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Fix invalid removal of newlines from doc comments #92357

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GuillaumeGomez
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Fixes #91201.

Before:

Screenshot from 2021-12-28 17-02-11

After:

Screenshot from 2021-12-28 17-02-25

r? @camelid

@rustbot rustbot added T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-rustdoc Relevant to the rustdoc team, which will review and decide on the PR/issue. labels Dec 28, 2021
@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Dec 28, 2021
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camelid commented Dec 28, 2021

I realize this could be a breaking change, so I opened a discussion on Zulip.

@camelid camelid added S-waiting-on-team Status: Awaiting decision from the relevant subteam (see the T-<team> label). and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Dec 28, 2021
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Discussed at T-compiler meeting. Looks like T-rustdoc and T-compiler are all fine with it.

@rustbot label: -S-waiting-on-team +S-waiting-on-review

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-team Status: Awaiting decision from the relevant subteam (see the T-<team> label). labels Dec 30, 2021
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Can you add this as another @snapshot test case to mixing-doc-comments-and-attrs? After that (assuming the output is as two separate paragraphs), r=me

/** Par 1
*/ ///
/// Par 2

@camelid camelid added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jan 1, 2022
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camelid commented Jan 1, 2022

Interesting historical note: As part of reviewing this, I did a git blame to see when this line trimming code was added. It turns out it's existed since the very beginning of sugared doc comment syntax, back in 2012: 0b653ab#diff-4f03b42b44fcc76340e613b56e73a2202d12544a8b464a311a49ad0517d6e474R43-R48. I still don't know why trimming was considered necessary 🤷

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camelid commented Jan 1, 2022

Another historical note: The //~ ERROR syntax used in the test suite was originally //! ERROR. It had to be changed because of the new doc-comment syntax.

@camelid camelid changed the title Fix invalid removal of backlines from doc comments Fix invalid removal of newlines from doc comments Jan 1, 2022
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camelid commented Jan 1, 2022

@bors rollup=iffy (for performance and bisecting reasons)

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@camelid: Updated! I'll let you check if the added test looks like what you expected. ;)

@GuillaumeGomez GuillaumeGomez added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Jan 6, 2022
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camelid commented Jan 8, 2022

Oops, looks like I forgot to approve this.

@bors r+

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bors commented Jan 8, 2022

📌 Commit c6ee7bb has been approved by camelid

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jan 8, 2022
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camelid commented Jan 8, 2022

Marking this as relnotes for compatibility reasons. Probably not necessary, but maybe it's worth pointing out. Feel free to unmark this if you disagree.

@camelid camelid added the relnotes Marks issues that should be documented in the release notes of the next release. label Jan 8, 2022
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I think it's fine to mention it even though I don't expect anyone to be impacted by this.

bors added a commit to rust-lang-ci/rust that referenced this pull request Jan 10, 2022
…askrgr

Rollup of 7 pull requests

Successful merges:

 - rust-lang#92248 (Normalize struct tail type when checking Pointee trait)
 - rust-lang#92357 (Fix invalid removal of newlines from doc comments)
 - rust-lang#92602 (Make source links look cleaner)
 - rust-lang#92636 (Normalize generator-local types with unevaluated constants)
 - rust-lang#92693 (Release notes: add `Result::unwrap_{,err_}unchecked`)
 - rust-lang#92702 (Clean up lang_items::extract)
 - rust-lang#92717 (update miri)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit d20affb into rust-lang:master Jan 10, 2022
@rustbot rustbot added this to the 1.60.0 milestone Jan 10, 2022
@GuillaumeGomez GuillaumeGomez deleted the fix-doc-comment-backline-removal branch January 10, 2022 15:04
matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request Jan 20, 2022
…r=notriddle

Fix star handling in block doc comments

Fixes rust-lang#92872.

Some extra explanation about this PR and why rust-lang#92357 created this regression: when we merge doc comment kinds for example in:

```rust
/// he
/**
* hello
*/
#[doc = "boom"]
```

We don't want to remove the empty lines between them. However, to correctly compute the "horizontal trim", we still need it, so instead, I put back a part of the "vertical trim" directly in the "horizontal trim" computation so it doesn't impact the output buffer but allows us to correctly handle the stars.

r? `@camelid`
matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request Jan 20, 2022
…r=notriddle

Fix star handling in block doc comments

Fixes rust-lang#92872.

Some extra explanation about this PR and why rust-lang#92357 created this regression: when we merge doc comment kinds for example in:

```rust
/// he
/**
* hello
*/
#[doc = "boom"]
```

We don't want to remove the empty lines between them. However, to correctly compute the "horizontal trim", we still need it, so instead, I put back a part of the "vertical trim" directly in the "horizontal trim" computation so it doesn't impact the output buffer but allows us to correctly handle the stars.

r? ``@camelid``
wip-sync pushed a commit to NetBSD/pkgsrc-wip that referenced this pull request Apr 15, 2022
Pkgsrc changes:
 * Bump available bootstraps to 1.59.0.
 * Delete one patch which no longer applies,
   adjust another.

Upstream changes:

Version 1.60.0 (2022-04-07)
==========================

Language
--------
- [Stabilize `#[cfg(panic = "...")]` for either `"unwind"` or `"abort"`.]
  [93658]
- [Stabilize `#[cfg(target_has_atomic = "...")]` for each integer
  size and `"ptr"`.][93824]

Compiler
--------
- [Enable combining `+crt-static` and `relocation-model=pic` on
  `x86_64-unknown-linux-gnu`][86374]
- [Fixes wrong `unreachable_pub` lints on nested and glob public
  reexport][87487]
- [Stabilize `-Z instrument-coverage` as `-C instrument-coverage`][90132]
- [Stabilize `-Z print-link-args` as `--print link-args`][91606]
- [Add new Tier 3 target `mips64-openwrt-linux-musl`\*][92300]
- [Add new Tier 3 target `armv7-unknown-linux-uclibceabi` (softfloat)\*][92383]
- [Fix invalid removal of newlines from doc comments][92357]
- [Add kernel target for RustyHermit][92670]
- [Deny mixing bin crate type with lib crate types][92933]
- [Make rustc use `RUST_BACKTRACE=full` by default][93566]
- [Upgrade to LLVM 14][93577]

\* Refer to Rust's [platform support page][platform-support-doc] for more
   information on Rust's tiered platform support.

Libraries
---------
- [Guarantee call order for `sort_by_cached_key`][89621]
- [Improve `Duration::try_from_secs_f32`/`f64` accuracy by directly
  processing exponent and mantissa][90247]
- [Make `Instant::{duration_since, elapsed, sub}` saturating][89926]
- [Remove non-monotonic clocks workarounds in `Instant::now`][89926]
- [Make `BuildHasherDefault`, `iter::Empty` and `future::Pending`
  covariant][92630]

Stabilized APIs
---------------
- [`Arc::new_cyclic`][arc_new_cyclic]
- [`Rc::new_cyclic`][rc_new_cyclic]
- [`slice::EscapeAscii`][slice_escape_ascii]
- [`<[u8]>::escape_ascii`][slice_u8_escape_ascii]
- [`u8::escape_ascii`][u8_escape_ascii]
- [`Vec::spare_capacity_mut`][vec_spare_capacity_mut]
- [`MaybeUninit::assume_init_drop`][assume_init_drop]
- [`MaybeUninit::assume_init_read`][assume_init_read]
- [`i8::abs_diff`][i8_abs_diff]
- [`i16::abs_diff`][i16_abs_diff]
- [`i32::abs_diff`][i32_abs_diff]
- [`i64::abs_diff`][i64_abs_diff]
- [`i128::abs_diff`][i128_abs_diff]
- [`isize::abs_diff`][isize_abs_diff]
- [`u8::abs_diff`][u8_abs_diff]
- [`u16::abs_diff`][u16_abs_diff]
- [`u32::abs_diff`][u32_abs_diff]
- [`u64::abs_diff`][u64_abs_diff]
- [`u128::abs_diff`][u128_abs_diff]
- [`usize::abs_diff`][usize_abs_diff]
- [`Display for io::ErrorKind`][display_error_kind]
- [`From<u8> for ExitCode`][from_u8_exit_code]
- [`Not for !` (the "never" type)][not_never]
- [_Op_`Assign<$t> for Wrapping<$t>`][wrapping_assign_ops]
- [`arch::is_aarch64_feature_detected!`][is_aarch64_feature_detected]

Cargo
-----
- [Port cargo from `toml-rs` to `toml_edit`][cargo/10086]
- [Stabilize `-Ztimings` as `--timings`][cargo/10245]
- [Stabilize namespaced and weak dependency features.][cargo/10269]
- [Accept more `cargo:rustc-link-arg-*` types from build script
  output.][cargo/10274]
- [cargo-new should not add ignore rule on Cargo.lock inside
  subdirs][cargo/10379]

Misc
----
- [Ship docs on Tier 2 platforms by reusing the closest Tier 1
  platform docs][92800]
- [Drop rustc-docs from complete profile][93742]
- [bootstrap: tidy up flag handling for llvm build][93918]

Compatibility Notes
-------------------
- [Remove compiler-rt linking hack on Android][83822]
- [Mitigations for platforms with non-monotonic clocks have been removed from
  `Instant::now`][89926]. On platforms that don't provide monotonic clocks, an
  instant is not guaranteed to be greater than an earlier instant anymore.
- [`Instant::{duration_since, elapsed, sub}` do not panic anymore on underflow,
  saturating to `0` instead][89926]. In the real world the panic happened mostly
  on platforms with buggy monotonic clock implementations rather than catching
  programming errors like reversing the start and end times. Such programming
  errors will now results in `0` rather than a panic.
- In a future release we're planning to increase the baseline requirements for
  the Linux kernel to version 3.2, and for glibc to version 2.17. We'd love
  your feedback in [PR #95026][95026].

Internal Changes
----------------

These changes provide no direct user facing benefits, but represent
significant improvements to the internals and overall performance
of rustc and related tools.

- [Switch all libraries to the 2021 edition][92068]

[83822]: rust-lang/rust#83822
[86374]: rust-lang/rust#86374
[87487]: rust-lang/rust#87487
[89621]: rust-lang/rust#89621
[89926]: rust-lang/rust#89926
[90132]: rust-lang/rust#90132
[90247]: rust-lang/rust#90247
[91606]: rust-lang/rust#91606
[92068]: rust-lang/rust#92068
[92300]: rust-lang/rust#92300
[92357]: rust-lang/rust#92357
[92383]: rust-lang/rust#92383
[92630]: rust-lang/rust#92630
[92670]: rust-lang/rust#92670
[92800]: rust-lang/rust#92800
[92933]: rust-lang/rust#92933
[93566]: rust-lang/rust#93566
[93577]: rust-lang/rust#93577
[93658]: rust-lang/rust#93658
[93742]: rust-lang/rust#93742
[93824]: rust-lang/rust#93824
[93918]: rust-lang/rust#93918
[95026]: rust-lang/rust#95026

[cargo/10086]: rust-lang/cargo#10086
[cargo/10245]: rust-lang/cargo#10245
[cargo/10269]: rust-lang/cargo#10269
[cargo/10274]: rust-lang/cargo#10274
[cargo/10379]: rust-lang/cargo#10379

[arc_new_cyclic]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.new_cyclic
[rc_new_cyclic]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.new_cyclic
[slice_escape_ascii]: https://doc.rust-lang.org/stable/std/slice/struct.EscapeAscii.html
[slice_u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.escape_ascii
[u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.escape_ascii
[vec_spare_capacity_mut]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.spare_capacity_mut
[assume_init_drop]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_drop
[assume_init_read]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_read
[i8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.abs_diff
[i16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.abs_diff
[i32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.abs_diff
[i64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.abs_diff
[i128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.abs_diff
[isize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.abs_diff
[u8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.abs_diff
[u16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.abs_diff
[u32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.abs_diff
[u64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.abs_diff
[u128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.abs_diff
[usize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.abs_diff
[display_error_kind]: https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#impl-Display
[from_u8_exit_code]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html#impl-From%3Cu8%3E
[not_never]: https://doc.rust-lang.org/stable/std/primitive.never.html#impl-Not
[wrapping_assign_ops]: https://doc.rust-lang.org/stable/std/num/struct.Wrapping.html#trait-implementations
[is_aarch64_feature_detected]: https://doc.rust-lang.org/stable/std/arch/macro.is_aarch64_feature_detected.html
netbsd-srcmastr pushed a commit to NetBSD/pkgsrc that referenced this pull request May 25, 2022
Pkgsrc changes:
 * Bump available bootstraps to 1.59.0.
 * Adjust line number in patches which had non-zero offsets.

Upstream changes:

Version 1.60.0 (2022-04-07)
===========================

Language
--------
- [Stabilize `#[cfg(panic = "...")]` for either `"unwind"` or `"abort"`.]
  [93658]
- [Stabilize `#[cfg(target_has_atomic = "...")]` for each integer
  size and `"ptr"`.][93824]

Compiler
--------
- [Enable combining `+crt-static` and `relocation-model=pic` on
  `x86_64-unknown-linux-gnu`][86374]
- [Fixes wrong `unreachable_pub` lints on nested and glob public
  reexport][87487]
- [Stabilize `-Z instrument-coverage` as `-C instrument-coverage`][90132]
- [Stabilize `-Z print-link-args` as `--print link-args`][91606]
- [Add new Tier 3 target `mips64-openwrt-linux-musl`\*][92300]
- [Add new Tier 3 target `armv7-unknown-linux-uclibceabi` (softfloat)\*][92383]
- [Fix invalid removal of newlines from doc comments][92357]
- [Add kernel target for RustyHermit][92670]
- [Deny mixing bin crate type with lib crate types][92933]
- [Make rustc use `RUST_BACKTRACE=full` by default][93566]
- [Upgrade to LLVM 14][93577]

\* Refer to Rust's [platform support page][platform-support-doc] for more
   information on Rust's tiered platform support.

Libraries
---------
- [Guarantee call order for `sort_by_cached_key`][89621]
- [Improve `Duration::try_from_secs_f32`/`f64` accuracy by directly
  processing exponent and mantissa][90247]
- [Make `Instant::{duration_since, elapsed, sub}` saturating][89926]
- [Remove non-monotonic clocks workarounds in `Instant::now`][89926]
- [Make `BuildHasherDefault`, `iter::Empty` and `future::Pending`
  covariant][92630]

Stabilized APIs
---------------
- [`Arc::new_cyclic`][arc_new_cyclic]
- [`Rc::new_cyclic`][rc_new_cyclic]
- [`slice::EscapeAscii`][slice_escape_ascii]
- [`<[u8]>::escape_ascii`][slice_u8_escape_ascii]
- [`u8::escape_ascii`][u8_escape_ascii]
- [`Vec::spare_capacity_mut`][vec_spare_capacity_mut]
- [`MaybeUninit::assume_init_drop`][assume_init_drop]
- [`MaybeUninit::assume_init_read`][assume_init_read]
- [`i8::abs_diff`][i8_abs_diff]
- [`i16::abs_diff`][i16_abs_diff]
- [`i32::abs_diff`][i32_abs_diff]
- [`i64::abs_diff`][i64_abs_diff]
- [`i128::abs_diff`][i128_abs_diff]
- [`isize::abs_diff`][isize_abs_diff]
- [`u8::abs_diff`][u8_abs_diff]
- [`u16::abs_diff`][u16_abs_diff]
- [`u32::abs_diff`][u32_abs_diff]
- [`u64::abs_diff`][u64_abs_diff]
- [`u128::abs_diff`][u128_abs_diff]
- [`usize::abs_diff`][usize_abs_diff]
- [`Display for io::ErrorKind`][display_error_kind]
- [`From<u8> for ExitCode`][from_u8_exit_code]
- [`Not for !` (the "never" type)][not_never]
- [_Op_`Assign<$t> for Wrapping<$t>`][wrapping_assign_ops]
- [`arch::is_aarch64_feature_detected!`][is_aarch64_feature_detected]

Cargo
-----
- [Port cargo from `toml-rs` to `toml_edit`][cargo/10086]
- [Stabilize `-Ztimings` as `--timings`][cargo/10245]
- [Stabilize namespaced and weak dependency features.][cargo/10269]
- [Accept more `cargo:rustc-link-arg-*` types from build script
  output.][cargo/10274]
- [cargo-new should not add ignore rule on Cargo.lock inside
  subdirs][cargo/10379]

Misc
----
- [Ship docs on Tier 2 platforms by reusing the closest Tier 1
  platform docs][92800]
- [Drop rustc-docs from complete profile][93742]
- [bootstrap: tidy up flag handling for llvm build][93918]

Compatibility Notes
-------------------
- [Remove compiler-rt linking hack on Android][83822]
- [Mitigations for platforms with non-monotonic clocks have been removed from
  `Instant::now`][89926]. On platforms that don't provide monotonic clocks, an
  instant is not guaranteed to be greater than an earlier instant anymore.
- [`Instant::{duration_since, elapsed, sub}` do not panic anymore on underflow,
  saturating to `0` instead][89926]. In the real world the panic happened mostly
  on platforms with buggy monotonic clock implementations rather than catching
  programming errors like reversing the start and end times. Such programming
  errors will now results in `0` rather than a panic.
- In a future release we're planning to increase the baseline requirements for
  the Linux kernel to version 3.2, and for glibc to version 2.17. We'd love
  your feedback in [PR #95026][95026].

Internal Changes
----------------

These changes provide no direct user facing benefits, but represent
significant improvements to the internals and overall performance
of rustc and related tools.

- [Switch all libraries to the 2021 edition][92068]

[83822]: rust-lang/rust#83822
[86374]: rust-lang/rust#86374
[87487]: rust-lang/rust#87487
[89621]: rust-lang/rust#89621
[89926]: rust-lang/rust#89926
[90132]: rust-lang/rust#90132
[90247]: rust-lang/rust#90247
[91606]: rust-lang/rust#91606
[92068]: rust-lang/rust#92068
[92300]: rust-lang/rust#92300
[92357]: rust-lang/rust#92357
[92383]: rust-lang/rust#92383
[92630]: rust-lang/rust#92630
[92670]: rust-lang/rust#92670
[92800]: rust-lang/rust#92800
[92933]: rust-lang/rust#92933
[93566]: rust-lang/rust#93566
[93577]: rust-lang/rust#93577
[93658]: rust-lang/rust#93658
[93742]: rust-lang/rust#93742
[93824]: rust-lang/rust#93824
[93918]: rust-lang/rust#93918
[95026]: rust-lang/rust#95026

[cargo/10086]: rust-lang/cargo#10086
[cargo/10245]: rust-lang/cargo#10245
[cargo/10269]: rust-lang/cargo#10269
[cargo/10274]: rust-lang/cargo#10274
[cargo/10379]: rust-lang/cargo#10379

[arc_new_cyclic]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.new_cyclic
[rc_new_cyclic]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.new_cyclic
[slice_escape_ascii]: https://doc.rust-lang.org/stable/std/slice/struct.EscapeAscii.html
[slice_u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.escape_ascii
[u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.escape_ascii
[vec_spare_capacity_mut]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.spare_capacity_mut
[assume_init_drop]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_drop
[assume_init_read]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_read
[i8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.abs_diff
[i16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.abs_diff
[i32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.abs_diff
[i64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.abs_diff
[i128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.abs_diff
[isize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.abs_diff
[u8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.abs_diff
[u16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.abs_diff
[u32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.abs_diff
[u64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.abs_diff
[u128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.abs_diff
[usize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.abs_diff
[display_error_kind]: https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#impl-Display
[from_u8_exit_code]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html#impl-From%3Cu8%3E
[not_never]: https://doc.rust-lang.org/stable/std/primitive.never.html#impl-Not
[wrapping_assign_ops]: https://doc.rust-lang.org/stable/std/num/struct.Wrapping.html#trait-implementations
[is_aarch64_feature_detected]: https://doc.rust-lang.org/stable/std/arch/macro.is_aarch64_feature_detected.html
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Newlines don't cause a paragraph break when mixing #[doc] and ///
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