Allow using `Range` as an `Iterator` in const contexts. #104100

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bors merged 2 commits intorust-lang:masterfrom ink-feather-org:const_iter_range

Mar 19, 2023

+87-31

Commits on Mar 17, 2023

Make the Step implementations const.
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Commits on Mar 18, 2023

Mark DoubleEndedIterator as #[const_trait] using rustc_do_not_const_check, implement const Iterator and DoubleEndedIterator for Range.
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