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Use the [scopeguard](https://docs.rs/scopeguard/) defer macro to run cleanup code for `new_slab_future`. This means it can be a single async function, avoiding the need to create a struct and implement `PinnedDrop` Async cleanup in Rust is awkward because async functions may be cancelled at any await point when their Future is dropped. The scopeguard approach comes from the following articles: * [How to think about `async`/`await` in Rust](http://cliffle.com/blog/async-inversion/) * [Async Cancellation I](https://blog.yoshuawuyts.com/async-cancellation-1/) (Reddit [discussion](https://www.reddit.com/r/rust/comments/qrhg39/blog_post_async_cancellation/)) |
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