Rollup merge of #28210 - tshepang:typo, r=steveklabnik
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@ -243,7 +243,7 @@ Many of the types above cannot be used in a threadsafe manner. Particularly, `Rc
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`RefCell<T>`, which both use non-atomic reference counts (_atomic_ reference counts are those which
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can be incremented from multiple threads without causing a data race), cannot be used this way. This
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makes them cheaper to use, but we need thread safe versions of these too. They exist, in the form of
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`Arc<T>` and `Mutex<T>`/`RWLock<T>`
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`Arc<T>` and `Mutex<T>`/`RwLock<T>`
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Note that the non-threadsafe types _cannot_ be sent between threads, and this is checked at compile
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time.
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