Auto merge of #43627 - Aaronepower:master, r=alexcrichton
Updated release notes for 1.20 [Rendered](https://github.com/Aaronepower/rust/blob/master/RELEASES.md)
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RELEASES.md
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RELEASES.md
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Version 1.20.0 (2017-08-31)
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===========================
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Language
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--------
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- [Associated constants in traits is now stabilised.][42809]
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- [A lot of macro bugs are now fixed.][42913]
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Compiler
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--------
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- [Struct fields are now properly coerced to the expected field type.][42807]
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- [Enabled wasm LLVM backend][42571] WASM can now be built with the
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`wasm32-experimental-emscripten` target.
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- [Changed some of the error messages to be more helpful.][42033]
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- [Add support for RELRO(RELocation Read-Only) for platforms that support
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it.][43170]
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- [rustc now reports the total number of errors on compilation failure][43015]
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previously this was only the number of errors in the pass that failed.
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- [Expansion in rustc has been sped up 29x.][42533]
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- [added `msp430-none-elf` target.][43099]
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- [rustc will now suggest one-argument enum variant to fix type mismatch when
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applicable][43178]
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- [Fixes backtraces on Redox][43228]
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- [rustc now identifies different versions of same crate when absolute paths of
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different types match in an error message.][42826]
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Libraries
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---------
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- [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
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- [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
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tuples.][43011]
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- [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
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`RwLockReadGuard`, `RwLockWriteGuard`][42822]
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- [Impl `Clone` for `DefaultHasher`.][42799]
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- [Impl `Sync` for `SyncSender`.][42397]
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- [Impl `FromStr` for `char`][42271]
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- [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
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NaN.][42431]
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- [allow messages in the `unimplemented!()` macro.][42155]
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ie. `unimplemented!("Waiting for 1.21 to be stable")`
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- [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
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- [Upgrade to Unicode 10.0.0][42999]
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- [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
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- [Skip the main thread's manual stack guard on Linux][43072]
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- [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
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- [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
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previously 2^15.
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- [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
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Stabilized APIs
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---------------
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- [`CStr::into_c_string`]
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- [`CString::as_c_str`]
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- [`CString::into_boxed_c_str`]
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- [`Chain::get_mut`]
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- [`Chain::get_ref`]
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- [`Chain::into_inner`]
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- [`Option::get_or_insert_with`]
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- [`Option::get_or_insert`]
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- [`OsStr::into_os_string`]
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- [`OsString::into_boxed_os_str`]
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- [`Take::get_mut`]
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- [`Take::get_ref`]
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- [`Utf8Error::error_len`]
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- [`char::EscapeDebug`]
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- [`char::escape_debug`]
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- [`compile_error!`]
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- [`f32::from_bits`]
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- [`f32::to_bits`]
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- [`f64::from_bits`]
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- [`f64::to_bits`]
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- [`mem::ManuallyDrop`]
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- [`slice::sort_unstable_by_key`]
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- [`slice::sort_unstable_by`]
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- [`slice::sort_unstable`]
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- [`ste::from_boxed_utf8_unchecked`]
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- [`str::as_bytes_mut`]
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- [`str::as_bytes_mut`]
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- [`str::from_utf8_mut`]
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- [`str::from_utf8_unchecked_mut`]
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- [`str::get_mut`]
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- [`str::get_unchecked_mut`]
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- [`str::get_unchecked`]
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- [`str::get`]
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- [`str::into_boxed_bytes`]
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Cargo
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-----
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- [Cargo API token location moved from `~/.cargo/config` to
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`~/cargo/credentials`.][cargo/3978]
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- [Cargo will now build `main.rs` binaries that are in sub-directories of
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`src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
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`src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
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- [You can now specify version of a binary when installed through
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`cargo install` using `--vers`.][cargo/4229]
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- [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
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failure.][cargo/4248]
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- [Changed the convention around which file is the crate root.][cargo/4259]
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- [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
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instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
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Compatibility Notes
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-------------------
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- [Functions with `'static` in their return types will now not be as usable as
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if they were using lifetime parameters instead.][42417]
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- [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
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takes the sign of NaN into account where previously didn't.][42430]
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[42033]: https://github.com/rust-lang/rust/pull/42033
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[42155]: https://github.com/rust-lang/rust/pull/42155
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[42271]: https://github.com/rust-lang/rust/pull/42271
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[42397]: https://github.com/rust-lang/rust/pull/42397
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[42417]: https://github.com/rust-lang/rust/pull/42417
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[42430]: https://github.com/rust-lang/rust/pull/42430
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[42431]: https://github.com/rust-lang/rust/pull/42431
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[42533]: https://github.com/rust-lang/rust/pull/42533
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[42571]: https://github.com/rust-lang/rust/pull/42571
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[42613]: https://github.com/rust-lang/rust/pull/42613
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[42799]: https://github.com/rust-lang/rust/pull/42799
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[42807]: https://github.com/rust-lang/rust/pull/42807
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[42809]: https://github.com/rust-lang/rust/pull/42809
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[42822]: https://github.com/rust-lang/rust/pull/42822
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[42826]: https://github.com/rust-lang/rust/pull/42826
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[42854]: https://github.com/rust-lang/rust/pull/42854
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[42913]: https://github.com/rust-lang/rust/pull/42913
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[42999]: https://github.com/rust-lang/rust/pull/42999
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[43011]: https://github.com/rust-lang/rust/pull/43011
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[43015]: https://github.com/rust-lang/rust/pull/43015
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[43072]: https://github.com/rust-lang/rust/pull/43072
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[43077]: https://github.com/rust-lang/rust/pull/43077
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[43097]: https://github.com/rust-lang/rust/pull/43097
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[43099]: https://github.com/rust-lang/rust/pull/43099
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[43170]: https://github.com/rust-lang/rust/pull/43170
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[43178]: https://github.com/rust-lang/rust/pull/43178
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[43185]: https://github.com/rust-lang/rust/pull/43185
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[43228]: https://github.com/rust-lang/rust/pull/43228
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[cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
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[cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
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[cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
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[cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
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[cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
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[cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
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[`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
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[`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
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[`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
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[`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
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[`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
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[`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
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[`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
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[`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
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[`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
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[`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
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[`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
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[`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
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[`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
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[`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
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[`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
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[`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
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[`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
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[`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
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[`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
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[`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
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[`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
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[`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
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[`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
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[`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
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[`ste::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
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[`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
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[`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
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[`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
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[`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
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[`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
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[`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
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[`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
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[`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
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[`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
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Version 1.19.0 (2017-07-20)
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===========================
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@ -1679,7 +1863,7 @@ Tooling
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* [Test binaries now support a `--test-threads` argument to specify the number
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of threads used to run tests, and which acts the same as the
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`RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
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`RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
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* [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
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* [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
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* [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
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