Unnamed repository; edit this file 'description' to name the repository.
Auto merge of #108273 - tspiteri:const_slice_split_at_not_mut, r=dtolnay
Stabilize const slice::split_at
This stabilizes the use of the following method in const context:
```rust
impl<T> [T] {
pub const fn split_at(&self, mid: usize) -> (&[T], &[T]);
}
```
cc tracking issue #101158
