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Stabilize #[cfg(panic = "...")] #93658

Merged
merged 7 commits into from
Feb 19, 2022
Merged

Stabilize #[cfg(panic = "...")] #93658

merged 7 commits into from
Feb 19, 2022

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cchiw
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@cchiw cchiw commented Feb 4, 2022

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Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @michaelwoerister (or someone else) soon.

Please see the contribution instructions for more information.

@rustbot rustbot added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Feb 4, 2022
@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Feb 4, 2022
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@Manishearth Manishearth changed the title Issue 77443 fix Stabilize #[cfg(panic = "...")] Feb 4, 2022
@joshtriplett joshtriplett added I-lang-nominated Nominated for discussion during a lang team meeting. T-lang Relevant to the language team, which will review and decide on the PR/issue. and removed T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Feb 5, 2022
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bors commented Feb 7, 2022

☔ The latest upstream changes (presumably #93738) made this pull request unmergeable. Please resolve the merge conflicts.

@rustbot rustbot added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Feb 7, 2022
@joshtriplett joshtriplett added the relnotes Marks issues that should be documented in the release notes of the next release. label Feb 8, 2022
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Note: when announcing this in the release notes, we should document that people shouldn't write code assuming only two panic strategies (e.g. #[cfg(panic = "abort")] being equivalent to #[cfg(not(panic = "unwind"))] and vice versa).

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Shall we stabilize #[cfg(panic = "...")]?

@rfcbot merge

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rfcbot commented Feb 8, 2022

Team member @joshtriplett has proposed to merge this. The next step is review by the rest of the tagged team members:

No concerns currently listed.

Once a majority of reviewers approve (and at most 2 approvals are outstanding), this will enter its final comment period. If you spot a major issue that hasn't been raised at any point in this process, please speak up!

See this document for info about what commands tagged team members can give me.

@rfcbot rfcbot added proposed-final-comment-period Proposed to merge/close by relevant subteam, see T-<team> label. Will enter FCP once signed off. disposition-merge This issue / PR is in PFCP or FCP with a disposition to merge it. labels Feb 8, 2022
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scottmcm commented Feb 8, 2022

@rfcbot reviewed

(I don't know if this is a complex enough feature for compiler folks to want to be included, BTW.)

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Yeah, I missed that this was also tagged T-compiler.

Removing T-compiler for a T-lang FCP, but if anyone on T-compiler has concerns with this feature, please feel free to raise them.

@rfcbot cancel

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@joshtriplett proposal cancelled.

@rfcbot rfcbot removed proposed-final-comment-period Proposed to merge/close by relevant subteam, see T-<team> label. Will enter FCP once signed off. disposition-merge This issue / PR is in PFCP or FCP with a disposition to merge it. labels Feb 8, 2022
@joshtriplett joshtriplett removed the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Feb 8, 2022
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@rfcbot merge

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rfcbot commented Feb 8, 2022

Team member @joshtriplett has proposed to merge this. The next step is review by the rest of the tagged team members:

No concerns currently listed.

Once a majority of reviewers approve (and at most 2 approvals are outstanding), this will enter its final comment period. If you spot a major issue that hasn't been raised at any point in this process, please speak up!

See this document for info about what commands tagged team members can give me.

@rfcbot rfcbot added proposed-final-comment-period Proposed to merge/close by relevant subteam, see T-<team> label. Will enter FCP once signed off. disposition-merge This issue / PR is in PFCP or FCP with a disposition to merge it. final-comment-period In the final comment period and will be merged soon unless new substantive objections are raised. labels Feb 8, 2022
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rfcbot commented Feb 8, 2022

🔔 This is now entering its final comment period, as per the review above. 🔔

@rustbot rustbot added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Feb 10, 2022
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@rfcbot reviewed

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cchiw commented Feb 14, 2022

The documentation previously in src/doc/unstable-book/src/language-features/cfg-panic.md (minus the bits about the unstable feature gate) should go somewhere, such as in the reference. We shouldn't just delete it without replacement.

Otherwise, LGTM.

Just FYI, additional documentation was accepted by Rust for Example

@Mark-Simulacrum Mark-Simulacrum removed the I-lang-nominated Nominated for discussion during a lang team meeting. label Feb 15, 2022
@rfcbot rfcbot added finished-final-comment-period The final comment period is finished for this PR / Issue. to-announce Announce this issue on triage meeting and removed final-comment-period In the final comment period and will be merged soon unless new substantive objections are raised. labels Feb 18, 2022
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The final comment period, with a disposition to merge, as per the review above, is now complete.

As the automated representative of the governance process, I would like to thank the author for their work and everyone else who contributed.

This will be merged soon.

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Manishearth commented Feb 18, 2022

@bors r=joshtriplett

(#93658 (comment))

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bors commented Feb 18, 2022

📌 Commit dbeab9c has been approved by joshtriplett

@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 Feb 18, 2022
bors added a commit to rust-lang-ci/rust that referenced this pull request Feb 19, 2022
…askrgr

Rollup of 7 pull requests

Successful merges:

 - rust-lang#92902 (Improve the documentation of drain members)
 - rust-lang#93658 (Stabilize `#[cfg(panic = "...")]`)
 - rust-lang#93954 (rustdoc-json: buffer output)
 - rust-lang#93979 (Add debug assertions to validate NUL terminator in c strings)
 - rust-lang#93990 (pre rust-lang#89862 cleanup)
 - rust-lang#94006 (Use a `Field` in `ConstraintCategory::ClosureUpvar`)
 - rust-lang#94086 (Fix ScalarInt to char conversion)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit f19adc7 into rust-lang:master Feb 19, 2022
@rustbot rustbot added this to the 1.60.0 milestone Feb 19, 2022
@apiraino apiraino removed the to-announce Announce this issue on triage meeting label Mar 3, 2022
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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