You can now use enum variants through type alias.][61682] e.g. You can
+ write the following:
+ ```rust
+ type MyOption = Option<u8>;
+
+ fn increment_or_zero(x: MyOption) -> u8 {
+ match x {
+ MyOption::Some(y) => y + 1,
+ MyOption::None => 0,
+ }
+ }
+ ```
+- [You can now use `_` as an identifier for consts.][61347] e.g. You can write
+ `const _: u32 = 5;`.
+- [You can now use `#[repr(align(X)]` on enums.][61229]
+- [The `?` Kleene macro operator is now available in the
+ 2015 edition.][60932]
+
+Compiler
+--------
+- [You can now enable Profile-Guided Optimization with the `-C profile-generate`
+ and `-C profile-use` flags.][61268] For more information on how to use profile
+ guided optimization, please refer to the [rustc book][rustc-book-pgo].
+- [The `rust-lldb` wrapper script should now work again.][61827]
+
+Libraries
+---------
+- [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
+
+Stabilized APIs
+---------------
+- [`BufReader::buffer`]
+- [`BufWriter::buffer`]
+- [`Cell::from_mut`]
+- [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
+- [`DoubleEndedIterator::nth_back`]
+- [`Option::xor`]
+- [`Wrapping::reverse_bits`]
+- [`i128::reverse_bits`]
+- [`i16::reverse_bits`]
+- [`i32::reverse_bits`]
+- [`i64::reverse_bits`]
+- [`i8::reverse_bits`]
+- [`isize::reverse_bits`]
+- [`slice::copy_within`]
+- [`u128::reverse_bits`]
+- [`u16::reverse_bits`]
+- [`u32::reverse_bits`]
+- [`u64::reverse_bits`]
+- [`u8::reverse_bits`]
+- [`usize::reverse_bits`]
+
+Cargo
+-----
+- [`Cargo.lock` files are now included by default when publishing executable crates
+ with executables.][cargo/7026]
+- [You can now specify `default-run="foo"` in `[package]` to specify the
+ default executable to use for `cargo run`.][cargo/7056]
+
+Misc
+----
+
+Compatibility Notes
+-------------------
+- [Using `...` for inclusive range patterns will now warn by default.][61342]
+ Please transition your code to using the `..=` syntax for inclusive
+ ranges instead.
+- [Using a trait object without the `dyn` will now warn by default.][61203]
+ Please transition your code to use `dyn Trait` for trait objects instead.
+
+[62228]: https://github.com/rust-lang/rust/pull/62228/
+[62235]: https://github.com/rust-lang/rust/pull/62235/
+[61802]: https://github.com/rust-lang/rust/pull/61802/
+[61827]: https://github.com/rust-lang/rust/pull/61827/
+[61547]: https://github.com/rust-lang/rust/pull/61547/
+[61682]: https://github.com/rust-lang/rust/pull/61682/
+[61268]: https://github.com/rust-lang/rust/pull/61268/
+[61342]: https://github.com/rust-lang/rust/pull/61342/
+[61347]: https://github.com/rust-lang/rust/pull/61347/
+[61100]: https://github.com/rust-lang/rust/pull/61100/
+[61203]: https://github.com/rust-lang/rust/pull/61203/
+[61229]: https://github.com/rust-lang/rust/pull/61229/
+[60932]: https://github.com/rust-lang/rust/pull/60932/
+[cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
+[cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
+[`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
+[`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
+[`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
+[`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
+[`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
+[`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
+[`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
+[`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
+[`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
+[`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
+[`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
+[`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
+[`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
+[`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
+[`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
+[`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
+[`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
+[`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
+[`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
+[`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
+[rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
+
+
+Version 1.36.0 (2019-07-04)
+==========================
+
+Language
+--------
+- [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
+- [The order of traits in trait objects no longer affects the semantics of that
+ object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
+ `dyn fmt::Debug + Send`, where this was previously not the case.
+
+Libraries
+---------
+- [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
+- [`TryFromSliceError` now implements `From<Infallible>`.][60318]
+- [`mem::needs_drop` is now available as a const fn.][60364]
+- [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
+- [`String` now implements `BorrowMut<str>`.][60404]
+- [`io::Cursor` now implements `Default`.][60234]
+- [Both `NonNull::{dangling, cast}` are now const fns.][60244]
+- [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
+ of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
+ environment has access to heap memory allocation.
+- [`String` now implements `From<&String>`.][59825]
+- [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
+ return a tuple of each argument when there is multiple arguments.
+- [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
+ not used.][59648]
+
+Stabilized APIs
+---------------
+- [`VecDeque::rotate_left`]
+- [`VecDeque::rotate_right`]
+- [`Iterator::copied`]
+- [`io::IoSlice`]
+- [`io::IoSliceMut`]
+- [`Read::read_vectored`]
+- [`Write::write_vectored`]
+- [`str::as_mut_ptr`]
+- [`mem::MaybeUninit`]
+- [`pointer::align_offset`]
+- [`future::Future`]
+- [`task::Context`]
+- [`task::RawWaker`]
+- [`task::RawWakerVTable`]
+- [`task::Waker`]
+- [`task::Poll`]
+
+Cargo
+-----
+- [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
+- [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
+
+You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
+
+Clippy
+------
+There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
+
+Misc
+----
+
+Compatibility Notes
+-------------------
+- With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
+ longer recommended, and will be deprecated in 1.39.0.
+
+[60318]: https://github.com/rust-lang/rust/pull/60318/
+[60364]: https://github.com/rust-lang/rust/pull/60364/
+[60370]: https://github.com/rust-lang/rust/pull/60370/
+[60404]: https://github.com/rust-lang/rust/pull/60404/
+[60234]: https://github.com/rust-lang/rust/pull/60234/
+[60244]: https://github.com/rust-lang/rust/pull/60244/
+[58623]: https://github.com/rust-lang/rust/pull/58623/
+[59648]: https://github.com/rust-lang/rust/pull/59648/
+[59675]: https://github.com/rust-lang/rust/pull/59675/
+[59825]: https://github.com/rust-lang/rust/pull/59825/
+[59826]: https://github.com/rust-lang/rust/pull/59826/
+[59445]: https://github.com/rust-lang/rust/pull/59445/
+[59114]: https://github.com/rust-lang/rust/pull/59114/
+[cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
+[cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
+[`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
+[`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
+[`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
+[`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
+[`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
+[`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
+[`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
+[`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
+[`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
+[`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
+[`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
+[`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
+[`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
+[`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
+[`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
+[`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
+[clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
+[cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
+
+
+Version 1.35.0 (2019-05-23)
+==========================
+
+Language
+--------
+- [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
+ `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
+- [You can now coerce closures into unsafe function pointers.][59580] e.g.
+ ```rust
+ unsafe fn call_unsafe(func: unsafe fn()) {
+ func()
+ }
+
+ pub fn main() {
+ unsafe { call_unsafe(|| {}); }
+ }
+ ```
+
+
+Compiler
+--------
+- [Added the `armv6-unknown-freebsd-gnueabihf` and
+ `armv7-unknown-freebsd-gnueabihf` targets.][58080]
+- [Added the `wasm32-unknown-wasi` target.][59464]
+
+
+Libraries
+---------
+- [`Thread` will now show its ID in `Debug` output.][59460]
+- [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
+- [`alloc::System` now implements `Default`.][59451]
+- [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
+ last field.][59076]
+- [`char::{ToLowercase, ToUppercase}` now
+ implement `ExactSizeIterator`.][58778]
+- [All `NonZero` numeric types now implement `FromStr`.][58717]
+- [Removed the `Read` trait bounds
+ on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
+- [You can now call the `dbg!` macro without any parameters to print the file
+ and line where it is called.][57847]
+- [In place ASCII case conversions are now up to 4× faster.][59283]
+ e.g. `str::make_ascii_lowercase`
+- [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
+ and `Send`.][58369]
+
+Stabilized APIs
+---------------
+- [`f32::copysign`]
+- [`f64::copysign`]
+- [`RefCell::replace_with`]
+- [`RefCell::map_split`]
+- [`ptr::hash`]
+- [`Range::contains`]
+- [`RangeFrom::contains`]
+- [`RangeTo::contains`]
+- [`RangeInclusive::contains`]
+- [`RangeToInclusive::contains`]
+- [`Option::copied`]
+
+Cargo
+-----
+- [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
+ linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
+ platform specific.
+
+Misc
+----
+- [The Rust toolchain is now available natively for musl based distros.][58575]
+
+[59460]: https://github.com/rust-lang/rust/pull/59460/
+[59464]: https://github.com/rust-lang/rust/pull/59464/
+[59500]: https://github.com/rust-lang/rust/pull/59500/
+[59512]: https://github.com/rust-lang/rust/pull/59512/
+[59580]: https://github.com/rust-lang/rust/pull/59580/
+[59283]: https://github.com/rust-lang/rust/pull/59283/
+[59451]: https://github.com/rust-lang/rust/pull/59451/
+[59076]: https://github.com/rust-lang/rust/pull/59076/
+[58778]: https://github.com/rust-lang/rust/pull/58778/
+[58717]: https://github.com/rust-lang/rust/pull/58717/
+[58369]: https://github.com/rust-lang/rust/pull/58369/
+[58423]: https://github.com/rust-lang/rust/pull/58423/
+[58080]: https://github.com/rust-lang/rust/pull/58080/
+[57847]: https://github.com/rust-lang/rust/pull/57847/
+[58575]: https://github.com/rust-lang/rust/pull/58575
+[cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
+[`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
+[`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
+[`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
+[`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
+[`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
+[`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
+[`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
+[`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
+[`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
+[`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
+[`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
+
+Version 1.34.2 (2019-05-14)
+===========================
+
+* [Destabilize the `Error::type_id` function due to a security
+ vulnerability][60785] ([CVE-2019-12083])
+
+[60785]: https://github.com/rust-lang/rust/pull/60785
+[CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
+
+Version 1.34.1 (2019-04-25)
+===========================
+
+* [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
+* [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
+* [Fix Clippy panic when checking some macros][clippy/3805]
+
+[clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
+[clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
+[clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
+
+Version 1.34.0 (2019-04-11)
+==========================
+
+Language
+--------
+- [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
+ `#[deprecated(note = "reason")]`. This was previously allowed by mistake
+ but had no effect.
+- [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
+ `#[attr{}]` procedural macros.][57367]
+- [You can now write `extern crate self as foo;`][57407] to import your
+ crate's root into the extern prelude.
+
+
+Compiler
+--------
+- [You can now target `riscv64imac-unknown-none-elf` and
+ `riscv64gc-unknown-none-elf`.][58406]
+- [You can now enable linker plugin LTO optimisations with
+ `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
+ into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
+ boundaries.
+- [You can now target `powerpc64-unknown-freebsd`.][57809]
+
+
+Libraries
+---------
+- [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
+ `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
+ the `Hash` trait to create an iterator.
+- [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
+ methods.][58421] Most notably you no longer require the `Ord` trait to create
+ an iterator.
+- [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
+ for all numeric types.][58044]
+- [Indexing a `str` is now generic over all types that
+ implement `SliceIndex<str>`.][57604]
+- [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
+ `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
+ produce a warning if their returning type is unused.
+- [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
+ `overflowing_pow` are now available for all numeric types.][57873] These are
+ equivalent to methods such as `wrapping_add` for the `pow` operation.
+
+
+Stabilized APIs
+---------------
+
+#### std & core
+* [`Any::type_id`]
+* [`Error::type_id`]
+* [`atomic::AtomicI16`]
+* [`atomic::AtomicI32`]
+* [`atomic::AtomicI64`]
+* [`atomic::AtomicI8`]
+* [`atomic::AtomicU16`]
+* [`atomic::AtomicU32`]
+* [`atomic::AtomicU64`]
+* [`atomic::AtomicU8`]
+* [`convert::Infallible`]
+* [`convert::TryFrom`]
+* [`convert::TryInto`]
+* [`iter::from_fn`]
+* [`iter::successors`]
+* [`num::NonZeroI128`]
+* [`num::NonZeroI16`]
+* [`num::NonZeroI32`]
+* [`num::NonZeroI64`]
+* [`num::NonZeroI8`]
+* [`num::NonZeroIsize`]
+* [`slice::sort_by_cached_key`]
+* [`str::escape_debug`]
+* [`str::escape_default`]
+* [`str::escape_unicode`]
+* [`str::split_ascii_whitespace`]
+
+#### std
+* [`Instant::checked_add`]
+* [`Instant::checked_sub`]
+* [`SystemTime::checked_add`]
+* [`SystemTime::checked_sub`]
+
+Cargo
+-----
+- [You can now use alternative registries to crates.io.][cargo/6654]
+
+Misc
+----
+- [You can now use the `?` operator in your documentation tests without manually
+ adding `fn main() -> Result<(), _> {}`.][56470]
+
+Compatibility Notes
+-------------------
+- [`Command::before_exec` is being replaced by the unsafe method
+ `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
+- [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
+ can now use `const` functions in `static` variables.
+
+[58370]: https://github.com/rust-lang/rust/pull/58370/
+[58406]: https://github.com/rust-lang/rust/pull/58406/
+[58421]: https://github.com/rust-lang/rust/pull/58421/
+[58166]: https://github.com/rust-lang/rust/pull/58166/
+[58044]: https://github.com/rust-lang/rust/pull/58044/
+[58057]: https://github.com/rust-lang/rust/pull/58057/
+[58059]: https://github.com/rust-lang/rust/pull/58059/
+[57809]: https://github.com/rust-lang/rust/pull/57809/
+[57873]: https://github.com/rust-lang/rust/pull/57873/
+[57604]: https://github.com/rust-lang/rust/pull/57604/
+[57367]: https://github.com/rust-lang/rust/pull/57367/
+[57407]: https://github.com/rust-lang/rust/pull/57407/
+[57425]: https://github.com/rust-lang/rust/pull/57425/
+[57106]: https://github.com/rust-lang/rust/pull/57106/
+[56470]: https://github.com/rust-lang/rust/pull/56470/
+[cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
+[`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
+[`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
+[`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
+[`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
+[`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
+[`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
+[`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
+[`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
+[`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
+[`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
+[`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
+[`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
+[`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
+[`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
+[`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
+[`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
+[`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
+[`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
+[`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
+[`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
+[`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
+[`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
+[`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
+[`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
+[`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
+[`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
+[`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
+[`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
+[`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
+[`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
+
+
+Version 1.33.0 (2019-02-28)
+==========================
+
+Language
+--------
+- [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
+ `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
+- [Integer patterns such as in a match expression can now be exhaustive.][56362]
+ E.g. You can have match statement on a `u8` that covers `0..=255` and
+ you would no longer be required to have a `_ => unreachable!()` case.
+- [You can now have multiple patterns in `if let` and `while let`
+ expressions.][57532] You can do this with the same syntax as a `match`
+ expression. E.g.
+ ```rust
+ enum Creature {
+ Crab(String),
+ Lobster(String),
+ Person(String),
+ }
+
+ fn main() {
+ let state = Creature::Crab("Ferris");
+
+ if let Creature::Crab(name) | Creature::Person(name) = state {
+ println!("This creature's name is: {}", name);
+ }
+ }
+ ```
+- [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
+ this feature will by default produce a warning as this behaviour can be
+ unintuitive. E.g. `if let _ = 5 {}`
+- [You can now use `let` bindings, assignments, expression statements,
+ and irrefutable pattern destructuring in const functions.][57175]
+- [You can now call unsafe const functions.][57067] E.g.
+ ```rust
+ const unsafe fn foo() -> i32 { 5 }
+ const fn bar() -> i32 {
+ unsafe { foo() }
+ }
+ ```
+- [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
+ E.g. `#[cfg_attr(all(), must_use, optimize)]`
+- [You can now specify a specific alignment with the `#[repr(packed)]`
+ attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
+ with an alignment of 2 bytes and a size of 6 bytes.
+- [You can now import an item from a module as an `_`.][56303] This allows you to
+ import a trait's impls, and not have the name in the namespace. E.g.
+ ```rust
+ use std::io::Read as _;
+
+ // Allowed as there is only one `Read` in the module.
+ pub trait Read {}
+ ```
+- [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
+
+Compiler
+--------
+- [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
+ command line argument.][56351]
+- [The minimum required LLVM version has been bumped to 6.0.][56642]
+- [Added support for the PowerPC64 architecture on FreeBSD.][57615]
+- [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
+ tier 2 support.][57130] Visit the [platform support][platform-support] page for
+ information on Rust's platform support.
+- [Added support for the `thumbv7neon-linux-androideabi` and
+ `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
+- [Added support for the `x86_64-unknown-uefi` target.][56769]
+
+Libraries
+---------
+- [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
+ functions for all numeric types.][57566]
+- [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
+ are now `const` functions for all numeric types.][57105]
+- [The methods `is_positive` and `is_negative` are now `const` functions for
+ all signed numeric types.][57105]
+- [The `get` method for all `NonZero` types is now `const`.][57167]
+- [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
+ `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
+ numeric types.][57234]
+- [`Ipv4Addr::new` is now a `const` function][57234]
+
+Stabilized APIs
+---------------
+- [`unix::FileExt::read_exact_at`]
+- [`unix::FileExt::write_all_at`]
+- [`Option::transpose`]
+- [`Result::transpose`]
+- [`convert::identity`]
+- [`pin::Pin`]
+- [`marker::Unpin`]
+- [`marker::PhantomPinned`]
+- [`Vec::resize_with`]
+- [`VecDeque::resize_with`]
+- [`Duration::as_millis`]
+- [`Duration::as_micros`]
+- [`Duration::as_nanos`]
+
+
+Cargo
+-----
+- [You can now publish crates that require a feature flag to compile with
+ `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
+- [Cargo should now rebuild a crate if a file was modified during the initial
+ build.][cargo/6484]
+
+Compatibility Notes
+-------------------
+- The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
+ are now deprecated in the standard library, and their usage will now produce a warning.
+ Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
+ methods instead.
+- The `Error::cause` method has been deprecated in favor of `Error::source` which supports
+ downcasting.
+- [Libtest no longer creates a new thread for each test when
+ `--test-threads=1`. It also runs the tests in deterministic order][56243]
+
+[56243]: https://github.com/rust-lang/rust/pull/56243
+[56303]: https://github.com/rust-lang/rust/pull/56303/
+[56351]: https://github.com/rust-lang/rust/pull/56351/
+[56362]: https://github.com/rust-lang/rust/pull/56362
+[56642]: https://github.com/rust-lang/rust/pull/56642/
+[56769]: https://github.com/rust-lang/rust/pull/56769/
+[56805]: https://github.com/rust-lang/rust/pull/56805
+[56947]: https://github.com/rust-lang/rust/pull/56947/
+[57049]: https://github.com/rust-lang/rust/pull/57049/
+[57067]: https://github.com/rust-lang/rust/pull/57067/
+[57105]: https://github.com/rust-lang/rust/pull/57105
+[57130]: https://github.com/rust-lang/rust/pull/57130/
+[57167]: https://github.com/rust-lang/rust/pull/57167/
+[57175]: https://github.com/rust-lang/rust/pull/57175/
+[57234]: https://github.com/rust-lang/rust/pull/57234/
+[57332]: https://github.com/rust-lang/rust/pull/57332/
+[57465]: https://github.com/rust-lang/rust/pull/57465/
+[57532]: https://github.com/rust-lang/rust/pull/57532/
+[57535]: https://github.com/rust-lang/rust/pull/57535/
+[57566]: https://github.com/rust-lang/rust/pull/57566/
+[57615]: https://github.com/rust-lang/rust/pull/57615/
+[cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
+[cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
+[`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
+[`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
+[`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
+[`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
+[`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
+[`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
+[`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
+[`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
+[`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
+[`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
+[`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
+[`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
+[`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
+[platform-support]: https://forge.rust-lang.org/platform-support.html
+
+Version 1.32.0 (2019-01-17)
+==========================
+
+Language
+--------
+#### 2018 edition
+- [You can now use the `?` operator in macro definitions.][56245] The `?`
+ operator allows you to specify zero or one repetitions similar to the `*` and
+ `+` operators.
+- [Module paths with no leading keyword like `super`, `self`, or `crate`, will
+ now always resolve to the item (`enum`, `struct`, etc.) available in the
+ module if present, before resolving to a external crate or an item the prelude.][56759]
+ E.g.
+ ```rust
+ enum Color { Red, Green, Blue }
+
+ use Color::*;
+ ```
+
+#### All editions
+- [You can now match against `PhantomData<T>` types.][55837]
+- [You can now match against literals in macros with the `literal`
+ specifier.][56072] This will match against a literal of any type.
+ E.g. `1`, `'A'`, `"Hello World"`
+- [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
+ ```rust
+ struct Point(i32, i32);
+
+ impl Point {
+ pub fn new(x: i32, y: i32) -> Self {
+ Self(x, y)
+ }
+
+ pub fn is_origin(&self) -> bool {
+ match self {
+ Self(0, 0) => true,
+ _ => false,
+ }
+ }
+ }
+ ```
+- [Self can also now be used in type definitions.][56366] E.g.
+ ```rust
+ enum List<T>
+ where
+ Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
+ {
+ Nil,
+ Cons(T, Box<Self>) // likewise here
+ }
+ ```
+- [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
+ a `impl Trait` or `dyn Trait` is returned and unused in the program.
+
+Compiler
+--------
+- [The default allocator has changed from jemalloc to the default allocator on
+ your system.][55238] The compiler itself on Linux & macOS will still use
+ jemalloc, but programs compiled with it will use the system allocator.
+- [Added the `aarch64-pc-windows-msvc` target.][55702]
+
+Libraries
+---------
+- [`PathBuf` now implements `FromStr`.][55148]
+- [`Box<[T]>` now implements `FromIterator<T>`.][55843]
+- [The `dbg!` macro has been stabilized.][56395] This macro enables you to
+ easily debug expressions in your rust program. E.g.
+ ```rust
+ let a = 2;
+ let b = dbg!(a * 2) + 1;
+ // ^-- prints: [src/main.rs:4] a * 2 = 4
+ assert_eq!(b, 5);
+ ```
+
+The following APIs are now `const` functions and can be used in a
+`const` context.
+
+- [`Cell::as_ptr`]
+- [`UnsafeCell::get`]
+- [`char::is_ascii`]
+- [`iter::empty`]
+- [`ManuallyDrop::new`]
+- [`ManuallyDrop::into_inner`]
+- [`RangeInclusive::start`]
+- [`RangeInclusive::end`]
+- [`NonNull::as_ptr`]
+- [`slice::as_ptr`]
+- [`str::as_ptr`]
+- [`Duration::as_secs`]
+- [`Duration::subsec_millis`]
+- [`Duration::subsec_micros`]
+- [`Duration::subsec_nanos`]
+- [`CStr::as_ptr`]
+- [`Ipv4Addr::is_unspecified`]
+- [`Ipv6Addr::new`]
+- [`Ipv6Addr::octets`]
+
+Stabilized APIs
+---------------
+- [`i8::to_be_bytes`]
+- [`i8::to_le_bytes`]
+- [`i8::to_ne_bytes`]
+- [`i8::from_be_bytes`]
+- [`i8::from_le_bytes`]
+- [`i8::from_ne_bytes`]
+- [`i16::to_be_bytes`]
+- [`i16::to_le_bytes`]
+- [`i16::to_ne_bytes`]
+- [`i16::from_be_bytes`]
+- [`i16::from_le_bytes`]
+- [`i16::from_ne_bytes`]
+- [`i32::to_be_bytes`]
+- [`i32::to_le_bytes`]
+- [`i32::to_ne_bytes`]
+- [`i32::from_be_bytes`]
+- [`i32::from_le_bytes`]
+- [`i32::from_ne_bytes`]
+- [`i64::to_be_bytes`]
+- [`i64::to_le_bytes`]
+- [`i64::to_ne_bytes`]
+- [`i64::from_be_bytes`]
+- [`i64::from_le_bytes`]
+- [`i64::from_ne_bytes`]
+- [`i128::to_be_bytes`]
+- [`i128::to_le_bytes`]
+- [`i128::to_ne_bytes`]
+- [`i128::from_be_bytes`]
+- [`i128::from_le_bytes`]
+- [`i128::from_ne_bytes`]
+- [`isize::to_be_bytes`]
+- [`isize::to_le_bytes`]
+- [`isize::to_ne_bytes`]
+- [`isize::from_be_bytes`]
+- [`isize::from_le_bytes`]
+- [`isize::from_ne_bytes`]
+- [`u8::to_be_bytes`]
+- [`u8::to_le_bytes`]
+- [`u8::to_ne_bytes`]
+- [`u8::from_be_bytes`]
+- [`u8::from_le_bytes`]
+- [`u8::from_ne_bytes`]
+- [`u16::to_be_bytes`]
+- [`u16::to_le_bytes`]
+- [`u16::to_ne_bytes`]
+- [`u16::from_be_bytes`]
+- [`u16::from_le_bytes`]
+- [`u16::from_ne_bytes`]
+- [`u32::to_be_bytes`]
+- [`u32::to_le_bytes`]
+- [`u32::to_ne_bytes`]
+- [`u32::from_be_bytes`]
+- [`u32::from_le_bytes`]
+- [`u32::from_ne_bytes`]
+- [`u64::to_be_bytes`]
+- [`u64::to_le_bytes`]
+- [`u64::to_ne_bytes`]
+- [`u64::from_be_bytes`]
+- [`u64::from_le_bytes`]
+- [`u64::from_ne_bytes`]
+- [`u128::to_be_bytes`]
+- [`u128::to_le_bytes`]
+- [`u128::to_ne_bytes`]
+- [`u128::from_be_bytes`]
+- [`u128::from_le_bytes`]
+- [`u128::from_ne_bytes`]
+- [`usize::to_be_bytes`]
+- [`usize::to_le_bytes`]
+- [`usize::to_ne_bytes`]
+- [`usize::from_be_bytes`]
+- [`usize::from_le_bytes`]
+- [`usize::from_ne_bytes`]
+
+Cargo
+-----
+- [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
+- [Usernames are now allowed in alt registry URLs.][cargo/6242]
+
+Misc
+----
+- [`libproc_macro` has been added to the `rust-src` distribution.][55280]
+
+Compatibility Notes
+-------------------
+- [The argument types for AVX's
+ `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
+ been changed from `*const` to `*mut` as the previous implementation
+ was unsound.
+
+
+[55148]: https://github.com/rust-lang/rust/pull/55148/
+[55238]: https://github.com/rust-lang/rust/pull/55238/
+[55280]: https://github.com/rust-lang/rust/pull/55280/
+[55610]: https://github.com/rust-lang/rust/pull/55610/
+[55663]: https://github.com/rust-lang/rust/pull/55663/
+[55702]: https://github.com/rust-lang/rust/pull/55702/
+[55837]: https://github.com/rust-lang/rust/pull/55837/
+[55843]: https://github.com/rust-lang/rust/pull/55843/
+[56072]: https://github.com/rust-lang/rust/pull/56072/
+[56245]: https://github.com/rust-lang/rust/pull/56245/
+[56365]: https://github.com/rust-lang/rust/pull/56365/
+[56366]: https://github.com/rust-lang/rust/pull/56366/
+[56395]: https://github.com/rust-lang/rust/pull/56395/
+[56759]: https://github.com/rust-lang/rust/pull/56759/
+[cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
+[cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
+[`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
+[`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
+[`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
+[`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
+[`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
+[`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
+[`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
+[`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
+[`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
+[`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
+[`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
+[`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
+[`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
+[`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
+[`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
+[`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
+[`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
+[`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
+[`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
+[`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
+[`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
+[`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
+[`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
+[`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
+[`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
+[`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
+[`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
+[`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
+[`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
+[`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
+[`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
+[`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
+[`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
+[`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
+[`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
+[`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
+[`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
+[`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
+[`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
+[`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
+[`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
+[`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
+[`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
+[`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
+[`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
+[`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
+[`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
+[`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
+[`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
+[`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
+[`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
+[`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
+[`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
+[`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
+[`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
+[`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
+[`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
+[`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
+[`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
+[`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
+[`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
+[`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
+[`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
+[`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
+[`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
+[`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
+[`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
+[`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
+[`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
+[`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
+[`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
+[`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
+[`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
+[`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
+[`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
+[`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
+[`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
+[`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
+[`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
+[`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
+[`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
+[`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
+[`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
+[`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
+[`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
+[`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
+[`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
+[`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
+[`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
+[`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
+[`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
+
+
+Version 1.31.1 (2018-12-20)
+===========================
+
+- [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
+- [Fix broken go-to-definition in RLS][rls/1171]
+- [Fix infinite loop on hover in RLS][rls/1170]
+
+[56562]: https://github.com/rust-lang/rust/pull/56562
+[rls/1171]: https://github.com/rust-lang/rls/issues/1171
+[rls/1170]: https://github.com/rust-lang/rls/pull/1170
+
+Version 1.31.0 (2018-12-06)
+==========================
+
+Language
+--------
+- 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
+- [New lifetime elision rules now allow for eliding lifetimes in functions and
+ impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
+ `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
+ in structs.
+- [You can now define and use `const` functions.][54835] These are currently
+ a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
+ [language reference][const-reference] for what exactly is available.
+- [You can now use tool lints, which allow you to scope lints from external
+ tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
+- [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
+ a crate, not just in exported functions.][54451]
+- [You can now use parentheses in pattern matches.][54497]
+
+Compiler
+--------
+- [Updated musl to 1.1.20][54430]
+
+Libraries
+---------
+- [You can now convert `num::NonZero*` types to their raw equivalents using the
+ `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
+- [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
+ into `Option<&mut T>` using the `From` trait.][53218]
+- [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
+
+
+Stabilized APIs
+---------------
+- [`slice::align_to`]
+- [`slice::align_to_mut`]
+- [`slice::chunks_exact`]
+- [`slice::chunks_exact_mut`]
+- [`slice::rchunks`]
+- [`slice::rchunks_mut`]
+- [`slice::rchunks_exact`]
+- [`slice::rchunks_exact_mut`]
+- [`Option::replace`]
+
+Cargo
+-----
+- [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
+- [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
+ on [how to use the `package` key in your dependencies.][cargo-rename-reference]
+
+[52813]: https://github.com/rust-lang/rust/pull/52813/
+[53218]: https://github.com/rust-lang/rust/pull/53218/
+[54057]: https://github.com/rust-lang/rust/pull/54057/
+[54240]: https://github.com/rust-lang/rust/pull/54240/
+[54430]: https://github.com/rust-lang/rust/pull/54430/
+[54451]: https://github.com/rust-lang/rust/pull/54451/
+[54497]: https://github.com/rust-lang/rust/pull/54497/
+[54778]: https://github.com/rust-lang/rust/pull/54778/
+[54835]: https://github.com/rust-lang/rust/pull/54835/
+[54870]: https://github.com/rust-lang/rust/pull/54870/
+[RFC-911]: https://github.com/rust-lang/rfcs/pull/911
+[`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
+[`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
+[`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
+[`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
+[`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
+[`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
+[`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
+[`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
+[`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
+[cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
+[cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
+[cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
+[const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
+
+Version 1.30.1 (2018-11-08)
+===========================
+
+- [Fixed overflow ICE in rustdoc][54199]
+- [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
+
+[54199]: https://github.com/rust-lang/rust/pull/54199
+[cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
+
+Version 1.30.0 (2018-10-25)
+==========================
+
+Language
+--------
+- [Procedural macros are now available.][52081] These kinds of macros allow for
+ more powerful code generation. There is a [new chapter available][proc-macros]
+ in the Rust Programming Language book that goes further in depth.
+- [You can now use keywords as identifiers using the raw identifiers
+ syntax (`r#`),][53236] e.g. `let r#for = true;`
+- [Using anonymous parameters in traits is now deprecated with a warning and
+ will be a hard error in the 2018 edition.][53272]
+- [You can now use `crate` in paths.][54404] This allows you to refer to the
+ crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
+- [Using a external crate no longer requires being prefixed with `::`.][54404]
+ Previously, using a external crate in a module without a use statement
+ required `let json = ::serde_json::from_str(foo);` but can now be written
+ as `let json = serde_json::from_str(foo);`.
+- [You can now apply the `#[used]` attribute to static items to prevent the
+ compiler from optimising them away, even if they appear to be unused,][51363]
+ e.g. `#[used] static FOO: u32 = 1;`
+- [You can now import and reexport macros from other crates with the `use`
+ syntax.][50911] Macros exported with `#[macro_export]` are now placed into
+ the root module of the crate. If your macro relies on calling other local
+ macros, it is recommended to export with the
+ `#[macro_export(local_inner_macros)]` attribute so users won't have to import
+ those macros.
+- [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
+ using the `vis` specifier.][53370]
+- [Non-macro attributes now allow all forms of literals, not just
+ strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
+ write `#[attr(true)]`.
+- [You can now specify a function to handle a panic in the Rust runtime with the
+ `#[panic_handler]` attribute.][51366]
+
+Compiler
+--------
+- [Added the `riscv32imc-unknown-none-elf` target.][53822]
+- [Added the `aarch64-unknown-netbsd` target][53165]
+- [Upgraded to LLVM 8.][53611]
+
+Libraries
+---------
+- [`ManuallyDrop` now allows the inner type to be unsized.][53033]
+
+Stabilized APIs
+---------------
+- [`Ipv4Addr::BROADCAST`]
+- [`Ipv4Addr::LOCALHOST`]
+- [`Ipv4Addr::UNSPECIFIED`]
+- [`Ipv6Addr::LOCALHOST`]
+- [`Ipv6Addr::UNSPECIFIED`]
+- [`Iterator::find_map`]
+
+ The following methods are replacement methods for `trim_left`, `trim_right`,
+ `trim_left_matches`, and `trim_right_matches`, which will be deprecated
+ in 1.33.0:
+- [`str::trim_end_matches`]
+- [`str::trim_end`]
+- [`str::trim_start_matches`]
+- [`str::trim_start`]
+
+Cargo
+----
+- [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
+- [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
+ equivalent to calling `rustdoc --error-format=json`.
+- [Cargo will now provide a progress bar for builds.][cargo/5995]
+
+Misc
+----
+- [`rustdoc` allows you to specify what edition to treat your code as with the
+ `--edition` option.][54057]
+- [`rustdoc` now has the `--color` (specify whether to output color) and
+ `--error-format` (specify error format, e.g. `json`) options.][53003]
+- [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
+ debug symbols.][53774]
+- [Attributes from Rust tools such as `rustfmt` or `clippy` are now
+ available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
+
+[50911]: https://github.com/rust-lang/rust/pull/50911/
+[51363]: https://github.com/rust-lang/rust/pull/51363/
+[51366]: https://github.com/rust-lang/rust/pull/51366/
+[52081]: https://github.com/rust-lang/rust/pull/52081/
+[53003]: https://github.com/rust-lang/rust/pull/53003/
+[53033]: https://github.com/rust-lang/rust/pull/53033/
+[53044]: https://github.com/rust-lang/rust/pull/53044/
+[53165]: https://github.com/rust-lang/rust/pull/53165/
+[53611]: https://github.com/rust-lang/rust/pull/53611/
+[53236]: https://github.com/rust-lang/rust/pull/53236/
+[53272]: https://github.com/rust-lang/rust/pull/53272/
+[53370]: https://github.com/rust-lang/rust/pull/53370/
+[53459]: https://github.com/rust-lang/rust/pull/53459/
+[53774]: https://github.com/rust-lang/rust/pull/53774/
+[53822]: https://github.com/rust-lang/rust/pull/53822/
+[54057]: https://github.com/rust-lang/rust/pull/54057/
+[54404]: https://github.com/rust-lang/rust/pull/54404/
+[cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
+[cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
+[cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
+[proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
+
+[`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
+[`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
+[`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
+[`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
+[`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
+[`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
+[`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
+[`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
+[`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
+[`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
+
+
+Version 1.29.2 (2018-10-11)
+===========================
+
+- [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
+- The `rls-preview` component on the windows-gnu targets has been restored.
+
+[54639]: https://github.com/rust-lang/rust/pull/54639
+
+
+Version 1.29.1 (2018-09-25)
+===========================
+
+Security Notes
+--------------
+
+- The standard library's `str::repeat` function contained an out of bounds write
+ caused by an integer overflow. This has been fixed by deterministically
+ panicking when an overflow happens.
+
+ Thank you to Scott McMurray for responsibly disclosing this vulnerability to
+ us.
+
+
Version 1.29.0 (2018-09-13)
==========================
- [Bumped minimum LLVM version to 5.0.][51899]
- [Added `powerpc64le-unknown-linux-musl` target.][51619]
- [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
+- [Upgraded to LLVM 7.][51966]
Libraries
---------
-- [`Once::call_once` now no longer requires `Once` to be `'static`.][52239]
+- [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
- [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
- [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
- [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
Cargo
-----
-- [Cargo can silently fix some bad lockfiles ][cargo/5831] You can use
- `--locked` to disable this behaviour.
+- [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
+ `--locked` to disable this behavior.
- [`cargo-install` will now allow you to cross compile an install
- using `--target`][cargo/5614]
+ using `--target`.][cargo/5614]
- [Added the `cargo-fix` subcommand to automatically move project code from
2015 edition to 2018.][cargo/5723]
+- [`cargo doc` can now optionally document private types using the
+ `--document-private-items` flag.][cargo/5543]
Misc
----
the specified level to that level.][52354] For example `--cap-lints warn`
will demote `deny` and `forbid` lints to `warn`.
- [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
- fails, and `101` if there is a panic.][52197]
+ fails and `101` if there is a panic.][52197]
- [A preview of clippy has been made available through rustup.][51122]
- You can install the preview with `rustup component add clippy-preview`
+ You can install the preview with `rustup component add clippy-preview`.
Compatibility Notes
-------------------
- [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
Use `str::get_unchecked(begin..end)` instead.
-- [`std::env::home_dir` is now deprecated for its unintuitive behaviour.][51656]
+- [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
Consider using the `home_dir` function from
https://crates.io/crates/dirs instead.
- [`rustc` will no longer silently ignore invalid data in target spec.][52330]
+- [`cfg` attributes and `--cfg` command line flags are now more
+ strictly validated.][53893]
+[53893]: https://github.com/rust-lang/rust/pull/53893/
[52861]: https://github.com/rust-lang/rust/pull/52861/
+[51966]: https://github.com/rust-lang/rust/pull/51966/
[52656]: https://github.com/rust-lang/rust/pull/52656/
[52239]: https://github.com/rust-lang/rust/pull/52239/
[52330]: https://github.com/rust-lang/rust/pull/52330/
[52354]: https://github.com/rust-lang/rust/pull/52354/
[52402]: https://github.com/rust-lang/rust/pull/52402/
-[52103]: https://github.com/rust-lang/rust/pull/52103/
[52197]: https://github.com/rust-lang/rust/pull/52197/
[51807]: https://github.com/rust-lang/rust/pull/51807/
[51899]: https://github.com/rust-lang/rust/pull/51899/
[51912]: https://github.com/rust-lang/rust/pull/51912/
-[51511]: https://github.com/rust-lang/rust/pull/51511/
[51619]: https://github.com/rust-lang/rust/pull/51619/
[51656]: https://github.com/rust-lang/rust/pull/51656/
[51178]: https://github.com/rust-lang/rust/pull/51178/
[51122]: https://github.com/rust-lang/rust/pull/51122
[50494]: https://github.com/rust-lang/rust/pull/50494/
+[cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
[cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
[cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
[cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
[50855]: https://github.com/rust-lang/rust/pull/50855/
[51050]: https://github.com/rust-lang/rust/pull/51050/
[51196]: https://github.com/rust-lang/rust/pull/51196/
-[51200]: https://github.com/rust-lang/rust/pull/51200/
[51241]: https://github.com/rust-lang/rust/pull/51241/
[51276]: https://github.com/rust-lang/rust/pull/51276/
[51298]: https://github.com/rust-lang/rust/pull/51298/
given machine. This release fixes that vulnerability; you can read
more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
- Thank you to Red Hat for responsibily disclosing this vulnerability to us.
+ Thank you to Red Hat for responsibly disclosing this vulnerability to us.
Compatibility Notes
-------------------
be used as an identifier.
- [The dyn syntax is now available.][49968] This syntax is equivalent to the
bare `Trait` syntax, and should make it clearer when being used in tandem with
- `impl Trait`. Since it is equivalent to the following syntax:
+ `impl Trait` because it is equivalent to the following syntax:
`&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
`Box<Trait> == Box<dyn Trait>`.
- [Attributes on generic parameters such as types and lifetimes are
Compiler
--------
-- [Added the `armv5te-unknown-linux-musl` target.][50423]
+- [Added the `armv5te-unknown-linux-musleabi` target.][50423]
Libraries
---------
a different directory than `target` for placing compilation artifacts.
- [Cargo will be adding automatic target inference for binaries, benchmarks,
examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
- specific targets e.g. using `[[bin]]` and have other binaries in locations
+ specific targets, e.g. using `[[bin]]`, and have other binaries in locations
where cargo would infer a binary, Cargo will produce a warning. You can
- disable this feature ahead of time by setting any of the following `autobins`,
- `autobenches`, `autoexamples`, `autotests` to false.
+ disable this feature ahead of time by setting any of the following to false:
+ `autobins`, `autobenches`, `autoexamples`, `autotests`.
- [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
compile, `"".is_empty()` will still compile.
- [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
- will only print the inner type.][48553] e.g.
- `print!("{:?}", AtomicBool::new(true))` will print `true`
+ will only print the inner type.][48553] E.g.
+ `print!("{:?}", AtomicBool::new(true))` will print `true`,
not `AtomicBool(true)`.
- [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
could enter higher numbers but they were not supported by LLVM. Up to 512MB
alignment should cover all use cases.
+- The `.description()` method on the `std::error::Error` trait
+ [has been soft-deprecated][50163]. It is no longer required to implement it.
[48553]: https://github.com/rust-lang/rust/pull/48553/
[48851]: https://github.com/rust-lang/rust/pull/48851/
[49664]: https://github.com/rust-lang/rust/pull/49664/
[49699]: https://github.com/rust-lang/rust/pull/49699/
[49707]: https://github.com/rust-lang/rust/pull/49707/
-[49719]: https://github.com/rust-lang/rust/pull/49719/
[49896]: https://github.com/rust-lang/rust/pull/49896/
[49968]: https://github.com/rust-lang/rust/pull/49968/
+[50163]: https://github.com/rust-lang/rust/pull/50163
[50177]: https://github.com/rust-lang/rust/pull/50177/
[50378]: https://github.com/rust-lang/rust/pull/50378/
-[50398]: https://github.com/rust-lang/rust/pull/50398/
[50423]: https://github.com/rust-lang/rust/pull/50423/
-[cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
[cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
[cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
[cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
Compatibility Notes
-------------------
-- [The borrow checker was fixed to avoid unsoundness when using match ergonomics][51117]
+- [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
[51117]: https://github.com/rust-lang/rust/issues/51117
Tools
-----
-- [RLS now works on Windows][50646]
-- [Rustfmt stopped badly formatting text in some cases][rustfmt/2695]
+- [RLS now works on Windows.][50646]
+- [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
Compatibility Notes
--------
- [`fn main() -> impl Trait` no longer works for non-Termination
- trait][50656]
+ trait.][50656]
This reverts an accidental stabilization.
-- [`NaN > NaN` no longer returns true in const-fn contexts][50812]
-- [Prohibit using turbofish for `impl Trait` in method arguments][50950]
+- [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
+- [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
[50646]: https://github.com/rust-lang/rust/issues/50646
[50656]: https://github.com/rust-lang/rust/pull/50656
- [Closures now implement `Copy` and/or `Clone` if all captured variables
implement either or both traits.][49299]
- [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
-- [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere where a
+- [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
lifetime can be elided.][49458]
- [`impl Trait` is now stable allowing you to have abstract types in returns
- or in function parameters.][49255] e.g. `fn foo() -> impl Iterator<Item=u8>` or
+ or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
`fn open(path: impl AsRef<Path>)`.
- [Pattern matching will now automatically apply dereferences.][49394]
- [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
- [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
- [A lot of operations are now available in a const context.][46882] E.g. You
can now index into constant arrays, reference and dereference into constants,
- and use Tuple struct constructors.
-- [Fixed entry slice patterns are now stable.][48516] e.g.
+ and use tuple struct constructors.
+- [Fixed entry slice patterns are now stable.][48516] E.g.
```rust
let points = [1, 2, 3, 4];
match points {
[47813]: https://github.com/rust-lang/rust/pull/47813
[48056]: https://github.com/rust-lang/rust/pull/48056
[48125]: https://github.com/rust-lang/rust/pull/48125
-[48166]: https://github.com/rust-lang/rust/pull/48166
[48235]: https://github.com/rust-lang/rust/pull/48235
[48274]: https://github.com/rust-lang/rust/pull/48274
[48281]: https://github.com/rust-lang/rust/pull/48281
[48978]: https://github.com/rust-lang/rust/pull/48978
[49101]: https://github.com/rust-lang/rust/pull/49101
[49109]: https://github.com/rust-lang/rust/pull/49109
-[49121]: https://github.com/rust-lang/rust/pull/49121
[49162]: https://github.com/rust-lang/rust/pull/49162
-[49184]: https://github.com/rust-lang/rust/pull/49184
-[49234]: https://github.com/rust-lang/rust/pull/49234
[49255]: https://github.com/rust-lang/rust/pull/49255
[49299]: https://github.com/rust-lang/rust/pull/49299
[49305]: https://github.com/rust-lang/rust/pull/49305
Cargo
-----
-- [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
+- [`cargo new` no longer removes `rust` or `rs` prefixes/suffixes.][cargo/5013]
- [`cargo new` now defaults to creating a binary crate, instead of a
library crate.][cargo/5029]
[44884]: https://github.com/rust-lang/rust/pull/44884
[45198]: https://github.com/rust-lang/rust/pull/45198
[45506]: https://github.com/rust-lang/rust/pull/45506
-[45904]: https://github.com/rust-lang/rust/pull/45904
[45990]: https://github.com/rust-lang/rust/pull/45990
[46012]: https://github.com/rust-lang/rust/pull/46012
[46077]: https://github.com/rust-lang/rust/pull/46077
[46671]: https://github.com/rust-lang/rust/pull/46671
[46713]: https://github.com/rust-lang/rust/pull/46713
[46735]: https://github.com/rust-lang/rust/pull/46735
-[46749]: https://github.com/rust-lang/rust/pull/46749
[46760]: https://github.com/rust-lang/rust/pull/46760
[46798]: https://github.com/rust-lang/rust/pull/46798
[46828]: https://github.com/rust-lang/rust/pull/46828
Compiler
--------
- [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
- undefined behaviour.][45920]
+ undefined behavior.][45920]
- [rustc now suggests renaming import if names clash.][45660]
- [Display errors/warnings correctly when there are zero-width or
wide characters.][45711]
[42526]: https://github.com/rust-lang/rust/pull/42526
-[43017]: https://github.com/rust-lang/rust/pull/43017
[43716]: https://github.com/rust-lang/rust/pull/43716
[43949]: https://github.com/rust-lang/rust/pull/43949
[44015]: https://github.com/rust-lang/rust/pull/44015
- [Upgrade to Unicode 10.0.0][42999]
- [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
- [Skip the main thread's manual stack guard on Linux][43072]
-- [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
+- [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
- [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
previously 2^15.
- [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
- [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
failure.][cargo/4248]
- [Changed the convention around which file is the crate root.][cargo/4259]
-- [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
- instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
Compatibility Notes
-------------------
[cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
[cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
[cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
-[cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
[`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
[`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
[`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
----
- [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
-- [Added rust-windbg script for better debugging on Windows][39983]
- [Rust now uses the official cross compiler for NetBSD][40612]
- [rustdoc now accepts `#` at the start of files][40828]
- [Fixed jemalloc support for musl][41168]
[38165]: https://github.com/rust-lang/rust/pull/38165
[39799]: https://github.com/rust-lang/rust/pull/39799
[39891]: https://github.com/rust-lang/rust/pull/39891
-[39983]: https://github.com/rust-lang/rust/pull/39983
[40043]: https://github.com/rust-lang/rust/pull/40043
[40241]: https://github.com/rust-lang/rust/pull/40241
[40338]: https://github.com/rust-lang/rust/pull/40338
[cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
[cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
[cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
-[mdbook]: https://crates.io/crates/mdbook
[ubook]: https://doc.rust-lang.org/unstable-book/
* [Ctrl-Z returns from `Stdin.read()` when reading from the console on
Windows][38274]
* [std: Fix partial writes in `LineWriter`][38062]
-* [std: Clamp max read/write sizes on Unix][38062]
+* [std: Clamp max read/write sizes on Unix][38622]
* [Use more specific panic message for `&str` slicing errors][38066]
* [`TcpListener::set_only_v6` is deprecated][38304]. This
functionality cannot be achieved in std currently.
[38006]: https://github.com/rust-lang/rust/pull/38006
[38051]: https://github.com/rust-lang/rust/pull/38051
[38062]: https://github.com/rust-lang/rust/pull/38062
-[38062]: https://github.com/rust-lang/rust/pull/38622
+[38622]: https://github.com/rust-lang/rust/pull/38622
[38066]: https://github.com/rust-lang/rust/pull/38066
[38069]: https://github.com/rust-lang/rust/pull/38069
[38131]: https://github.com/rust-lang/rust/pull/38131
[38274]: https://github.com/rust-lang/rust/pull/38274
[38304]: https://github.com/rust-lang/rust/pull/38304
[38313]: https://github.com/rust-lang/rust/pull/38313
-[38314]: https://github.com/rust-lang/rust/pull/38314
[38327]: https://github.com/rust-lang/rust/pull/38327
[38401]: https://github.com/rust-lang/rust/pull/38401
[38413]: https://github.com/rust-lang/rust/pull/38413
[39379]: https://github.com/rust-lang/rust/pull/39379
[41105]: https://github.com/rust-lang/rust/issues/41105
[`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
-[`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
+[`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset-1
[`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
[`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
[`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
[cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
[cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
[cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
-[RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
Version 1.15.1 (2017-02-09)
[38192]: https://github.com/rust-lang/rust/pull/38192
[38279]: https://github.com/rust-lang/rust/pull/38279
[38835]: https://github.com/rust-lang/rust/pull/38835
-[RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
[RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
[RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
[RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
[1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
[36430]: https://github.com/rust-lang/rust/pull/36430
[36595]: https://github.com/rust-lang/rust/pull/36595
-[36595]: https://github.com/rust-lang/rust/pull/36595
[36692]: https://github.com/rust-lang/rust/pull/36692
[36767]: https://github.com/rust-lang/rust/pull/36767
[36794]: https://github.com/rust-lang/rust/pull/36794
[34623]: https://github.com/rust-lang/rust/pull/34623
[34923]: https://github.com/rust-lang/rust/pull/34923
[34942]: https://github.com/rust-lang/rust/pull/34942
-[34982]: https://github.com/rust-lang/rust/pull/34982
[35021]: https://github.com/rust-lang/rust/pull/35021
[35048]: https://github.com/rust-lang/rust/pull/35048
[35074]: https://github.com/rust-lang/rust/pull/35074
[36586]: https://github.com/rust-lang/rust/pull/36586
[36592]: https://github.com/rust-lang/rust/pull/36592
[36631]: https://github.com/rust-lang/rust/pull/36631
-[36639]: https://github.com/rust-lang/rust/pull/36639
[36721]: https://github.com/rust-lang/rust/pull/36721
[36727]: https://github.com/rust-lang/rust/pull/36727
[36730]: https://github.com/rust-lang/rust/pull/36730
[cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
[cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
[cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
-[rustup]: https://www.rustup.rs
[`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
[`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
[`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
Language
--------
-* [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
* [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
* [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
* [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
* [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
(in libcore - previously stabilized in libstd)
* [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
-* [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
+* [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.product)
* [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
* [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
Language
--------
-* [Allow `concat_idents!` in type positions as well as in expression
- positions](https://github.com/rust-lang/rust/pull/33735).
* [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
[RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
* [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
---------------
* [`std::panic`]
-* [`std::panic::catch_unwind`][] (renamed from `recover`)
-* [`std::panic::resume_unwind`][] (renamed from `propagate`)
-* [`std::panic::AssertUnwindSafe`][] (renamed from `AssertRecoverSafe`)
-* [`std::panic::UnwindSafe`][] (renamed from `RecoverSafe`)
+* [`std::panic::catch_unwind`] (renamed from `recover`)
+* [`std::panic::resume_unwind`] (renamed from `propagate`)
+* [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
+* [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
* [`str::is_char_boundary`]
* [`<*const T>::as_ref`]
* [`<*mut T>::as_ref`]
---------
* Stabilized APIs:
- * [`str::encode_utf16`][] (renamed from `utf16_units`)
- * [`str::EncodeUtf16`][] (renamed from `Utf16Units`)
+ * [`str::encode_utf16`] (renamed from `utf16_units`)
+ * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
* [`Ref::map`]
* [`RefMut::map`]
* [`ptr::drop_in_place`]
* [`time::Instant`]
* [`time::SystemTime`]
* [`Instant::now`]
- * [`Instant::duration_since`][] (renamed from `duration_from_earlier`)
+ * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
* [`Instant::elapsed`]
* [`SystemTime::now`]
- * [`SystemTime::duration_since`][] (renamed from `duration_from_earlier`)
+ * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
* [`SystemTime::elapsed`]
* Various `Add`/`Sub` impls for `Time` and `SystemTime`
* [`SystemTimeError`]
targets can be specified together. [RFC 1361].
* [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
`RUSTDOC` take precedence over the `build.target-dir`,
- `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
+ `build.rustc`, and `build.rustdoc` configuration values][1.8cfv].
* [The child process tree is killed on Windows when Cargo is
killed][1.8ck].
* [The `build.target` configuration value sets the target platform,
[1.8ck]: https://github.com/rust-lang/cargo/pull/2370
[1.8ct]: https://github.com/rust-lang/cargo/pull/2335
[1.8cu]: https://github.com/rust-lang/rust/pull/31390
-[1.8cv]: https://github.com/rust-lang/cargo/issues/2365
+[1.8cfv]: https://github.com/rust-lang/cargo/issues/2365
[1.8cv]: https://github.com/rust-lang/rust/pull/30998
[1.8h]: https://github.com/rust-lang/rust/pull/31460
[1.8l]: https://github.com/rust-lang/rust/pull/31668
* Stabilized APIs
* `Path`
- * [`Path::strip_prefix`][] (renamed from relative_from)
- * [`path::StripPrefixError`][] (new error type returned from strip_prefix)
+ * [`Path::strip_prefix`] (renamed from relative_from)
+ * [`path::StripPrefixError`] (new error type returned from strip_prefix)
* `Ipv4Addr`
* [`Ipv4Addr::is_loopback`]
* [`Ipv4Addr::is_private`]
* Stabilized APIs:
[`Read::read_exact`],
- [`ErrorKind::UnexpectedEof`][] (renamed from `UnexpectedEOF`),
+ [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
[`fs::DirBuilder`], [`fs::DirBuilder::new`],
[`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
[`os::unix::fs::DirBuilderExt`],
[`collections::hash_set::HashSet::drain`],
[`collections::binary_heap::Drain`],
[`collections::binary_heap::BinaryHeap::drain`],
- [`Vec::extend_from_slice`][] (renamed from `push_all`),
+ [`Vec::extend_from_slice`] (renamed from `push_all`),
[`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
[`RwLock::into_inner`],
- [`Iterator::min_by_key`][] (renamed from `min_by`),
- [`Iterator::max_by_key`][] (renamed from `max_by`).
+ [`Iterator::min_by_key`] (renamed from `min_by`),
+ [`Iterator::max_by_key`] (renamed from `max_by`).
* The [core library][1.6co] is stable, as are most of its APIs.
* [The `assert_eq!` macro supports arguments that don't implement
`Sized`][1.6ae], such as arrays. In this way it behaves more like
algorithm][s].
* [`std::io::copy` allows `?Sized` arguments][cc].
* The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
- [override `count`, `nth` and `last` with an O(1)
+ [override `count`, `nth` and `last` with an *O*(1)
implementation][it].
* [`Default` is implemented for arrays up to `[T; 32]`][d].
* [`IntoRawFd` has been added to the Unix-specific prelude,
* The compiler gained many new extended error descriptions, which can
be accessed with the `--explain` flag.
* The `dropck` pass, which checks that destructors can't access
- destroyed values, [has been rewritten][dropck]. This fixes some
+ destroyed values, [has been rewritten][27261]. This fixes some
soundness holes, and as such will cause some previously-compiling
code to no longer build.
* `rustc` now uses [LLVM to write archive files where possible][ar].
Eventually this will eliminate the compiler's dependency on the ar
utility.
-* Rust has [preliminary support for i686 FreeBSD][fb] (it has long
+* Rust has [preliminary support for i686 FreeBSD][26959] (it has long
supported FreeBSD on x86_64).
* The [`unused_mut`][lum], [`unconditional_recursion`][lur],
[`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
[ar]: https://github.com/rust-lang/rust/pull/26926
[b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
[dms]: https://github.com/rust-lang/rust/pull/26241
-[dropck]: https://github.com/rust-lang/rust/pull/27261
+[27261]: https://github.com/rust-lang/rust/pull/27261
[dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
[ds]: https://github.com/rust-lang/rust/pull/26818
[dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
[dst3]: https://github.com/rust-lang/rust/pull/27351
[e]: https://github.com/rust-lang/rust/pull/24793
[f]: https://github.com/rust-lang/rust/pull/26588
-[fb]: https://github.com/rust-lang/rust/pull/26959
+[26959]: https://github.com/rust-lang/rust/pull/26959
[fl]: https://github.com/rust-lang/rust-installer/pull/41
-[hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
[ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
[iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
[iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
* The `Default` implementation for `Arc` [no longer requires `Sync +
Send`][arc].
* [The `Iterator` methods `count`, `nth`, and `last` have been
- overridden for slices to have O(1) performance instead of O(n)][si].
+ overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
* Incorrect handling of paths on Windows has been improved in both the
compiler and the standard library.
* [`AtomicPtr` gained a `Default` implementation][ap].
to rustc.
* [Android executables are always position independent][pie].
* [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
- with `Drop`][drop].
+ with `Drop`][24935].
[`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
[`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
[`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
[ll]: https://github.com/rust-lang/rust/pull/26022
[`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
-[drop]: https://github.com/rust-lang/rust/pull/24935
+[24935]: https://github.com/rust-lang/rust/pull/24935
Version 1.0.0 (2015-05-15)
========================
property: generic code cannot behave differently for different type
arguments except in minor ways.
* The `unsafe_destructor` feature is now deprecated in favor of the
- [new `dropck`][dropck]. This change is a major reduction in unsafe
+ [new `dropck`][rfc769]. This change is a major reduction in unsafe
code.
Libraries
* The `thread_local` module [has been renamed to `std::thread`][th].
* The methods of `IteratorExt` [have been moved to the `Iterator`
- trait itself][ie].
+ trait itself][23300].
* Several traits that implement Rust's conventions for type
conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
[centralized in the `std::convert` module][con].
* [In method resolution, object methods are resolved before inherent
methods][meth].
* [`String::from_str` has been deprecated in favor of the `From` impl,
- `String::from`][sf].
+ `String::from`][24517].
* [`io::Error` implements `Sync`][ios].
* [The `words` method on `&str` has been replaced with
`split_whitespace`][sw], to avoid answering the tricky question, 'what is
[con]: https://github.com/rust-lang/rust/pull/23875
[cr]: https://github.com/rust-lang/rust/pull/23419
[fe]: https://github.com/rust-lang/rust/pull/23879
-[ie]: https://github.com/rust-lang/rust/pull/23300
+[23300]: https://github.com/rust-lang/rust/pull/23300
[inv]: https://github.com/rust-lang/rust/pull/23938
[ios]: https://github.com/rust-lang/rust/pull/24133
[lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
[meth]: https://github.com/rust-lang/rust/pull/24056
[pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
[po]: https://github.com/rust-lang/rust/pull/24270
-[sf]: https://github.com/rust-lang/rust/pull/24517
+[24517]: https://github.com/rust-lang/rust/pull/24517
[slp]: https://github.com/rust-lang/rust/pull/23949
[spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
[sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
[conversion]: https://github.com/rust-lang/rfcs/pull/529
[num-traits]: https://github.com/rust-lang/rust/pull/23549
[index-value]: https://github.com/rust-lang/rust/pull/23601
-[dropck]: https://github.com/rust-lang/rfcs/pull/769
+[rfc769]: https://github.com/rust-lang/rfcs/pull/769
[ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
[fn-inherit]: https://github.com/rust-lang/rust/pull/23282
[fn-blanket]: https://github.com/rust-lang/rust/pull/23895
* extra: Implementation of fixed output size variations of SHA-2.
* Tooling
- * `unused_variable` lint mode for unused variables (default: warn).
+ * `unused_variables` lint mode for unused variables (default: warn).
* `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
(default: warn).
* `unused_mut` lint mode for identifying unused `mut` qualifiers
projects / rustc.git / blobdiff