Josh Stone a66b7810c3 impl Default for RepeatN ...

This creates an empty iterator, like `repeat_n(value, 0)` but without
needing any such value at hand. There's precedent in many other
iterators that the `Default` is empty, like `slice::Iter`.

I found myself wanting this for rayon's `RepeatN` as it lowers to a
sequential iterator [here][1]. Since rayon is also optimizing to avoid
extra clones, it may end up with parallel splits that have count 0 and
no item value. Calling `std::iter::repeat_n(x, 0)` just drops that
value, but there's no way to construct the same result without a value
yet. This would be straightforward with an empty `Default`.

[1]: https://github.com/rayon-rs/rayon/blob/ae07384e3e0b238cea89f0c14891f351c65a5cee/src/iter/repeat.rs#L201-L202

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..

adapters

Rollup merge of #154190 - Jules-Bertholet:nonfused, r=scottmcm

2026-03-29 08:59:36 +02:00

traits

Rollup merge of #138799 - joboet:extend-tuple, r=Mark-Simulacrum

2025-10-12 10:13:12 +02:00

mod.rs

constify Iterator

2026-01-30 15:52:40 +00:00

range.rs

feat(core): impl Step for NonZero<u*>

2026-04-03 13:25:13 -03:00

sources.rs

impl Default for RepeatN

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