Use cast_array in core

Author: scottmcm

library/core/src/slice/mod.rs

@@ -330,7 +330,7 @@ impl<T> [T] {
         } else {
             // SAFETY: We explicitly check for the correct number of elements,
             //   and do not let the reference outlive the slice.
-            Some(unsafe { &*(self.as_ptr().cast::<[T; N]>()) })
+            Some(unsafe { &*(self.as_ptr().cast_array()) })
         }
     }
 
@@ -361,7 +361,7 @@ impl<T> [T] {
             // SAFETY: We explicitly check for the correct number of elements,
             //   do not let the reference outlive the slice,
             //   and require exclusive access to the entire slice to mutate the chunk.
-            Some(unsafe { &mut *(self.as_mut_ptr().cast::<[T; N]>()) })
+            Some(unsafe { &mut *(self.as_mut_ptr().cast_array()) })
         }
     }
 
@@ -389,7 +389,7 @@ impl<T> [T] {
 
         // SAFETY: We explicitly check for the correct number of elements,
         //   and do not let the references outlive the slice.
-        Some((unsafe { &*(first.as_ptr().cast::<[T; N]>()) }, tail))
+        Some((unsafe { &*(first.as_ptr().cast_array()) }, tail))
     }
 
     /// Returns a mutable array reference to the first `N` items in the slice and the remaining
@@ -422,7 +422,7 @@ impl<T> [T] {
         // SAFETY: We explicitly check for the correct number of elements,
         //   do not let the reference outlive the slice,
         //   and enforce exclusive mutability of the chunk by the split.
-        Some((unsafe { &mut *(first.as_mut_ptr().cast::<[T; N]>()) }, tail))
+        Some((unsafe { &mut *(first.as_mut_ptr().cast_array()) }, tail))
     }
 
     /// Returns an array reference to the last `N` items in the slice and the remaining slice.
@@ -450,7 +450,7 @@ impl<T> [T] {
 
         // SAFETY: We explicitly check for the correct number of elements,
         //   and do not let the references outlive the slice.
-        Some((init, unsafe { &*(last.as_ptr().cast::<[T; N]>()) }))
+        Some((init, unsafe { &*(last.as_ptr().cast_array()) }))
     }
 
     /// Returns a mutable array reference to the last `N` items in the slice and the remaining
@@ -484,7 +484,7 @@ impl<T> [T] {
         // SAFETY: We explicitly check for the correct number of elements,
         //   do not let the reference outlive the slice,
         //   and enforce exclusive mutability of the chunk by the split.
-        Some((init, unsafe { &mut *(last.as_mut_ptr().cast::<[T; N]>()) }))
+        Some((init, unsafe { &mut *(last.as_mut_ptr().cast_array()) }))
     }
 
     /// Returns an array reference to the last `N` items in the slice.
@@ -513,7 +513,7 @@ impl<T> [T] {
 
         // SAFETY: We explicitly check for the correct number of elements,
         //   and do not let the references outlive the slice.
-        Some(unsafe { &*(last.as_ptr().cast::<[T; N]>()) })
+        Some(unsafe { &*(last.as_ptr().cast_array()) })
     }
 
     /// Returns a mutable array reference to the last `N` items in the slice.
@@ -544,7 +544,7 @@ impl<T> [T] {
         // SAFETY: We explicitly check for the correct number of elements,
         //   do not let the reference outlive the slice,
         //   and require exclusive access to the entire slice to mutate the chunk.
-        Some(unsafe { &mut *(last.as_mut_ptr().cast::<[T; N]>()) })
+        Some(unsafe { &mut *(last.as_mut_ptr().cast_array()) })
     }
 
     /// Returns a reference to an element or subslice depending on the type of