Send and Sync Traits
Send means a type can be moved to another thread; Sync means &T can be shared across threads (T is Sync iff &T is Send). Both are auto traits derived structurally, which is why Rc is neither while Arc<Mutex<T>> is both, and why data races become compile errors.
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Send means a type can be moved to another thread; Sync means &T can be shared across threads (T is Sync iff &T is Send). Both are auto traits derived structurally, which is why Rc is neither while Arc<Mutex<T>> is both, and why data races become compile errors.
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