Issue #13933: Remove transmute_mut from Arc
directly use the internal pointer instead.
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@ -160,7 +160,8 @@ impl<T: Send + Share + Clone> Arc<T> {
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// reference count is guaranteed to be 1 at this point, and we required
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// the Arc itself to be `mut`, so we're returning the only possible
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// reference to the inner data.
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unsafe { mem::transmute::<&_, &mut _>(self.deref()) }
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let inner = unsafe { &mut *self._ptr };
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&mut inner.data
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}
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}
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