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Jul 13, 2020
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[stable] 1.45 release #74297

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Cherry-pick release notes from master
Mark-Simulacrum Jul 13, 2020
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Stable 1.45.0 release
Mark-Simulacrum Jul 13, 2020
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173 changes: 168 additions & 5 deletions RELEASES.md
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Version 1.45.0 (2020-07-16)
==========================

Language
--------
- [Out of range float to int conversions using `as` has been defined as a saturating
conversion.][71269] This was previously undefined behaviour, but you can use the
`{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
may be desirable in rare performance sensitive situations.
- [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
using `u64`.][70705]
- [Function like procedural macros can now be used in expression, pattern, and statement
positions.][68717] This means you can now use a function-like procedural macro
anywhere you can use a declarative (`macro_rules!`) macro.

Compiler
--------
- [You can now override individual target features through the `target-feature`
flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
equivalent to `-C target-feature=+avx2,+fma`.
- [Added the `force-unwind-tables` flag.][69984] This option allows
rustc to always generate unwind tables regardless of panic strategy.
- [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
to include LLVM bitcode into generated `rlib`s (this is on by default).
- [Added the `tiny` value to the `code-model` codegen flag.][72397]
- [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
- [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]

\* Refer to Rust's [platform support page][forge-platform-support] for more
information on Rust's tiered platform support.


Libraries
---------
- [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
and `Ord`.][72239]
- [`proc_macro::TokenStream` now implements `Default`.][72234]
- [You can now use `char` with
`ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
a range of codepoints.][72413] E.g.
you can now write the following;
```rust
for ch in 'a'..='z' {
print!("{}", ch);
}
println!();
// Prints "abcdefghijklmnopqrstuvwxyz"
```
- [`OsString` now implements `FromStr`.][71662]
- [The `saturating_neg` method as been added to all signed integer primitive
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Suggested change
- [The `saturating_neg` method as been added to all signed integer primitive
- [The `saturating_neg` method has been added to all signed integer primitive

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Feel free to file a PR against master -- it won't make it into this stable release, but it should make it into the next one. Thanks!

types, and the `saturating_abs` method has been added for all integer
primitive types.][71886]
- [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
or `Path`.][71447]
- [`Box<[T]>` now implements `From<[T; N]>`.][71095]
- [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
integer types.][69813]
- [The `fetch_min`, and `fetch_max` methods have been added to all atomic
integer types.][72324]
- [The `fetch_update` method has been added to all atomic integer types.][71843]

Stabilized APIs
---------------
- [`Arc::as_ptr`]
- [`BTreeMap::remove_entry`]
- [`Rc::as_ptr`]
- [`rc::Weak::as_ptr`]
- [`rc::Weak::from_raw`]
- [`rc::Weak::into_raw`]
- [`str::strip_prefix`]
- [`str::strip_suffix`]
- [`sync::Weak::as_ptr`]
- [`sync::Weak::from_raw`]
- [`sync::Weak::into_raw`]
- [`char::UNICODE_VERSION`]
- [`Span::resolved_at`]
- [`Span::located_at`]
- [`Span::mixed_site`]
- [`unix::process::CommandExt::arg0`]

Cargo
-----

Misc
----
- [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
`~~outdated information~~` becomes "~~outdated information~~".
- [Added an emoji to Rustdoc's deprecated API message.][72014]

Compatibility Notes
-------------------
- [Trying to self initialize a static value (that is creating a value using
itself) is unsound and now causes a compile error.][71140]
- [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
- [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
previously undocumented and not intended for public use. Rustdoc still provides
a non-zero exit code on errors.

Internals Only
--------------
- [Make clippy a git subtree instead of a git submodule][70655]
- [Unify the undo log of all snapshot types][69464]

[73420]: https://github.com/rust-lang/rust/issues/73420/
[72324]: https://github.com/rust-lang/rust/pull/72324/
[71843]: https://github.com/rust-lang/rust/pull/71843/
[71886]: https://github.com/rust-lang/rust/pull/71886/
[72234]: https://github.com/rust-lang/rust/pull/72234/
[72239]: https://github.com/rust-lang/rust/pull/72239/
[72397]: https://github.com/rust-lang/rust/pull/72397/
[72413]: https://github.com/rust-lang/rust/pull/72413/
[72014]: https://github.com/rust-lang/rust/pull/72014/
[72062]: https://github.com/rust-lang/rust/pull/72062/
[72094]: https://github.com/rust-lang/rust/pull/72094/
[72133]: https://github.com/rust-lang/rust/pull/72133/
[71900]: https://github.com/rust-lang/rust/pull/71900/
[71928]: https://github.com/rust-lang/rust/pull/71928/
[71662]: https://github.com/rust-lang/rust/pull/71662/
[71716]: https://github.com/rust-lang/rust/pull/71716/
[71447]: https://github.com/rust-lang/rust/pull/71447/
[71269]: https://github.com/rust-lang/rust/pull/71269/
[71095]: https://github.com/rust-lang/rust/pull/71095/
[71140]: https://github.com/rust-lang/rust/pull/71140/
[70655]: https://github.com/rust-lang/rust/pull/70655/
[70705]: https://github.com/rust-lang/rust/pull/70705/
[69984]: https://github.com/rust-lang/rust/pull/69984/
[69813]: https://github.com/rust-lang/rust/pull/69813/
[69464]: https://github.com/rust-lang/rust/pull/69464/
[68717]: https://github.com/rust-lang/rust/pull/68717/
[`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
[`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
[`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
[`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
[`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
[`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
[`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
[`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
[`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
[`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
[`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
[`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
[`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
[`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
[`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
[`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0


Version 1.44.1 (2020-06-18)
===========================

* [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
* [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
* [Fix crashes when finding backtrace on macOS.][71397]
* [Clippy applies lint levels into different files.][clippy/5356]

[71397]: https://github.com/rust-lang/rust/issues/71397
[73078]: https://github.com/rust-lang/rust/issues/73078
[cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
[clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356


Version 1.44.0 (2020-06-04)
==========================

Expand Down Expand Up @@ -25,7 +188,7 @@ Compiler
--------
- [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
Additionally when in incremental mode rustc defaults to 256 codegen units.
- [Refactored `catch_unwind`, to have zero-cost unless unwinding is enabled and
- [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
a panic is thrown.][67502]
- [Added tier 3\* support for the `aarch64-unknown-none` and
`aarch64-unknown-none-softfloat` targets.][68334]
Expand Down Expand Up @@ -100,15 +263,15 @@ Compatibility Notes
- [Removed the `-C no_integrated_as` flag from rustc.][70345]
- [The `file_name` property in JSON output of macro errors now points the actual
source file rather than the previous format of `<NAME macros>`.][70969]
**Note:** this may not point a file that actually exists on the user's system.
**Note:** this may not point to a file that actually exists on the user's system.
- [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
- [`mem::{zeroed, uninitialised}` will now panic when used with types that do
not allow zero initialization such as `NonZeroU8`.][66059] This was
previously a warning.
- [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
operator has been defined as a saturating operation.][71269] This was previously
undefined behaviour, you can use the `{f64, f32}::to_int_unchecked` methods to
continue using the current behaviour which may desirable in rare performance
undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
continue using the current behaviour, which may be desirable in rare performance
sensitive situations.

Internal Only
Expand Down Expand Up @@ -912,7 +1075,7 @@ Compatibility Notes
[`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
[`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
[`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
[forge-platform-support]: https://forge.rust-lang.org/platform-support.html
[forge-platform-support]: https://forge.rust-lang.org/release/platform-support.html
[pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199

Version 1.37.0 (2019-08-15)
Expand Down
2 changes: 1 addition & 1 deletion src/ci/run.sh
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Expand Up @@ -51,7 +51,7 @@ fi
#
# FIXME: need a scheme for changing this `nightly` value to `beta` and `stable`
# either automatically or manually.
export RUST_RELEASE_CHANNEL=beta
export RUST_RELEASE_CHANNEL=stable

# Always set the release channel for bootstrap; this is normally not important (i.e., only dist
# builds would seem to matter) but in practice bootstrap wants to know whether we're targeting
Expand Down