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Rollup merge of rust-lang#102342 - jmillikin:nonzero-negation, r=scot…
…tmcm Add negation methods for signed non-zero integers. Performing negation with defined wrapping semantics (such as `wrapping_neg()`) on a non-zero integer currently requires unpacking to a primitive and re-wrapping. Since negation of non-zero signed integers always produces a non-zero result, it is safe to implement the various `*_neg()` methods for `NonZeroI{N}`. I'm not sure what to do about the `#[unstable(..., issue = "none")]` here -- should I file a tracking issue, or is that handled by the Rust dev team? ACP: rust-lang/libs-team#105
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