Auto merge of #148157 - nnethercote:undo-chain, r=saethlin

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Adjust successor iterators.

Because rust-lang/rust#148054 was a slight perf regression.

The problem was seemingly because this iterator structure:
```
slice_iter.chain(Option_iter.chain(Option_iter))
```
changed to this:
```
slice_iter.chain(Option_iter).chain(Option_iter)
```
The commit also tweaks the `slice_iter` part, changing `into_iter` to `iter` and using `[]` instead of `(&[])`, for conciseness and consistency.

r? `@saethlin`

...

This commit is contained in:

bors 2025-10-31 05:12:24 +00:00

parent fec84fbdf3 36b7816e49

commit 0efb2e9291

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