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Update RELEASES.md for 1.44.0
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Erin Power
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RELEASES.md
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RELEASES.md
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Version 1.44.0 (2020-06-04)
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==========================
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Language
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--------
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- [You can now use `async/.await` with `#[no_std]` enabled.][69033]
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- [Added the `unused_braces` lint.][70081]
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**Syntax-only changes**
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- [Expansion-driven outline module parsing][69838]
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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 conditional compilation.
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Compiler
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--------
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- [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
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Additionally when incremental mode rustc defaults to 256 codegen units.
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- [Added tier 3\* support for the `aarch64-unknown-none` and
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`aarch64-unknown-none-softfloat` targets.][68334]
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- [Refactored `catch_unwind`, to have zero-cost unless unwinding is enabled and
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a panic is thrown.][67502]
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Libraries
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---------
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- [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
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`vec![]` to be able to be used in `const` contexts.
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- [`convert::Infallible` now implements `Hash`.][70281]
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- [`OsString` now implements `DerefMut` and `IndexMut` returning
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a `&mut OsStr`.][70048]
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- [Unicode 13 is now supported.][69929]
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- [`String` now implements `From<&mut str>`.][69661]
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- [`IoSlice` now implements `Copy`.][69403]
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- [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is less than 32.
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Stabilized APIs
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---------------
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- [`PathBuf::with_capacity`]
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- [`PathBuf::capacity`]
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- [`PathBuf::clear`]
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- [`PathBuf::reserve`]
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- [`PathBuf::reserve_exact`]
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- [`PathBuf::shrink_to_fit`]
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- [`f32::to_int_unchecked`]
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- [`f64::to_int_unchecked`]
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- [`Layout::align_to`]
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- [`Layout::pad_to_align`]
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- [`Layout::array`]
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Cargo
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-----
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- [Added the `cargo tree` command which will print a tree graph of
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your dependencies.][cargo/8062] E.g.
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```
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mdbook v0.3.2 (/Users/src/rust/mdbook)
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├── ammonia v3.0.0
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│ ├── html5ever v0.24.0
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│ │ ├── log v0.4.8
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│ │ │ └── cfg-if v0.1.9
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│ │ ├── mac v0.1.1
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│ │ └── markup5ever v0.9.0
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│ │ ├── log v0.4.8 (*)
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│ │ ├── phf v0.7.24
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│ │ │ └── phf_shared v0.7.24
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│ │ │ ├── siphasher v0.2.3
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│ │ │ └── unicase v1.4.2
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│ │ │ [build-dependencies]
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│ │ │ └── version_check v0.1.5
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...
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```
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Misc
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----
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- [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
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the version in the sidebar.][69494]
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Compatibility Notes
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-------------------
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- [Rustc now correctly generates static libraries on Windows GNU targets with
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the `.a` extension, rather than the previous `.lib`.][70937]
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- [Removed the `-C no_integrated_as` flag from rustc.][70345]
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- [The `file_name` property in JSON output of macro errors now points the actual
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source file rather than the previous format of `<NAME macros>`.][70969]
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**Note:** this may not point a file that actually exists on the user's system.
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- [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
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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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- [dep_graph Avoid allocating a set on when the number reads are small.][69778]
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- [Replace big JS dict with JSON parsing.][71250]
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[71147]: https://github.com/rust-lang/rust/pull/71147/
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[71250]: https://github.com/rust-lang/rust/pull/71250/
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[70937]: https://github.com/rust-lang/rust/pull/70937/
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[70969]: https://github.com/rust-lang/rust/pull/70969/
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[70632]: https://github.com/rust-lang/rust/pull/70632/
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[70281]: https://github.com/rust-lang/rust/pull/70281/
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[70345]: https://github.com/rust-lang/rust/pull/70345/
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[70048]: https://github.com/rust-lang/rust/pull/70048/
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[70081]: https://github.com/rust-lang/rust/pull/70081/
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[70156]: https://github.com/rust-lang/rust/pull/70156/
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[69838]: https://github.com/rust-lang/rust/pull/69838/
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[69929]: https://github.com/rust-lang/rust/pull/69929/
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[69661]: https://github.com/rust-lang/rust/pull/69661/
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[69778]: https://github.com/rust-lang/rust/pull/69778/
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[69494]: https://github.com/rust-lang/rust/pull/69494/
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[69403]: https://github.com/rust-lang/rust/pull/69403/
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[69033]: https://github.com/rust-lang/rust/pull/69033/
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[68692]: https://github.com/rust-lang/rust/pull/68692/
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[68334]: https://github.com/rust-lang/rust/pull/68334/
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[67502]: https://github.com/rust-lang/rust/pull/67502/
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[cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
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[`PathBuf::with_capacity`]: https://doc.rust-lang.org/beta/std/path/struct.PathBuf.html#method.with_capacity
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[`PathBuf::capacity`]: https://doc.rust-lang.org/beta/std/path/struct.PathBuf.html#method.capacity
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[`PathBuf::clear`]: https://doc.rust-lang.org/beta/std/path/struct.PathBuf.html#method.clear
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[`PathBuf::reserve`]: https://doc.rust-lang.org/beta/std/path/struct.PathBuf.html#method.reserve
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[`PathBuf::reserve_exact`]: https://doc.rust-lang.org/beta/std/path/struct.PathBuf.html#method.reserve_exact
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[`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/beta/std/path/struct.PathBuf.html#method.shrink_to_fit
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[`f32::to_int_unchecked`]: https://doc.rust-lang.org/beta/std/primitive.f32.html#method.to_int_unchecked
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[`f64::to_int_unchecked`]: https://doc.rust-lang.org/beta/std/primitive.f64.html#method.to_int_unchecked
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[`Layout::align_to`]: https://doc.rust-lang.org/beta/std/alloc/struct.Layout.html#method.align_to
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[`Layout::pad_to_align`]: https://doc.rust-lang.org/beta/std/alloc/struct.Layout.html#method.pad_to_align
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[`Layout::array`]: https://doc.rust-lang.org/beta/std/alloc/struct.Layout.html#method.array
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Version 1.43.1 (2020-05-07)
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===========================
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