Updated RELEASES.md for 1.39.0
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Erin Power
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RELEASES.md
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RELEASES.md
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Version 1.39.0 (2019-11-07)
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===========================
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Language
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--------
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- [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
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`async {}` respectively, and you can now call `.await` on async expressions.][63209]
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- [You can now use certain attributes on function, closure, and function pointer
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parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
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`deny`, `forbid` as well as inert helper attributes used by procedural macro
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attributes applied to items. e.g.
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```rust
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fn len(
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#[cfg(windows)] slice: &[u16],
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#[cfg(not(windows))] slice: &[u8],
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) -> usize {
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slice.len()
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}
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```
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- [You can now take shared references to bind-by-move patterns in the `if` guards
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of `match` arms.][63118] e.g.
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```rust
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fn main() {
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let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
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match array {
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nums
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// ---- `nums` is bound by move.
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if nums.iter().sum::<u8>() == 10
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// ^------ `.iter()` implicitly takes a reference to `nums`.
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=> {
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drop(nums);
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// ----------- Legal as `nums` was bound by move and so we have ownership.
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}
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_ => unreachable!(),
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}
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}
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```
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Compiler
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--------
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- [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
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- [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
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- [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
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**Note** Cargo currently doesn't use this feature. Refer to
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[cargo#7315][cargo/7315] to track this feature's progress.
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- [You can now pass `--show-output` argument to test binaries to print the
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output of successful tests.][62600]
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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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- [`Vec::new` and `String::new` are now `const` functions.][64028]
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- [`LinkedList::new` is now a `const` function.][63684]
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- [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
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- [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
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now `const`.][63786]
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Stabilized APIs
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---------------
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- [`Pin::into_inner`]
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- [`Instant::checked_duration_since`]
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- [`Instant::saturating_duration_since`]
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Cargo
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-----
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- [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
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- [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
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`--all` is now deprecated.
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Misc
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----
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- [You can now pass `-Clinker` to rustdoc to control the linker used
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for compiling doctests.][63834]
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Compatibility Notes
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-------------------
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- [Code that was previously accepted by the old borrow checker, but rejected by
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the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
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previously a warning, and will also become a hard error in the Rust 2015
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edition in the 1.40.0 release.
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- [`rustdoc` now requires `rustc` to be installed and in the same directory to
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run tests.][63827] This should improve performance when running a large
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amount of doctests.
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- [The `try!` macro will now issue a deprecation warning.][62672] It is
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recommended to use the `?` operator instead.
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- [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
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returned `0.0`.
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[62600]: https://github.com/rust-lang/rust/pull/62600/
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[62672]: https://github.com/rust-lang/rust/pull/62672/
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[63118]: https://github.com/rust-lang/rust/pull/63118/
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[63209]: https://github.com/rust-lang/rust/pull/63209/
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[63402]: https://github.com/rust-lang/rust/pull/63402/
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[63565]: https://github.com/rust-lang/rust/pull/63565/
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[63595]: https://github.com/rust-lang/rust/pull/63595/
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[63684]: https://github.com/rust-lang/rust/pull/63684/
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[63698]: https://github.com/rust-lang/rust/pull/63698/
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[63770]: https://github.com/rust-lang/rust/pull/63770/
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[63786]: https://github.com/rust-lang/rust/pull/63786/
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[63827]: https://github.com/rust-lang/rust/pull/63827/
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[63834]: https://github.com/rust-lang/rust/pull/63834/
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[63927]: https://github.com/rust-lang/rust/pull/63927/
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[63933]: https://github.com/rust-lang/rust/pull/63933/
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[63934]: https://github.com/rust-lang/rust/pull/63934/
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[63938]: https://github.com/rust-lang/rust/pull/63938/
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[63940]: https://github.com/rust-lang/rust/pull/63940/
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[63941]: https://github.com/rust-lang/rust/pull/63941/
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[63945]: https://github.com/rust-lang/rust/pull/63945/
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[64010]: https://github.com/rust-lang/rust/pull/64010/
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[64028]: https://github.com/rust-lang/rust/pull/64028/
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[64334]: https://github.com/rust-lang/rust/pull/64334/
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[cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
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[cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
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[cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
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[`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
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[`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
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[`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
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Version 1.38.0 (2019-09-26)
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==========================
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