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Rollup merge of #129382 - tgross35:once-cell-const-into-inner, r=Noratrieb 

Add `const_cell_into_inner` to `OnceCell`

`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:
Matthias Krüger 2024-08-22 08:17:22 +02:00 committed by GitHub
parent ae58bbfbce 81c00dde2b
commit 28d4b8248e
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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]
#[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
// that it is not currently borrowed. So it is safe to move out `Option<T>`.
self.inner.into_inner()