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unsafe impls for `Send` and `Sync` should not be added by default. in the case of `SlotGuard` removing them does not cause any issues, as the compiler automatically derives those. This PR adds requirement to document the unsafety (see [clippy::undocumented_unsafe_blocks]) and opportunistically adds `#![deny(unsafe_code)]` to most places where we don't have unsafe code right now. TRPL on Send and Sync: https://doc.rust-lang.org/book/ch16-04-extensible-concurrency-sync-and-send.html [clippy::undocumented_unsafe_blocks]: https://rust-lang.github.io/rust-clippy/master/#/undocumented_unsafe_blocks