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Rollup merge of #57608 - timvisee:master, r=frewsxcv
Simplify 'product' factorial example This simplifies the [`factorial(n: 32)`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#examples-46) implementation as example for the `Iterator::product()` function. It currently uses unnecessary additional complexity. Although very minimal, I do not want to include it in some other irrelevant PR.
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