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Auto merge of #135 - bluss:untagged-unions-with-manually-drop, r=mbru…
…beck Update union code to use ManuallyDrop At the time of this writing, this breaking change is *proposed*, see rust-lang/rust/pull/56440. Smallvec would have to be updated before the change can be merged upstream. Thanks! A Rust breaking change to the untagged_unions feature means that no union fields may have destructors, so we need use ManuallyDrop also around the inline union field. <!-- Reviewable:start --> --- This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/rust-smallvec/135) <!-- Reviewable:end -->
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