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Stabilize `rwlock_downgrade` library feature Tracking Issue: https://github.com/rust-lang/rust/issues/128203 Method to be stabilized: ```rust impl<'a, T: ?Sized> RwLockWriteGuard<'a, T> { pub fn downgrade(s: Self) -> RwLockReadGuard<'a, T> {} } ``` ~~I would like to point out that my documentation comment is longer than ideal, but at the same time I don't really know how else to show why `downgrade` is actually necessary (instead of just unlocking and relocking). If anyone has ideas for making this more concise that would be great!~~ I have made the documentation a bit more clear. Stabilization report: https://github.com/rust-lang/rust/issues/128203#issuecomment-3016682463