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Rollup merge of #144091 - thaliaarchi:stabilize-new-zeroed, r=Mark-Simulacrum

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Stabilize `new_zeroed_alloc`

The corresponding `new_uninit` and `new_uninit_slice` functions were stabilized in rust-lang/rust#129401, but the zeroed counterparts were left for later out of a [desire](https://github.com/rust-lang/rust/issues/63291#issuecomment-2161039756) to stabilize only the minimal set. These functions are straightforward mirrors of the uninit functions and well-established. Since no blockers or design questions have surfaced in the past year, I think it's time to stabilize them.

Tracking issue: rust-lang/rust#129396
This commit is contained in:
Stuart Cook
2025-09-21 14:42:33 +10:00
committed by GitHub
parent d2533189de 175afd7618
commit 7a5819d154
6 changed files with 9 additions and 44 deletions
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4
compiler/rustc_index/src/bit_set.rs
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@@ -645,7 +645,7 @@ impl<T: Idx> ChunkedBitSet<T> {
};
#[cfg(not(feature = "nightly"))]
let mut words = {
// FIXME: unconditionally use `Rc::new_zeroed` once it is stable (#63291).
// FIXME: unconditionally use `Rc::new_zeroed` once it is stable (#129396).
let words = mem::MaybeUninit::<[Word; CHUNK_WORDS]>::zeroed();
// SAFETY: `words` can safely be all zeroes.
let words = unsafe { words.assume_init() };
@@ -708,7 +708,7 @@ impl<T: Idx> ChunkedBitSet<T> {
};
#[cfg(not(feature = "nightly"))]
let mut words = {
// FIXME: unconditionally use `Rc::new_zeroed` once it is stable (#63291).
// FIXME: unconditionally use `Rc::new_zeroed` once it is stable (#129396).
let words = mem::MaybeUninit::<[Word; CHUNK_WORDS]>::zeroed();
// SAFETY: `words` can safely be all zeroes.
let words = unsafe { words.assume_init() };