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Upgrade to LLVM 14 #93577

Merged
merged 8 commits into from
Feb 17, 2022
Merged

Upgrade to LLVM 14 #93577

merged 8 commits into from
Feb 17, 2022

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nikic
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@nikic nikic commented Feb 2, 2022

LLVM patch state:

Release timeline:

  • LLVM 14.0.0 final planned for Mar 15.
  • Rust 1.60.0 planned for Apr 7.

Compile-time:

r? @ghost

@rustbot rustbot added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Feb 2, 2022
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nikic commented Feb 2, 2022

@bors try @rust-timer queue

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Awaiting bors try build completion.

@rustbot label: +S-waiting-on-perf

@rustbot rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Feb 2, 2022
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bors commented Feb 2, 2022

⌛ Trying commit cd8e4503bfe75258bad597fa5a1366505808dc55 with merge cc23adbddf8f354aad5b3f3e9b2aedccfd38a89b...

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bors commented Feb 2, 2022

💔 Test failed - checks-actions

@bors bors added the S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. label Feb 2, 2022
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nikic commented Feb 2, 2022

@bors try

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bors commented Feb 2, 2022

⌛ Trying commit 07dfa390d71e89e2dc29bb920bd140ab08132543 with merge 610f0992faa3ebd54080a805f5bd068a720bce01...

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bors commented Feb 2, 2022

💔 Test failed - checks-actions

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nikic commented Feb 2, 2022

@bors try

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bors commented Feb 2, 2022

⌛ Trying commit 34f8765ec33b05e7a2637ad96381dba63457e32c with merge 2d4ed6f605ac632165706d1d4af30d9aa2b840e6...

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bors commented Feb 2, 2022

💔 Test failed - checks-actions

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nikic commented Feb 2, 2022

@bors try

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bors commented Feb 2, 2022

⌛ Trying commit de2b6aac7c4a8a8c9a335fcbec66cd58eae98092 with merge b87df8d2c7c5d9ac448c585de10927ab2ee1b864...

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bors commented Feb 2, 2022

☀️ Try build successful - checks-actions
Build commit: b87df8d2c7c5d9ac448c585de10927ab2ee1b864 (b87df8d2c7c5d9ac448c585de10927ab2ee1b864)

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Queued b87df8d2c7c5d9ac448c585de10927ab2ee1b864 with parent 250384e, future comparison URL.

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Finished benchmarking commit (b87df8d2c7c5d9ac448c585de10927ab2ee1b864): comparison url.

Summary: This benchmark run shows 134 relevant improvements 🎉 but 58 relevant regressions 😿 to instruction counts.

  • Average relevant regression: 0.6%
  • Average relevant improvement: -1.1%
  • Largest improvement in instruction counts: -3.3% on full builds of ctfe-stress-4 check
  • Largest regression in instruction counts: 2.1% on incr-full builds of piston-image opt

If you disagree with this performance assessment, please file an issue in rust-lang/rustc-perf.

Benchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. While you can manually mark this PR as fit for rollup, we strongly recommend not doing so since this PR led to changes in compiler perf.

Next Steps: If you can justify the regressions found in this try perf run, please indicate this with @rustbot label: +perf-regression-triaged along with sufficient written justification. If you cannot justify the regressions please fix the regressions and do another perf run. If the next run shows neutral or positive results, the label will be automatically removed.

@bors rollup=never
@rustbot label: +S-waiting-on-review -S-waiting-on-perf +perf-regression

@rustbot rustbot added perf-regression Performance regression. S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Feb 2, 2022
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bors commented Feb 17, 2022

⌛ Testing commit 75636bb with merge 30b3f35...

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bors commented Feb 17, 2022

☀️ Test successful - checks-actions
Approved by: nagisa
Pushing 30b3f35 to master...

@bors bors added the merged-by-bors This PR was explicitly merged by bors. label Feb 17, 2022
@bors bors merged commit 30b3f35 into rust-lang:master Feb 17, 2022
@rustbot rustbot added this to the 1.60.0 milestone Feb 17, 2022
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Nice ;).

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Finished benchmarking commit (30b3f35): comparison url.

Summary: This benchmark run shows 153 relevant improvements 🎉 but 51 relevant regressions 😿 to instruction counts.

  • Average relevant regression: 0.7%
  • Average relevant improvement: -1.3%
  • Largest improvement in instruction counts: -3.8% on full builds of projection-caching check
  • Largest regression in instruction counts: 3.0% on incr-patched: add static arr item builds of coercions debug

If you disagree with this performance assessment, please file an issue in rust-lang/rustc-perf.

Next Steps: If you can justify the regressions found in this perf run, please indicate this with @rustbot label: +perf-regression-triaged along with sufficient written justification. If you cannot justify the regressions please open an issue or create a new PR that fixes the regressions, add a comment linking to the newly created issue or PR, and then add the perf-regression-triaged label to this PR.

@rustbot label: +perf-regression

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LLVM 14.0.0 final planned for Mar 15.
Rust 1.60.0 planned for Apr 7.

If there isn't an urgent reason to upgrade to LLVM 14 then maybe it is worth waiting for the release? IMO three weeks between when LLVM 14 final is expected to ship is not enough window. There's a good chance that the LLVM 14 release won't be fully rolled out or people will otherwise have trouble upgrading to LLVM 14.

When Rust upgrades to an as-yet-unreleased LLVM version, this breaks some (many?) people's CI/CD code coverage measurement, as often the LLVM tools version has to match Rust's LLVM version exactly in order for the coverage data to be accurate. It is pretty difficult to acquire a pre-release version of LLVM tools on certain platforms. Not sure if this aspect was overlooked or if it is expected breakage.

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nikic commented Feb 18, 2022

@briansmith I took a look at your CI config, and it looks like switching https://github.com/rustls/rustls/blob/5bda754ac18f37eb39132f89fb5522494b6202eb/.github/workflows/build.yml#L185 to llvm-toolchain-bionic-14 should work fine? This is available for pre-releases as well.

We always update LLVM for nightly well in advance of the release to make sure that any issues we discover can actually make it into the release. Our timing is chosen such that a stable LLVM release is available by the time the update makes it into a stable Rust release.

In this particular instance, we may want to revert the upgrade from the beta branch once promotion happens, because it landed very close to promotion this time, and we may want to give it more time to bake in nightly.

By the way, I believe -C instrument-coverage was recently stabilized, so you should be able to use a stable toolchain (with a stable LLVM release) for coverage in the future.

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rylev commented Feb 24, 2022

Upgrading LLVM is always likely to produce performance changes. Luckily the perf improvements seem to outweigh the perf regressions considerably both in number and magnitude.

@rustbot label: +perf-regression-triaged

@rustbot rustbot added the perf-regression-triaged The performance regression has been triaged. label Feb 24, 2022
bors added a commit to rust-lang-ci/rust that referenced this pull request Feb 25, 2022
Use undef for (some) partially-uninit constants

There needs to be some limit to avoid perf regressions on large arrays
with undef in each element (see comment in the code).

Fixes: rust-lang#84565
Original PR: rust-lang#83698

Depends on LLVM 14: rust-lang#93577
vladimir-ea pushed a commit to vladimir-ea/compiler-builtins that referenced this pull request Mar 8, 2022
As of https://reviews.llvm.org/D110413, these no longer use the
unadjusted ABI (and use normal C ABI instead, passing i128
indirectly and returning it as <2 x i64>).

To support both LLVM 14 and older versions, rustc will expose a
"llvm14-builtins-abi" target feature, based on which
compiler-builtins can chose the appropriate ABI.

This is needed for rust-lang/rust#93577.
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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