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Clarify Extend behaviour wrt existing keys #38636

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Jan 14, 2017
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Clarify Extend behaviour wrt existing keys #38636

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Clarify Extend behaviour wrt existing keys
shahn Dec 27, 2016
74b2587
For Extend, document collections allowing duplicate keys
shahn Jan 5, 2017
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5 changes: 4 additions & 1 deletion src/libcore/iter/traits.rs
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Expand Up @@ -260,7 +260,10 @@ impl<I: Iterator> IntoIterator for I {
///
/// Iterators produce a series of values, and collections can also be thought
/// of as a series of values. The `Extend` trait bridges this gap, allowing you
/// to extend a collection by including the contents of that iterator.
/// to extend a collection by including the contents of that iterator. When
/// extending a collection with an already existing key, that entry is updated
/// or, in the case of collections that permit multiple entries with equal
/// keys, that entry is inserted.
///
/// # Examples
///
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