Rollup merge of #55178 - sdroege:stabilize-chunks-exact, r=alexcrichton

Stabilize slice::chunks_exact(), chunks_exact_mut(), rchunks(), rchunks_mut(), rchunks_exact(), rchunks_exact_mut()

Fixes #47115, #55177

Author: kennytm

src/liballoc/lib.rs

@@ -115,12 +115,10 @@
 #![feature(unsize)]
 #![feature(allocator_internals)]
 #![feature(on_unimplemented)]
-#![feature(chunks_exact)]
 #![feature(rustc_const_unstable)]
 #![feature(const_vec_new)]
 #![feature(slice_partition_dedup)]
 #![feature(maybe_uninit)]
-#![feature(rchunks)]
 
 // Allow testing this library
 

src/liballoc/slice.rs

@@ -123,9 +123,9 @@ pub use core::slice::{from_raw_parts, from_raw_parts_mut};
 pub use core::slice::{from_ref, from_mut};
 #[stable(feature = "slice_get_slice", since = "1.28.0")]
 pub use core::slice::SliceIndex;
-#[unstable(feature = "chunks_exact", issue = "47115")]
+#[stable(feature = "chunks_exact", since = "1.31.0")]
 pub use core::slice::{ChunksExact, ChunksExactMut};
-#[unstable(feature = "rchunks", issue = "55177")]
+#[stable(feature = "rchunks", since = "1.31.0")]
 pub use core::slice::{RChunks, RChunksMut, RChunksExact, RChunksExactMut};
 
 ////////////////////////////////////////////////////////////////////////////////

src/liballoc/tests/lib.rs

@@ -19,8 +19,6 @@
 #![feature(str_escape)]
 #![feature(try_reserve)]
 #![feature(unboxed_closures)]
-#![feature(chunks_exact)]
-#![feature(rchunks)]
 #![feature(repeat_generic_slice)]
 
 extern crate alloc_system;