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Rollup merge of #150777 - stabilize_elem_offset, r=jhpratt

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Stabilize `slice::element_offset`

[slice::element_offset](https://doc.rust-lang.org/std/primitive.slice.html#method.element_offset)

Partially stabilizes rust-lang/rust#126769 (substr_range).

[FCP completed](https://github.com/rust-lang/rust/issues/126769#issuecomment-3458159941)

The other methods are [stalled because of the new range types](https://github.com/rust-lang/rust/issues/126769#issuecomment-3599721663), but this method doesn't use ranges.
This commit is contained in:
Matthias Krüger 2026-01-08 07:27:56 +01:00 • committed by GitHub
commit e8217318c6
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6
library/core/src/slice/mod.rs
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@ -4809,8 +4809,6 @@ impl<T> [T] {
/// # Examples
/// Basic usage:
/// ```
/// #![feature(substr_range)]
///
/// let nums: &[u32] = &[1, 7, 1, 1];
/// let num = &nums[2];
///
@ -4819,8 +4817,6 @@ impl<T> [T] {
/// ```
/// Returning `None` with an unaligned element:
/// ```
/// #![feature(substr_range)]
///
/// let arr: &[[u32; 2]] = &[[0, 1], [2, 3]];
/// let flat_arr: &[u32] = arr.as_flattened();
///
@ -4834,7 +4830,7 @@ impl<T> [T] {
/// assert_eq!(arr.element_offset(weird_elm), None); // Points between element 0 and 1
/// ```
#[must_use]
#[unstable(feature = "substr_range", issue = "126769")]
#[stable(feature = "element_offset", since = "CURRENT_RUSTC_VERSION")]
pub fn element_offset(&self, element: &T) -> Option<usize> {
if T::IS_ZST {
panic!("elements are zero-sized");