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Rollup merge of rust-lang#58730 - timvermeulen:internal_iteration, r=…
…scottmcm Have all methods of Filter and FilterMap use internal iteration This PR changes `Filter::{next, next_back, count}` and `FilterMap::{next, next_back}` to all use internal iteration. The `next` and `next_back` methods are changed to directly forward to `try_for_each` and `try_rfold` respectively, using `Result` as the `Try` type. I think that's okay? Alternatively, I could change their implementations to use `LoopState` instead if there's any benefit in doing so. r? @scottmcm
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