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Add const default for OnceCell and OnceLock #149812

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Add const default for OnceCell and OnceLock #149812

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3 changes: 2 additions & 1 deletion library/core/src/cell/once.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -353,7 +353,8 @@ impl<T> OnceCell<T> {
}

#[stable(feature = "once_cell", since = "1.70.0")]
impl<T> Default for OnceCell<T> {
#[rustc_const_unstable(feature = "const_default", issue = "143894")]
impl<T> const Default for OnceCell<T> {
#[inline]
fn default() -> Self {
Self::new()
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1 change: 1 addition & 0 deletions library/std/src/lib.rs
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Expand Up @@ -274,6 +274,7 @@
#![feature(cfg_sanitizer_cfi)]
#![feature(cfg_target_thread_local)]
#![feature(cfi_encoding)]
#![feature(const_default)]
#![feature(const_trait_impl)]
#![feature(core_float_math)]
#![feature(decl_macro)]
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3 changes: 2 additions & 1 deletion library/std/src/sync/once_lock.rs
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Expand Up @@ -582,7 +582,8 @@ impl<T: RefUnwindSafe + UnwindSafe> RefUnwindSafe for OnceLock<T> {}
impl<T: UnwindSafe> UnwindSafe for OnceLock<T> {}

#[stable(feature = "once_cell", since = "1.70.0")]
impl<T> Default for OnceLock<T> {
#[rustc_const_unstable(feature = "const_default", issue = "143894")]
impl<T> const Default for OnceLock<T> {
/// Creates a new uninitialized cell.
///
/// # Example
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