Fix Skip::next for non-fused inner iterators
#99434
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…=scottmcm Fix `Skip::next` for non-fused inner iterators `iter.skip(n).next()` will currently call `nth` and `next` in succession on `iter`, without checking whether `nth` exhausts the iterator. Using `?` to propagate a `None` value returned by `nth` avoids this.
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Rollup of 8 pull requests Successful merges: - rust-lang#97183 (wf-check generators) - rust-lang#98320 (Mention first and last macro in backtrace) - rust-lang#99335 (Use split_once in FromStr docs) - rust-lang#99347 (Use `LocalDefId` in `OpaqueTypeKey`) - rust-lang#99392 (Fix debuginfo tests.) - rust-lang#99404 (Use span_bug for unexpected field projection type) - rust-lang#99410 (Update invalid atomic ordering lint) - rust-lang#99434 (Fix `Skip::next` for non-fused inner iterators) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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iter.skip(n).next()will currently callnthandnextin succession oniter, without checking whethernthexhausts the iterator. Using?to propagate aNonevalue returned bynthavoids this.