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Add Iterator::flatten by Centril · Pull Request #48115 · rust-lang/rust
https://github.com/rust-lang/rust/pull/48115
github.comAdd Iterator::flatten by Centril · Pull Request #48115 · rust-lang/rustTracking issue: #48213
This adds the trait method .flatten() on Iterator which flattens one level of nesting from an iterator or (into)iterators. The method .flat_fmap(f) is then redefined as .map(...