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Add #[must_use] to Rc::downgrade

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This commit is contained in:
John Kugelman 2021-10-12 18:27:03 -04:00
parent 044674337a
commit 5bb99bb02d
1 changed files with 3 additions and 1 deletions
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4
library/alloc/src/rc.rs
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@ -41,7 +41,7 @@
//! use std::rc::Rc; //! use std::rc::Rc;
//! //!
//! let my_rc = Rc::new(()); //! let my_rc = Rc::new(());
//! Rc::downgrade(&my_rc); //! let my_weak = Rc::downgrade(&my_rc);
//! ``` //! ```
//! //!
//! `Rc<T>`'s implementations of traits like `Clone` may also be called using //! `Rc<T>`'s implementations of traits like `Clone` may also be called using
@ -889,6 +889,8 @@ impl<T: ?Sized> Rc<T> {
/// ///
/// let weak_five = Rc::downgrade(&five); /// let weak_five = Rc::downgrade(&five);
/// ``` /// ```
#[must_use = "this returns a new `Weak` pointer, \
without modifying the original `Rc`"]
#[stable(feature = "rc_weak", since = "1.4.0")] #[stable(feature = "rc_weak", since = "1.4.0")]
pub fn downgrade(this: &Self) -> Weak<T> { pub fn downgrade(this: &Self) -> Weak<T> {
this.inner().inc_weak(); this.inner().inc_weak();