small fix in RELEASES
this grammar isn't correct
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@ -79,7 +79,7 @@ Libraries
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are used by code generators to emit implementations of [`Debug`].
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* `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
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methods that convert case, following Unicode case mapping.
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* It is now easier to handle to poisoned locks. The [`PoisonError`]
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* It is now easier to handle poisoned locks. The [`PoisonError`]
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type, returned by failing lock operations, exposes `into_inner`,
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`get_ref`, and `get_mut`, which all give access to the inner lock
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guard, and allow the poisoned lock to continue to operate. The
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