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The only function being used by itertools is Itertools::join() which is not mentioned in any breaking changes to itertools between v0.10 and v0.13:
https://github.com/rust-itertools/itertools/blob/master/CHANGELOG.md#0130
https://github.com/rust-itertools/itertools/blob/master/CHANGELOG.md#0120
https://github.com/rust-itertools/itertools/blob/master/CHANGELOG.md#0110