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‎RELEASES.md

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Version 1.43.0 (2020-04-23)
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==========================
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Language
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--------
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- [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
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the type inferred correctly.][68129]
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- [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
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**Syntax only changes**
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- [Allow `type Foo: Ord` syntactically.][69361]
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- [Fuse associated and extern items up to defaultness.][69194]
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- [Syntactically allow `self` in all `fn` contexts.][68764]
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- [Merge `fn` syntax + cleanup item parsing.][68728]
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- [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
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For example, you may now write:
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```rust
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macro_rules! mac_trait {
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($i:item) => {
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trait T { $i }
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}
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}
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mac_trait! {
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fn foo() {}
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}
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```
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These are still rejected *semantically*, so you will likely receive an error but
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these changes can be seen and parsed by macros and
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conditional compilation.
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Compiler
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--------
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- [You can now pass multiple lint flags to rustc to override the previous
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flags.][67885] For example; `rustc -D unused -A unused-variables` denies
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everything in the `unused` lint group except `unused-variables` which
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is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
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everything in the `unused` lint group **including** `unused-variables` since
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the allow flag is specified before the deny flag (and therefore overridden).
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- [rustc will now prefer your system MinGW libraries over its bundled libraries
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if they are available on `windows-gnu`.][67429]
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- [rustc now buffers errors/warnings printed in JSON.][69227]
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Libraries
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---------
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- [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
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`TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
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respectively.][69538] **Note** These conversions are only available when `N`
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is `0..=32`.
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- [You can now use associated constants on floats and integers directly, rather
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than having to import the module.][68952] e.g. You can now write `u32::MAX` or
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`f32::NAN` with no imports.
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- [`u8::is_ascii` is now `const`.][68984]
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- [`String` now implements `AsMut<str>`.][68742]
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- [Added the `primitive` module to `std` and `core`.][67637] This module
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reexports Rust's primitive types. This is mainly useful in macros
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where you want avoid these types being shadowed.
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- [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
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- [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
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Stabilized APIs
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---------------
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- [`Once::is_completed`]
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- [`f32::LOG10_2`]
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- [`f32::LOG2_10`]
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- [`f64::LOG10_2`]
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- [`f64::LOG2_10`]
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- [`iter::once_with`]
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Cargo
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-----
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- [You can now set config `[profile]`s in your `.cargo/config`, or through
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your environment.][cargo/7823]
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- [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
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executable path when running integration tests or benchmarks.][cargo/7697]
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`<name>` is the name of your binary as-is e.g. If you wanted the executable
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path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
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Misc
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----
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- [Certain checks in the `const_err` lint were deemed unrelated to const
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evaluation][69185], and have been moved to the `unconditional_panic` and
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`arithmetic_overflow` lints.
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Compatibility Notes
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-------------------
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- [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
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has been a warning since 1.36.0.
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- [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
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led to some instances being accepted, and now correctly emits a hard error.
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[69340]: https://github.com/rust-lang/rust/pull/69340
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Internal Only
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-------------
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These changes provide no direct user facing benefits, but represent significant
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improvements to the internals and overall performance of `rustc` and
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related tools.
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- [All components are now built with `opt-level=3` instead of `2`.][67878]
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- [Improved how rustc generates drop code.][67332]
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- [Improved performance from `#[inline]`-ing certain hot functions.][69256]
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- [traits: preallocate 2 Vecs of known initial size][69022]
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- [Avoid exponential behaviour when relating types][68772]
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- [Skip `Drop` terminators for enum variants without drop glue][68943]
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- [Improve performance of coherence checks][68966]
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- [Deduplicate types in the generator witness][68672]
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- [Invert control in struct_lint_level.][68725]
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[67332]: https://github.com/rust-lang/rust/pull/67332/
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[67429]: https://github.com/rust-lang/rust/pull/67429/
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[67637]: https://github.com/rust-lang/rust/pull/67637/
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[67642]: https://github.com/rust-lang/rust/pull/67642/
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[67878]: https://github.com/rust-lang/rust/pull/67878/
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[67885]: https://github.com/rust-lang/rust/pull/67885/
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[68129]: https://github.com/rust-lang/rust/pull/68129/
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[68672]: https://github.com/rust-lang/rust/pull/68672/
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[68725]: https://github.com/rust-lang/rust/pull/68725/
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[68728]: https://github.com/rust-lang/rust/pull/68728/
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[68738]: https://github.com/rust-lang/rust/pull/68738/
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[68742]: https://github.com/rust-lang/rust/pull/68742/
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[68764]: https://github.com/rust-lang/rust/pull/68764/
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[68772]: https://github.com/rust-lang/rust/pull/68772/
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[68943]: https://github.com/rust-lang/rust/pull/68943/
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[68952]: https://github.com/rust-lang/rust/pull/68952/
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[68966]: https://github.com/rust-lang/rust/pull/68966/
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[68984]: https://github.com/rust-lang/rust/pull/68984/
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[69022]: https://github.com/rust-lang/rust/pull/69022/
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[69185]: https://github.com/rust-lang/rust/pull/69185/
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[69194]: https://github.com/rust-lang/rust/pull/69194/
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[69201]: https://github.com/rust-lang/rust/pull/69201/
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[69227]: https://github.com/rust-lang/rust/pull/69227/
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[69548]: https://github.com/rust-lang/rust/pull/69548/
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[69256]: https://github.com/rust-lang/rust/pull/69256/
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[69361]: https://github.com/rust-lang/rust/pull/69361/
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[69366]: https://github.com/rust-lang/rust/pull/69366/
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[69538]: https://github.com/rust-lang/rust/pull/69538/
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[cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
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[cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
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[`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
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[`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
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[`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
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[`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
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[`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
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[`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
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Version 1.42.0 (2020-03-12)
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==========================
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Language
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--------
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* [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
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* [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
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* [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
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* [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
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Language
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--------
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* [Allow `concat_idents!` in type positions as well as in expression
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positions](https://github.com/rust-lang/rust/pull/33735).
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* [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
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[RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
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* [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).

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