[T]::as_[mut_]slice

Author: GrigorenkoPV

library/core/src/slice/mod.rs

@@ -4893,6 +4893,28 @@ impl<T> [T] {
 
         if start <= self.len() && end <= self.len() { Some(start..end) } else { None }
     }
+
+    /// Returns the same slice `&[T]`.
+    ///
+    /// This method is redundant when used directly on `&[T]`, but
+    /// it helps dereferencing other "container" types to slices,
+    /// for example `Box<[T]>` or `Arc<[T]>`.
+    #[inline]
+    #[unstable(feature = "thing_as_thing", issue = "none")]
+    pub const fn as_slice(&self) -> &[T] {
+        self
+    }
+
+    /// Returns the same slice `&mut [T]`.
+    ///
+    /// This method is redundant when used directly on `&mut [T]`, but
+    /// it helps dereferencing other "container" types to slices,
+    /// for example `Box<[T]>` or `Arc<[T]>`.
+    #[inline]
+    #[unstable(feature = "thing_as_thing", issue = "none")]
+    pub const fn as_mut_slice(&mut self) -> &mut [T] {
+        self
+    }
 }
 
 impl<T> [MaybeUninit<T>] {