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Update RELEASES.md for 1.47.0
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Erin Power
Mark Rousskov
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RELEASES.md
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RELEASES.md
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Version 1.47.0 (2020-10-08)
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==========================
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Language
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--------
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- [Closures will now warn when not used.][74869]
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Compiler
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--------
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- [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
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[Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
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platforms.
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- [Upgraded to LLVM 11.][73526]
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- [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
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- [Upgrade the FreeBSD toolchain to version 11.4][75204]
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- [`RUST_BACKTRACE`'s output is now more compact.][75048]
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\* Refer to Rust's [platform support page][forge-platform-support] 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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- [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
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- [Traits in `std`/`core` are now implemented for arrays of any length, not just
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those of length less than 33.][74060]
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- [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
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- [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
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`PartialEq`, and `PartialOrd`.][73583]
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Stabilized APIs
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---------------
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- [`Ident::new_raw`]
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- [`Range::is_empty`]
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- [`RangeInclusive::is_empty`]
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- [`Result::as_deref`]
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- [`Result::as_deref_mut`]
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- [`Vec::leak`]
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- [`pointer::offset_from`]
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- [`f32::TAU`]
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- [`f64::TAU`]
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The following previously stable APIs have now been made const.
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- [The `new` method for all `NonZero` integers.][73858]
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- [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
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`checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
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methods for all integers.][73858]
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- [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
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signed integers.][73858]
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- [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
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`is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
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`is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
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`is_ascii_control` methods for `char` and `u8`.][73858]
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Cargo
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-----
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- [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
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You can override this by setting the following in your `Cargo.toml`.
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```toml
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[profile.release.build-override]
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opt-level = 3
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```
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- [`cargo-help` will now display man pages for commands rather just the
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`--help` text.][cargo/8456]
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- [`cargo-metadata` now emits a `test` field indicating if a target has
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tests enabled.][cargo/8478]
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- [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
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- [`cargo-publish` will now use an alternative registry by default if it's the
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only registry specified in `package.publish`.][cargo/8571]
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Misc
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----
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- [Added a help button beside Rustdoc's searchbar that explains rustdoc's
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type based search.][75366]
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- [Added the Ayu theme to rustdoc.][71237]
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Compatibility Notes
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-------------------
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- [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
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- [Fixed a regression parsing `{} && false` in tail expressions.][74650]
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- [Added changes to how proc-macros are expanded in `macro_rules!` that should
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help to preserve more span information.][73084] These changes may cause
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compiliation errors if your macro was unhygenic or didn't correctly handle
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`Delimiter::None`.
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- [Moved support for the CloudABI target to tier 3.][75568]
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- [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
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- [Added the `rustc-docs` component.][75560] This allows you to install
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and read the documentation for the compiler internal APIs. (Currently only
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available for `x86_64-unknown-linux-gnu`.)
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Internal Only
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--------
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- [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.
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[1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
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[75048]: https://github.com/rust-lang/rust/pull/75048/
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[74163]: https://github.com/rust-lang/rust/pull/74163/
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[71237]: https://github.com/rust-lang/rust/pull/71237/
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[74869]: https://github.com/rust-lang/rust/pull/74869/
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[73858]: https://github.com/rust-lang/rust/pull/73858/
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[75716]: https://github.com/rust-lang/rust/pull/75716/
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[75908]: https://github.com/rust-lang/rust/pull/75908/
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[75516]: https://github.com/rust-lang/rust/pull/75516/
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[75560]: https://github.com/rust-lang/rust/pull/75560/
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[75568]: https://github.com/rust-lang/rust/pull/75568/
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[75366]: https://github.com/rust-lang/rust/pull/75366/
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[75204]: https://github.com/rust-lang/rust/pull/75204/
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[74650]: https://github.com/rust-lang/rust/pull/74650/
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[74419]: https://github.com/rust-lang/rust/pull/74419/
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[73964]: https://github.com/rust-lang/rust/pull/73964/
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[74021]: https://github.com/rust-lang/rust/pull/74021/
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[74060]: https://github.com/rust-lang/rust/pull/74060/
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[73893]: https://github.com/rust-lang/rust/pull/73893/
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[73526]: https://github.com/rust-lang/rust/pull/73526/
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[73583]: https://github.com/rust-lang/rust/pull/73583/
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[73084]: https://github.com/rust-lang/rust/pull/73084/
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[73197]: https://github.com/rust-lang/rust/pull/73197/
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[72488]: https://github.com/rust-lang/rust/pull/72488/
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[cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
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[cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
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[cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
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[cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
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[cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
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[`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
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[`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
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[`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
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[`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
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[`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
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[`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
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[`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
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[`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
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[`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
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[`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
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Version 1.46.0 (2020-08-27)
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==========================
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