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impl AsRef<[T]> for vec::IntoIter<T> #72583

Merged
merged 1 commit into from
Jun 8, 2020
Merged

impl AsRef<[T]> for vec::IntoIter<T> #72583

merged 1 commit into from
Jun 8, 2020

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CAD97
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@CAD97 CAD97 commented May 25, 2020

Adds impl<T> AsRef<[T]> for vec::IntoIter<T>. This mirrors the same trait impl for slice::Iter. Both types already offer fn as_slice(&self) -> &[T], this just adds the trait impl for vec::IntoIter.

If/when fn as_slice(&self) -> &[T] stabilizes for vec::Drain and slice::IterMut, they should get AsRef<[T]> impls as well. As thus, tangentially related to #58957.

My ultimate goal here: being able to use for<T, I: Iterator<Item=T> + AsRef<[T]>> I to refer to vec::IntoIter, vec::Drain, and eventually array::IntoIter, as an approximation of the set of by-value iterators that can be "previewed" as by-ref iterators. (Actually expressing that as a trait requires GAT.)

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r? @shepmaster

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@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label May 25, 2020
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CAD97 commented May 25, 2020

Marked as stable in 1.46 as trait impls are insta-stable and with FCP this will definitely miss the 1.45 beta cutoff.

@jonas-schievink jonas-schievink added relnotes Marks issues that should be documented in the release notes of the next release. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue. labels May 25, 2020
@jonas-schievink jonas-schievink added this to the 1.45 milestone May 25, 2020
@CAD97 CAD97 mentioned this pull request May 25, 2020
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dtolnay commented May 28, 2020

@rust-lang/libs: this adds impl<T> AsRef<[T]> for std::vec::IntoIter<T> exposing the same behavior as the long-stable https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice.

@rfcbot fcp merge

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rfcbot commented May 28, 2020 •
edited by sfackler
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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 May 28, 2020
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CAD97 commented May 28, 2020

RefMut<[T]> could also be provided for as_mut_slice, but there's not precedent for providing that trait on slice iterators. (slice::IterMut also doesn't provide as_slice/AsRef<[T]> on stable yet.) I've kept this PR to just be AsRef<[T]> to keep it to aligning with existing precedent (on slice::Iter).

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rfcbot commented May 28, 2020

🔔 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 May 28, 2020
@crlf0710 crlf0710 added S-waiting-on-fcp Status: PR is in FCP and is awaiting for FCP to complete. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jun 5, 2020
@rfcbot rfcbot added the finished-final-comment-period The final comment period is finished for this PR / Issue. label Jun 7, 2020
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rfcbot commented Jun 7, 2020

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.

The RFC will be merged soon.

@rfcbot rfcbot removed the final-comment-period In the final comment period and will be merged soon unless new substantive objections are raised. label Jun 7, 2020
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dtolnay commented Jun 8, 2020

@bors r+

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bors commented Jun 8, 2020

📌 Commit 91f52a5 has been approved by dtolnay

@bors bors added the S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. label Jun 8, 2020
@dtolnay dtolnay assigned dtolnay and unassigned shepmaster Jun 8, 2020
@RalfJung RalfJung mentioned this pull request Jun 8, 2020
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bors added a commit to rust-lang-ci/rust that referenced this pull request Jun 8, 2020
@bors
Auto merge of rust-lang#73115 - RalfJung:rollup-jecowhz, r=RalfJung
bc10b68 
Rollup of 10 pull requests

Successful merges:

 - rust-lang#72026 (Update annotate-snippets-rs to 0.8.0)
 - rust-lang#72583 (impl AsRef<[T]> for vec::IntoIter<T>)
 - rust-lang#72615 (Fix documentation example for gcov profiling)
 - rust-lang#72761 (Added the documentation for the 'use' keyword)
 - rust-lang#72799 (Add `-Z span-debug` to allow for easier debugging of proc macros)
 - rust-lang#72811 (Liballoc impl)
 - rust-lang#72963 (Cstring `from_raw` and `into_raw` safety precisions)
 - rust-lang#73001 (Free `default()` forwarding to `Default::default()`)
 - rust-lang#73075 (Add comments to `Resolve::get_module`)
 - rust-lang#73092 (Clean up E0646)

Failed merges:

r? @ghost
@bors bors merged commit b0559be into rust-lang:master Jun 8, 2020
@CAD97 CAD97 deleted the vec-iter-asref-slice branch June 8, 2020 21:42
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jplatte commented Jun 18, 2020

Milestone is incorrect, should be 1.46.

netbsd-srcmastr pushed a commit to NetBSD/pkgsrc that referenced this pull request Aug 30, 2020
@alarixnia
rust-bin: Update to 1.46.0
6813886 
according to various people on tech-pkg@, there are no problems with
the Firefox build

Version 1.46.0 (2020-08-27)
==========================

Language
--------
- [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
- [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
  const functions.][73862]
- [The `#[track_caller]` attribute can now be added to functions to use the
  function's caller's location information for panic messages.][72445]
- [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
  `x.0.0` over `(x.0).0`.
- [`mem::transmute` can now be used in static and constants.][72920] **Note**
  You currently can't use `mem::transmute` in constant functions.

Compiler
--------
- [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
- [Enabled static "Position Independent Executables" by default
  for `x86_64-unknown-linux-musl`.][70740]

Libraries
---------
- [`mem::forget` is now a `const fn`.][73887]
- [`String` now implements `From<char>`.][73466]
- [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
  integer types.][73032]
- [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
- [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
  zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
- [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
- [`(String, u16)` now implements `ToSocketAddrs`.][73007]
- [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]

Stabilized APIs
---------------
- [`Option::zip`]
- [`vec::Drain::as_slice`]

Cargo
-----
Added a number of new environment variables that are now available when
compiling your crate.

- [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
  the specific binary being compiled and the name of the crate.
- [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
- [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.

Compatibility Notes
-------------------
- [The target configuration option `abi_blacklist` has been renamed
  to `unsupported_abis`.][74150] The old name will still continue to work.
- [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
  This was previously accepted but will become a hard error in a future release.
- [Rustc will fail to compile if you have a struct with
  `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
  allowed on `enum`s.
- [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
  ensure that spans have the correct information, and may cause breakage if you
  were relying on receiving spans with dummy information.
- [The InnoSetup installer for Windows is no longer available.][72569] This was
  a legacy installer that was replaced by a MSI installer a few years ago but
  was still being built.
- [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
- [Rustc will no longer accept overlapping trait implementations that only
  differ in how the lifetime was bound.][72493]
- [Rustc now correctly relates the lifetime of an existential associated
  type.][71896] This fixes some edge cases where `rustc` would erroneously allow
  you to pass a shorter lifetime than expected.
- [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
  The library will need to be installed for `rustc` to work, even though we
  expect it to be already available on most systems.
- [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
  under QEMU.][74820]
- [Pretty printing of some tokens in procedural macros changed.][75453] The
  exact output returned by rustc's pretty printing is an unstable
  implementation detail: we recommend any macro relying on it to switch to a
  more robust parsing system.

[75453]: rust-lang/rust#75453
[74820]: rust-lang/rust#74820
[74420]: rust-lang/rust#74420
[74109]: rust-lang/rust#74109
[74150]: rust-lang/rust#74150
[73862]: rust-lang/rust#73862
[73887]: rust-lang/rust#73887
[73466]: rust-lang/rust#73466
[73516]: rust-lang/rust#73516
[73293]: rust-lang/rust#73293
[73007]: rust-lang/rust#73007
[73032]: rust-lang/rust#73032
[72920]: rust-lang/rust#72920
[72569]: rust-lang/rust#72569
[72583]: rust-lang/rust#72583
[72584]: rust-lang/rust#72584
[72717]: rust-lang/rust#72717
[72437]: rust-lang/rust#72437
[72445]: rust-lang/rust#72445
[72486]: rust-lang/rust#72486
[72493]: rust-lang/rust#72493
[72331]: rust-lang/rust#72331
[71896]: rust-lang/rust#71896
[71660]: rust-lang/rust#71660
[71322]: rust-lang/rust#71322
[70740]: rust-lang/rust#70740
[cargo/8270]: rust-lang/cargo#8270
[cargo/8325]: rust-lang/cargo#8325
[cargo/8387]: rust-lang/cargo#8387
[`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
[`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
netbsd-srcmastr pushed a commit to NetBSD/pkgsrc that referenced this pull request Oct 30, 2020
@he32
Upgrade rust to version 1.46.0.
1b4b558 
Pkgsrc changes:
 * Portability patches for Illumos have been intregrated upstream,
   so are no longer needed in pkgsrc.
 * Adjust one other patch, and update vendor/libc cargo checksum.

Upstream changes:

Version 1.46.0 (2020-08-27)
==========================

Language
--------
- [`if`, `match`, and `loop` expressions can now be used in const functions.]
  [72437]
- [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
  const functions.][73862]
- [The `#[track_caller]` attribute can now be added to functions to use the
  function's caller's location information for panic messages.][72445]
- [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
  `x.0.0` over `(x.0).0`.
- [`mem::transmute` can now be used in static and constants.][72920] **Note**
  You currently can't use `mem::transmute` in constant functions.

Compiler
--------
- [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
- [Enabled static "Position Independent Executables" by default
  for `x86_64-unknown-linux-musl`.][70740]

Libraries
---------
- [`mem::forget` is now a `const fn`.][73887]
- [`String` now implements `From<char>`.][73466]
- [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
  integer types.][73032]
- [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
- [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
  zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
- [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
- [`(String, u16)` now implements `ToSocketAddrs`.][73007]
- [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]

Stabilized APIs
---------------
- [`Option::zip`]
- [`vec::Drain::as_slice`]

Cargo
-----
Added a number of new environment variables that are now available when
compiling your crate.

- [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
  the specific binary being compiled and the name of the crate.
- [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the
  package.
- [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.

Compatibility Notes
-------------------
- [The target configuration option `abi_blacklist` has been renamed
  to `unsupported_abis`.][74150] The old name will still continue to work.
- [Rustc will now warn if you have a C-like enum that implements `Drop`.][72331]
  This was previously accepted but will become a hard error in a future release.
- [Rustc will fail to compile if you have a struct with
  `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently
  only allowed on `enum`s.
- [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
  ensure that spans have the correct information, and may cause breakage if you
  were relying on receiving spans with dummy information.
- [The InnoSetup installer for Windows is no longer available.][72569] This was
  a legacy installer that was replaced by a MSI installer a few years ago but
  was still being built.
- [`{f32, f64}::asinh` now returns the correct values for negative numbers.]
  [72486]
- [Rustc will no longer accept overlapping trait implementations that only
  differ in how the lifetime was bound.][72493]
- [Rustc now correctly relates the lifetime of an existential associated
  type.][71896] This fixes some edge cases where `rustc` would erroneously
  allow you to pass a shorter lifetime than expected.
- [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
  The library will need to be installed for `rustc` to work, even though we
  expect it to be already available on most systems.
- [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
  under QEMU.][74820]
- [Pretty printing of some tokens in procedural macros changed.][75453] The
  exact output returned by rustc's pretty printing is an unstable
  implementation detail: we recommend any macro relying on it to switch to a
  more robust parsing system.

[75453]: rust-lang/rust#75453
[74820]: rust-lang/rust#74820
[74420]: rust-lang/rust#74420
[74109]: rust-lang/rust#74109
[74150]: rust-lang/rust#74150
[73862]: rust-lang/rust#73862
[73887]: rust-lang/rust#73887
[73466]: rust-lang/rust#73466
[73516]: rust-lang/rust#73516
[73293]: rust-lang/rust#73293
[73007]: rust-lang/rust#73007
[73032]: rust-lang/rust#73032
[72920]: rust-lang/rust#72920
[72569]: rust-lang/rust#72569
[72583]: rust-lang/rust#72583
[72584]: rust-lang/rust#72584
[72717]: rust-lang/rust#72717
[72437]: rust-lang/rust#72437
[72445]: rust-lang/rust#72445
[72486]: rust-lang/rust#72486
[72493]: rust-lang/rust#72493
[72331]: rust-lang/rust#72331
[71896]: rust-lang/rust#71896
[71660]: rust-lang/rust#71660
[71322]: rust-lang/rust#71322
[70740]: rust-lang/rust#70740
[cargo/8270]: rust-lang/cargo#8270
[cargo/8325]: rust-lang/cargo#8325
[cargo/8387]: rust-lang/cargo#8387
[`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
[`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
@lopopolo lopopolo mentioned this pull request Dec 14, 2020
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