Rollup merge of #88055 - Mark-Simulacrum:relnotes-1.55, r=Mark-Simulacrum
Update RELEASES.md for 1.55.0 Reopening https://github.com/rust-lang/rust/pull/87624 after some edits and a force-push caused GitHub to close the PR.
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Mara Bos
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RELEASES.md
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RELEASES.md
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Version 1.55.0 (2021-09-09)
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============================
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Language
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--------
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- [You can now write open "from" range patterns (`X..`), which will start at `X` and
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will end at the maximum value of the integer.][83918]
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- [You can now explicitly import the prelude of different editions
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through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
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Compiler
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--------
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- [Added tier 3\* support for `powerpc-unknown-freebsd`.][87370]
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- [Added tier 3 support for `powerpc64le-unknown-freebsd`.][83572]
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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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- [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
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These improvements should in general provide faster string parsing of floats,
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no longer reject certain valid floating point values, and reduce
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the produced code size for non-stripped artifacts.
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- [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
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- [`collections::{BinaryHeap, BTreeSet, HashSet, LinkedList, VecDeque}` now
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implement `From<[T; N]>`.][84111]
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- [`collections::{BTreeMap, HashMap}` now implement `From<[(K, V); N]>`.][84111]
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This allows you to write the following;
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```rust
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let highscores = std::collections::HashMap::from([
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("Alice", 9000u32),
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("Bob", 7250),
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("Charlie", 5500),
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]);
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```
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Stabilised APIs
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---------------
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- [`Bound::cloned`]
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- [`Drain::as_str`]
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- [`IntoInnerError::into_error`]
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- [`IntoInnerError::into_parts`]
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- [`MaybeUninit::assume_init_mut`]
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- [`MaybeUninit::assume_init_ref`]
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- [`MaybeUninit::write`]
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- [`array::map`]
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- [`ops::ControlFlow`]
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- [`x86::_bittest`]
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- [`x86::_bittestandcomplement`]
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- [`x86::_bittestandreset`]
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- [`x86::_bittestandset`]
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- [`x86_64::_bittest64`]
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- [`x86_64::_bittestandcomplement64`]
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- [`x86_64::_bittestandreset64`]
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- [`x86_64::_bittestandset64`]
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The following previously stable functions are now `const`.
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- [`str::from_utf8_unchecked`]
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- [`mem::transmute`]
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Cargo
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-----
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- [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
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rustc in parallel such as when using `cargo test`.][cargo/9675]
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- [The package definition in `cargo metadata` now includes the `"default_run"`
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field from the manifest.][cargo/9550]
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- [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
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Rustdoc
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-------
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- [Added "Go to item on exact match" search option.][85876]
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- [The "Implementors" section on traits no longer shows redundant
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method definitions.][85970]
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- [Trait implementations are toggled open by default.][86260] This should make the
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implementations more searchable by tools like `CTRL+F` in your browser.
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- [Intra-doc links should now correctly resolve associated items (e.g. methods)
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through type aliases.][86334]
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- [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
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"Trait Implementations" section.][86513]
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Compatibility Notes
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-------------------
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- [std functions that return an `io::Error` will no longer use the
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`ErrorKind::Other` variant.][85746] This is to better reflect that these
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kinds of errors could be categorised [into newer more specific `ErrorKind`
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variants][79965], and that they do not represent a user error.
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- [Using environment variable names with `process::Command` on Windows now
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behaves as expected.][85270] Previously using envionment variables with
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`Command` would cause them to be ASCII-uppercased.
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- [Rustdoc will now warn on using rustdoc lints that aren't prefixed
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with `rustdoc::`][86849]
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[86849]: https://github.com/rust-lang/rust/pull/86849
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[86513]: https://github.com/rust-lang/rust/pull/86513
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[86334]: https://github.com/rust-lang/rust/pull/86334
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[86260]: https://github.com/rust-lang/rust/pull/86260
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[85970]: https://github.com/rust-lang/rust/pull/85970
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[85876]: https://github.com/rust-lang/rust/pull/85876
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[83572]: https://github.com/rust-lang/rust/pull/83572
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[86294]: https://github.com/rust-lang/rust/pull/86294
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[86858]: https://github.com/rust-lang/rust/pull/86858
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[86761]: https://github.com/rust-lang/rust/pull/86761
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[85769]: https://github.com/rust-lang/rust/pull/85769
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[85746]: https://github.com/rust-lang/rust/pull/85746
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[85305]: https://github.com/rust-lang/rust/pull/85305
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[85270]: https://github.com/rust-lang/rust/pull/85270
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[84111]: https://github.com/rust-lang/rust/pull/84111
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[83918]: https://github.com/rust-lang/rust/pull/83918
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[79965]: https://github.com/rust-lang/rust/pull/79965
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[87370]: https://github.com/rust-lang/rust/pull/87370
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[87298]: https://github.com/rust-lang/rust/pull/87298
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[cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
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[cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
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[cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
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[`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
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[`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
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[`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
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[`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
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[`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
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[`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
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[`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
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[`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
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[`Seek::rewind`]: https://doc.rust-lang.org/stable/std/io/trait.Seek.html#method.rewind
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[`mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
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[`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
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[`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
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[`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
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[`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
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[`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
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[`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
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[`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
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[`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
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[`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
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[`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
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Version 1.54.0 (2021-07-29)
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============================
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