5849a7eca9
Implement advance_by, advance_back_by for iter::Chain Part of #77404. This PR does two things: - implement `Chain::advance[_back]_by` in terms of `advance[_back]_by` on `self.a` and `advance[_back]_by` on `self.b` - change `Chain::nth[_back]` to use `advance[_back]_by` on `self.a` and `nth[_back]` on `self.b` This ensures that `Chain::nth` can take advantage of an efficient `nth` implementation on the second iterator, in case it doesn't implement `advance_by`. cc `@scottmcm` in case you want to review this |
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