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Link to FFI in Concurrency chapter #28969

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4 changes: 3 additions & 1 deletion src/doc/trpl/concurrency.md
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Expand Up @@ -35,10 +35,12 @@ channel connecting two threads, we would want to be able to send some data
down the channel and to the other thread. Therefore, we'd ensure that `Send` was
implemented for that type.

In the opposite way, if we were wrapping a library with FFI that isn't
In the opposite way, if we were wrapping a library with [FFI][ffi] that isn't
threadsafe, we wouldn't want to implement `Send`, and so the compiler will help
us enforce that it can't leave the current thread.

[ffi]: ffi.html

### `Sync`

The second of these traits is called [`Sync`](../std/marker/trait.Sync.html).
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