Auto merge of #30130 - tbu-:pr_array_clone, r=alexcrichton

[breaking-change]

Author: bors

src/libcore/array.rs

@@ -27,7 +27,7 @@ use default::Default;
 use fmt;
 use hash::{Hash, self};
 use iter::IntoIterator;
-use marker::{Copy, Sized, Unsize};
+use marker::{Sized, Unsize};
 use option::Option;
 use slice::{Iter, IterMut, SliceExt};
 
@@ -94,13 +94,6 @@ macro_rules! array_impls {
                 }
             }
 
-            #[stable(feature = "rust1", since = "1.0.0")]
-            impl<T:Copy> Clone for [T; $N] {
-                fn clone(&self) -> [T; $N] {
-                    *self
-                }
-            }
-
             #[stable(feature = "rust1", since = "1.0.0")]
             impl<T: Hash> Hash for [T; $N] {
                 fn hash<H: hash::Hasher>(&self, state: &mut H) {
@@ -210,3 +203,30 @@ macro_rules! array_impl_default {
 }
 
 array_impl_default!{32, T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T}
+
+macro_rules! array_impl_clone {
+    {$n:expr, $i:expr, $($idx:expr,)*} => {
+        #[stable(feature = "rust1", since = "1.0.0")]
+        impl<T: Clone> Clone for [T; $n] {
+            fn clone(&self) -> [T; $n] {
+                [self[$i-$i].clone(), $(self[$i-$idx].clone()),*]
+            }
+        }
+        array_impl_clone!{$i, $($idx,)*}
+    };
+    {$n:expr,} => {
+        #[stable(feature = "rust1", since = "1.0.0")]
+        impl<T: Clone> Clone for [T; 0] {
+            fn clone(&self) -> [T; 0] {
+                []
+            }
+        }
+    };
+}
+
+array_impl_clone! {
+                                32, 31, 30,
+    29, 28, 27, 26, 25, 24, 23, 22, 21, 20,
+    19, 18, 17, 16, 15, 14, 13, 12, 11, 10,
+     9,  8,  7,  6,  5,  4,  3,  2,  1,  0,
+}