Auto merge of #97419 - WaffleLapkin:const_from_ptr_range, r=oli-obk

Make `from{,_mut}_ptr_range` const

This PR makes the following APIs `const`:
```rust
// core::slice

pub const unsafe fn from_ptr_range<'a, T>(range: Range<*const T>) -> &'a [T];
pub const unsafe fn from_mut_ptr_range<'a, T>(range: Range<*mut T>) -> &'a mut [T];
```

Tracking issue: #89792.
Feature for `from_ptr_range` as a `const fn`: `slice_from_ptr_range_const`.
Feature for `from_mut_ptr_range` as a `const fn`: `slice_from_mut_ptr_range_const`.

r? `@oli-obk`

2 files changed, 3 insertions, 0 deletions

diff --git a/library/alloc/src/lib.rs b/library/alloc/src/lib.rs
index fd21b367118..35b8b386dce 100644
--- a/library/alloc/src/lib.rs
+++ b/library/alloc/src/lib.rs
@@ -130,6 +130,7 @@
 #![feature(ptr_sub_ptr)]
 #![feature(receiver_trait)]
 #![feature(set_ptr_value)]
+#![feature(slice_from_ptr_range)]
 #![feature(slice_group_by)]
 #![feature(slice_ptr_get)]
 #![feature(slice_ptr_len)]
diff --git a/library/alloc/src/slice.rs b/library/alloc/src/slice.rs
index 199b3c9d029..4a9cecd9b4e 100644
--- a/library/alloc/src/slice.rs
+++ b/library/alloc/src/slice.rs
@@ -114,6 +114,8 @@ pub use core::slice::EscapeAscii;
 pub use core::slice::SliceIndex;
 #[stable(feature = "from_ref", since = "1.28.0")]
 pub use core::slice::{from_mut, from_ref};
+#[unstable(feature = "slice_from_ptr_range", issue = "89792")]
+pub use core::slice::{from_mut_ptr_range, from_ptr_range};
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use core::slice::{from_raw_parts, from_raw_parts_mut};
 #[stable(feature = "rust1", since = "1.0.0")]