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Update RELEASES.md for 1.45.0
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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 1.45.0 (2020-07-16)
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==========================
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Language
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--------
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- [Out of range float to int conversions using `as` has been defined as a saturating
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conversion.][71269] This was previously undefined behaviour, but you can use the
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`{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
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may be desirable in rare performance sensitive situations.
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- [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
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using `u64`.][70705]
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- [Function like procedural macros can now be used in expression, pattern, and statement
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positions.][68717] This means you can now use a function-like procedural macro
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anywhere you can use a declarative (`macro_rules!`) macro.
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Compiler
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--------
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- [You can now override individual target features through the `target-feature`
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flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
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equivalent to `-C target-feature=+avx2,+fma`.
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- [Added the `force-unwind-tables` flag.][69984] This option allows
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rustc to always generate unwind tables regardless of panic strategy.
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- [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
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to include LLVM bitcode into generated `rlib`s (this is on by default).
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- [Added the `tiny` value to the `code-model` codegen flag.][72397]
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- [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
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- [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
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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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- [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
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and `Ord`.][72239]
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- [`proc_macro::TokenStream` now implements `Default`.][72234]
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- [You can now use `char` with
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`ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
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a range of codepoints.][72413] E.g.
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you can now write the following;
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```rust
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for ch in 'a'..='z' {
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print!("{}", ch);
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}
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println!();
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// Prints "abcdefghijklmnopqrstuvwxyz"
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```
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- [`OsString` now implements `FromStr`.][71662]
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- [The `saturating_neg` method as been added to all signed integer primitive
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types, and the `saturating_abs` method has been added for all integer
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primitive types.][71886]
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- [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
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implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
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or `Path`.][71447]
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- [`Box<[T]>` now implements `From<[T; N]>`.][71095]
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- [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
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integer types.][69813]
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- [The `fetch_min`, and `fetch_max` methods have been added to all atomic
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integer types.][72324]
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- [The `fetch_update` method has been added to all atomic integer types.][71843]
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Stabilized APIs
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---------------
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- [`Arc::as_ptr`]
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- [`BTreeMap::remove_entry`]
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- [`Rc::as_ptr`]
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- [`rc::Weak::as_ptr`]
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- [`rc::Weak::from_raw`]
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- [`rc::Weak::into_raw`]
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- [`str::strip_prefix`]
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- [`str::strip_suffix`]
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- [`sync::Weak::as_ptr`]
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- [`sync::Weak::from_raw`]
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- [`sync::Weak::into_raw`]
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- [`char::UNICODE_VERSION`]
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- [`Span::resolved_at`]
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- [`Span::located_at`]
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- [`Span::mixed_site`]
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- [`unix::process::CommandExt::arg0`]
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Cargo
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-----
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Misc
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----
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- [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
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`~~outdated information~~` becomes "~~outdated information~~".
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- [Added an emoji to Rustdoc's deprecated API message.][72014]
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Compatibility Notes
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-------------------
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- [Trying to self initialize a static value (that is creating a value using
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itself) is unsound and now causes a compile error.][71140]
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- [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
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This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
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- [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
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previously undocumented and not intended for public use. Rustdoc still provides
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a non-zero exit code on errors.
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Internals Only
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--------------
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- [Make clippy a git subtree instead of a git submodule][70655]
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- [Unify the undo log of all snapshot types][69464]
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[73420]: https://github.com/rust-lang/rust/issues/73420/
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[72324]: https://github.com/rust-lang/rust/pull/72324/
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[71843]: https://github.com/rust-lang/rust/pull/71843/
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[71886]: https://github.com/rust-lang/rust/pull/71886/
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[72234]: https://github.com/rust-lang/rust/pull/72234/
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[72239]: https://github.com/rust-lang/rust/pull/72239/
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[72397]: https://github.com/rust-lang/rust/pull/72397/
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[72413]: https://github.com/rust-lang/rust/pull/72413/
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[72014]: https://github.com/rust-lang/rust/pull/72014/
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[72062]: https://github.com/rust-lang/rust/pull/72062/
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[72094]: https://github.com/rust-lang/rust/pull/72094/
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[72133]: https://github.com/rust-lang/rust/pull/72133/
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[71900]: https://github.com/rust-lang/rust/pull/71900/
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[71928]: https://github.com/rust-lang/rust/pull/71928/
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[71662]: https://github.com/rust-lang/rust/pull/71662/
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[71716]: https://github.com/rust-lang/rust/pull/71716/
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[71447]: https://github.com/rust-lang/rust/pull/71447/
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[71269]: https://github.com/rust-lang/rust/pull/71269/
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[71095]: https://github.com/rust-lang/rust/pull/71095/
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[71140]: https://github.com/rust-lang/rust/pull/71140/
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[70655]: https://github.com/rust-lang/rust/pull/70655/
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[70705]: https://github.com/rust-lang/rust/pull/70705/
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[69984]: https://github.com/rust-lang/rust/pull/69984/
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[69813]: https://github.com/rust-lang/rust/pull/69813/
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[69464]: https://github.com/rust-lang/rust/pull/69464/
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[68717]: https://github.com/rust-lang/rust/pull/68717/
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[`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
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[`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
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[`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
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[`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
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[`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
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[`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
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[`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
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[`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
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[`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
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[`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
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[`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
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[`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
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[`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
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[`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
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[`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
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[`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
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Version 1.44.1 (2020-06-18)
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===========================
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* [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
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* [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
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* [Fix crashes when finding backtrace on macOS.][71397]
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* [Clippy applies lint levels into different files.][clippy/5356]
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[71397]: https://github.com/rust-lang/rust/issues/71397
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[73078]: https://github.com/rust-lang/rust/issues/73078
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[cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
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[clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
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Version 1.44.0 (2020-06-04)
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==========================
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