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Auto merge of #90004 - pietroalbini:stable-next, r=pietroalbini
Rust 1.56.0 stable release This PR bumps 1.56.0 to the stable channel. This also includes a backport for: * Latest changes to the release notes * #89867 r? `@ghost` cc `@rust-lang/release`
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‎RELEASES.md

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Version 1.56.0 (2021年10月21日)
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========================
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Language
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--------
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- [The 2021 Edition is now stable.][rust#88100]
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See [the edition guide][rust-2021-edition-guide] for more details.
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- [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
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- [Union field access is permitted in `const fn`.][rust#85769]
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[rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
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Compiler
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--------
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- [Upgrade to LLVM 13.][rust#87570]
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- [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
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- [Allow specifying a deployment target version for all iOS targets][rust#87699]
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- [Warnings can be forced on with `--force-warn`.][rust#87472]
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This feature is primarily intended for usage by `cargo fix`, rather than end users.
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- [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
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- [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
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- [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
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\* Refer to Rust's [platform support page][platform-support-doc] for more
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information on Rust's tiered platform support.
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Libraries
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---------
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- [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
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The Windows console still requires valid Unicode, but this change allows
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splitting a UTF-8 character across multiple write calls. This allows, for
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instance, programs that just read and write data buffers (e.g. copying a file
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to stdout) without regard for Unicode or character boundaries.
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- [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
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For this use case, atomics scale much better under contention.
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- [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
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- [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
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- [`impl From<[(K, V); N]>` for all collections.][rust#84111]
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- [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
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- [Treat invalid environment variable names as non-existent.][rust#86183]
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Previously, the environment functions would panic if given a variable name
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with an internal null character or equal sign (`=`). Now, these functions will
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just treat such names as non-existent variables, since the OS cannot represent
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the existence of a variable with such a name.
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Stabilised APIs
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---------------
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- [`std::os::unix::fs::chroot`]
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- [`UnsafeCell::raw_get`]
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- [`BufWriter::into_parts`]
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- [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
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These APIs were previously stable in `std`, but are now also available in `core`.
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- [`Vec::shrink_to`]
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- [`String::shrink_to`]
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- [`OsString::shrink_to`]
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- [`PathBuf::shrink_to`]
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- [`BinaryHeap::shrink_to`]
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- [`VecDeque::shrink_to`]
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- [`HashMap::shrink_to`]
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- [`HashSet::shrink_to`]
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These APIs are now usable in const contexts:
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- [`std::mem::transmute`]
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- [`[T]::first`][`slice::first`]
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- [`[T]::split_first`][`slice::split_first`]
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- [`[T]::last`][`slice::last`]
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- [`[T]::split_last`][`slice::split_last`]
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Cargo
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-----
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- [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
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This has no effect at present on dependency version selection.
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We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
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that support Rust code to include a crate's specified minimum version in the text matrix for that
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crate by default.
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Compatibility notes
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-------------------
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- [Update to new argument parsing rules on Windows.][rust#87580]
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This adjusts Rust's standard library to match the behavior of the standard
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libraries for C/C++. The rules have changed slightly over time, and this PR
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brings us to the latest set of rules (changed in 2008).
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- [Disallow the aapcs calling convention on aarch64][rust#88399]
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This was already not supported by LLVM; this change surfaces this lack of
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support with a better error message.
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- [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
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- [Warn when an escaped newline skips multiple lines.][rust#87671]
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- [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
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may return different values on glibc <= 2.24.][rust#81825]
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Rust now invokes the `clone3` system call directly, when available, to use new functionality
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available via that system call. Older versions of glibc cache the result of `getpid`, and only
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update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
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that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
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Internal changes
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----------------
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These changes provide no direct user facing benefits, but represent significant
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improvements to the internals and overall performance of rustc
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and related tools.
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- [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
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This improves the performance of most Rust builds.
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- [Unify representation of macros in internal data structures.][rust#88019]
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This change fixes a host of bugs with the handling of macros by the compiler,
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as well as rustdoc.
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[`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
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[`Iterator::intersperse`]: https://doc.rust-lang.org/stable/std/iter/trait.Iterator.html#method.intersperse
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[`Iterator::intersperse_with`]: https://doc.rust-lang.org/stable/std/iter/trait.Iterator.html#method.intersperse
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[`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
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[`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
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[`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
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[`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
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[`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
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[`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
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[`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
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[`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
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[`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
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[`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
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[`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
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[`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
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[`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
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[`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
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[`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
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[`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
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[`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
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[rust#87671]: https://github.com/rust-lang/rust/pull/87671
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[rust#86183]: https://github.com/rust-lang/rust/pull/86183
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[rust#87385]: https://github.com/rust-lang/rust/pull/87385
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[rust#88100]: https://github.com/rust-lang/rust/pull/88100
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[rust#86860]: https://github.com/rust-lang/rust/pull/86860
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[rust#84039]: https://github.com/rust-lang/rust/pull/84039
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[rust#86492]: https://github.com/rust-lang/rust/pull/86492
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[rust#88363]: https://github.com/rust-lang/rust/pull/88363
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[rust#85305]: https://github.com/rust-lang/rust/pull/85305
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[rust#87832]: https://github.com/rust-lang/rust/pull/87832
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[rust#88069]: https://github.com/rust-lang/rust/pull/88069
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[rust#87472]: https://github.com/rust-lang/rust/pull/87472
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[rust#87699]: https://github.com/rust-lang/rust/pull/87699
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[rust#87570]: https://github.com/rust-lang/rust/pull/87570
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[rust#88023]: https://github.com/rust-lang/rust/pull/88023
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[rust#87760]: https://github.com/rust-lang/rust/pull/87760
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[rust#87370]: https://github.com/rust-lang/rust/pull/87370
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[rust#87580]: https://github.com/rust-lang/rust/pull/87580
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[rust#83342]: https://github.com/rust-lang/rust/pull/83342
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[rust#83093]: https://github.com/rust-lang/rust/pull/83093
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[rust#88177]: https://github.com/rust-lang/rust/pull/88177
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[rust#88548]: https://github.com/rust-lang/rust/pull/88548
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[rust#88551]: https://github.com/rust-lang/rust/pull/88551
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[rust#88299]: https://github.com/rust-lang/rust/pull/88299
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[rust#88220]: https://github.com/rust-lang/rust/pull/88220
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[rust#85835]: https://github.com/rust-lang/rust/pull/85835
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[rust#86879]: https://github.com/rust-lang/rust/pull/86879
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[rust#86744]: https://github.com/rust-lang/rust/pull/86744
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[rust#84662]: https://github.com/rust-lang/rust/pull/84662
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[rust#86593]: https://github.com/rust-lang/rust/pull/86593
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[rust#81050]: https://github.com/rust-lang/rust/pull/81050
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[rust#81363]: https://github.com/rust-lang/rust/pull/81363
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[rust#84111]: https://github.com/rust-lang/rust/pull/84111
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[rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
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[rust#88490]: https://github.com/rust-lang/rust/pull/88490
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[rust#88269]: https://github.com/rust-lang/rust/pull/88269
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[rust#84176]: https://github.com/rust-lang/rust/pull/84176
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[rust#88399]: https://github.com/rust-lang/rust/pull/88399
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[rust#88227]: https://github.com/rust-lang/rust/pull/88227
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[rust#88200]: https://github.com/rust-lang/rust/pull/88200
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[rust#82776]: https://github.com/rust-lang/rust/pull/82776
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[rust#88077]: https://github.com/rust-lang/rust/pull/88077
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[rust#87728]: https://github.com/rust-lang/rust/pull/87728
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[rust#87050]: https://github.com/rust-lang/rust/pull/87050
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[rust#87619]: https://github.com/rust-lang/rust/pull/87619
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[rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
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[rust#88019]: https://github.com/rust-lang/rust/pull/88019
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[rust#87666]: https://github.com/rust-lang/rust/pull/87666
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Version 1.55.0 (2021年09月09日)
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============================
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- [Upgrade to Unicode 10.0.0][42999]
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- [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
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- [Skip the main thread's manual stack guard on Linux][43072]
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- [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
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- [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
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- [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
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previously 2^15.
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- [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
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algorithm][s].
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* [`std::io::copy` allows `?Sized` arguments][cc].
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* The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
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[override `count`, `nth` and `last` with an O(1)
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[override `count`, `nth` and `last` with an *O*(1)
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implementation][it].
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* [`Default` is implemented for arrays up to `[T; 32]`][d].
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* [`IntoRawFd` has been added to the Unix-specific prelude,
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* The `Default` implementation for `Arc` [no longer requires `Sync +
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Send`][arc].
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* [The `Iterator` methods `count`, `nth`, and `last` have been
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overridden for slices to have O(1) performance instead of O(n)][si].
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overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
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* Incorrect handling of paths on Windows has been improved in both the
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compiler and the standard library.
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* [`AtomicPtr` gained a `Default` implementation][ap].

‎src/ci/channel

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beta
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stable

‎src/librustdoc/visit_ast.rs

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// the rexport defines the path that a user will actually see. Accordingly,
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// we add the rexport as an item here, and then skip over the original
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// definition in `visit_item()` below.
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//
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// We also skip `#[macro_export] macro_rules!` that have already been inserted,
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// it can happen if within the same module a `#[macro_export] macro_rules!`
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// is declared but also a reexport of itself producing two exports of the same
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// macro in the same module.
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let mut inserted = FxHashSet::default();
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for export in self.cx.tcx.module_exports(CRATE_DEF_ID).unwrap_or(&[]) {
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if let Res::Def(DefKind::Macro(_), def_id) = export.res {
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if let Some(local_def_id) = def_id.as_local() {
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if self.cx.tcx.has_attr(def_id, sym::macro_export) {
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let hir_id = self.cx.tcx.hir().local_def_id_to_hir_id(local_def_id);
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let item = self.cx.tcx.hir().expect_item(hir_id);
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top_level_module.items.push((item, None));
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if inserted.insert(def_id) {
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let hir_id = self.cx.tcx.hir().local_def_id_to_hir_id(local_def_id);
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let item = self.cx.tcx.hir().expect_item(hir_id);
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top_level_module.items.push((item, None));
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}
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}
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}
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}

‎src/test/rustdoc-json/reexport/macro.rs

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// edition:2018
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#![no_core]
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#![feature(no_core)]
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// @count macro.json "$.index[*][?(@.name=='macro')].inner.items[*]" 2
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// @set repro_id = macro.json "$.index[*][?(@.name=='repro')].id"
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// @has - "$.index[*][?(@.name=='macro')].inner.items[*]" $repro_id
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#[macro_export]
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macro_rules! repro {
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() => {};
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}
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// @set repro2_id = macro.json "$.index[*][?(@.inner.name=='repro2')].id"
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// @has - "$.index[*][?(@.name=='macro')].inner.items[*]" $repro2_id
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pub use crate::repro as repro2;

‎src/test/rustdoc/issue-89852.rs

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// edition:2018
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#![no_core]
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#![feature(no_core)]
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// @matches 'issue_89852/sidebar-items.js' '"repro"'
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// @!matches 'issue_89852/sidebar-items.js' '"repro".*"repro"'
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#[macro_export]
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macro_rules! repro {
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() => {};
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}
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pub use crate::repro as repro2;

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