Matthias Krüger 2c380a4661
Rollup merge of #134995 - DaniPopes:stable-const_slice_flatten, r=Amanieu
Stabilize const_slice_flatten

Const-stabilizes `slice::as_flattened{,_mut}`:
```rust
// core::slice
impl<T, const N: usize> [[T; N]] {
    pub const fn as_flattened(&self) -> &[T];
    pub const fn as_flattened_mut(&mut self) -> &mut [T];
}
```

Tracking issue: https://github.com/rust-lang/rust/issues/95629

Requires separate FCP, as per https://github.com/rust-lang/rust/issues/95629#issuecomment-2566546257.

Closes https://github.com/rust-lang/rust/issues/95629.

`````@rustbot````` modify labels: +T-libs-api

Happy new year!
2025-02-19 18:52:03 +01:00
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