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Implement FusedIterator for DecodeUtf16 when the inner iterator does #110729

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merged 1 commit into from
Oct 15, 2023

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@ColinFinck ColinFinck commented Apr 23, 2023

I have just implemented an iterator that wraps DecodeUtf16 and wanted to implement FusedIterator for my iterator when I noticed that DecodeUtf16 currently doesn't implement FusedIterator at all.
A quick look at the code of DecodeUtf16 revealed that DecodeUtf16::next only returns None when its inner iterator returns None:

None => self.iter.next()?,

As a result, we can implement FusedIterator for DecodeUtf16 when the inner iterator does.

I'm following the example of #96397 here and consider this change minor and non-controversial, which is why I haven't added an RFC. I have also added the required feature name ("decode_utf16_fused_iterator"), however without adding a chapter to the Rust Unstable book (same as #96397).

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r? @joshtriplett

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@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Apr 23, 2023
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Hey! It looks like you've submitted a new PR for the library teams!

If this PR contains changes to any rust-lang/rust public library APIs then please comment with @rustbot label +T-libs-api -T-libs to tag it appropriately. If this PR contains changes to any unstable APIs please edit the PR description to add a link to the relevant API Change Proposal or create one if you haven't already. If you're unsure where your change falls no worries, just leave it as is and the reviewer will take a look and make a decision to forward on if necessary.

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@cuviper cuviper added T-libs-api Relevant to the library API team, which will review and decide on the PR/issue. and removed T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Apr 24, 2023
@workingjubilee workingjubilee added the needs-fcp This change is insta-stable, so needs a completed FCP to proceed. label Jul 31, 2023
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r? libs-api

Needs FCP for a "passthrough" impl of impl<T> FusedIterator for DecodeUtf16<T> where T: FusedIterator. Seems unobjectionable.

@rustbot rustbot assigned m-ou-se and unassigned joshtriplett Jul 31, 2023
@dtolnay dtolnay assigned dtolnay and unassigned m-ou-se Sep 28, 2023
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dtolnay commented Sep 28, 2023

@rust-lang/libs-api:
@rfcbot fcp merge

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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 Sep 28, 2023
@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 Oct 5, 2023
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🔔 This is now entering its final comment period, as per the review above. 🔔

@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 Oct 15, 2023
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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.

@rfcbot rfcbot added the to-announce Announce this issue on triage meeting label Oct 15, 2023
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Thanks!

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dtolnay commented Oct 15, 2023

@bors r+

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bors commented Oct 15, 2023

📌 Commit 60fd119 has been approved by dtolnay

It is now in the queue for this repository.

@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 Oct 15, 2023
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bors commented Oct 15, 2023

⌛ Testing commit 60fd119 with merge 64368d0...

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bors commented Oct 15, 2023

☀️ Test successful - checks-actions
Approved by: dtolnay
Pushing 64368d0 to master...

@bors bors added the merged-by-bors This PR was explicitly merged by bors. label Oct 15, 2023
@bors bors merged commit 64368d0 into rust-lang:master Oct 15, 2023
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@rustbot rustbot added this to the 1.75.0 milestone Oct 15, 2023
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Finished benchmarking commit (64368d0): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

mean range count
Regressions ❌
(primary)
- - 0
Regressions ❌
(secondary)
- - 0
Improvements ✅
(primary)
- - 0
Improvements ✅
(secondary)
-3.0% [-3.7%, -2.6%] 3
All ❌✅ (primary) - - 0

Cycles

This benchmark run did not return any relevant results for this metric.

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 624.98s -> 625.359s (0.06%)
Artifact size: 305.53 MiB -> 305.52 MiB (-0.00%)

bors-ferrocene bot added a commit to ferrocene/ferrocene that referenced this pull request Oct 17, 2023
54: Pull upstream master 2023 10 17 r=pietroalbini a=Veykril

* rust-lang/rust#116196
* rust-lang/rust#116824
* rust-lang/rust#116822
* rust-lang/rust#116477
* rust-lang/rust#116826
* rust-lang/rust#116820
  * rust-lang/rust#116811
  * rust-lang/rust#116808
  * rust-lang/rust#116805
  * rust-lang/rust#116800
  * rust-lang/rust#116798
  * rust-lang/rust#116754
* rust-lang/rust#114370
* rust-lang/rust#116804
  * rust-lang/rust#116802
  * rust-lang/rust#116790
  * rust-lang/rust#116786
  * rust-lang/rust#116709
  * rust-lang/rust#116430
  * rust-lang/rust#116257
  * rust-lang/rust#114157
* rust-lang/rust#116731
* rust-lang/rust#116550
* rust-lang/rust#114330
* rust-lang/rust#116724
* rust-lang/rust#116782
  * rust-lang/rust#116776
  * rust-lang/rust#115955
  * rust-lang/rust#115196
* rust-lang/rust#116775
* rust-lang/rust#114589
* rust-lang/rust#113747
* rust-lang/rust#116772
  * rust-lang/rust#116771
  * rust-lang/rust#116760
  * rust-lang/rust#116755
  * rust-lang/rust#116732
  * rust-lang/rust#116522
  * rust-lang/rust#116341
  * rust-lang/rust#116172
* rust-lang/rust#110604
* rust-lang/rust#110729
* rust-lang/rust#116527
* rust-lang/rust#116688
* rust-lang/rust#116757
  * rust-lang/rust#116753
  * rust-lang/rust#116748
  * rust-lang/rust#116741
  * rust-lang/rust#116594
* rust-lang/rust#116691
* rust-lang/rust#116643
* rust-lang/rust#116683
* rust-lang/rust#116635
* rust-lang/rust#115515
* rust-lang/rust#116742
  * rust-lang/rust#116661
  * rust-lang/rust#116576
  * rust-lang/rust#116540
* rust-lang/rust#116352
* rust-lang/rust#116737
  * rust-lang/rust#116730
  * rust-lang/rust#116723
  * rust-lang/rust#116715
  * rust-lang/rust#116603
  * rust-lang/rust#116591
  * rust-lang/rust#115439
* rust-lang/rust#116264
* rust-lang/rust#116727
  * rust-lang/rust#116704
  * rust-lang/rust#116696
  * rust-lang/rust#116695
  * rust-lang/rust#116644
  * rust-lang/rust#116630
* rust-lang/rust#116728
  * rust-lang/rust#116689
  * rust-lang/rust#116679
  * rust-lang/rust#116618
  * rust-lang/rust#116577
  * rust-lang/rust#115653
* rust-lang/rust#116702
* rust-lang/rust#116015
* rust-lang/rust#115822
* rust-lang/rust#116407
* rust-lang/rust#115719
* rust-lang/rust#115524
* rust-lang/rust#116705
* rust-lang/rust#116645
* rust-lang/rust#116233
* rust-lang/rust#115108
* rust-lang/rust#116670
* rust-lang/rust#116676
* rust-lang/rust#116666



Co-authored-by: Benoît du Garreau <bdgdlm@outlook.com>
Co-authored-by: Colin Finck <colin@reactos.org>
Co-authored-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
Co-authored-by: Joshua Liebow-Feeser <joshlf@users.noreply.github.com>
Co-authored-by: León Orell Valerian Liehr <me@fmease.dev>
Co-authored-by: Trevor Gross <tmgross@umich.edu>
Co-authored-by: Evan Merlock <evan@merlock.dev>
Co-authored-by: joboet <jonasboettiger@icloud.com>
Co-authored-by: Ralf Jung <post@ralfj.de>
Co-authored-by: DaniPopes <57450786+DaniPopes@users.noreply.github.com>
Co-authored-by: Mark Rousskov <mark.simulacrum@gmail.com>
Co-authored-by: onur-ozkan <work@onurozkan.dev>
Co-authored-by: Nicholas Nethercote <n.nethercote@gmail.com>
Co-authored-by: The 8472 <git@infinite-source.de>
Co-authored-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Co-authored-by: reez12g <reez12g@gmail.com>
Co-authored-by: Jakub Beránek <berykubik@gmail.com>
@apiraino apiraino removed the to-announce Announce this issue on triage meeting label Oct 19, 2023
netbsd-srcmastr pushed a commit to NetBSD/pkgsrc that referenced this pull request Mar 3, 2024
Pkgsrc changes:
 * Adjust patches and cargo checksums to new versions.
 * For an external LLVM, set dependency of llvm >= 16, in accordance
   with the upstream changes.
 * Mark that on NetBSD we now need >= 9.0, so 8.x is no longer supported.
 * On NetBSD/sparc64 10.x, we now need GCC 12 to build the embedded
   LLVM, which is version 17; apparently GCC 10.4 or 10.5 mis-compiles it,
   resulting in an illegal instruction fault during the build.
   Ref. rust-lang/rust#117231

Upstream changes:

Version 1.75.0 (2023-12-28)
==========================

- [Stabilize `async fn` and return-position `impl Trait` in traits.]
  (rust-lang/rust#115822)
- [Allow function pointer signatures containing `&mut T` in `const` contexts.]
  (rust-lang/rust#116015)
- [Match `usize`/`isize` exhaustively with half-open ranges.]
  (rust-lang/rust#116692)
- [Guarantee that `char` has the same size and alignment as `u32`.]
  (rust-lang/rust#116894)
- [Document that the null pointer has the 0 address.]
  (rust-lang/rust#116988)
- [Allow partially moved values in `match`.]
  (rust-lang/rust#103208)
- [Add notes about non-compliant FP behavior on 32bit x86 targets.]
  (rust-lang/rust#113053)
- [Stabilize ratified RISC-V target features.]
  (rust-lang/rust#116485)

Compiler
--------

- [Rework negative coherence to properly consider impls that only
  partly overlap.] (rust-lang/rust#112875)
- [Bump `COINDUCTIVE_OVERLAP_IN_COHERENCE` to deny, and warn in dependencies.]
  (rust-lang/rust#116493)
- [Consider alias bounds when computing liveness in NLL.]
  (rust-lang/rust#116733)
- [Add the V (vector) extension to the `riscv64-linux-android` target spec.]
  (rust-lang/rust#116618)
- [Automatically enable cross-crate inlining for small functions]
  (rust-lang/rust#116505)
- Add several new tier 3 targets:
    - [`csky-unknown-linux-gnuabiv2hf`]
      (rust-lang/rust#117049)
    - [`i586-unknown-netbsd`]
      (rust-lang/rust#117170)
    - [`mipsel-unknown-netbsd`]
      (rust-lang/rust#117356)

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

Libraries
---------

- [Override `Waker::clone_from` to avoid cloning `Waker`s unnecessarily.]
  (rust-lang/rust#96979)
- [Implement `BufRead` for `VecDeque<u8>`.]
  (rust-lang/rust#110604)
- [Implement `FusedIterator` for `DecodeUtf16` when the inner iterator does.]
  (rust-lang/rust#110729)
- [Implement `Not, Bit{And,Or}{,Assign}` for IP addresses.]
  (rust-lang/rust#113747)
- [Implement `Default` for `ExitCode`.]
  (rust-lang/rust#114589)
- [Guarantee representation of None in NPO]
  (rust-lang/rust#115333)
- [Document when atomic loads are guaranteed read-only.]
  (rust-lang/rust#115577)
- [Broaden the consequences of recursive TLS initialization.]
  (rust-lang/rust#116172)
- [Windows: Support sub-millisecond sleep.]
  (rust-lang/rust#116461)
- [Fix generic bound of `str::SplitInclusive`'s `DoubleEndedIterator` impl]
  (rust-lang/rust#100806)
- [Fix exit status / wait status on non-Unix `cfg(unix)` platforms.]
  (rust-lang/rust#115108)

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

- [`Atomic*::from_ptr`]
  (https://doc.rust-lang.org/stable/core/sync/atomic/struct.AtomicUsize.html#method.from_ptr)
- [`FileTimes`]
  (https://doc.rust-lang.org/stable/std/fs/struct.FileTimes.html)
- [`FileTimesExt`]
  (https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTimesExt.html)
- [`File::set_modified`]
  (https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.set_modified)
- [`File::set_times`]
  (https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.set_times)
- [`IpAddr::to_canonical`]
  (https://doc.rust-lang.org/stable/core/net/enum.IpAddr.html#method.to_canonical)
- [`Ipv6Addr::to_canonical`]
  (https://doc.rust-lang.org/stable/core/net/struct.Ipv6Addr.html#method.to_canonical)
- [`Option::as_slice`]
  (https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.as_slice)
- [`Option::as_mut_slice`]
  (https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.as_mut_slice)
- [`pointer::byte_add`]
  (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.byte_add)
- [`pointer::byte_offset`]
  (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.byte_offset)
- [`pointer::byte_offset_from`]
  (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.byte_offset_from)
- [`pointer::byte_sub`]
  (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.byte_sub)
- [`pointer::wrapping_byte_add`]
  (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.wrapping_byte_add)
- [`pointer::wrapping_byte_offset`]
  (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.wrapping_byte_offset)
- [`pointer::wrapping_byte_sub`]
  (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.wrapping_byte_sub)

These APIs are now stable in const contexts:

- [`Ipv6Addr::to_ipv4_mapped`]
  (https://doc.rust-lang.org/stable/core/net/struct.Ipv6Addr.html#method.to_ipv4_mapped)
- [`MaybeUninit::assume_init_read`]
  (https://doc.rust-lang.org/stable/core/mem/union.MaybeUninit.html#method.assume_init_read)
- [`MaybeUninit::zeroed`]
  (https://doc.rust-lang.org/stable/core/mem/union.MaybeUninit.html#method.zeroed)
- [`mem::discriminant`]
  (https://doc.rust-lang.org/stable/core/mem/fn.discriminant.html)
- [`mem::zeroed`]
  (https://doc.rust-lang.org/stable/core/mem/fn.zeroed.html)

Cargo
-----

- [Add new packages to `[workspace.members]` automatically.]
  (rust-lang/cargo#12779)
- [Allow version-less `Cargo.toml` manifests.]
  (rust-lang/cargo#12786)
- [Make browser links out of HTML file paths.]
  (rust-lang/cargo#12889)

Rustdoc
-------

- [Accept less invalid Rust in rustdoc.]
  (rust-lang/rust#117450)
- [Document lack of object safety on affected traits.]
  (rust-lang/rust#113241)
- [Hide `#[repr(transparent)]` if it isn't part of the public ABI.]
  (rust-lang/rust#115439)
- [Show enum discriminant if it is a C-like variant.]
  (rust-lang/rust#116142)

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

- [FreeBSD targets now require at least version 12.]
  (rust-lang/rust#114521)
- [Formally demote tier 2 MIPS targets to tier 3.]
  (rust-lang/rust#115238)
- [Make misalignment a hard error in `const` contexts.]
  (rust-lang/rust#115524)
- [Fix detecting references to packed unsized fields.]
  (rust-lang/rust#115583)
- [Remove support for compiler plugins.]
  (rust-lang/rust#116412)
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