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3 changes: 3 additions & 0 deletions src/libcore/iter.rs
Original file line number Diff line number Diff line change
Expand Up @@ -2338,6 +2338,9 @@ impl<I: DoubleEndedIterator, U, F> DoubleEndedIterator for FlatMap<I, U, F> wher

/// An iterator that yields `None` forever after the underlying iterator
/// yields `None` once.
///
/// These can be created through
/// [`iter.fuse()`](trait.Iterator.html#method.fuse).
#[derive(Clone)]
#[must_use = "iterator adaptors are lazy and do nothing unless consumed"]
#[stable(feature = "rust1", since = "1.0.0")]
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