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Rollup merge of #101093 - joshtriplett:relnotes-1.64, r=Mark-Simulacrum
Initial version of 1.64 release notes Needs further expansion on some points, with text that will likely end up in the blog post as well. Also adds the release notes from 1.62.1 and 1.63, which weren't present on the branch.
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Matthias Krüger
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152
RELEASES.md
152
RELEASES.md
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Version 1.64.0 (2022-09-22)
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===========================
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Language
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--------
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- [make `const_err` show up in future breakage reports](https://github.com/rust-lang/rust/pull/97743/)
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- [allow unions with mutable references and tuples of allowed types](https://github.com/rust-lang/rust/pull/97995/)
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- 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/)
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- 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.
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Compiler
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--------
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- 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/)
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- [Keep unstable target features for asm feature checking](https://github.com/rust-lang/rust/pull/99155/)
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- [Add Nintendo Switch as tier 3 target](https://github.com/rust-lang/rust/pull/88991/)
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- Refer to Rust's [platform support page][platform-support-doc] for more
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information on Rust's tiered platform support.
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- [Only compile #[used] as llvm.compiler.used for ELF targets](https://github.com/rust-lang/rust/pull/93718/)
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- [sess: stabilize `-Zterminal-width` as `--diagnostic-width`](https://github.com/rust-lang/rust/pull/95635/)
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- [Fix repr(align) enum handling](https://github.com/rust-lang/rust/pull/96814/)
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- [Suggest defining variable as mutable on `&mut _` type mismatch in pats](https://github.com/rust-lang/rust/pull/98431/)
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- [Emit warning when named arguments are used positionally in format](https://github.com/rust-lang/rust/pull/98580/)
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- [Add support for link-flavor rust-lld for iOS, tvOS and watchOS](https://github.com/rust-lang/rust/pull/98771/)
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- [Do not mention private types from other crates as impl candidates](https://github.com/rust-lang/rust/pull/99091/)
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Libraries
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---------
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- [Implement network primitives with ideal Rust layout, not C system layout](https://github.com/rust-lang/rust/pull/78802/)
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- [Remove restrictions on compare-exchange memory ordering.](https://github.com/rust-lang/rust/pull/98383/)
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- You can now `write!` or `writeln!` into an `OsString`: [Implement `fmt::Write` for `OsString`](https://github.com/rust-lang/rust/pull/97915/)
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- [Enforce that layout size fits in isize in Layout](https://github.com/rust-lang/rust/pull/95295/)
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- [Make RwLockReadGuard covariant](https://github.com/rust-lang/rust/pull/96820/)
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- [Implement `FusedIterator` for `std::net::[Into]Incoming`](https://github.com/rust-lang/rust/pull/97300/)
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- [`impl<T: AsRawFd> AsRawFd for {Arc,Box}<T>`](https://github.com/rust-lang/rust/pull/97437/)
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- [ptr::copy and ptr::swap are doing untyped copies](https://github.com/rust-lang/rust/pull/97712/)
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- [Add assertion that `transmute_copy`'s U is not larger than T](https://github.com/rust-lang/rust/pull/98839/)
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- [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.
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- [Add cgroupv1 support to `available_parallelism`](https://github.com/rust-lang/rust/pull/97925/)
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- [mem::uninitialized: mitigate many incorrect uses of this function](https://github.com/rust-lang/rust/pull/99182/)
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Stabilized APIs
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---------------
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- [`ffi::CStr`](https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html)
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- [`ffi::CString`](https://doc.rust-lang.org/stable/std/ffi/struct.CString.html)
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- [`ffi::FromBytesWithNulError`](https://doc.rust-lang.org/stable/std/ffi/struct.FromBytesWithNulError.html)
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- [`ffi::FromVecWithNulError`](https://doc.rust-lang.org/stable/std/ffi/struct.FromVecWithNulError.html)
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- [`ffi::IntoStringError`](https://doc.rust-lang.org/stable/std/ffi/struct.IntoStringError.html)
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- [`ffi::NulError`](https://doc.rust-lang.org/stable/std/ffi/struct.NulError.html)
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- [`ffi::c_char`](https://doc.rust-lang.org/stable/std/ffi/type.c_char.html)
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- [`ffi::c_double`](https://doc.rust-lang.org/stable/std/ffi/type.c_double.html)
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- [`ffi::c_float`](https://doc.rust-lang.org/stable/std/ffi/type.c_float.html)
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- [`ffi::c_int`](https://doc.rust-lang.org/stable/std/ffi/type.c_int.html)
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- [`ffi::c_long`](https://doc.rust-lang.org/stable/std/ffi/type.c_long.html)
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- [`ffi::c_longlong`](https://doc.rust-lang.org/stable/std/ffi/type.c_longlong.html)
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- [`ffi::c_schar`](https://doc.rust-lang.org/stable/std/ffi/type.c_schar.html)
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- [`ffi::c_short`](https://doc.rust-lang.org/stable/std/ffi/type.c_short.html)
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- [`ffi::c_uchar`](https://doc.rust-lang.org/stable/std/ffi/type.c_uchar.html)
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- [`ffi::c_uint`](https://doc.rust-lang.org/stable/std/ffi/type.c_uint.html)
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- [`ffi::c_ulong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulong.html)
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- [`ffi::c_ulonglong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulonglong.html)
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- [`ffi::c_ushort`](https://doc.rust-lang.org/stable/std/ffi/type.c_ushort.html)
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- [`future::IntoFuture`](https://doc.rust-lang.org/stable/std/future/trait.IntoFuture.html)
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- [`future::poll_fn`](https://doc.rust-lang.org/stable/std/future/fn.poll_fn.html)
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- [`task::ready!`](https://doc.rust-lang.org/stable/std/task/macro.ready.html)
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- [`num::NonZero*::checked_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_mul)
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- [`num::NonZero*::checked_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_pow)
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- [`num::NonZero*::saturating_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_mul)
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- [`num::NonZero*::saturating_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_pow)
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- [`num::NonZeroI*::abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.abs)
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- [`num::NonZeroI*::checked_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.checked_abs)
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- [`num::NonZeroI*::overflowing_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.overflowing_abs)
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- [`num::NonZeroI*::saturating_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.saturating_abs)
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- [`num::NonZeroI*::unsigned_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.unsigned_abs)
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- [`num::NonZeroI*::wrapping_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.wrapping_abs)
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- [`num::NonZeroU*::checked_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_add)
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- [`num::NonZeroU*::checked_next_power_of_two`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_next_power_of_two)
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- [`num::NonZeroU*::saturating_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_add)
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- [`os::unix::process::CommandExt::process_group`](https://doc.rust-lang.org/stable/std/os/unix/process/trait.CommandExt.html#tymethod.process_group)
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- [`os::windows::fs::FileTypeExt::is_symlink_dir`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_dir)
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- [`os::windows::fs::FileTypeExt::is_symlink_file`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_file)
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These APIs are now usable in const contexts:
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- [`slice::from_raw_parts`](https://doc.rust-lang.org/stable/core/slice/fn.from_raw_parts.html)
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Cargo
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-----
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- Packages can now inherit settings from the workspace so that the settings
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can be centralized in one place. See
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[`workspace.package`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacepackage-table)
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and
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[`workspace.dependencies`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacedependencies-table)
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for more details on how to define these common settings.
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[#10859](https://github.com/rust-lang/cargo/pull/10859)
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- Cargo commands can now accept multiple `--target` flags to build for
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multiple targets at once, and the
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[`build.target`](https://doc.rust-lang.org/nightly/cargo/reference/config.html#buildtarget)
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config option may now take an array of multiple targets.
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[#10766](https://github.com/rust-lang/cargo/pull/10766)
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- The `--jobs` argument can now take a negative number to count backwards from
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the max CPUs.
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[#10844](https://github.com/rust-lang/cargo/pull/10844)
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- `cargo add` will now update `Cargo.lock`.
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[#10902](https://github.com/rust-lang/cargo/pull/10902)
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- Added the
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[`--crate-type`](https://doc.rust-lang.org/nightly/cargo/commands/cargo-rustc.html#option-cargo-rustc---crate-type)
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flag to `cargo rustc` to override the crate type.
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[#10838](https://github.com/rust-lang/cargo/pull/10838)
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- Significantly improved the performance fetching git dependencies from GitHub
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when using a hash in the `rev` field.
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[#10079](https://github.com/rust-lang/cargo/pull/10079)
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Misc
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----
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- [Let rust-analyzer ship on stable, non-preview](https://github.com/rust-lang/rust/pull/98640/)
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Compatibility Notes
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-------------------
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- 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/)
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- [Implement network primitives with ideal Rust layout, not C system layout](https://github.com/rust-lang/rust/pull/78802/)
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- [Add assertion that `transmute_copy`'s U is not larger than T](https://github.com/rust-lang/rust/pull/98839/)
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- [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.
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- [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.
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- [Relate late-bound closure lifetimes to parent fn in NLL](https://github.com/rust-lang/rust/pull/98835/)
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- [Errors at const-eval time are now in future incompatibility reports](https://github.com/rust-lang/rust/pull/97743/)
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- 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/).
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- [`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.
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Internal Changes
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----------------
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These changes do not affect any public interfaces of Rust, but they represent
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significant improvements to the performance or internals of rustc and related
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tools.
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- 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/)
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- [Stop keeping metadata in memory before writing it to disk](https://github.com/rust-lang/rust/pull/96544/)
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- [compiletest: strip debuginfo by default for mode=ui](https://github.com/rust-lang/rust/pull/98140/)
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- Many improvements to generated code for derives, including performance improvements:
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- [Don't use match-destructuring for derived ops on structs.](https://github.com/rust-lang/rust/pull/98446/)
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- [Many small deriving cleanups](https://github.com/rust-lang/rust/pull/98741/)
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- [More derive output improvements](https://github.com/rust-lang/rust/pull/98758/)
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- [Clarify deriving code](https://github.com/rust-lang/rust/pull/98915/)
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- [Final derive output improvements](https://github.com/rust-lang/rust/pull/99046/)
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- [Stop injecting `#[allow(unused_qualifications)]` in generated `derive` implementations](https://github.com/rust-lang/rust/pull/99485/)
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- [Improve `derive(Debug)`](https://github.com/rust-lang/rust/pull/98190/)
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- [Bump to clap 3](https://github.com/rust-lang/rust/pull/98213/)
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- [fully move dropck to mir](https://github.com/rust-lang/rust/pull/98641/)
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- [Optimize `Vec::insert` for the case where `index == len`.](https://github.com/rust-lang/rust/pull/98755/)
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- [Convert rust-analyzer to an in-tree tool](https://github.com/rust-lang/rust/pull/99603/)
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Version 1.63.0 (2022-08-11)
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==========================
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