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Weaken guarantee around advancing underlying iterators in zip #83791

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Nov 27, 2021
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Weaken guarantee around advancing underlying iterators in zip #83791

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6 changes: 4 additions & 2 deletions library/core/src/iter/traits/iterator.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -457,8 +457,10 @@ pub trait Iterator {
/// In other words, it zips two iterators together, into a single one.
///
/// If either iterator returns [`None`], [`next`] from the zipped iterator
/// will return [`None`]. If the first iterator returns [`None`], `zip` will
/// short-circuit and `next` will not be called on the second iterator.
/// will return [`None`].
/// If the zipped iterator has no more elements to return then each further attempt to advance
/// it will first try to advance the first iterator at most one time and if it still yielded an item
/// try to advance the second iterator at most one time.
///
/// # Examples
///
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