Add '<[T]>::as_array', '<[T]>::as_mut_array', '<*const [T]>::as_array', and '<*mut [T]>::as_mut_array' conversion methods;

library/core/src/lib.rs

@@ -144,6 +144,7 @@
 #![feature(ptr_alignment_type)]
 #![feature(ptr_metadata)]
 #![feature(set_ptr_value)]
+#![feature(slice_as_array)]
 #![feature(slice_as_chunks)]
 #![feature(slice_ptr_get)]
 #![feature(str_internals)]