auto merge of #5751 : metajack/rust/at-clones, r=thestinger

The borrowck-borrow-from-expr-block test had to be updated. I'm not sure why
it compiled before since ~int was already clonable.

Author: bors

src/libcore/clone.rs

@@ -1,4 +1,4 @@
-// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
+// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
 // file at the top-level directory of this distribution and at
 // http://rust-lang.org/COPYRIGHT.
 //
@@ -36,6 +36,16 @@ impl<T:Clone> Clone for ~T {
     fn clone(&self) -> ~T { ~(**self).clone() }
 }
 
+impl<T:Clone> Clone for @T {
+    #[inline(always)]
+    fn clone(&self) -> @T { @(**self).clone() }
+}
+
+impl<T:Clone> Clone for @mut T {
+    #[inline(always)]
+    fn clone(&self) -> @mut T { @mut (**self).clone() }
+}
+
 macro_rules! clone_impl(
     ($t:ty) => {
         impl Clone for $t {
@@ -63,3 +73,24 @@ clone_impl!(f64)
 
 clone_impl!(bool)
 clone_impl!(char)
+
+#[test]
+fn test_owned_clone() {
+    let a : ~int = ~5i;
+    let b : ~int = a.clone();
+    assert!(a == b);
+}
+
+#[test]
+fn test_managed_clone() {
+    let a : @int = @5i;
+    let b : @int = a.clone();
+    assert!(a == b);
+}
+
+#[test]
+fn test_managed_mut_clone() {
+    let a : @int = @5i;
+    let b : @int = a.clone();
+    assert!(a == b);
+}

src/test/run-pass/borrowck-borrow-from-expr-block.rs

@@ -1,4 +1,4 @@
-// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
+// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
 // file at the top-level directory of this distribution and at
 // http://rust-lang.org/COPYRIGHT.
 //
@@ -13,7 +13,7 @@ fn borrow(x: &int, f: &fn(x: &int)) {
 }
 
 fn test1(x: @~int) {
-    do borrow(&*x.clone()) |p| {
+    do borrow(&**x.clone()) |p| {
         let x_a = ptr::addr_of(&(**x));
         assert!((x_a as uint) != ptr::to_uint(p));
         assert!(unsafe{*x_a} == *p);