rust/src/libextra
bors 73e9a121d2 auto merge of #7921 : bytewiseand/rust/smallint-iter, r=huonw
Made the `iter` and `mut_iter` methods on SmallIntMap and SmallIntSet return double-ended-iterators. These iterators now implement `size_hint`.

Also the iterator tests only tested dense maps/sets, which aren't very useful. So they were changed to iterate over sparse maps/sets.

Fixes #7721
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