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Update send-sync.md (#258)

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Adding notes that these traits are not to be implemented directly. Yet they are still to be used as normal traits in generic constraints.
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Igor Petruk 2023-01-23 07:51:41 +00:00 committed by GitHub
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@ -7,5 +7,16 @@ How does Rust know to forbid shared access across thread? The answer is in two t
* [`Sync`][2]: a type `T` is `Sync` if it is safe to move a `&T` across a thread
boundary.
Both traits are not to be implemented. They are implemented automatically when
the compiler determines it’s appropriate.
[1]: https://doc.rust-lang.org/std/marker/trait.Send.html
[2]: https://doc.rust-lang.org/std/marker/trait.Sync.html
<details>
* One can think of these traits as markers that the type has certain
thread-safety properties.
* They can be used in the generic constraints as normal traits.
</details>