+Version 1.40.0 (2019-12-19)
+===========================
+
+Language
+--------
+- [You can now use tuple `struct`s and tuple `enum` variant's constructors in
+ `const` contexts.][65188] e.g.
+
+ ```rust
+ pub struct Point(i32, i32);
+
+ const ORIGIN: Point = {
+ let constructor = Point;
+
+ constructor(0, 0)
+ };
+ ```
+
+- [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
+ indicate that there may be variants or fields added in the future.][64639]
+ For example this requires adding a wild-card branch (`_ => {}`) to any match
+ statements on a non-exhaustive `enum`. [(RFC 2008)]
+- [You can now use function-like procedural macros in `extern` blocks and in
+ type positions.][63931] e.g. `type Generated = macro!();`
+- [Function-like and attribute procedural macros can now emit
+ `macro_rules!` items, so you can now have your macros generate macros.][64035]
+- [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
+ attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
+ `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
+
+Compiler
+--------
+- [Added tier 3 support\* for the
+ `thumbv7neon-unknown-linux-musleabihf` target.][66103]
+- [Added tier 3 support for the
+ `aarch64-unknown-none-softfloat` target.][64589]
+- [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
+ `mips64el-unknown-linux-muslabi64` targets.][65843]
+
+\* Refer to Rust's [platform support page][forge-platform-support] for more
+ information on Rust's tiered platform support.
+
+Libraries
+---------
+- [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
+
+Stabilized APIs
+---------------
+- [`BTreeMap::get_key_value`]
+- [`HashMap::get_key_value`]
+- [`Option::as_deref_mut`]
+- [`Option::as_deref`]
+- [`Option::flatten`]
+- [`UdpSocket::peer_addr`]
+- [`f32::to_be_bytes`]
+- [`f32::to_le_bytes`]
+- [`f32::to_ne_bytes`]
+- [`f64::to_be_bytes`]
+- [`f64::to_le_bytes`]
+- [`f64::to_ne_bytes`]
+- [`f32::from_be_bytes`]
+- [`f32::from_le_bytes`]
+- [`f32::from_ne_bytes`]
+- [`f64::from_be_bytes`]
+- [`f64::from_le_bytes`]
+- [`f64::from_ne_bytes`]
+- [`mem::take`]
+- [`slice::repeat`]
+- [`todo!`]
+
+Cargo
+-----
+- [Cargo will now always display warnings, rather than only on
+ fresh builds.][cargo/7450]
+- [Feature flags (except `--all-features`) passed to a virtual workspace will
+ now produce an error.][cargo/7507] Previously these flags were ignored.
+- [You can now publish `dev-dependencies` without including
+ a `version`.][cargo/7333]
+
+Misc
+----
+- [You can now specify the `#[cfg(doctest)]` attribute to include an item only
+ when running documentation tests with `rustdoc`.][63803]
+
+Compatibility Notes
+-------------------
+- [As previously announced, any previous NLL warnings in the 2015 edition are
+ now hard errors.][64221]
+- [The `include!` macro will now warn if it failed to include the
+ entire file.][64284] The `include!` macro unintentionally only includes the
+ first _expression_ in a file, and this can be unintuitive. This will become
+ either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
+- [Using `#[inline]` on function prototypes and consts now emits a warning under
+ `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
+ or `extern` blocks now correctly emits a hard error.
+
+[65294]: https://github.com/rust-lang/rust/pull/65294/
+[66103]: https://github.com/rust-lang/rust/pull/66103/
+[65843]: https://github.com/rust-lang/rust/pull/65843/
+[65188]: https://github.com/rust-lang/rust/pull/65188/
+[65092]: https://github.com/rust-lang/rust/pull/65092/
+[64589]: https://github.com/rust-lang/rust/pull/64589/
+[64639]: https://github.com/rust-lang/rust/pull/64639/
+[64221]: https://github.com/rust-lang/rust/pull/64221/
+[64284]: https://github.com/rust-lang/rust/pull/64284/
+[63931]: https://github.com/rust-lang/rust/pull/63931/
+[64035]: https://github.com/rust-lang/rust/pull/64035/
+[63674]: https://github.com/rust-lang/rust/pull/63674/
+[63803]: https://github.com/rust-lang/rust/pull/63803/
+[cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
+[cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
+[cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
+[cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
+[(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
+[`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
+[`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
+[`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
+[`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
+[`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
+[`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
+[`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
+[`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
+[`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
+[`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
+[`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
+[`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
+[`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
+[`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
+[`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
+[`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
+[`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
+[`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
+[`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
+[`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
+[`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
+
+
+Version 1.39.0 (2019-11-07)
+===========================
+
+Language
+--------
+- [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
+ `async {}` respectively, and you can now call `.await` on async expressions.][63209]
+- [You can now use certain attributes on function, closure, and function pointer
+ parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
+ `deny`, `forbid` as well as inert helper attributes used by procedural macro
+ attributes applied to items. e.g.
+ ```rust
+ fn len(
+ #[cfg(windows)] slice: &[u16],
+ #[cfg(not(windows))] slice: &[u8],
+ ) -> usize {
+ slice.len()
+ }
+ ```
+- [You can now take shared references to bind-by-move patterns in the `if` guards
+ of `match` arms.][63118] e.g.
+ ```rust
+ fn main() {
+ let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
+
+ match array {
+ nums
+ // ---- `nums` is bound by move.
+ if nums.iter().sum::<u8>() == 10
+ // ^------ `.iter()` implicitly takes a reference to `nums`.
+ => {
+ drop(nums);
+ // ----------- Legal as `nums` was bound by move and so we have ownership.
+ }
+ _ => unreachable!(),
+ }
+ }
+ ```
+
+
+
+Compiler
+--------
+- [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
+- [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
+- [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
+ **Note** Cargo currently doesn't use this feature. Refer to
+ [cargo#7315][cargo/7315] to track this feature's progress.
+- [You can now pass `--show-output` argument to test binaries to print the
+ output of successful tests.][62600]
+
+
+\* Refer to Rust's [platform support page][forge-platform-support] for more
+information on Rust's tiered platform support.
+
+Libraries
+---------
+- [`Vec::new` and `String::new` are now `const` functions.][64028]
+- [`LinkedList::new` is now a `const` function.][63684]
+- [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
+- [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
+ now `const`.][63786]
+
+Stabilized APIs
+---------------
+- [`Pin::into_inner`]
+- [`Instant::checked_duration_since`]
+- [`Instant::saturating_duration_since`]
+
+Cargo
+-----
+- [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
+- [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
+ `--all` is now deprecated.
+
+Misc
+----
+- [You can now pass `-Clinker` to rustdoc to control the linker used
+ for compiling doctests.][63834]
+
+Compatibility Notes
+-------------------
+- [Code that was previously accepted by the old borrow checker, but rejected by
+ the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
+ previously a warning, and will also become a hard error in the Rust 2015
+ edition in the 1.40.0 release.
+- [`rustdoc` now requires `rustc` to be installed and in the same directory to
+ run tests.][63827] This should improve performance when running a large
+ amount of doctests.
+- [The `try!` macro will now issue a deprecation warning.][62672] It is
+ recommended to use the `?` operator instead.
+- [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
+ returned `0.0`.
+
+[62600]: https://github.com/rust-lang/rust/pull/62600/
+[62672]: https://github.com/rust-lang/rust/pull/62672/
+[63118]: https://github.com/rust-lang/rust/pull/63118/
+[63209]: https://github.com/rust-lang/rust/pull/63209/
+[63402]: https://github.com/rust-lang/rust/pull/63402/
+[63565]: https://github.com/rust-lang/rust/pull/63565/
+[63595]: https://github.com/rust-lang/rust/pull/63595/
+[63684]: https://github.com/rust-lang/rust/pull/63684/
+[63698]: https://github.com/rust-lang/rust/pull/63698/
+[63770]: https://github.com/rust-lang/rust/pull/63770/
+[63786]: https://github.com/rust-lang/rust/pull/63786/
+[63827]: https://github.com/rust-lang/rust/pull/63827/
+[63834]: https://github.com/rust-lang/rust/pull/63834/
+[63927]: https://github.com/rust-lang/rust/pull/63927/
+[63933]: https://github.com/rust-lang/rust/pull/63933/
+[63934]: https://github.com/rust-lang/rust/pull/63934/
+[63938]: https://github.com/rust-lang/rust/pull/63938/
+[63940]: https://github.com/rust-lang/rust/pull/63940/
+[63941]: https://github.com/rust-lang/rust/pull/63941/
+[63945]: https://github.com/rust-lang/rust/pull/63945/
+[64010]: https://github.com/rust-lang/rust/pull/64010/
+[64028]: https://github.com/rust-lang/rust/pull/64028/
+[64334]: https://github.com/rust-lang/rust/pull/64334/
+[cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
+[cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
+[cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
+[`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
+[`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
+[`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
+
Version 1.38.0 (2019-09-26)
==========================
---------------
* [`std::panic`]
-* [`std::panic::catch_unwind`][] (renamed from `recover`)
-* [`std::panic::resume_unwind`][] (renamed from `propagate`)
-* [`std::panic::AssertUnwindSafe`][] (renamed from `AssertRecoverSafe`)
-* [`std::panic::UnwindSafe`][] (renamed from `RecoverSafe`)
+* [`std::panic::catch_unwind`] (renamed from `recover`)
+* [`std::panic::resume_unwind`] (renamed from `propagate`)
+* [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
+* [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
* [`str::is_char_boundary`]
* [`<*const T>::as_ref`]
* [`<*mut T>::as_ref`]
---------
* Stabilized APIs:
- * [`str::encode_utf16`][] (renamed from `utf16_units`)
- * [`str::EncodeUtf16`][] (renamed from `Utf16Units`)
+ * [`str::encode_utf16`] (renamed from `utf16_units`)
+ * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
* [`Ref::map`]
* [`RefMut::map`]
* [`ptr::drop_in_place`]
* [`time::Instant`]
* [`time::SystemTime`]
* [`Instant::now`]
- * [`Instant::duration_since`][] (renamed from `duration_from_earlier`)
+ * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
* [`Instant::elapsed`]
* [`SystemTime::now`]
- * [`SystemTime::duration_since`][] (renamed from `duration_from_earlier`)
+ * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
* [`SystemTime::elapsed`]
* Various `Add`/`Sub` impls for `Time` and `SystemTime`
* [`SystemTimeError`]
* Stabilized APIs
* `Path`
- * [`Path::strip_prefix`][] (renamed from relative_from)
- * [`path::StripPrefixError`][] (new error type returned from strip_prefix)
+ * [`Path::strip_prefix`] (renamed from relative_from)
+ * [`path::StripPrefixError`] (new error type returned from strip_prefix)
* `Ipv4Addr`
* [`Ipv4Addr::is_loopback`]
* [`Ipv4Addr::is_private`]
* Stabilized APIs:
[`Read::read_exact`],
- [`ErrorKind::UnexpectedEof`][] (renamed from `UnexpectedEOF`),
+ [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
[`fs::DirBuilder`], [`fs::DirBuilder::new`],
[`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
[`os::unix::fs::DirBuilderExt`],
[`collections::hash_set::HashSet::drain`],
[`collections::binary_heap::Drain`],
[`collections::binary_heap::BinaryHeap::drain`],
- [`Vec::extend_from_slice`][] (renamed from `push_all`),
+ [`Vec::extend_from_slice`] (renamed from `push_all`),
[`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
[`RwLock::into_inner`],
- [`Iterator::min_by_key`][] (renamed from `min_by`),
- [`Iterator::max_by_key`][] (renamed from `max_by`).
+ [`Iterator::min_by_key`] (renamed from `min_by`),
+ [`Iterator::max_by_key`] (renamed from `max_by`).
* The [core library][1.6co] is stable, as are most of its APIs.
* [The `assert_eq!` macro supports arguments that don't implement
`Sized`][1.6ae], such as arrays. In this way it behaves more like
* extra: Implementation of fixed output size variations of SHA-2.
* Tooling
- * `unused_variable` lint mode for unused variables (default: warn).
+ * `unused_variables` lint mode for unused variables (default: warn).
* `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
(default: warn).
* `unused_mut` lint mode for identifying unused `mut` qualifiers
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