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std: Stabilize fixed-width integer atomics #57425

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merged 1 commit into from Jan 26, 2019

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commented Jan 7, 2019

This commit stabilizes the Atomic{I,U}{8,16,32,64} APIs in the
std::sync::atomic and core::sync::atomic modules. Proposed in #56753
and tracked in #32976 this feature has been unstable for quite some time
and is hopefully ready to go over the finish line now!

The API is being stabilized as-is. The API of AtomicU8 and friends
mirrors that of AtomicUsize. A list of changes made here are:

  • A portability documentation section has been added to describe the
    current state of affairs.
  • Emulation of smaller-size atomics with larger-size atomics has been
    documented.
  • As an added bonus, ATOMIC_*_INIT is now scheduled for deprecation
    across the board in 1.34.0 now that const functions can be invoked
    in statics.

Note that the 128-bit atomic types are omitted from this stabilization
explicitly. They have far less platform support than the other atomic
types, and will likely require further discussion about their best
location.

Closes #32976
Closes #56753

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commented Jan 7, 2019

Note that this is currently still blocked on the FCP in #56753, so this shouldn't be approved until that FCP has finished.

@alexcrichton alexcrichton force-pushed the alexcrichton:stabilize-atomics branch from 9ec879f to 626a6a8 Jan 8, 2019

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commented Jan 8, 2019

r? @sfackler

(for eventual stabilization)

@rust-lang rust-lang deleted a comment from rust-highfive Jan 9, 2019

@Centril Centril added the relnotes label Jan 9, 2019

Show resolved Hide resolved src/libcore/sync/atomic.rs Outdated

@Centril Centril added the T-libs label Jan 10, 2019

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commented Jan 25, 2019

Ping from triage @alexcrichton and @sfackler :)

std: Stabilize fixed-width integer atomics
This commit stabilizes the `Atomic{I,U}{8,16,32,64}` APIs in the
`std::sync::atomic` and `core::sync::atomic` modules. Proposed in #56753
and tracked in #32976 this feature has been unstable for quite some time
and is hopefully ready to go over the finish line now!

The API is being stabilized as-is. The API of `AtomicU8` and friends
mirrors that of `AtomicUsize`. A list of changes made here are:

* A portability documentation section has been added to describe the
  current state of affairs.
* Emulation of smaller-size atomics with larger-size atomics has been
  documented.
* As an added bonus, `ATOMIC_*_INIT` is now scheduled for deprecation
  across the board in 1.34.0 now that `const` functions can be invoked
  in statics.

Note that the 128-bit atomic types are omitted from this stabilization
explicitly. They have far less platform support than the other atomic
types, and will likely require further discussion about their best
location.

Closes #32976
Closes #56753

@alexcrichton alexcrichton force-pushed the alexcrichton:stabilize-atomics branch from 626a6a8 to 14b36fb Jan 25, 2019

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commented Jan 25, 2019

Oops, thanks for the ping!

@bors: r=sfackler

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commented Jan 25, 2019

📌 Commit 14b36fb has been approved by sfackler

Centril added a commit to Centril/rust that referenced this pull request Jan 26, 2019

Rollup merge of rust-lang#57425 - alexcrichton:stabilize-atomics, r=s…
…fackler

std: Stabilize fixed-width integer atomics

This commit stabilizes the `Atomic{I,U}{8,16,32,64}` APIs in the
`std::sync::atomic` and `core::sync::atomic` modules. Proposed in rust-lang#56753
and tracked in rust-lang#32976 this feature has been unstable for quite some time
and is hopefully ready to go over the finish line now!

The API is being stabilized as-is. The API of `AtomicU8` and friends
mirrors that of `AtomicUsize`. A list of changes made here are:

* A portability documentation section has been added to describe the
  current state of affairs.
* Emulation of smaller-size atomics with larger-size atomics has been
  documented.
* As an added bonus, `ATOMIC_*_INIT` is now scheduled for deprecation
  across the board in 1.34.0 now that `const` functions can be invoked
  in statics.

Note that the 128-bit atomic types are omitted from this stabilization
explicitly. They have far less platform support than the other atomic
types, and will likely require further discussion about their best
location.

Closes rust-lang#32976
Closes rust-lang#56753

Centril added a commit to Centril/rust that referenced this pull request Jan 26, 2019

Rollup merge of rust-lang#57425 - alexcrichton:stabilize-atomics, r=s…
…fackler

std: Stabilize fixed-width integer atomics

This commit stabilizes the `Atomic{I,U}{8,16,32,64}` APIs in the
`std::sync::atomic` and `core::sync::atomic` modules. Proposed in rust-lang#56753
and tracked in rust-lang#32976 this feature has been unstable for quite some time
and is hopefully ready to go over the finish line now!

The API is being stabilized as-is. The API of `AtomicU8` and friends
mirrors that of `AtomicUsize`. A list of changes made here are:

* A portability documentation section has been added to describe the
  current state of affairs.
* Emulation of smaller-size atomics with larger-size atomics has been
  documented.
* As an added bonus, `ATOMIC_*_INIT` is now scheduled for deprecation
  across the board in 1.34.0 now that `const` functions can be invoked
  in statics.

Note that the 128-bit atomic types are omitted from this stabilization
explicitly. They have far less platform support than the other atomic
types, and will likely require further discussion about their best
location.

Closes rust-lang#32976
Closes rust-lang#56753

bors added a commit that referenced this pull request Jan 26, 2019

Auto merge of #57912 - Centril:rollup, r=Centril
Rollup of 9 pull requests

Successful merges:

 - #57425 (std: Stabilize fixed-width integer atomics)
 - #57703 (Make MutexGuard's Debug implementation more useful.)
 - #57729 (extra testing of how NLL handles wildcard type `_`)
 - #57764 (Fix some minor warnings)
 - #57825 (un-deprecate mem::zeroed)
 - #57827 (Ignore aarch64 in simd-intrinsic-generic-reduction)
 - #57852 (Suggest removing leading left angle brackets.)
 - #57882 (overhaul unused doc comments lint)
 - #57908 (resolve: Fix span arithmetics in the import conflict error)

Failed merges:

r? @ghost
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commented Jan 26, 2019

⌛️ Testing commit 14b36fb with merge f95834b...

bors added a commit that referenced this pull request Jan 26, 2019

Auto merge of #57425 - alexcrichton:stabilize-atomics, r=sfackler
std: Stabilize fixed-width integer atomics

This commit stabilizes the `Atomic{I,U}{8,16,32,64}` APIs in the
`std::sync::atomic` and `core::sync::atomic` modules. Proposed in #56753
and tracked in #32976 this feature has been unstable for quite some time
and is hopefully ready to go over the finish line now!

The API is being stabilized as-is. The API of `AtomicU8` and friends
mirrors that of `AtomicUsize`. A list of changes made here are:

* A portability documentation section has been added to describe the
  current state of affairs.
* Emulation of smaller-size atomics with larger-size atomics has been
  documented.
* As an added bonus, `ATOMIC_*_INIT` is now scheduled for deprecation
  across the board in 1.34.0 now that `const` functions can be invoked
  in statics.

Note that the 128-bit atomic types are omitted from this stabilization
explicitly. They have far less platform support than the other atomic
types, and will likely require further discussion about their best
location.

Closes #32976
Closes #56753
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commented Jan 26, 2019

☀️ Test successful - checks-travis, status-appveyor
Approved by: sfackler
Pushing f95834b to master...

@bors bors merged commit 14b36fb into rust-lang:master Jan 26, 2019

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bors added a commit that referenced this pull request Feb 21, 2019

Auto merge of #58616 - vertexclique:destabilize-fixed-width-atomic-in…
…tegers, r=dtolnay

Destabilize fixed-width const defined atomic integers

With this PR version 1.34.0 onwards const declarations of atomic integers will be unstable.

* Closes #58089
* Reverts partially: #57425

bors added a commit that referenced this pull request Feb 21, 2019

Auto merge of #58616 - vertexclique:destabilize-fixed-width-atomic-in…
…tegers, r=dtolnay

Destabilize fixed-width const defined atomic integers

With this PR version 1.34.0 onwards const declarations of atomic integers will be unstable.

* Closes #58089
* Reverts partially: #57425

bors added a commit that referenced this pull request Feb 22, 2019

Auto merge of #58616 - vertexclique:destabilize-fixed-width-atomic-in…
…tegers, r=dtolnay

Destabilize fixed-width const defined atomic integers

With this PR version 1.34.0 onwards const declarations of atomic integers will be unstable.

* Closes #58089
* Reverts partially: #57425

@Havvy Havvy referenced this pull request Mar 3, 2019

Merged

Remove target_has_atomic. #529

@alexcrichton alexcrichton deleted the alexcrichton:stabilize-atomics branch Mar 12, 2019

SSheldon added a commit to SSheldon/rust-objc that referenced this pull request Mar 25, 2019

Allow deprecations in macros so we don't give everyone warnings
The deprecations will be fixed later by raising the minimum supported
Rust version for this crate. These deprecations take effect in Rust 1.34
and were enabled in rust-lang/rust#57425.

netbsd-srcmastr pushed a commit to NetBSD/pkgsrc that referenced this pull request Apr 14, 2019

he
Update rust to version 1.34.0.
Pkgsrc changes:
 * Bump required rust version to build to 1.33.0.
 * Adapt patches to changed file locations.
 * (I worry about 32-bit ports, now that Atomic64 apparently is First-Class;
   this has been built on NetBSD/amd64 so far)

Upstream changes:

Version 1.34.0 (2019-04-11)
==========================

Language
--------
- [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
  `#[deprecated(note = "reason")]`. This was previously allowed by mistake
  but had no effect.
- [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
  `#[attr{}]` procedural macros.][57367]
- [You can now write `extern crate self as foo;`][57407] to import your
  crate's root into the extern prelude.


Compiler
--------
- [You can now target `riscv64imac-unknown-none-elf` and
  `riscv64gc-unknown-none-elf`.][58406]
- [You can now enable linker plugin LTO optimisations with
  `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
  into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
  boundaries.
- [You can now target `powerpc64-unknown-freebsd`.][57809]


Libraries
---------
- [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
  `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
  the `Hash` trait to create an iterator.
- [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
  methods.][58421] Most notably you no longer require the `Ord` trait to create
  an iterator.
- [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
  for all numeric types.][58044]
- [Indexing a `str` is now generic over all types that
  implement `SliceIndex<str>`.][57604]
- [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
  `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
  produce a warning if their returning type is unused.
- [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
  `overflowing_pow` are now available for all numeric types.][57873] These are
  equivalvent to methods such as `wrapping_add` for the `pow` operation.


Stabilized APIs
---------------

#### std & core
* [`Any::type_id`]
* [`Error::type_id`]
* [`atomic::AtomicI16`]
* [`atomic::AtomicI32`]
* [`atomic::AtomicI64`]
* [`atomic::AtomicI8`]
* [`atomic::AtomicU16`]
* [`atomic::AtomicU32`]
* [`atomic::AtomicU64`]
* [`atomic::AtomicU8`]
* [`convert::Infallible`]
* [`convert::TryFrom`]
* [`convert::TryInto`]
* [`iter::from_fn`]
* [`iter::successors`]
* [`num::NonZeroI128`]
* [`num::NonZeroI16`]
* [`num::NonZeroI32`]
* [`num::NonZeroI64`]
* [`num::NonZeroI8`]
* [`num::NonZeroIsize`]
* [`slice::sort_by_cached_key`]
* [`str::escape_debug`]
* [`str::escape_default`]
* [`str::escape_unicode`]
* [`str::split_ascii_whitespace`]

#### std
* [`Instant::checked_add`]
* [`Instant::checked_sub`]
* [`SystemTime::checked_add`]
* [`SystemTime::checked_sub`]

Cargo
-----
- [You can now use alternative registries to crates.io.][cargo/6654]

Misc
----
- [You can now use the `?` operator in your documentation tests without manually
  adding `fn main() -> Result<(), _> {}`.][56470]

Compatibility Notes
-------------------
- [`Command::before_exec` is now deprecated in favor of the
  unsafe method `Command::pre_exec`.][58059]
- [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated.][57425] As you
  can now use `const` functions in `static` variables.

[58370]: rust-lang/rust#58370
[58406]: rust-lang/rust#58406
[58421]: rust-lang/rust#58421
[58166]: rust-lang/rust#58166
[58044]: rust-lang/rust#58044
[58057]: rust-lang/rust#58057
[58059]: rust-lang/rust#58059
[57809]: rust-lang/rust#57809
[57873]: rust-lang/rust#57873
[57604]: rust-lang/rust#57604
[57367]: rust-lang/rust#57367
[57407]: rust-lang/rust#57407
[57425]: rust-lang/rust#57425
[57106]: rust-lang/rust#57106
[56470]: rust-lang/rust#56470
[cargo/6654]: rust-lang/cargo#6654
[`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
[`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#tymethod.type_id
[`atomic::AtomicI16`]: https://doc.rust-lang.org/std/atomic/struct.AtomicI16.html
[`atomic::AtomicI32`]: https://doc.rust-lang.org/std/atomic/struct.AtomicI32.html
[`atomic::AtomicI64`]: https://doc.rust-lang.org/std/atomic/struct.AtomicI64.html
[`atomic::AtomicI8`]: https://doc.rust-lang.org/std/atomic/struct.AtomicI8.html
[`atomic::AtomicU16`]: https://doc.rust-lang.org/std/atomic/struct.AtomicU16.html
[`atomic::AtomicU32`]: https://doc.rust-lang.org/std/atomic/struct.AtomicU32.html
[`atomic::AtomicU64`]: https://doc.rust-lang.org/std/atomic/struct.AtomicU64.html
[`atomic::AtomicU8`]: https://doc.rust-lang.org/std/atomic/struct.AtomicU8.html
[`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
[`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
[`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
[`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
[`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
[`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
[`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
[`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
[`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
[`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
[`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
[`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/slice/fn.sort_by_cached_key
[`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
[`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
[`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
[`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
[`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
[`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
[`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
[`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub

@Centril Centril added this to the 1.34 milestone Apr 26, 2019

netbsd-srcmastr pushed a commit to NetBSD/pkgsrc that referenced this pull request May 19, 2019

he
Update rust to version 1.34.0.
Pkgsrc changes:
 * Bump required rust version to build to 1.33.0.
 * Adapt patches to changed file locations.
 * (I worry about 32-bit ports, now that Atomic64 apparently is First-Class;
   this has been built on NetBSD/amd64 so far)

Upstream changes:

Version 1.34.0 (2019-04-11)
==========================

Language
--------
- [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
  `#[deprecated(note = "reason")]`. This was previously allowed by mistake
  but had no effect.
- [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
  `#[attr{}]` procedural macros.][57367]
- [You can now write `extern crate self as foo;`][57407] to import your
  crate's root into the extern prelude.


Compiler
--------
- [You can now target `riscv64imac-unknown-none-elf` and
  `riscv64gc-unknown-none-elf`.][58406]
- [You can now enable linker plugin LTO optimisations with
  `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
  into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
  boundaries.
- [You can now target `powerpc64-unknown-freebsd`.][57809]


Libraries
---------
- [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
  `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
  the `Hash` trait to create an iterator.
- [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
  methods.][58421] Most notably you no longer require the `Ord` trait to create
  an iterator.
- [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
  for all numeric types.][58044]
- [Indexing a `str` is now generic over all types that
  implement `SliceIndex<str>`.][57604]
- [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
  `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
  produce a warning if their returning type is unused.
- [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
  `overflowing_pow` are now available for all numeric types.][57873] These are
  equivalvent to methods such as `wrapping_add` for the `pow` operation.


Stabilized APIs
---------------

#### std & core
* [`Any::type_id`]
* [`Error::type_id`]
* [`atomic::AtomicI16`]
* [`atomic::AtomicI32`]
* [`atomic::AtomicI64`]
* [`atomic::AtomicI8`]
* [`atomic::AtomicU16`]
* [`atomic::AtomicU32`]
* [`atomic::AtomicU64`]
* [`atomic::AtomicU8`]
* [`convert::Infallible`]
* [`convert::TryFrom`]
* [`convert::TryInto`]
* [`iter::from_fn`]
* [`iter::successors`]
* [`num::NonZeroI128`]
* [`num::NonZeroI16`]
* [`num::NonZeroI32`]
* [`num::NonZeroI64`]
* [`num::NonZeroI8`]
* [`num::NonZeroIsize`]
* [`slice::sort_by_cached_key`]
* [`str::escape_debug`]
* [`str::escape_default`]
* [`str::escape_unicode`]
* [`str::split_ascii_whitespace`]

#### std
* [`Instant::checked_add`]
* [`Instant::checked_sub`]
* [`SystemTime::checked_add`]
* [`SystemTime::checked_sub`]

Cargo
-----
- [You can now use alternative registries to crates.io.][cargo/6654]

Misc
----
- [You can now use the `?` operator in your documentation tests without manually
  adding `fn main() -> Result<(), _> {}`.][56470]

Compatibility Notes
-------------------
- [`Command::before_exec` is now deprecated in favor of the
  unsafe method `Command::pre_exec`.][58059]
- [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated.][57425] As you
  can now use `const` functions in `static` variables.

[58370]: rust-lang/rust#58370
[58406]: rust-lang/rust#58406
[58421]: rust-lang/rust#58421
[58166]: rust-lang/rust#58166
[58044]: rust-lang/rust#58044
[58057]: rust-lang/rust#58057
[58059]: rust-lang/rust#58059
[57809]: rust-lang/rust#57809
[57873]: rust-lang/rust#57873
[57604]: rust-lang/rust#57604
[57367]: rust-lang/rust#57367
[57407]: rust-lang/rust#57407
[57425]: rust-lang/rust#57425
[57106]: rust-lang/rust#57106
[56470]: rust-lang/rust#56470
[cargo/6654]: rust-lang/cargo#6654
[`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
[`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#tymethod.type_id
[`atomic::AtomicI16`]: https://doc.rust-lang.org/std/atomic/struct.AtomicI16.html
[`atomic::AtomicI32`]: https://doc.rust-lang.org/std/atomic/struct.AtomicI32.html
[`atomic::AtomicI64`]: https://doc.rust-lang.org/std/atomic/struct.AtomicI64.html
[`atomic::AtomicI8`]: https://doc.rust-lang.org/std/atomic/struct.AtomicI8.html
[`atomic::AtomicU16`]: https://doc.rust-lang.org/std/atomic/struct.AtomicU16.html
[`atomic::AtomicU32`]: https://doc.rust-lang.org/std/atomic/struct.AtomicU32.html
[`atomic::AtomicU64`]: https://doc.rust-lang.org/std/atomic/struct.AtomicU64.html
[`atomic::AtomicU8`]: https://doc.rust-lang.org/std/atomic/struct.AtomicU8.html
[`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
[`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
[`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
[`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
[`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
[`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
[`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
[`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
[`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
[`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
[`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
[`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/slice/fn.sort_by_cached_key
[`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
[`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
[`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
[`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
[`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
[`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
[`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
[`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
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