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Update RELEASES.md for 1.53.0
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Erin Power
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RELEASES.md
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RELEASES.md
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Version 1.53.0 (2021-06-17)
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============================
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Language
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-----------------------
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- [You can now use unicode for identifiers.][83799] This allows multilingual
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identifiers but still doesn't allow glyphs that not considered characters
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such as `◆` or `🦀`. More specifically you can now use any identifier that
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matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
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is the same standard as languages like Python, however Rust uses NFC
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normalisation which may be different from other languages.
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- [You can now specify "or patterns" inside pattern matches.][79278]
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Previously you could only use `|` (OR) on complete patterns. E.g.
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```rust
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let x = Some(2u8);
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// Before
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matches!(x, Some(1) | Some(2));
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// Now
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matches!(x, Some(1 | 2));
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```
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- [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
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has the same semantics as the `:pat` matcher. This is to allow `:pat`
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to change semantics to being a pattern fragment in a future edition.
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Compiler
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-----------------------
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- [Updated to build with LLVM 12 by , and enabled `mutable-noalias` when
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built LLVM 12 or greater.][82834]
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- [Updated the minimum external LLVM version to LLVM 10.][83387]
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- [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
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- [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
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Libraries
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-----------------------
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- [Abort messages will now forward to `android_set_abort_message` on
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Android platforms when available.][81469]
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- [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
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- [Arrays of any length now implement `IntoIterator`.][84147]
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Currently `.into_iter()` will return `slice::Iter` (`Item=&T`), but
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this may change in a future edition to return `Item=T`.
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- [`NonZero<T>::{leading_zeros, trailing_zeros}` is now `const`.][84082]
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- [`{f32, f64}::from_str` now parse and print special values
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(`NaN`, `-0`) according to IEEE RFC 754.][78618]
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- [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
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- [Add the `BITS` associated constant to all numeric types.][82565]
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Stabilised APIs
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---------------
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- [`AtomicBool::fetch_update`]
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- [`AtomicPtr::fetch_update`]
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- [`BTreeMap::retain`]
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- [`BTreeSet::retain`]
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- [`BufReader::seek_relative`]
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- [`DebugStruct::non_exhaustive`]
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- [`Duration::MAX`]
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- [`Duration::ZERO`]
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- [`Duration::is_zero`]
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- [`Duration::saturating_add`]
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- [`Duration::saturating_mul`]
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- [`Duration::saturating_sub`]
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- [`ErrorKind::Unsupported`]
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- [`Option::insert`]
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- [`Ordering::is_eq`]
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- [`Ordering::is_ge`]
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- [`Ordering::is_gt`]
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- [`Ordering::is_le`]
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- [`Ordering::is_lt`]
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- [`Ordering::is_ne`]
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- [`OsStr::is_ascii`]
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- [`OsStr::make_ascii_lowercase`]
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- [`OsStr::make_ascii_uppercase`]
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- [`OsStr::to_ascii_lowercase`]
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- [`OsStr::to_ascii_uppercase`]
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- [`Peekable::peek_mut`]
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- [`Rc::decrement_strong_count`]
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- [`Rc::increment_strong_count`]
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- [`Vec::extend_from_within`]
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- [`array::from_mut`]
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- [`array::from_ref`]
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- [`char::MAX`]
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- [`char::REPLACEMENT_CHARACTER`]
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- [`char::UNICODE_VERSION`]
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- [`char::decode_utf16`]
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- [`char::from_digit`]
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- [`char::from_u32_unchecked`]
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- [`char::from_u32`]
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- [`cmp::max_by_key`]
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- [`cmp::max_by`]
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- [`cmp::min_by_key`]
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- [`cmp::min_by`]
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- [`f32::is_subnormal`]
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- [`f64::is_subnormal`]
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Cargo
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-----------------------
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- [Expose build.target .cargo/config setting as packages.target in Cargo.toml][cargo/9030]
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Rustdoc
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-----------------------
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- [Added the `rustdoc::bare_urls` lint that warns when you have URLs
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without hyperlinks.][81764]
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Compatibility Notes
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-------------------
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- [Implement token-based handling of attributes during expansion][82608]
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- [`Ipv4::from_str` will now reject octal format IP addresses.][83652] The octal format
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can lead confusion and potential security vulnerablities and is no longer recommended.
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Internal Only
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-------------
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- [Rework the `std::sys::windows::alloc` implementation.][83065]
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- [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
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- [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
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- [Rework rustdoc const type][82873]
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[83386]: https://github.com/rust-lang/rust/pull/83386
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[82771]: https://github.com/rust-lang/rust/pull/82771
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[84147]: https://github.com/rust-lang/rust/pull/84147
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[84082]: https://github.com/rust-lang/rust/pull/84082
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[83799]: https://github.com/rust-lang/rust/pull/83799
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[83681]: https://github.com/rust-lang/rust/pull/83681
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[83652]: https://github.com/rust-lang/rust/pull/83652
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[83387]: https://github.com/rust-lang/rust/pull/83387
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[82873]: https://github.com/rust-lang/rust/pull/82873
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[82864]: https://github.com/rust-lang/rust/pull/82864
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[82608]: https://github.com/rust-lang/rust/pull/82608
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[82565]: https://github.com/rust-lang/rust/pull/82565
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[80525]: https://github.com/rust-lang/rust/pull/80525
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[79278]: https://github.com/rust-lang/rust/pull/79278
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[78618]: https://github.com/rust-lang/rust/pull/78618
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[77704]: https://github.com/rust-lang/rust/pull/77704
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[83941]: https://github.com/rust-lang/rust/pull/83941
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[83065]: https://github.com/rust-lang/rust/pull/83065
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[82834]: https://github.com/rust-lang/rust/pull/82834
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[81764]: https://github.com/rust-lang/rust/pull/81764
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[81469]: https://github.com/rust-lang/rust/pull/81469
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[cargo/9030]: https://github.com/rust-lang/cargo/pull/9030
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[`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
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[`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
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[`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
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[`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
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[`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
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[`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
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[`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
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[`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
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[`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
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[`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
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[`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
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[`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
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[`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
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[`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
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[`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
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[`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
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[`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
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[`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
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[`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
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[`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
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[`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
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[`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
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[`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
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[`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
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[`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
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[`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
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[`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
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[`OsStr::eq_ignore_ascii_case`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.eq_ignore_ascii_case
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[`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
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[`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
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[`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
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[`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
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[`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
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[`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
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[`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
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[`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
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[`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
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[`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
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[`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
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[`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
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[`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
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[`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
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[`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
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[`f32::is_subnormal`]: https://doc.rust-lang.org/f32.html#method.is_subnormal
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[`f64::is_subnormal`]: https://doc.rust-lang.org/f64.html#method.is_subnormal
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Version 1.52.1 (2021-05-10)
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============================
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