Tracking Issue for `const_split_off_first_last`

Feature gate: #![feature(const_split_off_first_last)]

This is a tracking issue for using <[T]>::split_off_* functions in const. These functions remove either the first or last element from a slice and return a reference or mutable reference to that element.

The original functions were stabilized with the slice_take feature.
slice_take tracking issue: #62280

Public API

impl<T> [T] {
    pub const fn split_off_first<'a>(self: &mut &'a Self) -> Option<&'a T>;
    pub const fn split_off_first_mut<'a>(self: &mut &'a mut Self) -> Option<&'a mut T>;
    pub const fn split_off_last<'a>(self: &mut &'a Self) -> Option<&'a T>;
    pub const fn split_off_last_mut<'a>(self: &mut &'a mut Self) -> Option<&'a mut T>;
}

Steps / History

• Implementation: #138540
• Final comment period (FCP)^1
• Stabilization PR

Unresolved Questions

• None yet.

Start by reading the public API and Steps / History, then inspect implementation PR #138540; no source file or test is named in the issue. The tracking work is complete when the remaining FCP and stabilization steps are resolved and the API is stabilized.