tweaks to core::iterator #6589
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tweaks to core::iterator #6589
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it's the same as `next.unwrap()`, but there's no way to check the length of an iterator so this isn't a good pattern
There isn't a way to take the length of any iterator, so failing on a zero length would make these much less useful.
bors
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…labels_to_doc, r=flip1995 Add notes of prioritization labels to doc Refer to https://rust-lang.zulipchat.com/#narrow/stream/257328-clippy/topic/New.20prioritization.20labels. changelog: none
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