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Add const_cell_into_inner to OnceCell

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`Cell` and `RefCell` have their `into_inner` methods const unstable.
`OnceCell` has the same logic, so add it under the same gate.

Tracking issue: https://github.com/rust-lang/rust/issues/78729
This commit is contained in:
Trevor Gross 2024-08-21 17:22:08 -05:00
parent 6b678c57b6
commit 81c00dde2b
1 changed files with 2 additions and 1 deletions
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library/core/src/cell/once.rs
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@ -309,7 +309,8 @@ impl<T> OnceCell<T> {
/// ``` /// ```
#[inline] #[inline]
#[stable(feature = "once_cell", since = "1.70.0")] #[stable(feature = "once_cell", since = "1.70.0")]
pub fn into_inner(self) -> Option<T> { #[rustc_const_unstable(feature = "const_cell_into_inner", issue = "78729")]
pub const fn into_inner(self) -> Option<T> {
// Because `into_inner` takes `self` by value, the compiler statically verifies // Because `into_inner` takes `self` by value, the compiler statically verifies
// that it is not currently borrowed. So it is safe to move out `Option<T>`. // that it is not currently borrowed. So it is safe to move out `Option<T>`.
self.inner.into_inner() self.inner.into_inner()