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Iterator::cloned: document side effect behavior #92543

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Iterator::cloned: document side effect behavior #92543

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5 changes: 5 additions & 0 deletions library/core/src/iter/traits/iterator.rs
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Expand Up @@ -2998,6 +2998,11 @@ pub trait Iterator {
/// This is useful when you have an iterator over `&T`, but you need an
/// iterator over `T`.
///
/// Note that unlike copying, cloning is regarded as a side effect, because
/// `Clone` implementations may contain observable behavior. For example,
/// `iter.cloned().last()` will clone all elements even if only the last
/// one is actually returned.
///
/// [`clone`]: Clone::clone
///
/// # Examples
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