Updated RELEASES.md for 1.27.0
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Aaron Power
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RELEASES.md
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RELEASES.md
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Version 1.27.0 (2018-06-21)
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==========================
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Language
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--------
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- [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
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be used as an identifer.
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- [The dyn syntax is now available.][49968] This syntax is equivalent to the
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bare `Trait` syntax, and should make it clearer when being used in tandem with
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`impl Trait`. Since it is equivalent to the following syntax:
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`&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
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`Box<Trait> == Box<dyn Trait>`.
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- [Attributes on generic parameters such as types and lifetimes are
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now stable.][48851] e.g.
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`fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
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- [The `#[must_use]` attribute can now also be used on functions as well as
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types.][48925] It provides a lint that by default warns users when the
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value returned by a function has not been used.
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Compiler
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--------
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- [Added the `armv5te-unknown-linux-musl` target.][50423]
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Libraries
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---------
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- [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
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This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
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SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
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`#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
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the `cfg` attribute.
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- [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
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std are now available in core.][49896]
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- [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
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to `Self`.][49630]
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- [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
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that the operation isn't done in place.
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- [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
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the `#[must_use]` attribute][49533] to warn about unused potentially
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expensive allocations.
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Stabilized APIs
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---------------
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- [`DoubleEndedIterator::rfind`]
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- [`DoubleEndedIterator::rfold`]
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- [`DoubleEndedIterator::try_rfold`]
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- [`Duration::from_micros`]
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- [`Duration::from_nanos`]
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- [`Duration::subsec_micros`]
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- [`Duration::subsec_millis`]
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- [`HashMap::remove_entry`]
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- [`Iterator::try_fold`]
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- [`Iterator::try_for_each`]
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- [`NonNull::cast`]
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- [`Option::filter`]
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- [`String::replace_range`]
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- [`Take::set_limit`]
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- [`hint::unreachable_unchecked`]
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- [`os::unix::process::parent_id`]
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- [`process::id`]
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- [`ptr::swap_nonoverlapping`]
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- [`slice::rsplit_mut`]
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- [`slice::rsplit`]
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- [`slice::swap_with_slice`]
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Cargo
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-----
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- [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
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`readme`, and `repository` fields.][cargo/5386]
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- [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
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a different directory than `target` for placing compilation artifacts.
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- [Cargo will be adding automatic target inference for binaries, benchmarks,
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examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
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specific targets e.g. using `[[bin]]` and have other binaries in locations
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where cargo would infer a binary, Cargo will produce a warning. You can
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disable this feature ahead of time by setting any of the following `autobins`,
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`autobenches`, `autoexamples`, `autotests` to false.
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- [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
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setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
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Misc
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----
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- [Added “The Rustc book” into the official documentation.][49707]
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[“The Rustc book”] documents and teaches how to use the rustc compiler.
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- [All books available on `doc.rust-lang.org` are now searchable.][49623]
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Compatibility Notes
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-------------------
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- [Calling a `CharExt` or `StrExt` method directly on core will no longer
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work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
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compile, `"".is_empty()` will still compile.
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- [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
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will only print the inner type.][48553] e.g.
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`print!("{:?}", AtomicBool::new(true))` will print `true`
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not `AtomicBool(true)`.
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- [`?` can no longer be a separator in macros.][49719] e.g. the following will
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no longer compile.
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```rust
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macro_rules! barplus {
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($(a)?+) => {}
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}
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```
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- [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
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could enter higher numbers but they were not supported by LLVM. Up to 512MB
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alignment should cover all use cases.
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[48553]: https://github.com/rust-lang/rust/pull/48553/
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[48851]: https://github.com/rust-lang/rust/pull/48851/
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[48925]: https://github.com/rust-lang/rust/pull/48925/
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[49533]: https://github.com/rust-lang/rust/pull/49533/
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[49623]: https://github.com/rust-lang/rust/pull/49623/
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[49630]: https://github.com/rust-lang/rust/pull/49630/
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[49664]: https://github.com/rust-lang/rust/pull/49664/
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[49699]: https://github.com/rust-lang/rust/pull/49699/
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[49707]: https://github.com/rust-lang/rust/pull/49707/
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[49719]: https://github.com/rust-lang/rust/pull/49719/
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[49896]: https://github.com/rust-lang/rust/pull/49896/
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[49968]: https://github.com/rust-lang/rust/pull/49968/
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[50177]: https://github.com/rust-lang/rust/pull/50177/
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[50378]: https://github.com/rust-lang/rust/pull/50378/
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[50398]: https://github.com/rust-lang/rust/pull/50398/
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[50423]: https://github.com/rust-lang/rust/pull/50423/
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[cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
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[cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
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[cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
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[cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
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[cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
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[`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
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[`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
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[`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
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[`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
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[`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
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[`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
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[`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
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[`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
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[`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
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[`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
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[`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
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[`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
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[`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
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[`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
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[`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
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[`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
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[`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
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[`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
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[`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
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[`fs::read`]:
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[`fs::write`]:
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[`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
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[`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
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[`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
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[`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
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[“The Rustc book”]: https://doc.rust-lang.org/rustc
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Version 1.26.2 (2018-06-05)
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==========================
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@ -8,6 +162,7 @@ Compatibility Notes
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[51117]: https://github.com/rust-lang/rust/issues/51117
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Version 1.26.1 (2018-05-29)
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==========================
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@ -17,6 +172,7 @@ Tools
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- [RLS now works on Windows][50646]
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- [Rustfmt stopped badly formatting text in some cases][rustfmt/2695]
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Compatibility Notes
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--------
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