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Rollup merge of #80442 - steffahn:mention_arc_in_cow, r=Mark-Simulacrum

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Mention Arc::make_mut and Rc::make_mut in the documentation of Cow

Following this discussion: https://users.rust-lang.org/t/should-the-cow-documentation-mention-arc/53341

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`@rustbot` modify labels: T-doc, T-libs
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Yuki Okushi 2021-01-05 09:52:33 +09:00 • committed by GitHub
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library/alloc/src/borrow.rs
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@ -103,6 +103,11 @@ where
/// is desired, `to_mut` will obtain a mutable reference to an owned /// is desired, `to_mut` will obtain a mutable reference to an owned
/// value, cloning if necessary. /// value, cloning if necessary.
/// ///
/// If you need reference-counting pointers, note that
/// [`Rc::make_mut`][crate::rc::Rc::make_mut] and
/// [`Arc::make_mut`][crate::sync::Arc::make_mut] can provide clone-on-write
/// functionality as well.
///
/// # Examples /// # Examples
/// ///
/// ``` /// ```