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Remove unnecessary bounds for some Hash{Map,Set} methods #91593

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merged 1 commit into from
Jan 2, 2022

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upsuper
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@upsuper upsuper commented Dec 6, 2021

This PR moves HashMap::{into_keys,into_values,retain} and HashSet::retain from impl blocks with K: Eq + Hash, S: BuildHasher into the blocks without them. It doesn't seem to me there is any reason these methods need to be bounded by that. This change brings HashMap::{into_keys,into_values} on par with HashMap::{keys,values,values_mut} which are not bounded either.

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r? @kennytm

(rust-highfive has picked a reviewer for you, use r? to override)

@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Dec 6, 2021
@kennytm kennytm added the T-libs-api Relevant to the library API team, which will review and decide on the PR/issue. label Dec 6, 2021
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kennytm commented Dec 6, 2021

i think we need an FCP like #79245

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upsuper commented Dec 7, 2021

r? @dtolnay

@rust-highfive rust-highfive assigned dtolnay and unassigned kennytm Dec 7, 2021
@joshtriplett joshtriplett added the needs-fcp This change is insta-stable, so needs a completed FCP to proceed. label Dec 7, 2021
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bors commented Dec 11, 2021

☔ The latest upstream changes (presumably #91760) made this pull request unmergeable. Please resolve the merge conflicts.

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bors commented Dec 11, 2021

☔ The latest upstream changes (presumably #91761) made this pull request unmergeable. Please resolve the merge conflicts.

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Folyd commented Dec 17, 2021

I'm in favor of the K: Eq + Hash, S: BuildHasher bound is unnecessary. BTW, don't forget the BTreeMap/Set::into_key/values().

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into_keys and into_values seems straightforward to me, since IntoIterator for HashMap and IntoIterator for &HashMap already do not require any bound to iterate, and these functions are doing even less because they don't even iterate, just stick self inside of an iterator struct, which already has no bounds on its Iterator impl.

retain is not obvious to me. Is there an easy way to see why this wouldn't need to rehash items as part of shrinking the map, in any hash map implementation?

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upsuper commented Dec 20, 2021

retain is not obvious to me. Is there an easy way to see why this wouldn't need to rehash items as part of shrinking the map, in any hash map implementation?

It's a good question. I don't think retain should ever shrink the hash map in capacity. It doesn't now, nor do retains of other collections, and as long as we want to guarantee deletion of a single entry wouldn't trigger a reallocation, the same guarantee should always apply to retain as well, since retain is just a batch deletion.

The question then fall into whether we ever need to rehash anything for deletion of an entry. I feel this is hard, if not impossible, to prove, as there is an open design space. However, it may not matter here, because in std's API, OccupiedEntry::remove_entry is stable and doesn't have the bounds, so any implementation that Rust can be using would likely be restricted by this API, and is unable to do any rehash when removing a single entry. (TBH, as you can't get an occupied entry without going through a function bounded by the traits, theoretically it's possible to pre-compute all needed rehashes and store it inside OccupiedEntry, but that's likely a lot of unnecessary computation, and would probably be a violation of zero cost principle.)

Since retain is semantically just a combination of

  • going through each occupied entry, which HashMap::iter_mut is already doing without the bounds, and
  • conditionally delete entries occurred, which OccupiedEntry::remove_entry can do without the bounds

I believe it wouldn't ever need the bounds.

Also, if the bounds here are deemed not to be dropped for retain, we should also move the unstable HashMap::drain_filter (tracked in #59618) into the bounded impl block before stabilization, since it's a more powerful version of retain.

@upsuper upsuper requested a review from dtolnay December 20, 2021 22:56
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dtolnay commented Dec 20, 2021

Let's get the rest of the team to weigh in.

  impl<K, V, S> HashMap<K, V, S> {
      pub fn into_keys(self) -> IntoKeys<K, V>
      where
-         K: Eq + Hash,
-         S: BuildHasher;

      pub fn into_values(self) -> IntoValues<K, V>
      where
-         K: Eq + Hash,
-         S: BuildHasher;

      pub fn retain<F>(&mut self, f: F)
      where
-         K: Eq + Hash,
-         S: BuildHasher,
          F: FnMut(&K, &mut V) -> bool;
  }

  impl<T, S> HashSet<T, S> {
      pub fn retain<F>(&mut self, f: F)
      where
-         T: Eq + Hash,
-         S: BuildHasher,
          F: FnMut(&T) -> bool;
  }

@rfcbot fcp merge

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rfcbot commented Dec 20, 2021

Team member @dtolnay 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 Dec 20, 2021
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Interesting! I agree that remove_entry is effectively constraining possible implementations here; good catch. That does limit some hash table designs, but those designs are already limited.

@rfcbot reviewed

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rfcbot commented Dec 22, 2021

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

@rfcbot rfcbot added final-comment-period In the final comment period and will be merged soon unless new substantive objections are raised. and removed proposed-final-comment-period Proposed to merge/close by relevant subteam, see T-<team> label. Will enter FCP once signed off. labels Dec 22, 2021
@rfcbot rfcbot added finished-final-comment-period The final comment period is finished for this PR / Issue. and removed final-comment-period In the final comment period and will be merged soon unless new substantive objections are raised. labels Jan 1, 2022
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rfcbot commented Jan 1, 2022

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.

@rfcbot rfcbot added the to-announce Announce this issue on triage meeting label Jan 1, 2022
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Thanks!

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dtolnay commented Jan 1, 2022

@bors r+

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bors commented Jan 1, 2022

📌 Commit fb1e031 has been approved by dtolnay

@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 1, 2022
bors added a commit to rust-lang-ci/rust that referenced this pull request Jan 2, 2022
…askrgr

Rollup of 7 pull requests

Successful merges:

 - rust-lang#84083 (Clarify the guarantees that ThreadId does and doesn't make.)
 - rust-lang#91593 (Remove unnecessary bounds for some Hash{Map,Set} methods)
 - rust-lang#92297 (Reduce compile time of rustbuild)
 - rust-lang#92332 (Add test for where clause order)
 - rust-lang#92438 (Enforce formatting for rustc_codegen_cranelift)
 - rust-lang#92463 (Remove pronunciation guide from Vec<T>)
 - rust-lang#92468 (Emit an error for `--cfg=)`)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 5137f7c into rust-lang:master Jan 2, 2022
@rustbot rustbot added this to the 1.59.0 milestone Jan 2, 2022
@upsuper upsuper deleted the hashmap-set-methods-bound branch January 2, 2022 03:40
@apiraino apiraino removed the to-announce Announce this issue on triage meeting label Jan 6, 2022
wip-sync pushed a commit to NetBSD/pkgsrc-wip that referenced this pull request Mar 2, 2022
Pkgsrc changes:
 * Bump available bootstraps to 1.58.1.
 * Adjust one patch (and checksum) so that it still applies.

Upstream changes:

Version 1.59.0 (2022-02-24)
==========================

Language
--------

- [Stabilize default arguments for const generics][90207]
- [Stabilize destructuring assignment][90521]
- [Relax private in public lint on generic bounds and where clauses
  of trait impls][90586]
- [Stabilize asm! and global_asm! for x86, x86_64, ARM, Aarch64,
  and RISC-V][91728]

Compiler
--------

- [Stabilize new symbol mangling format, leaving it opt-in
  (-Csymbol-mangling-version=v0)][90128]
- [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
- [Fix sparc64 ABI for aggregates with floating point members][91003]
- [Warn when a `#[test]`-like built-in attribute macro is present
  multiple times.][91172]
- [Add support for riscv64gc-unknown-freebsd][91284]
- [Stabilize `-Z emit-future-incompat` as `--json future-incompat`][91535]
- [Soft disable incremental compilation][94124]

This release disables incremental compilation, unless the user has explicitly
opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
This is due to a known and relatively frequently occurring bug in incremental
compilation, which causes builds to issue internal compiler errors. This
particular bug is already fixed on nightly, but that fix has not yet rolled out
to stable and is deemed too risky for a direct stable backport.

As always, we encourage users to test with nightly and report bugs so that we
can track failures and fix issues earlier.

See [94124] for more details.

[94124]: rust-lang/rust#94124

Libraries
---------

- [Remove unnecessary bounds for some Hash{Map,Set} methods][91593]

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

- [`std::thread::available_parallelism`][available_parallelism]
- [`Result::copied`][result-copied]
- [`Result::cloned`][result-cloned]
- [`arch::asm!`][asm]
- [`arch::global_asm!`][global_asm]
- [`ops::ControlFlow::is_break`][is_break]
- [`ops::ControlFlow::is_continue`][is_continue]
- [`TryFrom<char> for u8`][try_from_char_u8]
- [`char::TryFromCharError`][try_from_char_err]
  implementing `Clone`, `Debug`, `Display`, `PartialEq`, `Copy`, `Eq`, `Error`
- [`iter::zip`][zip]
- [`NonZeroU8::is_power_of_two`][is_power_of_two8]
- [`NonZeroU16::is_power_of_two`][is_power_of_two16]
- [`NonZeroU32::is_power_of_two`][is_power_of_two32]
- [`NonZeroU64::is_power_of_two`][is_power_of_two64]
- [`NonZeroU128::is_power_of_two`][is_power_of_two128]
- [`DoubleEndedIterator for ToLowercase`][lowercase]
- [`DoubleEndedIterator for ToUppercase`][uppercase]
- [`TryFrom<&mut [T]> for [T; N]`][tryfrom_ref_arr]
- [`UnwindSafe for Once`][unwindsafe_once]
- [`RefUnwindSafe for Once`][refunwindsafe_once]
- [armv8 neon intrinsics for aarch64][stdarch/1266]

Const-stable:

- [`mem::MaybeUninit::as_ptr`][muninit_ptr]
- [`mem::MaybeUninit::assume_init`][muninit_init]
- [`mem::MaybeUninit::assume_init_ref`][muninit_init_ref]
- [`ffi::CStr::from_bytes_with_nul_unchecked`][cstr_from_bytes]

Cargo
-----

- [Stabilize the `strip` profile option][cargo/10088]
- [Stabilize future-incompat-report][cargo/10165]
- [Support abbreviating `--release` as `-r`][cargo/10133]
- [Support `term.quiet` configuration][cargo/10152]
- [Remove `--host` from cargo {publish,search,login}][cargo/10145]

Compatibility Notes
-------------------

- [Refactor weak symbols in std::sys::unix][90846]
  This may add new, versioned, symbols when building with a newer glibc, as the
  standard library uses weak linkage rather than dynamically attempting to load
  certain symbols at runtime.
- [Deprecate crate_type and crate_name nested inside `#![cfg_attr]`][83744]
  This adds a future compatibility lint to supporting the use of cfg_attr
  wrapping either crate_type or crate_name specification within Rust files;
  it is recommended that users migrate to setting the equivalent command line
  flags.
- [Remove effect of `#[no_link]` attribute on name resolution][92034]
  This may expose new names, leading to conflicts with preexisting names in a
  given namespace and a compilation failure.
- [Cargo will document libraries before binaries.][cargo/10172]
- [Respect doc=false in dependencies, not just the root crate][cargo/10201]
- [Weaken guarantee around advancing underlying iterators in zip][83791]
- [Make split_inclusive() on an empty slice yield an empty output][89825]
- [Update std::env::temp_dir to use GetTempPath2 on Windows when
  available.][89999]
- [unreachable! was updated to match other formatting macro behavior
  on Rust 2021][92137]

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.

- [Fix many cases of normalization-related ICEs][91255]
- [Replace dominators algorithm with simple Lengauer-Tarjan][85013]
- [Store liveness in interval sets for region inference][90637]

- [Remove `in_band_lifetimes` from the compiler and standard library,
  in preparation for removing this unstable feature.][91867]

[91867]: rust-lang/rust#91867
[83744]: rust-lang/rust#83744
[83791]: rust-lang/rust#83791
[85013]: rust-lang/rust#85013
[89825]: rust-lang/rust#89825
[89999]: rust-lang/rust#89999
[90128]: rust-lang/rust#90128
[90207]: rust-lang/rust#90207
[90521]: rust-lang/rust#90521
[90586]: rust-lang/rust#90586
[90637]: rust-lang/rust#90637
[90833]: rust-lang/rust#90833
[90846]: rust-lang/rust#90846
[91003]: rust-lang/rust#91003
[91172]: rust-lang/rust#91172
[91255]: rust-lang/rust#91255
[91284]: rust-lang/rust#91284
[91535]: rust-lang/rust#91535
[91593]: rust-lang/rust#91593
[91728]: rust-lang/rust#91728
[91878]: rust-lang/rust#91878
[91896]: rust-lang/rust#91896
[91926]: rust-lang/rust#91926
[91984]: rust-lang/rust#91984
[92020]: rust-lang/rust#92020
[92034]: rust-lang/rust#92034
[92483]: rust-lang/rust#92483
[cargo/10088]: rust-lang/cargo#10088
[cargo/10133]: rust-lang/cargo#10133
[cargo/10145]: rust-lang/cargo#10145
[cargo/10152]: rust-lang/cargo#10152
[cargo/10165]: rust-lang/cargo#10165
[cargo/10172]: rust-lang/cargo#10172
[cargo/10201]: rust-lang/cargo#10201
[cargo/10269]: rust-lang/cargo#10269

[cstr_from_bytes]: https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked
[muninit_ptr]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
[muninit_init]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
[muninit_init_ref]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
[unwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-UnwindSafe
[refunwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-RefUnwindSafe
[tryfrom_ref_arr]: https://doc.rust-lang.org/stable/std/convert/trait.TryFrom.html#impl-TryFrom%3C%26%27_%20mut%20%5BT%5D%3E
[lowercase]: https://doc.rust-lang.org/stable/std/char/struct.ToLowercase.html#impl-DoubleEndedIterator
[uppercase]: https://doc.rust-lang.org/stable/std/char/struct.ToUppercase.html#impl-DoubleEndedIterator
[try_from_char_err]: https://doc.rust-lang.org/stable/std/char/struct.TryFromCharError.html
[available_parallelism]: https://doc.rust-lang.org/stable/std/thread/fn.available_parallelism.html
[result-copied]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.copied
[result-cloned]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.cloned
[asm]: https://doc.rust-lang.org/stable/core/arch/macro.asm.html
[global_asm]: https://doc.rust-lang.org/stable/core/arch/macro.global_asm.html
[is_break]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_break
[is_continue]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_continue
[try_from_char_u8]: https://doc.rust-lang.org/stable/std/primitive.char.html#impl-TryFrom%3Cchar%3E
[zip]: https://doc.rust-lang.org/stable/std/iter/fn.zip.html
[is_power_of_two8]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU8.html#method.is_power_of_two
[is_power_of_two16]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU16.html#method.is_power_of_two
[is_power_of_two32]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU32.html#method.is_power_of_two
[is_power_of_two64]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU64.html#method.is_power_of_two
[is_power_of_two128]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU128.html#method.is_power_of_two
[stdarch/1266]: rust-lang/stdarch#1266
netbsd-srcmastr pushed a commit to NetBSD/pkgsrc that referenced this pull request Apr 15, 2022
Pkgsrc changes:
 * Bump available bootstraps to 1.58.1.
 * Adjust one patch (and checksum) so that it still applies.

Upstream changes:

Version 1.59.0 (2022-02-24)
==========================

Language
--------

- [Stabilize default arguments for const generics][90207]
- [Stabilize destructuring assignment][90521]
- [Relax private in public lint on generic bounds and where clauses
  of trait impls][90586]
- [Stabilize asm! and global_asm! for x86, x86_64, ARM, Aarch64,
  and RISC-V][91728]

Compiler
--------

- [Stabilize new symbol mangling format, leaving it opt-in
  (-Csymbol-mangling-version=v0)][90128]
- [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
- [Fix sparc64 ABI for aggregates with floating point members][91003]
- [Warn when a `#[test]`-like built-in attribute macro is present
  multiple times.][91172]
- [Add support for riscv64gc-unknown-freebsd][91284]
- [Stabilize `-Z emit-future-incompat` as `--json future-incompat`][91535]
- [Soft disable incremental compilation][94124]

This release disables incremental compilation, unless the user has explicitly
opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
This is due to a known and relatively frequently occurring bug in incremental
compilation, which causes builds to issue internal compiler errors. This
particular bug is already fixed on nightly, but that fix has not yet rolled out
to stable and is deemed too risky for a direct stable backport.

As always, we encourage users to test with nightly and report bugs so that we
can track failures and fix issues earlier.

See [94124] for more details.

[94124]: rust-lang/rust#94124

Libraries
---------

- [Remove unnecessary bounds for some Hash{Map,Set} methods][91593]

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

- [`std::thread::available_parallelism`][available_parallelism]
- [`Result::copied`][result-copied]
- [`Result::cloned`][result-cloned]
- [`arch::asm!`][asm]
- [`arch::global_asm!`][global_asm]
- [`ops::ControlFlow::is_break`][is_break]
- [`ops::ControlFlow::is_continue`][is_continue]
- [`TryFrom<char> for u8`][try_from_char_u8]
- [`char::TryFromCharError`][try_from_char_err]
  implementing `Clone`, `Debug`, `Display`, `PartialEq`, `Copy`, `Eq`, `Error`
- [`iter::zip`][zip]
- [`NonZeroU8::is_power_of_two`][is_power_of_two8]
- [`NonZeroU16::is_power_of_two`][is_power_of_two16]
- [`NonZeroU32::is_power_of_two`][is_power_of_two32]
- [`NonZeroU64::is_power_of_two`][is_power_of_two64]
- [`NonZeroU128::is_power_of_two`][is_power_of_two128]
- [`DoubleEndedIterator for ToLowercase`][lowercase]
- [`DoubleEndedIterator for ToUppercase`][uppercase]
- [`TryFrom<&mut [T]> for [T; N]`][tryfrom_ref_arr]
- [`UnwindSafe for Once`][unwindsafe_once]
- [`RefUnwindSafe for Once`][refunwindsafe_once]
- [armv8 neon intrinsics for aarch64][stdarch/1266]

Const-stable:

- [`mem::MaybeUninit::as_ptr`][muninit_ptr]
- [`mem::MaybeUninit::assume_init`][muninit_init]
- [`mem::MaybeUninit::assume_init_ref`][muninit_init_ref]
- [`ffi::CStr::from_bytes_with_nul_unchecked`][cstr_from_bytes]

Cargo
-----

- [Stabilize the `strip` profile option][cargo/10088]
- [Stabilize future-incompat-report][cargo/10165]
- [Support abbreviating `--release` as `-r`][cargo/10133]
- [Support `term.quiet` configuration][cargo/10152]
- [Remove `--host` from cargo {publish,search,login}][cargo/10145]

Compatibility Notes
-------------------

- [Refactor weak symbols in std::sys::unix][90846]
  This may add new, versioned, symbols when building with a newer glibc, as the
  standard library uses weak linkage rather than dynamically attempting to load
  certain symbols at runtime.
- [Deprecate crate_type and crate_name nested inside `#![cfg_attr]`][83744]
  This adds a future compatibility lint to supporting the use of cfg_attr
  wrapping either crate_type or crate_name specification within Rust files;
  it is recommended that users migrate to setting the equivalent command line
  flags.
- [Remove effect of `#[no_link]` attribute on name resolution][92034]
  This may expose new names, leading to conflicts with preexisting names in a
  given namespace and a compilation failure.
- [Cargo will document libraries before binaries.][cargo/10172]
- [Respect doc=false in dependencies, not just the root crate][cargo/10201]
- [Weaken guarantee around advancing underlying iterators in zip][83791]
- [Make split_inclusive() on an empty slice yield an empty output][89825]
- [Update std::env::temp_dir to use GetTempPath2 on Windows when
  available.][89999]
- [unreachable! was updated to match other formatting macro behavior
  on Rust 2021][92137]

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.

- [Fix many cases of normalization-related ICEs][91255]
- [Replace dominators algorithm with simple Lengauer-Tarjan][85013]
- [Store liveness in interval sets for region inference][90637]

- [Remove `in_band_lifetimes` from the compiler and standard library,
  in preparation for removing this unstable feature.][91867]

[91867]: rust-lang/rust#91867
[83744]: rust-lang/rust#83744
[83791]: rust-lang/rust#83791
[85013]: rust-lang/rust#85013
[89825]: rust-lang/rust#89825
[89999]: rust-lang/rust#89999
[90128]: rust-lang/rust#90128
[90207]: rust-lang/rust#90207
[90521]: rust-lang/rust#90521
[90586]: rust-lang/rust#90586
[90637]: rust-lang/rust#90637
[90833]: rust-lang/rust#90833
[90846]: rust-lang/rust#90846
[91003]: rust-lang/rust#91003
[91172]: rust-lang/rust#91172
[91255]: rust-lang/rust#91255
[91284]: rust-lang/rust#91284
[91535]: rust-lang/rust#91535
[91593]: rust-lang/rust#91593
[91728]: rust-lang/rust#91728
[91878]: rust-lang/rust#91878
[91896]: rust-lang/rust#91896
[91926]: rust-lang/rust#91926
[91984]: rust-lang/rust#91984
[92020]: rust-lang/rust#92020
[92034]: rust-lang/rust#92034
[92483]: rust-lang/rust#92483
[cargo/10088]: rust-lang/cargo#10088
[cargo/10133]: rust-lang/cargo#10133
[cargo/10145]: rust-lang/cargo#10145
[cargo/10152]: rust-lang/cargo#10152
[cargo/10165]: rust-lang/cargo#10165
[cargo/10172]: rust-lang/cargo#10172
[cargo/10201]: rust-lang/cargo#10201
[cargo/10269]: rust-lang/cargo#10269

[cstr_from_bytes]: https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked
[muninit_ptr]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
[muninit_init]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
[muninit_init_ref]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
[unwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-UnwindSafe
[refunwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-RefUnwindSafe
[tryfrom_ref_arr]: https://doc.rust-lang.org/stable/std/convert/trait.TryFrom.html#impl-TryFrom%3C%26%27_%20mut%20%5BT%5D%3E
[lowercase]: https://doc.rust-lang.org/stable/std/char/struct.ToLowercase.html#impl-DoubleEndedIterator
[uppercase]: https://doc.rust-lang.org/stable/std/char/struct.ToUppercase.html#impl-DoubleEndedIterator
[try_from_char_err]: https://doc.rust-lang.org/stable/std/char/struct.TryFromCharError.html
[available_parallelism]: https://doc.rust-lang.org/stable/std/thread/fn.available_parallelism.html
[result-copied]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.copied
[result-cloned]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.cloned
[asm]: https://doc.rust-lang.org/stable/core/arch/macro.asm.html
[global_asm]: https://doc.rust-lang.org/stable/core/arch/macro.global_asm.html
[is_break]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_break
[is_continue]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_continue
[try_from_char_u8]: https://doc.rust-lang.org/stable/std/primitive.char.html#impl-TryFrom%3Cchar%3E
[zip]: https://doc.rust-lang.org/stable/std/iter/fn.zip.html
[is_power_of_two8]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU8.html#method.is_power_of_two
[is_power_of_two16]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU16.html#method.is_power_of_two
[is_power_of_two32]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU32.html#method.is_power_of_two
[is_power_of_two64]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU64.html#method.is_power_of_two
[is_power_of_two128]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU128.html#method.is_power_of_two
[stdarch/1266]: rust-lang/stdarch#1266
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