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Updated RELEASES.md for 1.32.0 [Rendered](https://github.com/Aaronepower/rust/blob/master/RELEASES.md) r? @Mark-Simulacrum cc @rust-lang/release
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‎RELEASES.md

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Version 1.32.0 (2019-01-17)
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==========================
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Language
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--------
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#### 2018 edition
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- [You can now use the `?` operator in macro definitions.][56245] The `?`
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operator allows you to specify zero or one repetitions similar to the `*` and
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`+` operators.
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- [Module paths with no leading keyword like `super`, `self`, or `crate`, will
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now always resolve to the item (`enum`, `struct`, etc.) available in the
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module if present, before resolving to a external crate or an item the prelude.][56759]
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E.g.
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```rust
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enum Color { Red, Green, Blue }
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use Color::*;
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```
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#### All editions
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- [You can now match against `PhantomData<T>` types.][55837]
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- [You can now match against literals in macros with the `literal`
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specifier.][56072] This will match against a literal of any type.
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E.g. `1`, `'A'`, `"Hello World"`
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- [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
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```rust
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struct Point(i32, i32);
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impl Point {
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pub fn new(x: i32, y: i32) -> Self {
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Self(x, y)
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}
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pub fn is_origin(&self) -> bool {
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match self {
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Self(0, 0) => true,
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_ => false,
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}
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}
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}
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```
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- [Self can also now be used in type definitions.][56366] E.g.
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```rust
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enum List<T>
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where
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Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
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{
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Nil,
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Cons(T, Box<Self>) // likewise here
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}
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```
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- [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
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a `impl Trait` or `dyn Trait` is returned and unused in the program.
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Compiler
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--------
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- [The default allocator has changed from jemalloc to the default allocator on
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your system.][55238] The compiler itself on Linux & macOS will still use
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jemalloc, but programs compiled with it will use the system allocator.
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- [Added the `aarch64-pc-windows-msvc` target.][55702]
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Libraries
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---------
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- [`PathBuf` now implements `FromStr`.][55148]
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- [`Box<[T]>` now implements `FromIterator<T>`.][55843]
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- [The `dbg!` macro has been stabilized.][56395] This macro enables you to
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easily debug expressions in your rust program. E.g.
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```rust
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let a = 2;
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let b = dbg!(a * 2) + 1;
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// ^-- prints: [src/main.rs:4] a * 2 = 4
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assert_eq!(b, 5);
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```
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The following APIs are now `const` functions and can be used in a
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`const` context.
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- [`Cell::as_ptr`]
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- [`UnsafeCell::get`]
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- [`char::is_ascii`]
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- [`iter::empty`]
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- [`ManuallyDrop::new`]
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- [`ManuallyDrop::into_inner`]
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- [`RangeInclusive::start`]
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- [`RangeInclusive::end`]
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- [`NonNull::as_ptr`]
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- [`slice::as_ptr`]
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- [`str::as_ptr`]
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- [`Duration::as_secs`]
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- [`Duration::subsec_millis`]
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- [`Duration::subsec_micros`]
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- [`Duration::subsec_nanos`]
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- [`CStr::as_ptr`]
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- [`Ipv4Addr::is_unspecified`]
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- [`Ipv6Addr::new`]
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- [`Ipv6Addr::octets`]
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Stabilized APIs
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---------------
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- [`i8::to_be_bytes`]
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- [`i8::to_le_bytes`]
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- [`i8::to_ne_bytes`]
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- [`i8::from_be_bytes`]
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- [`i8::from_le_bytes`]
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- [`i8::from_ne_bytes`]
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- [`i16::to_be_bytes`]
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- [`i16::to_le_bytes`]
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- [`i16::to_ne_bytes`]
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- [`i16::from_be_bytes`]
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- [`i16::from_le_bytes`]
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- [`i16::from_ne_bytes`]
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- [`i32::to_be_bytes`]
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- [`i32::to_le_bytes`]
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- [`i32::to_ne_bytes`]
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- [`i32::from_be_bytes`]
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- [`i32::from_le_bytes`]
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- [`i32::from_ne_bytes`]
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- [`i64::to_be_bytes`]
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- [`i64::to_le_bytes`]
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- [`i64::to_ne_bytes`]
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- [`i64::from_be_bytes`]
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- [`i64::from_le_bytes`]
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- [`i64::from_ne_bytes`]
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- [`isize::to_be_bytes`]
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- [`isize::to_le_bytes`]
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- [`isize::to_ne_bytes`]
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- [`isize::from_be_bytes`]
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- [`isize::from_le_bytes`]
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- [`isize::from_ne_bytes`]
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- [`u8::to_be_bytes`]
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- [`u8::to_le_bytes`]
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- [`u8::to_ne_bytes`]
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- [`u8::from_be_bytes`]
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- [`u8::from_le_bytes`]
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- [`u8::from_ne_bytes`]
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- [`u16::to_be_bytes`]
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- [`u16::to_le_bytes`]
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- [`u16::to_ne_bytes`]
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- [`u16::from_be_bytes`]
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- [`u16::from_le_bytes`]
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- [`u16::from_ne_bytes`]
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- [`u32::to_be_bytes`]
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- [`u32::to_le_bytes`]
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- [`u32::to_ne_bytes`]
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- [`u32::from_be_bytes`]
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- [`u32::from_le_bytes`]
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- [`u32::from_ne_bytes`]
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- [`u64::to_be_bytes`]
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- [`u64::to_le_bytes`]
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- [`u64::to_ne_bytes`]
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- [`u64::from_be_bytes`]
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- [`u64::from_le_bytes`]
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- [`u64::from_ne_bytes`]
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- [`usize::to_be_bytes`]
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- [`usize::to_le_bytes`]
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- [`usize::to_ne_bytes`]
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- [`usize::from_be_bytes`]
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- [`usize::from_le_bytes`]
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- [`usize::from_ne_bytes`]
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Cargo
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-----
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- [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
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- [Usernames are now allowed in alt registry URLs.][cargo/6242]
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Misc
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----
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- [`libproc_macro` has been added to the `rust-src` distribution.][55280]
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Compatibility Notes
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-------------------
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- [The argument types for AVX's
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`_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
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been changed from `*const` to `*mut` as the previous implementation
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was unsound.
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[55148]: https://github.com/rust-lang/rust/pull/55148/
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[55238]: https://github.com/rust-lang/rust/pull/55238/
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[55280]: https://github.com/rust-lang/rust/pull/55280/
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[55610]: https://github.com/rust-lang/rust/pull/55610/
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[55663]: https://github.com/rust-lang/rust/pull/55663/
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[55702]: https://github.com/rust-lang/rust/pull/55702/
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[55837]: https://github.com/rust-lang/rust/pull/55837/
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[55843]: https://github.com/rust-lang/rust/pull/55843/
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[56072]: https://github.com/rust-lang/rust/pull/56072/
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[56245]: https://github.com/rust-lang/rust/pull/56245/
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[56365]: https://github.com/rust-lang/rust/pull/56365/
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[56366]: https://github.com/rust-lang/rust/pull/56366/
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[56395]: https://github.com/rust-lang/rust/pull/56395/
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[56759]: https://github.com/rust-lang/rust/pull/56759/
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[cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
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[cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
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[`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
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[`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
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[`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
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[`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
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[`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
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[`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
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[`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
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[`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
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[`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
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[`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
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[`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
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[`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
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[`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
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[`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
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[`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
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[`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
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[`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
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[`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
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[`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
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[`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
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[`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
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[`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
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[`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
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[`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
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[`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
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[`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
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[`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
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[`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
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[`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
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[`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
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[`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
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[`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
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[`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
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[`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
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[`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
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[`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
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[`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
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[`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
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[`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
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[`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
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[`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
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[`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
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[`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
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[`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
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[`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
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[`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
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[`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
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[`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
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[`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
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[`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
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[`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
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[`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
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[`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
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[`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
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[`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
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[`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
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[`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
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[`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
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[`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
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[`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
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[`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
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[`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
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[`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
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[`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
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[`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
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[`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
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[`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
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[`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
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[`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
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[`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
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[`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
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[`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
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[`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
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[`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
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[`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
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[`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
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[`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
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[`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
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[`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
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Version 1.31.1 (2018-12-20)
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===========================
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