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Mark str::trim.* functions as #[must_use]. #57106

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merged 3 commits into from Jan 31, 2019

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commented Dec 24, 2018

The functions return a reference to a new object and do not modify in-place
as the following code shows:

let s = String::from("   hello   ");
s.trim();
assert_eq!(s, "   hello   ");

The new reference should be bound to a variable as now indicated by #[must_use].

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commented Dec 24, 2018

r? @cramertj

(rust_highfive has picked a reviewer for you, use r? to override)

Show resolved Hide resolved src/libcore/str/mod.rs Outdated
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commented Dec 24, 2018

Generalized discussion on where we want to do this is in #48926.

@matthiaskrgr matthiaskrgr force-pushed the matthiaskrgr:trim_must_use branch from eded81a to 01f76d3 Dec 25, 2018

@@ -3554,6 +3554,8 @@ impl str {
///
/// assert_eq!("Hello\tworld", s.trim());
/// ```
#[must_use = "this returns the trimmed string as a new allocation, \

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I'm pretty sure trim returns a slice into the existing string and therefore doesn't allocate? (Sorry my earlier comment wasn't clearer: I linked to the must_use reason on String.replace just as an example of the reason functionality being used. Consistent language style is desirable, but we don't want to reuse exact words when that would be inaccurate.)

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commented Dec 26, 2018

r? @sfackler
(libs team member who was following the original issue)

@rust-highfive rust-highfive assigned sfackler and unassigned cramertj Dec 26, 2018

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commented Dec 26, 2018

Yep, none of these return a new allocation, so the message here should be changed.

matthiaskrgr and others added some commits Dec 24, 2018

mark str::string::String.trim.* functions as #[must_use].
The functions return a reference to a new object and do not modify in-place
as the following code shows:
````
let s = String::from("   hello   ");
s.trim();
assert_eq!(s, "   hello   ");
````

The new reference should be bound to a variable as now indicated by #[must_use].
Update src/libcore/str/mod.rs, tweak must_use message
trimmed string is returned as a slice instead of a new allocation

Co-Authored-By: matthiaskrgr <matthias.krueger@famsik.de>

@matthiaskrgr matthiaskrgr force-pushed the matthiaskrgr:trim_must_use branch from aa74cfc to 74e9057 Dec 26, 2018

@kennytm kennytm added the relnotes label Dec 27, 2018

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

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commented Jan 12, 2019

Ping from triage, @sfackler :)

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commented Jan 29, 2019

Ping from triage @sfackler / @rust-lang/libs: This PR requires your review.

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commented Jan 29, 2019

Oops!

@bors r+ rollup

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commented Jan 29, 2019

📌 Commit 74e9057 has been approved by sfackler

Centril added a commit to Centril/rust that referenced this pull request Jan 30, 2019

Rollup merge of rust-lang#57106 - matthiaskrgr:trim_must_use, r=sfackler
mark str::string::String.trim.* functions as #[must_use].

The functions return a reference to a new object and do not modify in-place
as the following code shows:
````
let s = String::from("   hello   ");
s.trim();
assert_eq!(s, "   hello   ");
````

The new reference should be bound to a variable as now indicated by #[must_use].

bors added a commit that referenced this pull request Jan 30, 2019

Auto merge of #57982 - Centril:rollup, r=Centril
Rollup of 4 pull requests

Successful merges:

 - #57106 (mark str::string::String.trim.* functions as #[must_use].)
 - #57920 (use `SOURCE_DATE_EPOCH` for man page time if set)
 - #57934 (Introduce into_raw_non_null on Rc and Arc)
 - #57974 (override `VecDeque`'s `Iter::try_fold`)

Failed merges:

r? @ghost
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commented Jan 30, 2019

⌛️ Testing commit 74e9057 with merge 01da8fe...

bors added a commit that referenced this pull request Jan 30, 2019

Auto merge of #57106 - matthiaskrgr:trim_must_use, r=sfackler
mark str::string::String.trim.* functions as #[must_use].

The functions return a reference to a new object and do not modify in-place
as the following code shows:
````
let s = String::from("   hello   ");
s.trim();
assert_eq!(s, "   hello   ");
````

The new reference should be bound to a variable as now indicated by #[must_use].

@SimonSapin SimonSapin changed the title mark str::string::String.trim.* functions as #[must_use]. Mark str::trim.* functions as #[must_use]. Jan 30, 2019

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commented Jan 30, 2019

💔 Test failed - status-appveyor

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commented Jan 30, 2019

@bors retry

Centril added a commit to Centril/rust that referenced this pull request Jan 30, 2019

Rollup merge of rust-lang#57106 - matthiaskrgr:trim_must_use, r=sfackler
Mark str::trim.* functions as #[must_use].

The functions return a reference to a new object and do not modify in-place
as the following code shows:
````
let s = String::from("   hello   ");
s.trim();
assert_eq!(s, "   hello   ");
````

The new reference should be bound to a variable as now indicated by #[must_use].

Centril added a commit to Centril/rust that referenced this pull request Jan 30, 2019

Rollup merge of rust-lang#57106 - matthiaskrgr:trim_must_use, r=sfackler
Mark str::trim.* functions as #[must_use].

The functions return a reference to a new object and do not modify in-place
as the following code shows:
````
let s = String::from("   hello   ");
s.trim();
assert_eq!(s, "   hello   ");
````

The new reference should be bound to a variable as now indicated by #[must_use].

bors added a commit that referenced this pull request Jan 30, 2019

Auto merge of #57995 - Centril:rollup, r=Centril
Rollup of 6 pull requests

Successful merges:

 - #57008 (suggest `|` when `,` founds in invalid match value)
 - #57106 (Mark str::trim.* functions as #[must_use].)
 - #57920 (use `SOURCE_DATE_EPOCH` for man page time if set)
 - #57934 (Introduce into_raw_non_null on Rc and Arc)
 - #57971 (SGX target: improve panic & exit handling)
 - #57980 (Add the edition guide to the bookshelf)

Failed merges:

r? @ghost

Centril added a commit to Centril/rust that referenced this pull request Jan 30, 2019

Rollup merge of rust-lang#57106 - matthiaskrgr:trim_must_use, r=sfackler
Mark str::trim.* functions as #[must_use].

The functions return a reference to a new object and do not modify in-place
as the following code shows:
````
let s = String::from("   hello   ");
s.trim();
assert_eq!(s, "   hello   ");
````

The new reference should be bound to a variable as now indicated by #[must_use].

Centril added a commit to Centril/rust that referenced this pull request Jan 30, 2019

Rollup merge of rust-lang#57106 - matthiaskrgr:trim_must_use, r=sfackler
Mark str::trim.* functions as #[must_use].

The functions return a reference to a new object and do not modify in-place
as the following code shows:
````
let s = String::from("   hello   ");
s.trim();
assert_eq!(s, "   hello   ");
````

The new reference should be bound to a variable as now indicated by #[must_use].

bors added a commit that referenced this pull request Jan 30, 2019

Auto merge of #58014 - Centril:rollup, r=Centril
Rollup of 12 pull requests

Successful merges:

 - #57008 (suggest `|` when `,` founds in invalid match value)
 - #57106 (Mark str::trim.* functions as #[must_use].)
 - #57920 (use `SOURCE_DATE_EPOCH` for man page time if set)
 - #57934 (Introduce into_raw_non_null on Rc and Arc)
 - #57971 (SGX target: improve panic & exit handling)
 - #57980 (Add the edition guide to the bookshelf)
 - #57984 (Improve bug message in check_ty)
 - #57987 (Fix some AArch64 typos)
 - #57999 (Add MOVBE x86 CPU feature)
 - #58000 (Fixes and cleanups)
 - #58007 (Don't panic when accessing enum variant ctor using `Self` in match)
 - #58008 (Pass correct arguments to places_conflict)

Failed merges:

r? @ghost

Centril added a commit to Centril/rust that referenced this pull request Jan 31, 2019

Rollup merge of rust-lang#57106 - matthiaskrgr:trim_must_use, r=sfackler
Mark str::trim.* functions as #[must_use].

The functions return a reference to a new object and do not modify in-place
as the following code shows:
````
let s = String::from("   hello   ");
s.trim();
assert_eq!(s, "   hello   ");
````

The new reference should be bound to a variable as now indicated by #[must_use].

bors added a commit that referenced this pull request Jan 31, 2019

Auto merge of #58016 - Centril:rollup, r=Centril
Rollup of 12 pull requests

Successful merges:

 - #57008 (suggest `|` when `,` founds in invalid match value)
 - #57106 (Mark str::trim.* functions as #[must_use].)
 - #57920 (use `SOURCE_DATE_EPOCH` for man page time if set)
 - #57934 (Introduce into_raw_non_null on Rc and Arc)
 - #57971 (SGX target: improve panic & exit handling)
 - #57980 (Add the edition guide to the bookshelf)
 - #57984 (Improve bug message in check_ty)
 - #57999 (Add MOVBE x86 CPU feature)
 - #58000 (Fixes and cleanups)
 - #58005 (update docs for fix_start/end_matches)
 - #58007 (Don't panic when accessing enum variant ctor using `Self` in match)
 - #58008 (Pass correct arguments to places_conflict)

Failed merges:

r? @ghost

@bors bors merged commit 74e9057 into rust-lang:master Jan 31, 2019

1 of 2 checks passed

homu Test failed
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continuous-integration/travis-ci/pr The Travis CI build passed
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bors added a commit to rust-lang/rust-clippy that referenced this pull request Jan 31, 2019

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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