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Add trait bound to example for MutexGuard that is !Send + Sync (#1358)

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This example only makes sense (and is therefore easier to understand
logically :) ) if T is Sync. See
https://github.com/rust-lang/rust/issues/41622 - this used to be a bug
initially.
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Fabian Bornhofen 2023-10-12 22:29:37 +02:00 committed by GitHub
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src/concurrency/send-sync/examples.md
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@ -28,7 +28,7 @@ Typically because of interior mutability:
These types are thread-safe, but they cannot be moved to another thread: These types are thread-safe, but they cannot be moved to another thread:
* `MutexGuard<T>`: Uses OS level primitives which must be deallocated on the * `MutexGuard<T: Sync>`: Uses OS level primitives which must be deallocated on the
thread which created them. thread which created them.
## `!Send + !Sync` ## `!Send + !Sync`