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Describe next_back() wrt Iterator protocol #31201

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Merged
bors merged 1 commit into from
Jan 26, 2016
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Describe next_back() wrt Iterator protocol #31201

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6 changes: 6 additions & 0 deletions src/libcore/iter.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2740,7 +2740,13 @@ pub trait Extend<A> {
/// It is important to note that both back and forth work on the same range,
/// and do not cross: iteration is over when they meet in the middle.
///
/// In a similar fashion to the [`Iterator`] protocol, once a
/// `DoubleEndedIterator` returns `None` from a `next_back()`, calling it again
/// may or may not ever return `Some` again. `next()` and `next_back()` are
/// interchangable for this purpose.
///
/// [`Iterator`]: trait.Iterator.html
///
/// # Examples
///
/// Basic usage:
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