Matthias Krüger 4af985ac00
Rollup merge of #91215 - GuillaumeGomez:vec-deque-retain-mut, r=m-ou-se
Implement VecDeque::retain_mut

Part of https://github.com/rust-lang/rust/issues/90829.

In https://github.com/rust-lang/rust/pull/90772, someone suggested that `retain_mut` should also be implemented on `VecDeque`. I think that it follows the same logic (coherency). So first: is it ok? Second: should I create a new feature for it or can we put it into the same one?

r? `@joshtriplett`
2021-12-05 00:37:59 +01:00
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