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Rollup of 3 pull requests#152386

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JonathanBrouwer wants to merge 10 commits intorust-lang:mainfrom
JonathanBrouwer:rollup-MVOxzE2
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Rollup of 3 pull requests#152386
JonathanBrouwer wants to merge 10 commits intorust-lang:mainfrom
JonathanBrouwer:rollup-MVOxzE2

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Successful merges:

r? @ghost

Create a similar rollup

cuviper and others added 10 commits January 24, 2026 11:06
The derived `T: Copy` constraint is not appropriate for an iterator by
reference, but we generally do not want `Copy` on iterators anyway.
This implementation doesn't need the derived `T: Clone`.
- `impl<T, const N: usize> From<[MaybeUninit<T>; N]> for MaybeUninit<[T; N]>`
- `impl<T, const N: usize> AsRef<[MaybeUninit<T>; N]> for MaybeUninit<[T; N]>`
- `impl<T, const N: usize> AsRef<[MaybeUninit<T>]> for MaybeUninit<[T; N]>`
- `impl<T, const N: usize> AsMut<[MaybeUninit<T>; N]> for MaybeUninit<[T; N]>`
- `impl<T, const N: usize> AsMut<[MaybeUninit<T>]> for MaybeUninit<[T; N]>`
- `impl<T, const N: usize> From<MaybeUninit<[T; N]>> for [MaybeUninit<T>; N]`
- `impl<T, const N: usize> AsRef<[Cell<T>; N]> for Cell<[T; N]>`
- `impl<T, const N: usize> AsRef<[Cell<T>]> for Cell<[T; N]>`
- `impl<T> AsRef<[Cell<T>]> for Cell<[T]>`
…anieu

Align `ArrayWindows` trait impls with `Windows`

With `slice::ArrayWindows` getting ready to stabilize in 1.94, I noticed that it currently has some differences in trait implementations compared to `slice::Windows`, and I think we should align these.

- Remove `derive(Copy)` -- we generally don't want `Copy` for iterators at all, as this is seen as a footgun (e.g. rust-lang#21809). This is obviously a breaking change though, so we should only remove this if we also backport the removal before it's stable. Otherwise, it should at least be replaced by a manual impl without requiring `T: Copy`.
- Manually `impl Clone`, simply to avoid requiring `T: Clone`.
- `impl FusedIterator`, because it is trivially so. The `since = "1.94.0"` assumes we'll backport this, otherwise we should change that to the "current" placeholder.
- `impl TrustedLen`, because we can trust our implementation.
- `impl TrustedRandomAccess`, because the required `__iterator_get_unchecked` method is straightforward.

r? libs-api

@rustbot label beta-nominated
(at least for the `Copy` removal, but we could be more selective about the rest).
std: introduce path normalize methods at top of `std::path`

Closes rust-lang#142931

Mention other methods that call `conponents` and `canonicalize` that fully normalize path. And fix two typo.

r? libs
…ait_impls, r=tgross35

Add some conversion trait impls

- `impl<T, const N: usize> From<[MaybeUninit<T>; N]> for MaybeUninit<[T; N]>` (cc rust-lang#96097)
- `impl<T, const N: usize> AsRef<[MaybeUninit<T>; N]> for MaybeUninit<[T; N]>` (cc rust-lang#96097)
- `impl<T, const N: usize> AsRef<[MaybeUninit<T>]> for MaybeUninit<[T; N]>` (cc rust-lang#96097)
- `impl<T, const N: usize> AsMut<[MaybeUninit<T>; N]> for MaybeUninit<[T; N]>` (cc rust-lang#96097)
- `impl<T, const N: usize> AsMut<[MaybeUninit<T>]> for MaybeUninit<[T; N]>` (cc rust-lang#96097)
- `impl<T, const N: usize> From<MaybeUninit<[T; N]>> for [MaybeUninit<T>; N]` (cc rust-lang#96097)
- `impl<T, const N: usize> AsRef<[Cell<T>; N]> for Cell<[T; N]>` (equivalent of `as_array_of_cells`, cc rust-lang#88248)
- `impl<T, const N: usize> AsRef<[Cell<T>]> for Cell<[T; N]>`
- `impl<T> AsRef<[Cell<T>]> for Cell<[T]>` (equivalent of `as_slice_of_cells`)

@rustbot label T-libs-api needs-fcp -T-libs

I’ve tried to only add impls that are unlikely to cause single-applicable-impl inference breakage.
@rust-bors rust-bors bot added the rollup A PR which is a rollup label Feb 9, 2026
@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Feb 9, 2026
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@bors r+ rollup=never p=5

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rust-bors bot commented Feb 9, 2026

📌 Commit f955ab5 has been approved by JonathanBrouwer

It is now in the queue for this repository.

@rust-bors rust-bors bot 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 9, 2026
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5 participants